Add npm virtual repositories

# Conflicts:
#	e2e-docker/README.md
#	ui/src/components/UsageInstructions.tsx

PLAN.md

@@ -672,7 +672,7 @@ func TestMain(m *testing.M) {
 
 ```hcl
 provider "artifactapi" {
-  endpoint = "https://artifactapi.k8s.syd1.au.unkin.net"
+  endpoint = "https://artifactapi.example.com"
 }
 
 resource "artifactapi_remote" "terraform_registry" {

README.md

@@ -20,98 +20,25 @@ API: `http://localhost:8000` | Frontend: `http://localhost:5173`
 
 ## Package Types
 
-| Type | Mutable (auto-detected) | Immutable (auto-detected) |
-|---|---|---|
-| `generic` | nothing | everything |
-| `docker` | tag manifests, `/tags/list` | blobs, digest manifests |
-| `helm` | `index.yaml` | `.tgz` charts |
-| `pypi` | `simple/*` index pages | `.whl`, `.tar.gz` |
-| `npm` | package metadata | `.tgz` tarballs |
-| `rpm` | `repomd.xml`, `repodata/*` | `.rpm` |
-| `alpine` | `APKINDEX.tar.gz` | `.apk` |
-| `puppet` | `v3/modules/*`, `v3/releases*` | `.tar.gz` |
-| `terraform` | `*/versions` | `*/download/*/*` |
-| `goproxy` | `@v/list`, `@latest` | `.info`, `.mod`, `.zip` |
-| `cargo` | sparse index files (`config.json` synthesized) | `crates/*/*.crate` |
-| `nuget` | `index.json` (service index), registration and flat container indexes | `.nupkg`, `.nuspec` |
-| `github_rpm` | `repodata/*` (synthesized) | `.rpm` (redirected) |
-
 Providers classify paths automatically. Users only configure what to proxy and TTLs.
 
-### `github_rpm` — GitHub releases as a yum repo (metadata-only, no precache)
+Classification precedence, TTLs and eviction for every remote: [docs/common/caching.md](docs/common/caching.md).
 
-A `github_rpm` remote turns a GitHub repo's **releases** into a real `dnf`/`yum`
-repository without ever caching the packages. It scans releases for `.rpm`
-assets, derives each package's metadata (NEVRA, requires/provides/conflicts/
-obsoletes, files, checksum) and **synthesizes `repodata/` on the fly**. Package
-metadata comes from a **ranged GET of just the RPM header** (the header sits at
-the front of the file, so the whole package is never downloaded); the sha256
-checksum comes from the GitHub asset `digest` when present, else a one-time
-lazy stream. Derived metadata is cached (keyed by asset) so repodata generation
-is served from primed DB rows, never a cold on-demand derive.
+Each type's paths, Terraform examples and local/virtual behaviour are in `docs/<type>/`:
 
-Each package's `<location>` points back at the remote, which **302-redirects**
-the download to the `releases_remote` — an existing generic `github.com` remote
-that streams the actual bytes. `dnf` follows the redirect transparently.
-
-#### Background syncer
-
-A single process-wide **background syncer** keeps every `github_rpm` remote's
-derived metadata current off the client request path:
-
-- **Prime on create.** Creating a `github_rpm` remote enqueues a background prime
-  scan, so its metadata is derived right away without blocking the create call.
-  The first `dnf` request is served from cache. If a request arrives before the
-  prime lands, it returns a retryable `503` (with `Retry-After`) rather than
-  serving an empty repo or blocking on a multi-minute derive.
-- **Periodic re-check, driven by `mutable_ttl`.** Each remote is re-checked for
-  new or changed releases no more often than its `mutable_ttl`. New/changed
-  assets are derived incrementally; assets already cached are never re-fetched,
-  and assets that disappear upstream are pruned.
-- **ETag / 304 conditional requests.** The releases-list `ETag` is stored per
-  remote and sent as `If-None-Match`; a `304 Not Modified` means nothing changed
-  and the syncer derives nothing. GitHub does not count `304` conditional
-  responses against the rate limit, so an unchanged repo is nearly free — this is
-  the main lever keeping GitHub traffic low.
-- **Global rate limit.** Every GitHub call (releases list + each ranged asset
-  header GET) passes through a single token-bucket limiter **shared across all
-  remotes**, so GitHub is never hammered. Configure a token (`password`) on the
-  remote for the higher authenticated rate limit (~5000/hr vs ~60/hr
-  unauthenticated).
-- **Multi-replica coordination.** State is shared through the database. Before a
-  periodic scan a replica must atomically claim a per-remote lease
-  (`github_rpm_sync_state`: `last_synced_at`, `etag`, `sync_lease_owner`,
-  `sync_lease_expires`); only the winner scans. This bounds total GitHub load to
-  ~once per `mutable_ttl` regardless of replica count, and the shared `etag`
-  lets any replica issue the conditional request.
-
-```hcl
-# Backend that serves the actual .rpm bytes from github.com.
-resource "artifactapi_remote_generic" "github" {
-  name     = "github"
-  base_url = "https://github.com"
-  patterns = [
-    "acme/tools/releases/download/.*\\.rpm$", # allowlist the repo's release assets
-  ]
-}
-
-resource "artifactapi_remote_github_rpm" "acme-tools" {
-  name            = "acme-tools"
-  base_url        = "https://api.github.com/repos/acme/tools" # the releases API root
-  releases_remote = "github"                                  # backend for downloads
-  mutable_ttl     = 3600                                      # release re-scan interval
-
-  # Optional: restrict which release assets become packages (regex on filename).
-  patterns = [".*\\.x86_64\\.rpm$", ".*\\.noarch\\.rpm$"]
-
-  # Optional: a token for private repos / higher API rate limits.
-  # password = "ghp_..."
-}
-```
-
-`dnf` config: `baseurl=https://artifactapi.example/api/v1/remote/acme-tools`.
-The repo is multi-arch (no `$basearch` needed) — `dnf` selects matching packages
-from the synthesized metadata.
+- `alpine`: [remote](docs/alpine/remote.md), [remote-github](docs/alpine/remote-github.md)
+- `cargo`: [remote](docs/cargo/remote.md)
+- `deb`: [remote](docs/deb/remote.md), [remote-github](docs/deb/remote-github.md)
+- `docker`: [remote](docs/docker/remote.md), [local](docs/docker/local.md)
+- `generic`: [remote](docs/generic/remote.md)
+- `goproxy`: [remote](docs/goproxy/remote.md)
+- `helm`: [remote](docs/helm/remote.md), [local](docs/helm/local.md), [virtual](docs/helm/virtual.md)
+- `npm`: [remote](docs/npm/remote.md), [local](docs/npm/local.md), [virtual](docs/npm/virtual.md)
+- `nuget`: [remote](docs/nuget/remote.md)
+- `puppet`: [remote](docs/puppet/remote.md), [local](docs/puppet/local.md)
+- `pypi`: [remote](docs/pypi/remote.md)
+- `rpm`: [remote](docs/rpm/remote.md), [remote-github](docs/rpm/remote-github.md)
+- `terraform`: [remote](docs/terraform/remote.md), [local](docs/terraform/local.md)
 
 ### GitHub authentication
 
@@ -180,105 +107,9 @@ GITHUB_APP_PRIVATE_KEY_PATH=/etc/artifactapi/github-app.pem
 
 ## Terraform
 
-Remotes and virtuals are managed by Terraform. Each package type has its own resource:
+Remotes and virtuals are managed by Terraform. Each package type has its own resource; see `docs/<type>/` for examples.
 
-```hcl
-resource "artifactapi_remote_generic" "github" {
-  name     = "github"
-  base_url = "https://github.com"
-
-  immutable_ttl = 0
-  mutable_ttl   = 7200
-
-  patterns = [
-    "ducaale/xh/.*/xh-.*-x86_64-unknown-linux-musl.tar.gz$",
-    "mikefarah/yq/.*/yq_linux_amd64$",
-  ]
-
-  mutable_patterns = [
-    ".*/archive/refs/heads/.*\\.tar\\.gz$",
-  ]
-}
-
-resource "artifactapi_remote_docker" "dockerhub" {
-  name     = "dockerhub"
-  base_url = "https://registry-1.docker.io"
-
-  immutable_ttl    = 0
-  mutable_ttl      = 300
-  ban_tags_enabled = true
-  ban_tags         = ["latest"]
-
-  patterns = [
-    "^library/postgres",
-    "^library/redis",
-  ]
-}
-
-resource "artifactapi_remote_helm" "jetstack" {
-  name     = "jetstack"
-  base_url = "https://charts.jetstack.io"
-
-  immutable_ttl = 0
-  mutable_ttl   = 3600
-}
-
-resource "artifactapi_virtual" "helm" {
-  name         = "helm"
-  package_type = "helm"
-  members      = [artifactapi_remote_helm.jetstack.name]
-}
-```
-
-Provider: [terraform-provider-artifactapi](../terraform-provider-artifactapi)
-
-### Serving providers as a registry
-
-A local `terraform` repo is a real provider registry: upload
-`terraform-provider-{type}_{version}_{os}_{arch}.zip` files under
-`{namespace}/{type}/`, and Terraform installs them from a bare source address —
-no `.terraformrc` mirror config:
-
-```hcl
-terraform {
-  required_providers {
-    artifactapi = {
-      source  = "artifactapi.k8s.syd1.au.unkin.net/<repo>/<type>"
-      version = "0.1.2"
-    }
-  }
-}
-```
-
-The Terraform *namespace* segment is the artifactapi repo name; the provider is
-matched by *type*. The registry serves service discovery
-(`/.well-known/terraform.json`), the `providers.v1` version/download endpoints,
-and a GPG-signed `SHA256SUMS` per the provider registry protocol.
-
-Signing needs a GPG key. By default artifactapi generates one on first start and
-stores it in the database (`signing_keys` table), so every replica shares it and
-there's nothing to provision. To bring your own key instead, point
-`TF_SIGNING_KEY_PATH` at an armored private key (optionally
-`TF_SIGNING_KEY_PASSPHRASE`), which takes precedence over the generated one.
-`TF_PROVIDER_PROTOCOLS` (default `5.0,6.0`) sets the advertised plugin protocols.
-
-### Local docker registry
-
-A local `docker` repo is a real container registry, not a mirror: it serves the
-Docker Registry HTTP API V2 for both push and pull, so any client (`docker`,
-`podman`, `skopeo`, `buildah`) can use it directly.
-
-```sh
-docker tag myapp:latest artifactapi.k8s.syd1.au.unkin.net/docker-internal/myapp:latest
-docker push        artifactapi.k8s.syd1.au.unkin.net/docker-internal/myapp:latest
-docker pull        artifactapi.k8s.syd1.au.unkin.net/docker-internal/myapp:latest
-```
-
-The first path segment after `/v2/` is the artifactapi repo name; the remainder
-is the image name. Blobs and manifests are stored through the shared
-content-addressable store (deduplicated by digest, reaped by GC once
-unreferenced); tags are mutable references and re-pushing a tag moves it. Blob
-uploads support both the monolithic and chunked (`POST`/`PATCH`/`PUT`) flows.
+Provider: [terraform-provider-artifactapi](https://git.unkin.net/unkin/terraform-provider-artifactapi)
 
 ## Access Control
 
@@ -298,6 +129,7 @@ No patterns + no blocklist = open proxy. Provider handles mutability classificat
 ```
 GET /api/v1/remote/{name}/{path}     Proxy/cache artifact
 GET /api/v1/virtual/{name}/{path}    Virtual repo (merged index)
+PUT /api/v1/local/{name}/{package}   npm publish (local npm repos)
 GET /v2/{name}/{path}                Docker Registry v2
 ```
 

docs/alpine/remote-github.md

@@ -0,0 +1,7 @@
+# `github_alpine` remote
+
+Shared classification, TTL and eviction rules: [caching](../common/caching.md).
+
+| Type | Mutable (auto-detected) | Immutable (auto-detected) |
+|---|---|---|
+| `github_alpine` | `APKINDEX.tar.gz` (synthesized) | `.apk` (redirected) |

docs/alpine/remote.md

@@ -0,0 +1,7 @@
+# `alpine` remote
+
+Shared classification, TTL and eviction rules: [caching](../common/caching.md).
+
+| Type | Mutable (auto-detected) | Immutable (auto-detected) |
+|---|---|---|
+| `alpine` | `APKINDEX.tar.gz` | `.apk` |

docs/cargo/remote.md

@@ -0,0 +1,7 @@
+# `cargo` remote
+
+Shared classification, TTL and eviction rules: [caching](../common/caching.md).
+
+| Type | Mutable (auto-detected) | Immutable (auto-detected) |
+|---|---|---|
+| `cargo` | sparse index files (`config.json` synthesized) | `crates/*/*.crate` |

docs/common/caching.md

@@ -0,0 +1,100 @@
+# Caching and classification (all remotes)
+
+Every proxied request on a remote is classified as **denied**, **immutable** or
+**mutable**. The class picks the storage path and the freshness TTL.
+
+## Fields
+
+| Field | Meaning |
+|---|---|
+| `patterns` | Allowlist of regexes. Empty allows every path; otherwise a non-matching path is denied (403). |
+| `blocklist` | Regexes; a match is denied (403). |
+| `immutable_patterns` | Regexes forcing a path immutable. |
+| `mutable_patterns` | Regexes forcing a path mutable. |
+| `immutable_ttl` | Seconds an immutable path stays fresh. `0` = forever. |
+| `mutable_ttl` | Seconds a mutable path stays fresh. `0` also means never expires, and the API stores `0` when the field is omitted. |
+| `check_mutable` | Stores the upstream ETag and tries a conditional `HEAD` (`If-None-Match`) when a mutable path is fetched. The ETag expires with the `mutable_ttl` freshness key, so an expired mutable path is refetched in full, not revalidated. |
+| `stale_on_error` | On an upstream network error, serve the stored copy instead of failing. |
+| `quarantine_enabled` / `quarantine_days` | Stored on the remote but not enforced by the proxy yet. |
+| `mirrorlist` / `mirror_strategy` | rpm/deb/alpine only. Upstream pool is `[base_url] + mirrorlist`; `round_robin` (default) rotates the starting mirror, `least_conn` starts at the one with the fewest in-flight requests. Network errors and 5xx fail over to the next mirror; other statuses return as-is. |
+
+## Precedence
+
+The first rule that matches wins:
+
+1. `blocklist` matches: **denied**
+2. `patterns` is non-empty and nothing matches: **denied**
+3. `immutable_patterns` matches: **immutable**
+4. `mutable_patterns` matches: **mutable**
+5. the provider's built-in `Classify` says mutable: **mutable**
+6. anything else: **immutable**
+
+So `blocklist` beats the allowlist, and `immutable_patterns` beats
+`mutable_patterns`. Either user list overrides the built-in rules. `GET` and
+`HEAD` both apply this order.
+
+## Matching rules
+
+- Regexes are Go `regexp`, matched **unanchored** (`MatchString`). Add `^` or `$` yourself when you need them.
+- They match the path after `/api/v1/remote/<name>/`, without a leading slash, e.g. `9/BaseOS/x86_64/os/repodata/repomd.xml`.
+- The query string is not part of the path. It is dropped and not forwarded upstream.
+- `create` and `update` reject an invalid regex in `patterns`, `blocklist`, `mutable_patterns`, `immutable_patterns` or `ban_tags` with a 400. Only invalid regexes already stored before that check are skipped at match time.
+
+## Lifecycles
+
+| | Immutable | Mutable |
+|---|---|---|
+| Stored as | content-addressed blob (sha256), streamed | per-path index object, buffered and rewritten by the provider |
+| Fresh for | `immutable_ttl` (`0` = forever) | `mutable_ttl` |
+| After expiry | refetched from upstream | refetched from upstream (the ETag expires with the TTL, so `check_mutable` does not revalidate it) |
+| Upstream down | `stale_on_error` serves the stored copy and re-arms the TTL; an open circuit breaker always serves stale if a copy exists, else 503 | same |
+
+Concurrent misses on one path share a fetch lock. Waiters poll the store for
+up to 5s instead of all going upstream.
+
+## Eviction
+
+```sh
+curl -X DELETE https://artifactapi.example.com/api/v2/remotes/<name>/objects/<path>
+curl -X DELETE https://artifactapi.example.com/api/v2/remotes/<name>/objects/<dir>/*
+```
+
+- Evict drops the artifact row, the index object and the Redis TTL and ETag keys, so the next request goes upstream whatever the class or TTL.
+- A single-path evict takes the fetch lock first, so an in-flight fetch can't re-cache the path. It returns 503 if the lock stays busy.
+- A wildcard must end in `<dir>/*` and takes no lock.
+- Returns 204, or 404 for an unknown remote.
+
+## Examples
+
+Bodies for `POST https://artifactapi.example.com/api/v2/remotes`.
+
+GitHub release assets through a `generic` remote, allowlisted:
+
+```json
+{"name": "github", "package_type": "generic", "base_url": "https://github.com",
+ "immutable_ttl": 0, "mutable_ttl": 7200,
+ "patterns": ["^mikefarah/yq/releases/download/.*/yq_linux_amd64$"]}
+```
+
+rpm remote: `repodata/*` and `repomd.xml` are mutable by default, so only the TTLs are needed:
+
+```json
+{"name": "almalinux", "package_type": "rpm", "base_url": "https://repo.almalinux.org/almalinux",
+ "immutable_ttl": 0, "mutable_ttl": 3600, "check_mutable": true, "stale_on_error": true}
+```
+
+Force a moving path mutable, e.g. branch tarballs on `generic`:
+
+```json
+{"mutable_patterns": ["/archive/refs/heads/.*\\.tar\\.gz$"], "mutable_ttl": 600}
+```
+
+## Built-in classification per type
+
+Each type's page lists its auto-detected mutable and immutable paths:
+[alpine](../alpine/remote.md), [alpine github](../alpine/remote-github.md),
+[cargo](../cargo/remote.md), [deb](../deb/remote.md), [deb github](../deb/remote-github.md),
+[docker](../docker/remote.md), [generic](../generic/remote.md), [goproxy](../goproxy/remote.md),
+[helm](../helm/remote.md), [npm](../npm/remote.md), [nuget](../nuget/remote.md),
+[puppet](../puppet/remote.md), [pypi](../pypi/remote.md), [rpm](../rpm/remote.md),
+[rpm github](../rpm/remote-github.md), [terraform](../terraform/remote.md).

docs/deb/remote-github.md

@@ -0,0 +1,7 @@
+# `github_deb` remote
+
+Shared classification, TTL and eviction rules: [caching](../common/caching.md).
+
+| Type | Mutable (auto-detected) | Immutable (auto-detected) |
+|---|---|---|
+| `github_deb` | `Packages*`, `Release*` (synthesized) | `.deb` (redirected) |

docs/deb/remote.md

@@ -0,0 +1,7 @@
+# `deb` remote
+
+Shared classification, TTL and eviction rules: [caching](../common/caching.md).
+
+| Type | Mutable (auto-detected) | Immutable (auto-detected) |
+|---|---|---|
+| `deb` | `Packages*`, `Sources*`, `Release`, `InRelease`, `Release.gpg`, `Contents-*` | `.deb` |

docs/docker/local.md

@@ -0,0 +1,17 @@
+# Local docker registry
+
+A local `docker` repo is a real container registry, not a mirror: it serves the
+Docker Registry HTTP API V2 for both push and pull, so any client (`docker`,
+`podman`, `skopeo`, `buildah`) can use it directly.
+
+```sh
+docker tag myapp:latest artifactapi.example.com/docker-internal/myapp:latest
+docker push        artifactapi.example.com/docker-internal/myapp:latest
+docker pull        artifactapi.example.com/docker-internal/myapp:latest
+```
+
+The first path segment after `/v2/` is the artifactapi repo name; the remainder
+is the image name. Blobs and manifests are stored through the shared
+content-addressable store (deduplicated by digest, reaped by GC once
+unreferenced); tags are mutable references and re-pushing a tag moves it. Blob
+uploads support both the monolithic and chunked (`POST`/`PATCH`/`PUT`) flows.

docs/docker/remote.md

@@ -0,0 +1,26 @@
+# `docker` remote
+
+Shared classification, TTL and eviction rules: [caching](../common/caching.md).
+
+| Type | Mutable (auto-detected) | Immutable (auto-detected) |
+|---|---|---|
+| `docker` | tag manifests, `/tags/list` | blobs, digest manifests |
+
+## Terraform
+
+```hcl
+resource "artifactapi_remote_docker" "dockerhub" {
+  name     = "dockerhub"
+  base_url = "https://registry-1.docker.io"
+
+  immutable_ttl    = 0
+  mutable_ttl      = 300
+  ban_tags_enabled = true
+  ban_tags         = ["latest"]
+
+  patterns = [
+    "^library/postgres",
+    "^library/redis",
+  ]
+}
+```

docs/generic/remote.md

@@ -0,0 +1,28 @@
+# `generic` remote
+
+Shared classification, TTL and eviction rules: [caching](../common/caching.md).
+
+| Type | Mutable (auto-detected) | Immutable (auto-detected) |
+|---|---|---|
+| `generic` | nothing | everything |
+
+## Terraform
+
+```hcl
+resource "artifactapi_remote_generic" "github" {
+  name     = "github"
+  base_url = "https://github.com"
+
+  immutable_ttl = 0
+  mutable_ttl   = 7200
+
+  patterns = [
+    "ducaale/xh/.*/xh-.*-x86_64-unknown-linux-musl.tar.gz$",
+    "mikefarah/yq/.*/yq_linux_amd64$",
+  ]
+
+  mutable_patterns = [
+    ".*/archive/refs/heads/.*\\.tar\\.gz$",
+  ]
+}
+```

docs/goproxy/remote.md

@@ -0,0 +1,7 @@
+# `goproxy` remote
+
+Shared classification, TTL and eviction rules: [caching](../common/caching.md).
+
+| Type | Mutable (auto-detected) | Immutable (auto-detected) |
+|---|---|---|
+| `goproxy` | `@v/list`, `@latest` | `.info`, `.mod`, `.zip` |

docs/helm/local.md

@@ -0,0 +1,15 @@
+# Local helm repository
+
+A local `helm` repo is a real chart repository: `PUT` a packaged chart to
+`/api/v2/remotes/<repo>/files/<chart>-<version>.tgz` and `index.yaml` is
+generated from each chart's `Chart.yaml` (with sha256 digests) at
+`/api/v1/local/<repo>/index.yaml`; a file not named after its `Chart.yaml`
+name and version is stored but left out of the index. Add the local as a
+member of a helm virtual to serve it alongside remotes.
+
+```bash
+helm package ./mychart
+curl -fsSL --upload-file mychart-0.1.0.tgz \
+  https://artifactapi.example.com/api/v2/remotes/<repo>/files/mychart-0.1.0.tgz
+helm repo add <repo> https://artifactapi.example.com/api/v1/local/<repo>
+```

docs/helm/remote.md

@@ -0,0 +1,19 @@
+# `helm` remote
+
+Shared classification, TTL and eviction rules: [caching](../common/caching.md).
+
+| Type | Mutable (auto-detected) | Immutable (auto-detected) |
+|---|---|---|
+| `helm` | `index.yaml` | `.tgz` charts |
+
+## Terraform
+
+```hcl
+resource "artifactapi_remote_helm" "jetstack" {
+  name     = "jetstack"
+  base_url = "https://charts.jetstack.io"
+
+  immutable_ttl = 0
+  mutable_ttl   = 3600
+}
+```

docs/helm/virtual.md

@@ -0,0 +1,9 @@
+# `helm` virtual
+
+```hcl
+resource "artifactapi_virtual" "helm" {
+  name         = "helm"
+  package_type = "helm"
+  members      = [artifactapi_remote_helm.jetstack.name]
+}
+```

docs/npm/local.md

@@ -0,0 +1,14 @@
+# Local npm registry
+
+A local `npm` repo is a real npm registry: `npm publish` (scoped and unscoped)
+and `npm install` work against `/api/v1/local/<repo>/`. npm requires an
+`_authToken` for the registry before it will publish; any value works.
+
+```ini
+# .npmrc
+registry=https://artifactapi.example.com/api/v1/local/<repo>/
+//artifactapi.example.com/api/v1/local/<repo>/:_authToken=unused
+```
+
+Versions are immutable: republishing an existing version is rejected. The
+dist-tags sent with a publish (`latest`, or `--tag`) move to that version.

docs/npm/remote.md

@@ -0,0 +1,7 @@
+# `npm` remote
+
+Shared classification, TTL and eviction rules: [caching](../common/caching.md).
+
+| Type | Mutable (auto-detected) | Immutable (auto-detected) |
+|---|---|---|
+| `npm` | package metadata | `.tgz` tarballs |

docs/npm/virtual.md

@@ -0,0 +1,30 @@
+# `npm` virtual
+
+An npm virtual serves one registry over local and remote npm members:
+`npm install` and `npm view` work against `/api/v1/virtual/<name>/`.
+
+- Versions are the union across members; on a duplicate version the earlier
+  member wins.
+- Each dist-tag comes from the first member defining it, and is dropped if it
+  names a version missing from the merged set.
+- Tarball URLs point at the virtual (`<member>/<path>`), which 302s to the
+  owning member.
+- Full and abbreviated (`application/vnd.npm.install-v1+json`) packuments are
+  both served.
+- A member error fails the request with 502; a member without the package is
+  skipped. Merges are cached for 60s per package.
+
+```hcl
+resource "artifactapi_virtual" "npm" {
+  name         = "npm"
+  package_type = "npm"
+  members      = [artifactapi_local_npm.internal.name, artifactapi_remote_npm.npmjs.name]
+}
+```
+
+```ini
+# .npmrc
+registry=https://artifactapi.example.com/api/v1/virtual/npm/
+```
+
+Publish to the local member directly; the virtual is read-only.

docs/nuget/remote.md

@@ -0,0 +1,7 @@
+# `nuget` remote
+
+Shared classification, TTL and eviction rules: [caching](../common/caching.md).
+
+| Type | Mutable (auto-detected) | Immutable (auto-detected) |
+|---|---|---|
+| `nuget` | `index.json` (service index), registration and flat container indexes | `.nupkg`, `.nuspec` |

docs/puppet/local.md

@@ -0,0 +1,14 @@
+# Local puppet forge
+
+A local `puppet` repo is a Forge: `PUT` a module tarball to
+`/api/v2/remotes/<repo>/files/<owner>-<module>-<version>.tar.gz` and the Forge
+v3 API (`/v3/modules`, `/v3/releases`, `/v3/files`) is served from each
+release's `metadata.json` at `/api/v1/local/<repo>`. Versions are immutable.
+
+```bash
+puppet module build ./hello
+curl -fsSL --upload-file pkg/unkin-hello-0.1.0.tar.gz \
+  https://artifactapi.example.com/api/v2/remotes/<repo>/files/unkin-hello-0.1.0.tar.gz
+puppet module install unkin-hello \
+  --module_repository https://artifactapi.example.com/api/v1/local/<repo>
+```

docs/puppet/remote.md

@@ -0,0 +1,7 @@
+# `puppet` remote
+
+Shared classification, TTL and eviction rules: [caching](../common/caching.md).
+
+| Type | Mutable (auto-detected) | Immutable (auto-detected) |
+|---|---|---|
+| `puppet` | `v3/modules/*`, `v3/releases*` | `.tar.gz` |

docs/pypi/remote.md

@@ -0,0 +1,7 @@
+# `pypi` remote
+
+Shared classification, TTL and eviction rules: [caching](../common/caching.md).
+
+| Type | Mutable (auto-detected) | Immutable (auto-detected) |
+|---|---|---|
+| `pypi` | `simple/*` index pages | `.whl`, `.tar.gz` |

docs/rpm/remote-github.md

@@ -0,0 +1,82 @@
+# `github_rpm` remote
+
+Shared classification, TTL and eviction rules: [caching](../common/caching.md).
+
+| Type | Mutable (auto-detected) | Immutable (auto-detected) |
+|---|---|---|
+| `github_rpm` | `repodata/*` (synthesized) | `.rpm` (redirected) |
+
+## GitHub releases as a yum repo (metadata-only, no precache)
+
+A `github_rpm` remote turns a GitHub repo's **releases** into a real `dnf`/`yum`
+repository without ever caching the packages. It scans releases for `.rpm`
+assets, derives each package's metadata (NEVRA, requires/provides/conflicts/
+obsoletes, files, checksum) and **synthesizes `repodata/` on the fly**. Package
+metadata comes from a **ranged GET of just the RPM header** (the header sits at
+the front of the file, so the whole package is never downloaded); the sha256
+checksum comes from the GitHub asset `digest` when present, else a one-time
+lazy stream. Derived metadata is cached (keyed by asset) so repodata generation
+is served from primed DB rows, never a cold on-demand derive.
+
+Each package's `<location>` points back at the remote, which **302-redirects**
+the download to the `releases_remote` — an existing generic `github.com` remote
+that streams the actual bytes. `dnf` follows the redirect transparently.
+
+### Background syncer
+
+A single process-wide **background syncer** keeps every `github_rpm` remote's
+derived metadata current off the client request path:
+
+- **Prime on create.** Creating a `github_rpm` remote enqueues a background prime
+  scan, so its metadata is derived right away without blocking the create call.
+  The first `dnf` request is served from cache. If a request arrives before the
+  prime lands, it returns a retryable `503` (with `Retry-After`) rather than
+  serving an empty repo or blocking on a multi-minute derive.
+- **Periodic re-check, driven by `mutable_ttl`.** Each remote is re-checked for
+  new or changed releases no more often than its `mutable_ttl`. New/changed
+  assets are derived incrementally; assets already cached are never re-fetched,
+  and assets that disappear upstream are pruned.
+- **ETag / 304 conditional requests.** The releases-list `ETag` is stored per
+  remote and sent as `If-None-Match`; a `304 Not Modified` means nothing changed
+  and the syncer derives nothing. GitHub does not count `304` conditional
+  responses against the rate limit, so an unchanged repo is nearly free — this is
+  the main lever keeping GitHub traffic low.
+- **Global rate limit.** Every GitHub call (releases list + each ranged asset
+  header GET) passes through a single token-bucket limiter **shared across all
+  remotes**, so GitHub is never hammered. Configure a token (`password`) on the
+  remote for the higher authenticated rate limit (~5000/hr vs ~60/hr
+  unauthenticated).
+- **Multi-replica coordination.** State is shared through the database. Before a
+  periodic scan a replica must atomically claim a per-remote lease
+  (`github_rpm_sync_state`: `last_synced_at`, `etag`, `sync_lease_owner`,
+  `sync_lease_expires`); only the winner scans. This bounds total GitHub load to
+  ~once per `mutable_ttl` regardless of replica count, and the shared `etag`
+  lets any replica issue the conditional request.
+
+```hcl
+# Backend that serves the actual .rpm bytes from github.com.
+resource "artifactapi_remote_generic" "github" {
+  name     = "github"
+  base_url = "https://github.com"
+  patterns = [
+    "acme/tools/releases/download/.*\\.rpm$", # allowlist the repo's release assets
+  ]
+}
+
+resource "artifactapi_remote_github_rpm" "acme-tools" {
+  name            = "acme-tools"
+  base_url        = "https://api.github.com/repos/acme/tools" # the releases API root
+  releases_remote = "github"                                  # backend for downloads
+  mutable_ttl     = 3600                                      # release re-scan interval
+
+  # Optional: restrict which release assets become packages (regex on filename).
+  patterns = [".*\\.x86_64\\.rpm$", ".*\\.noarch\\.rpm$"]
+
+  # Optional: a token for private repos / higher API rate limits.
+  # password = "ghp_..."
+}
+```
+
+`dnf` config: `baseurl=https://artifactapi.example/api/v1/remote/acme-tools`.
+The repo is multi-arch (no `$basearch` needed) — `dnf` selects matching packages
+from the synthesized metadata.

docs/rpm/remote.md

@@ -0,0 +1,7 @@
+# `rpm` remote
+
+Shared classification, TTL and eviction rules: [caching](../common/caching.md).
+
+| Type | Mutable (auto-detected) | Immutable (auto-detected) |
+|---|---|---|
+| `rpm` | `repomd.xml`, `repodata/*` | `.rpm` |

docs/terraform/local.md

@@ -0,0 +1,29 @@
+# Serving providers as a registry
+
+A local `terraform` repo is a real provider registry: upload
+`terraform-provider-{type}_{version}_{os}_{arch}.zip` files under
+`{namespace}/{type}/`, and Terraform installs them from a bare source address —
+no `.terraformrc` mirror config:
+
+```hcl
+terraform {
+  required_providers {
+    artifactapi = {
+      source  = "artifactapi.example.com/<repo>/<type>"
+      version = "0.1.2"
+    }
+  }
+}
+```
+
+The Terraform *namespace* segment is the artifactapi repo name; the provider is
+matched by *type*. The registry serves service discovery
+(`/.well-known/terraform.json`), the `providers.v1` version/download endpoints,
+and a GPG-signed `SHA256SUMS` per the provider registry protocol.
+
+Signing needs a GPG key. By default artifactapi generates one on first start and
+stores it in the database (`signing_keys` table), so every replica shares it and
+there's nothing to provision. To bring your own key instead, point
+`TF_SIGNING_KEY_PATH` at an armored private key (optionally
+`TF_SIGNING_KEY_PASSPHRASE`), which takes precedence over the generated one.
+`TF_PROVIDER_PROTOCOLS` (default `5.0,6.0`) sets the advertised plugin protocols.

docs/terraform/remote.md

@@ -0,0 +1,7 @@
+# `terraform` remote
+
+Shared classification, TTL and eviction rules: [caching](../common/caching.md).
+
+| Type | Mutable (auto-detected) | Immutable (auto-detected) |
+|---|---|---|
+| `terraform` | `*/versions` | `*/download/*/*` |

e2e-docker/README.md

@@ -22,14 +22,17 @@ already-running stack.
 ## Coverage
 
 - **Repository lifecycle** — add / change / delete for remote, local and virtual repos.
-- **Caching** — one immutable artifact per remote package type (generic, docker,
-  helm, pypi, npm, rpm, alpine, puppet, terraform, goproxy, cargo, nuget) proxied through the
-  mock upstream: first fetch `X-Artifact-Source: remote`, second `cache`, bytes
+- **Caching** — one immutable artifact per remote package type (one
+  `caching_<type>_test.go` case each) proxied through the mock upstream: first fetch `X-Artifact-Source: remote`, second `cache`, bytes
   verified against the origin fixture.
-- **Local uploads** — generic (upload/download), pypi (wheel + generated `simple/`
-  index), rpm (real package + **automatic repodata** generation).
+- **Local uploads** — puppet (Forge v3 API via real `r10k` and `puppet module install`),
+  generic (upload/download), pypi (wheel + generated `simple/`
+  index), rpm (real package + **automatic repodata** generation), npm (stock
+  `node:22` client: `npm publish` unscoped + scoped, `npm install` + `require()`,
+  second version, republish rejected).
 - **Virtual repositories** — pypi simple-index merge and helm `index.yaml` merge
-  across two members.
+  across two members; npm packument merge over two locals via a stock `node:22`
+  client (merged versions, install through the member redirect).
 - **Mirrorlist** — an rpm remote with a `mirrorlist` of extra upstream mirrors
   (pool = `base_url` + `mirrorlist`): round-robin distribution across both mirrors
   (constant-body `mockupstreama` / `mockupstreamb`), failover past a dead primary,

e2e-docker/caching_alpine_test.go

@@ -0,0 +1,7 @@
+//go:build dockere2e
+
+package e2edocker
+
+func init() {
+	cachingCases = append(cachingCases, cachingCase{"alpine", "alpine/x86_64/testpkg-1.0-r0.apk", "alpine/x86_64/testpkg-1.0-r0.apk"})
+}

e2e-docker/caching_cargo_test.go

@@ -0,0 +1,7 @@
+//go:build dockere2e
+
+package e2edocker
+
+func init() {
+	cachingCases = append(cachingCases, cachingCase{"cargo", "crates/mycrate/mycrate-1.0.0.crate", "crates/mycrate/mycrate-1.0.0.crate"})
+}

e2e-docker/caching_docker_test.go

@@ -0,0 +1,7 @@
+//go:build dockere2e
+
+package e2edocker
+
+func init() {
+	cachingCases = append(cachingCases, cachingCase{"docker", "library/testimg/blobs/blobdata", "v2/library/testimg/blobs/blobdata"})
+}

e2e-docker/caching_generic_test.go

@@ -0,0 +1,7 @@
+//go:build dockere2e
+
+package e2edocker
+
+func init() {
+	cachingCases = append(cachingCases, cachingCase{"generic", "blobs/hello.bin", "blobs/hello.bin"})
+}

e2e-docker/caching_goproxy_test.go

@@ -0,0 +1,7 @@
+//go:build dockere2e
+
+package e2edocker
+
+func init() {
+	cachingCases = append(cachingCases, cachingCase{"goproxy", "goproxy/example.com/mod/@v/v1.0.0.zip", "goproxy/example.com/mod/@v/v1.0.0.zip"})
+}

e2e-docker/caching_helm_test.go

@@ -0,0 +1,7 @@
+//go:build dockere2e
+
+package e2edocker
+
+func init() {
+	cachingCases = append(cachingCases, cachingCase{"helm", "charts/mychart-1.0.0.tgz", "charts/mychart-1.0.0.tgz"})
+}

e2e-docker/caching_npm_test.go

@@ -0,0 +1,7 @@
+//go:build dockere2e
+
+package e2edocker
+
+func init() {
+	cachingCases = append(cachingCases, cachingCase{"npm", "mypkg/-/mypkg-1.0.0.tgz", "mypkg/-/mypkg-1.0.0.tgz"})
+}

e2e-docker/caching_nuget_test.go

@@ -0,0 +1,7 @@
+//go:build dockere2e
+
+package e2edocker
+
+func init() {
+	cachingCases = append(cachingCases, cachingCase{"nuget", "nuget/e2epkg/1.0.0/e2epkg.1.0.0.nupkg", "nuget/e2epkg/1.0.0/e2epkg.1.0.0.nupkg"})
+}

e2e-docker/caching_puppet_test.go

@@ -0,0 +1,7 @@
+//go:build dockere2e
+
+package e2edocker
+
+func init() {
+	cachingCases = append(cachingCases, cachingCase{"puppet", "puppet-releases/author-mod-1.0.0.tar.gz", "puppet-releases/author-mod-1.0.0.tar.gz"})
+}

e2e-docker/caching_pypi_test.go

@@ -0,0 +1,7 @@
+//go:build dockere2e
+
+package e2edocker
+
+func init() {
+	cachingCases = append(cachingCases, cachingCase{"pypi", "packages/foo-1.0-py3-none-any.whl", "packages/foo-1.0-py3-none-any.whl"})
+}

e2e-docker/caching_rpm_test.go

@@ -0,0 +1,7 @@
+//go:build dockere2e
+
+package e2edocker
+
+func init() {
+	cachingCases = append(cachingCases, cachingCase{"rpm", "rpmrepo/Packages/e2e-testpkg-1.0-1.noarch.rpm", "rpmrepo/Packages/e2e-testpkg-1.0-1.noarch.rpm"})
+}

e2e-docker/caching_terraform_test.go

@@ -0,0 +1,7 @@
+//go:build dockere2e
+
+package e2edocker
+
+func init() {
+	cachingCases = append(cachingCases, cachingCase{"terraform", "hashicorp/aws/download/pkg.zip", "v1/providers/hashicorp/aws/download/pkg.zip"})
+}

e2e-docker/caching_test.go

@@ -9,33 +9,23 @@ import (
 	"testing"
 )
 
+type cachingCase struct {
+	pkgType string
+	// path is the request path under /api/v1/remote/<name>/. The provider
+	// derives the upstream URL from it (docker prepends /v2/, terraform
+	// prepends /v1/providers/), and the fixture lives at that resolved path.
+	path    string
+	fixture string
+}
+
+// cachingCases is filled by one caching_<type>_test.go file per package type.
+var cachingCases []cachingCase
+
 // TestCachingPerProvider proxies one immutable artifact for every remote
 // package type through the mock upstream and asserts: first fetch is served
 // from the remote, the second from cache, and the bytes match the origin.
 func TestCachingPerProvider(t *testing.T) {
-	cases := []struct {
-		pkgType string
-		// path is the request path under /api/v1/remote/<name>/. The provider
-		// derives the upstream URL from it (docker prepends /v2/, terraform
-		// prepends /v1/providers/), and the fixture lives at that resolved path.
-		path    string
-		fixture string
-	}{
-		{"generic", "blobs/hello.bin", "blobs/hello.bin"},
-		{"npm", "mypkg/-/mypkg-1.0.0.tgz", "mypkg/-/mypkg-1.0.0.tgz"},
-		{"helm", "charts/mychart-1.0.0.tgz", "charts/mychart-1.0.0.tgz"},
-		{"pypi", "packages/foo-1.0-py3-none-any.whl", "packages/foo-1.0-py3-none-any.whl"},
-		{"rpm", "rpmrepo/Packages/e2e-testpkg-1.0-1.noarch.rpm", "rpmrepo/Packages/e2e-testpkg-1.0-1.noarch.rpm"},
-		{"alpine", "alpine/x86_64/testpkg-1.0-r0.apk", "alpine/x86_64/testpkg-1.0-r0.apk"},
-		{"puppet", "puppet-releases/author-mod-1.0.0.tar.gz", "puppet-releases/author-mod-1.0.0.tar.gz"},
-		{"goproxy", "goproxy/example.com/mod/@v/v1.0.0.zip", "goproxy/example.com/mod/@v/v1.0.0.zip"},
-		{"cargo", "crates/mycrate/mycrate-1.0.0.crate", "crates/mycrate/mycrate-1.0.0.crate"},
-		{"nuget", "nuget/e2epkg/1.0.0/e2epkg.1.0.0.nupkg", "nuget/e2epkg/1.0.0/e2epkg.1.0.0.nupkg"},
-		{"terraform", "hashicorp/aws/download/pkg.zip", "v1/providers/hashicorp/aws/download/pkg.zip"},
-		{"docker", "library/testimg/blobs/blobdata", "v2/library/testimg/blobs/blobdata"},
-	}
-
-	for _, tc := range cases {
+	for _, tc := range cachingCases {
 		t.Run(tc.pkgType, func(t *testing.T) {
 			name := "cache-" + tc.pkgType
 			createRepo(t, fmt.Sprintf(`{

e2e-docker/helm_local_test.go

@@ -0,0 +1,71 @@
+//go:build dockere2e
+
+package e2edocker
+
+import (
+	"net/http"
+	"os"
+	"os/exec"
+	"strings"
+	"testing"
+	"time"
+)
+
+// TestLocalHelmRealClient packages a chart with the real helm CLI, publishes it
+// to a helm local, then drives helm repo add/search/pull/template against the
+// local and against a helm virtual that has the local as a member.
+func TestLocalHelmRealClient(t *testing.T) {
+	network := os.Getenv("COMPOSE_NETWORK")
+	internal := strings.TrimRight(os.Getenv("ARTIFACTAPI_INTERNAL"), "/")
+	if network == "" || internal == "" {
+		t.Skip("COMPOSE_NETWORK/ARTIFACTAPI_INTERNAL not set; run via scripts/docker-e2e.sh")
+	}
+	if _, err := exec.LookPath("docker"); err != nil {
+		t.Skip("docker not available on the test host")
+	}
+
+	createRepo(t, `{"name":"local-helm","package_type":"helm","repo_type":"local"}`)
+	defer deleteRepo(t, "local-helm")
+	createVirtual(t, `{"name":"vhelm","package_type":"helm","members":["local-helm"]}`)
+	defer deleteVirtual(t, "vhelm")
+
+	helm := func(script string) string {
+		t.Helper()
+		out, err := exec.Command("docker", "run", "--rm", "--network", network, "--entrypoint", "sh",
+			"alpine/helm:3.16.4", "-c", "set -eu; "+script).Output()
+		if err != nil {
+			stderr := ""
+			if ee, ok := err.(*exec.ExitError); ok {
+				stderr = string(ee.Stderr)
+			}
+			t.Fatalf("helm script failed: %v\n%s%s", err, out, stderr)
+		}
+		return string(out)
+	}
+
+	chart := helm("cd /tmp && helm create e2echart >/dev/null && helm package e2echart >/dev/null && cat e2echart-0.1.0.tgz")
+	uploadFile(t, "local-helm", "e2echart-0.1.0.tgz", []byte(chart), "application/gzip")
+
+	// Chart metadata is recorded asynchronously after upload; poll the index.
+	var body []byte
+	for deadline := time.Now().Add(15 * time.Second); time.Now().Before(deadline); time.Sleep(500 * time.Millisecond) {
+		var resp *http.Response
+		resp, body = doRequest(t, http.MethodGet, api("/api/v1/local/local-helm/index.yaml"), nil, "")
+		if resp.StatusCode == http.StatusOK && strings.Contains(string(body), "e2echart-0.1.0.tgz") {
+			break
+		}
+	}
+	if !strings.Contains(string(body), "e2echart-0.1.0.tgz") || !strings.Contains(string(body), "digest: ") {
+		t.Fatalf("index.yaml never listed the chart:\n%s", body)
+	}
+
+	for _, repoURL := range []string{internal + "/api/v1/local/local-helm", internal + "/api/v1/virtual/vhelm"} {
+		out := helm("helm repo add e2e " + repoURL + " >/dev/null && " +
+			"helm search repo e2e/e2echart && " +
+			"cd /tmp && helm pull e2e/e2echart --version 0.1.0 && " +
+			"helm template rel e2echart-0.1.0.tgz | grep -c 'kind: Deployment'")
+		if !strings.Contains(out, "e2e/e2echart") || !strings.Contains(out, "0.1.0") || !strings.HasSuffix(strings.TrimSpace(out), "1") {
+			t.Fatalf("helm via %s:\n%s", repoURL, out)
+		}
+	}
+}

e2e-docker/npm_local_test.go

@@ -0,0 +1,62 @@
+//go:build dockere2e
+
+package e2edocker
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"strings"
+	"testing"
+	"time"
+)
+
+// TestLocalNPMPublishInstall drives a stock npm client against a local npm
+// repo: publish unscoped and scoped packages, install and require() them in a
+// fresh project, publish a second version, and reject a republish.
+func TestLocalNPMPublishInstall(t *testing.T) {
+	network := os.Getenv("COMPOSE_NETWORK")
+	internal := os.Getenv("ARTIFACTAPI_INTERNAL")
+	if network == "" || internal == "" {
+		t.Skip("COMPOSE_NETWORK/ARTIFACTAPI_INTERNAL not set; run via scripts/docker-e2e.sh")
+	}
+	if _, err := exec.LookPath("docker"); err != nil {
+		t.Skip("docker not available on the test host")
+	}
+
+	name := fmt.Sprintf("e2e-npm-local-%d", time.Now().UnixNano())
+	createRepo(t, fmt.Sprintf(`{"name":%q,"package_type":"npm","repo_type":"local"}`, name))
+	defer deleteRepo(t, name)
+
+	reg := strings.TrimRight(internal, "/") + "/api/v1/local/" + name + "/"
+	script := `set -euo pipefail
+printf 'registry=%s\n%s:_authToken=unused\n' "$REG" "${REG#http:}" > ~/.npmrc
+mk() { d="/w/src/$1-$2"; mkdir -p "$d"; cd "$d"
+  printf '{"name":"%s","version":"%s","main":"index.js"}' "$1" "$2" > package.json
+  echo "module.exports = '$1@$2';" > index.js; }
+mk e2e-npm-plain 1.0.0 && npm publish
+mk @e2e/npm-scoped 1.0.0 && npm publish
+mk e2e-npm-plain 1.0.0
+if npm publish 2>/dev/null; then echo "republish accepted"; exit 1; fi
+mkdir -p /w/app && cd /w/app && npm init -y >/dev/null
+npm install --no-audit --cache /tmp/fresh-cache e2e-npm-plain @e2e/npm-scoped
+node -e "console.log('REQ', require('e2e-npm-plain'), require('@e2e/npm-scoped'))"
+mk e2e-npm-plain 1.1.0 && npm publish
+echo "VERSIONS $(npm view e2e-npm-plain versions --json | tr -d ' \n')"
+echo "LATEST $(npm view e2e-npm-plain dist-tags.latest)"`
+
+	out, err := exec.Command("docker", "run", "--rm", "--network", network,
+		"-e", "REG="+reg, "node:22", "bash", "-c", script).CombinedOutput()
+	if err != nil {
+		t.Fatalf("npm client run failed: %v\n%s", err, out)
+	}
+	for _, want := range []string{
+		"REQ e2e-npm-plain@1.0.0 @e2e/npm-scoped@1.0.0",
+		`VERSIONS ["1.0.0","1.1.0"]`,
+		"LATEST 1.1.0",
+	} {
+		if !strings.Contains(string(out), want) {
+			t.Fatalf("missing %q in npm output:\n%s", want, out)
+		}
+	}
+}

e2e-docker/npm_virtual_test.go

@@ -0,0 +1,68 @@
+//go:build dockere2e
+
+package e2edocker
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"strings"
+	"testing"
+	"time"
+)
+
+// TestVirtualNPMInstall publishes to two local npm repos and drives a stock
+// npm client through a virtual over both: merged versions and dist-tags, and
+// an install whose tarballs resolve via the virtual's member redirect.
+func TestVirtualNPMInstall(t *testing.T) {
+	network := os.Getenv("COMPOSE_NETWORK")
+	internal := os.Getenv("ARTIFACTAPI_INTERNAL")
+	if network == "" || internal == "" {
+		t.Skip("COMPOSE_NETWORK/ARTIFACTAPI_INTERNAL not set; run via scripts/docker-e2e.sh")
+	}
+	if _, err := exec.LookPath("docker"); err != nil {
+		t.Skip("docker not available on the test host")
+	}
+
+	id := time.Now().UnixNano()
+	a, b, virt := fmt.Sprintf("e2e-npm-a-%d", id), fmt.Sprintf("e2e-npm-b-%d", id), fmt.Sprintf("e2e-npm-v-%d", id)
+	for _, name := range []string{a, b} {
+		createRepo(t, fmt.Sprintf(`{"name":%q,"package_type":"npm","repo_type":"local"}`, name))
+		defer deleteRepo(t, name)
+	}
+	createVirtual(t, fmt.Sprintf(`{"name":%q,"package_type":"npm","members":[%q,%q]}`, virt, a, b))
+	defer deleteVirtual(t, virt)
+
+	base := strings.TrimRight(internal, "/")
+	script := `set -euo pipefail
+pub() { d="/w/src/$2-$3-$1"; mkdir -p "$d"; cd "$d"
+  printf '{"name":"%s","version":"%s","main":"index.js"}' "$2" "$3" > package.json
+  echo "module.exports = '$1:$2@$3';" > index.js
+  printf 'registry=%s\n%s:_authToken=unused\n' "$BASE/api/v1/local/$1/" "${BASE#http:}/api/v1/local/$1/" > .npmrc
+  npm publish; }
+pub "$A" @e2e/virt 1.0.0
+pub "$B" @e2e/virt 1.0.0
+pub "$B" @e2e/virt 1.1.0
+mkdir -p /w/app && cd /w/app && npm init -y >/dev/null
+echo "registry=$BASE/api/v1/virtual/$V/" > .npmrc
+echo "VERSIONS $(npm view @e2e/virt versions --json | tr -d ' \n')"
+npm install --no-audit --cache /tmp/fresh-cache @e2e/virt@1.0.0
+node -e "console.log('REQ', require('@e2e/virt'))"
+echo "RESOLVED $(node -p "require('./package-lock.json').packages['node_modules/@e2e/virt'].resolved")"`
+
+	out, err := exec.Command("docker", "run", "--rm", "--network", network,
+		"-e", "BASE="+base, "-e", "A="+a, "-e", "B="+b, "-e", "V="+virt,
+		"node:22", "bash", "-c", script).CombinedOutput()
+	if err != nil {
+		t.Fatalf("npm client run failed: %v\n%s", err, out)
+	}
+	for _, want := range []string{
+		`VERSIONS ["1.0.0","1.1.0"]`,
+		"REQ " + a + ":@e2e/virt@1.0.0",
+		"RESOLVED " + base + "/api/v1/virtual/" + virt + "/" + a + "/@e2e/virt/-/virt-1.0.0.tgz",
+	} {
+		if !strings.Contains(string(out), want) {
+			t.Fatalf("missing %q in npm output:\n%s", want, out)
+		}
+	}
+}

e2e-docker/puppet_local_test.go

@@ -0,0 +1,88 @@
+//go:build dockere2e
+
+package e2edocker
+
+import (
+	"archive/tar"
+	"bytes"
+	"compress/gzip"
+	"net/http"
+	"os"
+	"os/exec"
+	"strings"
+	"testing"
+	"time"
+)
+
+const puppetHelloMetadata = `{"name":"unkin-hello","version":"0.1.0","author":"unkin","summary":"e2e","license":"Apache-2.0","source":"https://example.invalid","dependencies":[{"name":"puppetlabs/stdlib","version_requirement":">= 4.0.0 < 10.0.0"}]}`
+
+func puppetModuleTarball(t *testing.T) []byte {
+	t.Helper()
+	var buf bytes.Buffer
+	zw := gzip.NewWriter(&buf)
+	tw := tar.NewWriter(zw)
+	for name, body := range map[string]string{
+		"unkin-hello-0.1.0/metadata.json":     puppetHelloMetadata,
+		"unkin-hello-0.1.0/manifests/init.pp": "class hello {}\n",
+	} {
+		if err := tw.WriteHeader(&tar.Header{Name: name, Mode: 0o644, Size: int64(len(body)), ModTime: time.Now()}); err != nil {
+			t.Fatal(err)
+		}
+		_, _ = tw.Write([]byte(body))
+	}
+	_ = tw.Close()
+	_ = zw.Close()
+	return buf.Bytes()
+}
+
+// TestLocalPuppetRealClient publishes a module to a puppet local and installs
+// it with the real r10k and puppet module tool. The stdlib dependency is not on
+// a local-only forge, so puppet runs with --ignore-dependencies.
+func TestLocalPuppetRealClient(t *testing.T) {
+	network := os.Getenv("COMPOSE_NETWORK")
+	internal := strings.TrimRight(os.Getenv("ARTIFACTAPI_INTERNAL"), "/")
+	if network == "" || internal == "" {
+		t.Skip("COMPOSE_NETWORK/ARTIFACTAPI_INTERNAL not set; run via scripts/docker-e2e.sh")
+	}
+	if _, err := exec.LookPath("docker"); err != nil {
+		t.Skip("docker not available on the test host")
+	}
+
+	createRepo(t, `{"name":"local-puppet","package_type":"puppet","repo_type":"local"}`)
+	defer deleteRepo(t, "local-puppet")
+
+	upload := api("/api/v2/remotes/local-puppet/files/unkin-hello-0.1.0.tar.gz")
+	defer doRequest(t, http.MethodDelete, api("/api/v2/remotes/local-puppet/files/v3/files/unkin-hello-0.1.0.tar.gz"), nil, "")
+	tarball := puppetModuleTarball(t)
+	if resp, body := doRequest(t, http.MethodPut, upload, tarball, "application/gzip"); resp.StatusCode != http.StatusCreated {
+		t.Fatalf("upload: %d %s", resp.StatusCode, body)
+	}
+	if resp, _ := doRequest(t, http.MethodPut, upload, tarball, "application/gzip"); resp.StatusCode != http.StatusConflict {
+		t.Fatalf("re-upload of an existing version: %d, want 409", resp.StatusCode)
+	}
+	if resp, body := getEventually(t, api("/api/v1/local/local-puppet/v3/releases/unkin-hello-0.1.0"), 15*time.Second); resp.StatusCode != http.StatusOK || !strings.Contains(string(body), `"file_md5"`) {
+		t.Fatalf("release never indexed: %d %s", resp.StatusCode, body)
+	}
+
+	forge := internal + "/api/v1/local/local-puppet"
+	run := func(image, script string) string {
+		t.Helper()
+		out, err := exec.Command("docker", "run", "--rm", "--network", network, "--entrypoint", "sh", image, "-c", "set -eu; "+script).CombinedOutput()
+		if err != nil {
+			t.Fatalf("%s failed: %v\n%s", image, err, out)
+		}
+		return string(out)
+	}
+
+	out := run("ghcr.io/voxpupuli/r10k:latest", "cd /tmp && printf 'forge:\\n  baseurl: "+forge+"\\n' > r10k.yaml && "+
+		"printf \"forge '"+forge+"'\\nmod 'unkin-hello', '0.1.0'\\n\" > Puppetfile && "+
+		"r10k puppetfile install -c r10k.yaml --verbose && cat modules/hello/metadata.json")
+	if !strings.Contains(out, `"unkin-hello"`) {
+		t.Fatalf("r10k did not install unkin-hello:\n%s", out)
+	}
+
+	out = run("ghcr.io/openvoxproject/openvoxagent:latest", "export PATH=/opt/puppetlabs/bin:$PATH; puppet module install unkin-hello --module_repository "+forge+" --ignore-dependencies --target-dir /tmp/mods && puppet module list --color=false --modulepath /tmp/mods")
+	if !strings.Contains(out, "unkin-hello (v0.1.0)") {
+		t.Fatalf("puppet module install did not install unkin-hello:\n%s", out)
+	}
+}

e2e-docker/virtual_test.go

@@ -14,8 +14,6 @@ import (
 	"strings"
 	"testing"
 	"time"
-
-	"git.unkin.net/unkin/artifactapi/internal/testsupport"
 )
 
 // TestVirtualPyPIMerge uploads different packages to two pypi locals and
@@ -138,104 +136,3 @@ func TestVirtualRPMMerge(t *testing.T) {
 		t.Fatalf("real dnf against rpm virtual failed: %v\n%s", err, out)
 	}
 }
-
-// TestVirtualDebMerge merges two local deb repos carrying the same package: the
-// first member wins the duplicate, and a real apt sees both members' packages
-// and installs through the virtual.
-func TestVirtualDebMerge(t *testing.T) {
-	createRepo(t, `{"name":"vdeb-a","package_type":"deb","repo_type":"local"}`)
-	createRepo(t, `{"name":"vdeb-b","package_type":"deb","repo_type":"local"}`)
-	defer deleteRepo(t, "vdeb-a")
-	defer deleteRepo(t, "vdeb-b")
-
-	uploadFile(t, "vdeb-a", "vdeb-one_1.0.0_amd64.deb", testsupport.MinimalDeb("vdeb-one", "1.0.0", "amd64"), "application/vnd.debian.binary-package")
-	uploadFile(t, "vdeb-b", "vdeb-one_1.0.0_amd64.deb", testsupport.MinimalDeb("vdeb-one", "1.0.0", "amd64"), "application/vnd.debian.binary-package")
-	uploadFile(t, "vdeb-b", "vdeb-two_2.0.0_amd64.deb", testsupport.MinimalDeb("vdeb-two", "2.0.0", "amd64"), "application/vnd.debian.binary-package")
-
-	// Local indexes regenerate asynchronously; merge only once vdeb-b lists both.
-	deadline := time.Now().Add(15 * time.Second)
-	for {
-		resp, body := doRequest(t, http.MethodGet, api("/api/v1/local/vdeb-b/Packages"), nil, "")
-		if resp.StatusCode == http.StatusOK && strings.Contains(string(body), "vdeb-two") || time.Now().After(deadline) {
-			break
-		}
-		time.Sleep(500 * time.Millisecond)
-	}
-
-	createVirtual(t, `{"name":"vdeb","package_type":"deb","members":["vdeb-a","vdeb-b"]}`)
-	defer deleteVirtual(t, "vdeb")
-
-	_, body := doRequest(t, http.MethodGet, api("/api/v1/virtual/vdeb/Packages"), nil, "")
-	pk := string(body)
-	if strings.Count(pk, "Package: vdeb-one\n") != 1 || !strings.Contains(pk, "Filename: vdeb-a/pool/vdeb-one_1.0.0_amd64.deb") ||
-		!strings.Contains(pk, "Filename: vdeb-b/pool/vdeb-two_2.0.0_amd64.deb") {
-		t.Fatalf("merged Packages should hold vdeb-one from the first member and vdeb-two:\n%s", pk)
-	}
-
-	network := os.Getenv("COMPOSE_NETWORK")
-	internal := os.Getenv("ARTIFACTAPI_INTERNAL")
-	if network == "" || internal == "" {
-		t.Skip("COMPOSE_NETWORK/ARTIFACTAPI_INTERNAL not set; skipping real apt")
-	}
-	if _, err := exec.LookPath("docker"); err != nil {
-		t.Skip("docker not available on the test host")
-	}
-	script := "set -euo pipefail; " +
-		"rm -f /etc/apt/sources.list.d/*; " +
-		"echo \"deb [trusted=yes] $URL ./\" > /etc/apt/sources.list.d/vdeb.list; " +
-		"apt-get update; " +
-		"apt-cache policy vdeb-one vdeb-two | tee /dev/stderr | grep -c virtual/vdeb | grep -qx 2; " +
-		"apt-get install -y vdeb-one vdeb-two; " +
-		"dpkg -s vdeb-one vdeb-two"
-	out, err := exec.Command("docker", "run", "--rm", "--network", network,
-		"-e", "URL="+strings.TrimRight(internal, "/")+"/api/v1/virtual/vdeb/",
-		"debian:13", "bash", "-c", script).CombinedOutput()
-	if err != nil {
-		t.Fatalf("real apt against deb virtual failed: %v\n%s", err, out)
-	}
-}
-
-// TestVirtualDebSuite merges two proxied deb.debian.org remotes and drives a
-// real apt through the virtual's dists/<suite> layout (by-hash indexes).
-func TestVirtualDebSuite(t *testing.T) {
-	network := os.Getenv("COMPOSE_NETWORK")
-	internal := os.Getenv("ARTIFACTAPI_INTERNAL")
-	if network == "" || internal == "" {
-		t.Skip("COMPOSE_NETWORK/ARTIFACTAPI_INTERNAL not set; skipping real apt")
-	}
-	if _, err := exec.LookPath("docker"); err != nil {
-		t.Skip("docker not available on the test host")
-	}
-	for _, n := range []string{"vdebs-a", "vdebs-b"} {
-		createRepo(t, `{"name":"`+n+`","package_type":"deb","repo_type":"remote","base_url":"http://deb.debian.org/debian"}`)
-		defer deleteRepo(t, n)
-	}
-	createVirtual(t, `{"name":"vdebs","package_type":"deb","members":["vdebs-a","vdebs-b"]}`)
-	defer deleteVirtual(t, "vdebs")
-
-	resp, rel := doRequest(t, http.MethodGet, api("/api/v1/virtual/vdebs/dists/trixie-updates/Release"), nil, "")
-	if resp.StatusCode != http.StatusOK || !strings.Contains(string(rel), "Acquire-By-Hash: yes\n") ||
-		!strings.Contains(string(rel), " main/binary-amd64/Packages.gz\n") {
-		t.Fatalf("merged suite Release: status %d:\n%s", resp.StatusCode, rel)
-	}
-
-	script := "set -euo pipefail; " +
-		"rm -f /etc/apt/sources.list.d/*; " +
-		"echo \"deb [trusted=yes] $URL trixie-updates main\" > /etc/apt/sources.list.d/vdebs.list; " +
-		"apt-get update; " +
-		"idx=/tmp/avail; apt-cache dumpavail > $idx; " +
-		"grep -q '^Filename: vdebs-a/pool/' $idx; if grep -q '^Filename: vdebs-b/' $idx; then echo 'vdebs-b not deduped'; exit 1; fi; " +
-		"pkg=$(awk '/^Package:/{p=$2} /^Size:/{if(!m||$2<m){m=$2;b=p}} END{print b}' $idx); " +
-		"cd /tmp && apt-get download $pkg && ls -l /tmp/*.deb"
-	out, err := exec.Command("docker", "run", "--rm", "--network", network,
-		"-e", "URL="+strings.TrimRight(internal, "/")+"/api/v1/virtual/vdebs/",
-		"debian:13", "bash", "-c", script).CombinedOutput()
-	if err != nil {
-		t.Fatalf("real apt against deb virtual suite failed: %v\n%s", err, out)
-	}
-	t.Logf("%s", out)
-	resp, _ = doRequest(t, http.MethodGet, api("/api/v1/remote/vdebs-a/dists/trixie-updates/main/binary-amd64/Packages.xz"), nil, "")
-	if src := resp.Header.Get("X-Artifact-Source"); resp.StatusCode != http.StatusOK || src != "cache" {
-		t.Fatalf("member index the virtual merged should be cached: status %d source %q", resp.StatusCode, src)
-	}
-}

internal/api/v1/npm.go

@@ -0,0 +1,322 @@
+package v1
+
+import (
+	"bytes"
+	"context"
+	"crypto/sha1"
+	"crypto/sha512"
+	"encoding/base64"
+	"encoding/hex"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"log/slog"
+	"net/http"
+	"net/url"
+	"regexp"
+	"strings"
+
+	"github.com/go-chi/chi/v5"
+
+	"git.unkin.net/unkin/artifactapi/internal/database"
+	"git.unkin.net/unkin/artifactapi/internal/storage"
+	"git.unkin.net/unkin/artifactapi/pkg/models"
+)
+
+// Local npm repos speak the npm registry publish/read protocol. Per package:
+//   <pkg>/-/<base>-<version>.tgz   tarball (immutable)
+//   <pkg>/-/<base>-<version>.json  version manifest (immutable)
+//   <pkg>/-/dist-tags/<tag>        version string (mutable)
+
+var (
+	npmNameRe   = regexp.MustCompile(`^(@[a-z0-9][a-z0-9._~-]*/)?[a-z0-9][a-z0-9._~-]*$`)
+	npmRefRe    = regexp.MustCompile(`^[0-9A-Za-z][0-9A-Za-z.+_-]*$`)
+	npmSemverRe = regexp.MustCompile(`^(0|[1-9]\d*)\.(0|[1-9]\d*)\.(0|[1-9]\d*)(?:-((?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?(?:\+([0-9a-zA-Z-]+(?:\.[0-9a-zA-Z-]+)*))?$`)
+
+	npmMaxPublishBytes int64 = 256 << 20
+)
+
+func (h *ProxyHandler) localNPMRemote(r *http.Request, name string) (*models.Remote, bool) {
+	remote, err := h.db.GetRemote(r.Context(), name)
+	if err != nil {
+		return nil, false
+	}
+	return remote, remote.RepoType == models.RepoTypeLocal && remote.PackageType == models.PackageNPM
+}
+
+// npmPackageName returns the package a packument/publish path addresses, or ""
+// when the path is something else (e.g. a tarball under <pkg>/-/).
+func npmPackageName(raw string) string {
+	p, err := url.PathUnescape(raw)
+	if err != nil {
+		return ""
+	}
+	p = strings.TrimSuffix(p, "/")
+	if !npmNameRe.MatchString(p) {
+		return ""
+	}
+	return p
+}
+
+type npmRelease struct {
+	version  string
+	manifest []byte
+	tarball  []byte
+	tags     []string
+}
+
+func parseNPMPublish(body io.Reader, pkg string) (*npmRelease, error) {
+	var doc struct {
+		Name        string                     `json:"name"`
+		DistTags    map[string]string          `json:"dist-tags"`
+		Versions    map[string]json.RawMessage `json:"versions"`
+		Attachments map[string]struct {
+			Data string `json:"data"`
+		} `json:"_attachments"`
+	}
+	if err := json.NewDecoder(body).Decode(&doc); err != nil {
+		return nil, fmt.Errorf("invalid publish body: %w", err)
+	}
+	if doc.Name != pkg {
+		return nil, fmt.Errorf("body name %q does not match %q", doc.Name, pkg)
+	}
+	if len(doc.Versions) != 1 || len(doc.Attachments) != 1 {
+		return nil, errors.New("publish must carry exactly one version and one tarball")
+	}
+
+	rel := &npmRelease{}
+	for v, m := range doc.Versions {
+		rel.version, rel.manifest = v, m
+	}
+	if !npmSemverRe.MatchString(rel.version) {
+		return nil, fmt.Errorf("invalid version %q", rel.version)
+	}
+	var meta struct {
+		Name    string `json:"name"`
+		Version string `json:"version"`
+		Dist    struct {
+			Integrity string `json:"integrity"`
+			Shasum    string `json:"shasum"`
+		} `json:"dist"`
+	}
+	if err := json.Unmarshal(rel.manifest, &meta); err != nil {
+		return nil, fmt.Errorf("invalid version manifest: %w", err)
+	}
+	if meta.Name != pkg || meta.Version != rel.version {
+		return nil, errors.New("version manifest name/version mismatch")
+	}
+
+	for _, a := range doc.Attachments {
+		tgz, err := base64.StdEncoding.DecodeString(a.Data)
+		if err != nil {
+			return nil, fmt.Errorf("invalid tarball encoding: %w", err)
+		}
+		rel.tarball = tgz
+	}
+	if err := verifyNPMDist(rel.tarball, meta.Dist.Integrity, meta.Dist.Shasum); err != nil {
+		return nil, err
+	}
+
+	for tag, v := range doc.DistTags {
+		if !npmRefRe.MatchString(tag) || v != rel.version {
+			return nil, fmt.Errorf("dist-tag %q must point at the published version", tag)
+		}
+		rel.tags = append(rel.tags, tag)
+	}
+	return rel, nil
+}
+
+func verifyNPMDist(tgz []byte, integrity, shasum string) error {
+	if b64, ok := strings.CutPrefix(integrity, "sha512-"); ok {
+		sum := sha512.Sum512(tgz)
+		if base64.StdEncoding.EncodeToString(sum[:]) != b64 {
+			return errors.New("tarball does not match dist.integrity")
+		}
+		return nil
+	}
+	if shasum != "" {
+		sum := sha1.Sum(tgz)
+		if hex.EncodeToString(sum[:]) != shasum {
+			return errors.New("tarball does not match dist.shasum")
+		}
+		return nil
+	}
+	return errors.New("version manifest carries no sha512 integrity or shasum")
+}
+
+func npmError(w http.ResponseWriter, status int, msg string) {
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(status)
+	_ = json.NewEncoder(w).Encode(map[string]string{"error": msg})
+}
+
+func (h *ProxyHandler) handleLocalPut(w http.ResponseWriter, r *http.Request) {
+	remote, ok := h.localNPMRemote(r, chi.URLParam(r, "localName"))
+	if !ok {
+		npmError(w, http.StatusMethodNotAllowed, "publish is only supported on local npm repositories")
+		return
+	}
+	pkg := npmPackageName(chi.URLParam(r, "*"))
+	if pkg == "" {
+		npmError(w, http.StatusBadRequest, "invalid package name")
+		return
+	}
+	rel, err := parseNPMPublish(http.MaxBytesReader(w, r.Body, npmMaxPublishBytes), pkg)
+	if err != nil {
+		var tooLarge *http.MaxBytesError
+		if errors.As(err, &tooLarge) {
+			npmError(w, http.StatusRequestEntityTooLarge, fmt.Sprintf("publish body exceeds %d bytes", npmMaxPublishBytes))
+			return
+		}
+		npmError(w, http.StatusBadRequest, err.Error())
+		return
+	}
+
+	base := pkg[strings.LastIndex(pkg, "/")+1:]
+	stem := pkg + "/-/" + base + "-" + rel.version
+	// The manifest gates visibility and tags may only name visible versions, so
+	// the order is tarball, manifest, tags. A tarball left by a failed publish is
+	// accepted again only with identical bytes; an existing manifest always conflicts.
+	conflict := func() {
+		npmError(w, http.StatusConflict, fmt.Sprintf("%s@%s already exists; overwrites are not allowed", pkg, rel.version))
+	}
+	ok, err = h.npmStoreImmutable(r.Context(), remote.Name, stem+".tgz", rel.tarball, "application/octet-stream")
+	if err != nil {
+		npmError(w, http.StatusInternalServerError, err.Error())
+		return
+	}
+	if !ok {
+		conflict()
+		return
+	}
+	if _, err := h.npmStore(r.Context(), remote.Name, stem+".json", rel.manifest, "application/json", false); err != nil {
+		if errors.Is(err, database.ErrAlreadyExists) {
+			conflict()
+			return
+		}
+		npmError(w, http.StatusInternalServerError, err.Error())
+		return
+	}
+	for _, tag := range rel.tags {
+		if _, err := h.npmStore(r.Context(), remote.Name, pkg+"/-/dist-tags/"+tag, []byte(rel.version), "text/plain", true); err != nil {
+			npmError(w, http.StatusInternalServerError, err.Error())
+			return
+		}
+	}
+
+	slog.Info("local npm package published", "repo", remote.Name, "package", pkg, "version", rel.version)
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(http.StatusCreated)
+	_ = json.NewEncoder(w).Encode(map[string]any{"ok": true, "id": pkg})
+}
+
+// npmStoreImmutable reports false when path already holds different bytes.
+func (h *ProxyHandler) npmStoreImmutable(ctx context.Context, repo, path string, data []byte, contentType string) (bool, error) {
+	hash, err := h.npmStore(ctx, repo, path, data, contentType, false)
+	if !errors.Is(err, database.ErrAlreadyExists) {
+		return err == nil, err
+	}
+	existing, err := h.db.GetLocalFile(ctx, repo, path)
+	if err != nil || existing == nil {
+		return false, fmt.Errorf("read existing %s: %v", path, err)
+	}
+	return existing.ContentHash == hash, nil
+}
+
+func (h *ProxyHandler) npmStore(ctx context.Context, repo, path string, data []byte, contentType string, mutable bool) (string, error) {
+	result, err := h.cas.Store(ctx, bytes.NewReader(data), contentType)
+	if err != nil {
+		return "", err
+	}
+	if err := h.db.UpsertBlob(ctx, result.ContentHash, result.S3Key, result.SizeBytes, contentType); err != nil {
+		return "", err
+	}
+	if mutable {
+		return result.ContentHash, h.db.UpsertLocalFile(ctx, repo, path, result.ContentHash)
+	}
+	return result.ContentHash, h.db.CreateLocalFile(ctx, repo, path, result.ContentHash)
+}
+
+func (h *ProxyHandler) readLocalBlob(ctx context.Context, contentHash string) ([]byte, error) {
+	reader, _, err := h.store.Download(ctx, storage.BlobKey(strings.TrimPrefix(contentHash, "sha256:")))
+	if err != nil {
+		return nil, err
+	}
+	defer reader.Close()
+	return io.ReadAll(reader)
+}
+
+func (h *ProxyHandler) serveNPMPackument(w http.ResponseWriter, r *http.Request, remote *models.Remote, pkg string) {
+	files, err := h.db.ListLocalFilesByPrefix(r.Context(), remote.Name, pkg+"/-/")
+	if err != nil {
+		npmError(w, http.StatusInternalServerError, err.Error())
+		return
+	}
+	read := func(hash string) ([]byte, error) { return h.readLocalBlob(r.Context(), hash) }
+	tarballBase := fmt.Sprintf("%s://%s/api/v1/local/%s/", scheme(r), r.Host, remote.Name)
+	doc, err := buildNPMPackument(pkg, files, read, tarballBase)
+	if err != nil {
+		npmError(w, http.StatusInternalServerError, err.Error())
+		return
+	}
+	if doc == nil {
+		npmError(w, http.StatusNotFound, "not found")
+		return
+	}
+	w.Header().Set("Content-Type", "application/json")
+	w.Header().Set("X-Artifact-Source", "local")
+	w.WriteHeader(http.StatusOK)
+	_ = json.NewEncoder(w).Encode(doc)
+}
+
+// buildNPMPackument returns nil when pkg has no published versions.
+func buildNPMPackument(pkg string, files []database.LocalFile, read func(hash string) ([]byte, error), tarballBase string) (map[string]any, error) {
+	prefix := pkg + "/-/"
+	versions := map[string]any{}
+	tags := map[string]string{}
+	for _, f := range files {
+		// LIKE treats '_' as a wildcard, so the prefix match can over-select.
+		rest, ok := strings.CutPrefix(f.FilePath, prefix)
+		if !ok {
+			continue
+		}
+		if tag, isTag := strings.CutPrefix(rest, "dist-tags/"); isTag {
+			v, err := read(f.ContentHash)
+			if err != nil {
+				return nil, err
+			}
+			tags[tag] = string(v)
+			continue
+		}
+		stem, isManifest := strings.CutSuffix(rest, ".json")
+		if !isManifest {
+			continue
+		}
+		raw, err := read(f.ContentHash)
+		if err != nil {
+			return nil, err
+		}
+		var m map[string]any
+		if err := json.Unmarshal(raw, &m); err != nil {
+			return nil, fmt.Errorf("manifest %s: %w", f.FilePath, err)
+		}
+		dist, _ := m["dist"].(map[string]any)
+		if dist == nil {
+			dist = map[string]any{}
+			m["dist"] = dist
+		}
+		dist["tarball"] = tarballBase + prefix + stem + ".tgz"
+		v, _ := m["version"].(string)
+		versions[v] = m
+	}
+	if len(versions) == 0 {
+		return nil, nil
+	}
+	for tag, v := range tags {
+		if _, ok := versions[v]; !ok {
+			delete(tags, tag)
+		}
+	}
+	return map[string]any{"_id": pkg, "name": pkg, "dist-tags": tags, "versions": versions}, nil
+}

internal/api/v1/npm_handler_test.go

@@ -0,0 +1,293 @@
+package v1
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"strings"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/go-chi/chi/v5"
+
+	"git.unkin.net/unkin/artifactapi/internal/database"
+	"git.unkin.net/unkin/artifactapi/internal/storage"
+	"git.unkin.net/unkin/artifactapi/internal/testsupport"
+	"git.unkin.net/unkin/artifactapi/pkg/models"
+)
+
+var (
+	testDSN   string
+	testMinio testsupport.MinioConn
+)
+
+func TestMain(m *testing.M) {
+	ctx := context.Background()
+	dsn, termPG, err := testsupport.StartPostgres(ctx)
+	if err != nil {
+		os.Exit(m.Run())
+	}
+	conn, termMinio, err := testsupport.StartMinio(ctx)
+	if err != nil {
+		termPG()
+		os.Exit(m.Run())
+	}
+	testDSN, testMinio = dsn, conn
+	code := m.Run()
+	termMinio()
+	termPG()
+	os.Exit(code)
+}
+
+func npmTestServer(t *testing.T) (*ProxyHandler, *httptest.Server) {
+	t.Helper()
+	if testDSN == "" {
+		t.Skip("Docker unavailable")
+	}
+	db, err := database.New(testDSN)
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(db.Close)
+	var store *storage.S3
+	for i := 0; i < 20; i++ {
+		if store, err = storage.NewS3(testMinio.Endpoint, testMinio.AccessKey, testMinio.SecretKey, "npm", false, ""); err == nil {
+			break
+		}
+		time.Sleep(500 * time.Millisecond)
+	}
+	if err != nil {
+		t.Fatal(err)
+	}
+	h := NewProxyHandler(nil, nil, db, store, nil)
+	r := chi.NewRouter()
+	r.Mount("/api/v1", h.Routes())
+	srv := httptest.NewServer(r)
+	t.Cleanup(srv.Close)
+	return h, srv
+}
+
+func npmRepo(t *testing.T, h *ProxyHandler, pt models.PackageType) string {
+	t.Helper()
+	name := fmt.Sprintf("npm-%s-%d", pt, time.Now().UnixNano())
+	if err := h.db.CreateRemote(context.Background(), &models.Remote{Name: name, PackageType: pt, RepoType: models.RepoTypeLocal}); err != nil {
+		t.Fatal(err)
+	}
+	return name
+}
+
+func npmDo(t *testing.T, method, url, body string) (int, string) {
+	t.Helper()
+	req, _ := http.NewRequest(method, url, strings.NewReader(body))
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer func() { _ = resp.Body.Close() }()
+	b, _ := io.ReadAll(resp.Body)
+	return resp.StatusCode, string(b)
+}
+
+func packumentVersions(t *testing.T, url string) map[string]any {
+	t.Helper()
+	code, body := npmDo(t, http.MethodGet, url, "")
+	if code != http.StatusOK {
+		t.Fatalf("GET %s = %d: %s", url, code, body)
+	}
+	var doc struct {
+		Versions map[string]any `json:"versions"`
+	}
+	if err := json.Unmarshal([]byte(body), &doc); err != nil {
+		t.Fatal(err)
+	}
+	return doc.Versions
+}
+
+func packumentTags(t *testing.T, url string) map[string]string {
+	t.Helper()
+	_, body := npmDo(t, http.MethodGet, url, "")
+	var doc struct {
+		Tags map[string]string `json:"dist-tags"`
+	}
+	if err := json.Unmarshal([]byte(body), &doc); err != nil {
+		t.Fatal(err)
+	}
+	return doc.Tags
+}
+
+func concurrentPuts(t *testing.T, url string, bodies ...string) []int {
+	t.Helper()
+	var wg sync.WaitGroup
+	codes := make([]int, len(bodies))
+	for i, b := range bodies {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			codes[i], _ = npmDo(t, http.MethodPut, url, b)
+		}()
+	}
+	wg.Wait()
+	return codes
+}
+
+func TestNPMPublishHandler(t *testing.T) {
+	h, srv := npmTestServer(t)
+	repo := npmRepo(t, h, models.PackageNPM)
+	base := srv.URL + "/api/v1/local/" + repo + "/"
+
+	t.Run("scoped name via %2f", func(t *testing.T) {
+		body := publishBody(t, "@acme/widget", []byte("scoped tgz"), publishOpts{})
+		if code, b := npmDo(t, http.MethodPut, base+"@acme%2fwidget", body); code != http.StatusCreated {
+			t.Fatalf("publish = %d: %s", code, b)
+		}
+		v := packumentVersions(t, base+"@acme%2fwidget")
+		dist := v["1.0.0"].(map[string]any)["dist"].(map[string]any)
+		tarball := dist["tarball"].(string)
+		if !strings.HasPrefix(tarball, base+"@acme/widget/-/widget-1.0.0.tgz") {
+			t.Fatalf("tarball = %s", tarball)
+		}
+		if code, b := npmDo(t, http.MethodGet, tarball, ""); code != http.StatusOK || b != "scoped tgz" {
+			t.Fatalf("tarball fetch = %d %q", code, b)
+		}
+	})
+
+	t.Run("republish", func(t *testing.T) {
+		if code, b := npmDo(t, http.MethodPut, base+"repub", publishBody(t, "repub", []byte("v1"), publishOpts{})); code != http.StatusCreated {
+			t.Fatalf("first publish = %d: %s", code, b)
+		}
+		if code, _ := npmDo(t, http.MethodPut, base+"repub", publishBody(t, "repub", []byte("different"), publishOpts{})); code != http.StatusConflict {
+			t.Errorf("different bytes = %d, want 409", code)
+		}
+		if code, b := npmDo(t, http.MethodPut, base+"repub", publishBody(t, "repub", []byte("v2"), publishOpts{version: "1.1.0"})); code != http.StatusCreated {
+			t.Fatalf("publish 1.1.0 = %d: %s", code, b)
+		}
+		if code, _ := npmDo(t, http.MethodPut, base+"repub", publishBody(t, "repub", []byte("v1"), publishOpts{})); code != http.StatusConflict {
+			t.Errorf("identical republish = %d, want 409", code)
+		}
+		if tags := packumentTags(t, base+"repub"); tags["latest"] != "1.1.0" {
+			t.Errorf("latest = %q, want 1.1.0", tags["latest"])
+		}
+	})
+
+	t.Run("rejected republish leaves tags", func(t *testing.T) {
+		for _, v := range []string{"1.0.0", "1.1.0"} {
+			if code, b := npmDo(t, http.MethodPut, base+"rej", publishBody(t, "rej", []byte("tgz "+v), publishOpts{version: v})); code != http.StatusCreated {
+				t.Fatalf("publish %s = %d: %s", v, code, b)
+			}
+		}
+		if code, _ := npmDo(t, http.MethodPut, base+"rej", publishBody(t, "rej", []byte("tgz 1.0.0"), publishOpts{shasum: "x"})); code != http.StatusConflict {
+			t.Fatalf("re-PUT 1.0.0 = %d, want 409", code)
+		}
+		if tags := packumentTags(t, base+"rej"); tags["latest"] != "1.1.0" {
+			t.Errorf("latest = %q, want 1.1.0", tags["latest"])
+		}
+	})
+
+	t.Run("mid-publish window", func(t *testing.T) {
+		if code, b := npmDo(t, http.MethodPut, base+"mid", publishBody(t, "mid", []byte("v1"), publishOpts{})); code != http.StatusCreated {
+			t.Fatalf("publish = %d: %s", code, b)
+		}
+		ctx := context.Background()
+		if _, err := h.npmStore(ctx, repo, "mid/-/mid-1.0.1.tgz", []byte("v2"), "application/octet-stream", false); err != nil {
+			t.Fatal(err)
+		}
+		if tags := packumentTags(t, base+"mid"); tags["latest"] != "1.0.0" {
+			t.Errorf("tarball-only 1.0.1: latest = %q", tags["latest"])
+		}
+		if _, err := h.npmStore(ctx, repo, "mid/-/dist-tags/latest", []byte("1.0.1"), "text/plain", true); err != nil {
+			t.Fatal(err)
+		}
+		if tags := packumentTags(t, base+"mid"); tags["latest"] == "1.0.1" {
+			t.Error("latest points at invisible 1.0.1")
+		}
+	})
+
+	t.Run("concurrent identical", func(t *testing.T) {
+		body := publishBody(t, "same", []byte("same tgz"), publishOpts{})
+		codes := concurrentPuts(t, base+"same", body, body)
+		if codes[0]+codes[1] != http.StatusCreated+http.StatusConflict || codes[0] == codes[1] {
+			t.Fatalf("codes = %v, want one 201 and one 409", codes)
+		}
+		if tags := packumentTags(t, base+"same"); len(tags) != 1 || tags["latest"] != "1.0.0" {
+			t.Errorf("tags = %v", tags)
+		}
+	})
+
+	t.Run("concurrent different manifests", func(t *testing.T) {
+		tgz := []byte("race tgz")
+		codes := concurrentPuts(t, base+"race",
+			publishBody(t, "race", tgz, publishOpts{shasum: "a", tags: map[string]string{"a": "1.0.0"}}),
+			publishBody(t, "race", tgz, publishOpts{shasum: "b", tags: map[string]string{"b": "1.0.0"}}))
+		won := map[int]string{}
+		for i, c := range codes {
+			won[c] = []string{"a", "b"}[i]
+		}
+		if len(won) != 2 || won[http.StatusCreated] == "" || won[http.StatusConflict] == "" {
+			t.Fatalf("codes = %v, want one 201 and one 409", codes)
+		}
+		v := packumentVersions(t, base+"race")["1.0.0"].(map[string]any)
+		if got := v["dist"].(map[string]any)["shasum"]; got != won[http.StatusCreated] {
+			t.Errorf("manifest shasum = %v, winner %s", got, won[http.StatusCreated])
+		}
+		tags := packumentTags(t, base+"race")
+		if len(tags) != 1 || tags[won[http.StatusCreated]] != "1.0.0" {
+			t.Errorf("tags = %v, winner %s", tags, won[http.StatusCreated])
+		}
+	})
+
+	t.Run("retry after tarball-only write", func(t *testing.T) {
+		tgz := []byte("half published")
+		if _, err := h.npmStore(context.Background(), repo, "retry/-/retry-1.0.0.tgz", tgz, "application/octet-stream", false); err != nil {
+			t.Fatal(err)
+		}
+		if code, _ := npmDo(t, http.MethodGet, base+"retry", ""); code != http.StatusNotFound {
+			t.Fatalf("tarball-only version visible: %d", code)
+		}
+		if code, _ := npmDo(t, http.MethodPut, base+"retry", publishBody(t, "retry", []byte("other bytes"), publishOpts{})); code != http.StatusConflict {
+			t.Errorf("retry with different bytes = %d, want 409", code)
+		}
+		if code, b := npmDo(t, http.MethodPut, base+"retry", publishBody(t, "retry", tgz, publishOpts{})); code != http.StatusCreated {
+			t.Fatalf("retry with identical bytes = %d: %s", code, b)
+		}
+		if _, ok := packumentVersions(t, base+"retry")["1.0.0"]; !ok {
+			t.Error("retried version missing from packument")
+		}
+	})
+
+	t.Run("concurrent versions", func(t *testing.T) {
+		codes := concurrentPuts(t, base+"conc",
+			publishBody(t, "conc", []byte("tgz 1.0.0"), publishOpts{version: "1.0.0"}),
+			publishBody(t, "conc", []byte("tgz 2.0.0"), publishOpts{version: "2.0.0"}))
+		if codes[0] != http.StatusCreated || codes[1] != http.StatusCreated {
+			t.Fatalf("codes = %v", codes)
+		}
+		v := packumentVersions(t, base+"conc")
+		if _, ok := v["1.0.0"]; !ok {
+			t.Error("1.0.0 missing")
+		}
+		if _, ok := v["2.0.0"]; !ok {
+			t.Error("2.0.0 missing")
+		}
+	})
+
+	t.Run("body too large", func(t *testing.T) {
+		old := npmMaxPublishBytes
+		npmMaxPublishBytes = 64
+		defer func() { npmMaxPublishBytes = old }()
+		if code, _ := npmDo(t, http.MethodPut, base+"big", publishBody(t, "big", []byte("x"), publishOpts{})); code != http.StatusRequestEntityTooLarge {
+			t.Errorf("oversized body = %d, want 413", code)
+		}
+	})
+
+	t.Run("non-npm local", func(t *testing.T) {
+		generic := npmRepo(t, h, models.PackageGeneric)
+		if code, _ := npmDo(t, http.MethodPut, srv.URL+"/api/v1/local/"+generic+"/pkg", publishBody(t, "pkg", []byte("x"), publishOpts{})); code != http.StatusMethodNotAllowed {
+			t.Errorf("publish to generic local = %d, want 405", code)
+		}
+	})
+}

internal/api/v1/npm_test.go

@@ -0,0 +1,166 @@
+package v1
+
+import (
+	"crypto/sha1"
+	"crypto/sha512"
+	"encoding/base64"
+	"encoding/hex"
+	"encoding/json"
+	"errors"
+	"strings"
+	"testing"
+
+	"git.unkin.net/unkin/artifactapi/internal/database"
+)
+
+func TestNPMPackageName(t *testing.T) {
+	tests := map[string]string{
+		"left-pad":                "left-pad",
+		"left-pad/":               "left-pad",
+		"@acme%2fwidget":          "@acme/widget",
+		"@acme%2Fwidget":          "@acme/widget",
+		"@acme/widget":            "@acme/widget",
+		"left-pad/-/left-pad.tgz": "",
+		"@acme/widget/-/w-1.tgz":  "",
+		"a/b":                     "",
+		"../etc":                  "",
+		"Upper":                   "",
+		"":                        "",
+	}
+	for in, want := range tests {
+		if got := npmPackageName(in); got != want {
+			t.Errorf("npmPackageName(%q) = %q, want %q", in, got, want)
+		}
+	}
+}
+
+type publishOpts struct {
+	bodyName, manifestName, version, integrity, shasum string
+	tags                                               map[string]string
+	extraVersion                                       bool
+}
+
+func publishBody(t *testing.T, pkg string, tgz []byte, o publishOpts) string {
+	t.Helper()
+	sha := sha512.Sum512(tgz)
+	sh1 := sha1.Sum(tgz)
+	if o.bodyName == "" {
+		o.bodyName = pkg
+	}
+	if o.manifestName == "" {
+		o.manifestName = pkg
+	}
+	if o.version == "" {
+		o.version = "1.0.0"
+	}
+	if o.integrity == "" {
+		o.integrity = "sha512-" + base64.StdEncoding.EncodeToString(sha[:])
+	}
+	if o.shasum == "" {
+		o.shasum = hex.EncodeToString(sh1[:])
+	}
+	if o.tags == nil {
+		o.tags = map[string]string{"latest": o.version}
+	}
+	versions := map[string]any{o.version: map[string]any{
+		"name": o.manifestName, "version": o.version, "main": "index.js",
+		"dist": map[string]any{"integrity": o.integrity, "shasum": o.shasum, "tarball": "http://elsewhere/x.tgz"},
+	}}
+	if o.extraVersion {
+		versions["2.0.0"] = map[string]any{"name": pkg, "version": "2.0.0"}
+	}
+	b, _ := json.Marshal(map[string]any{
+		"_id": pkg, "name": o.bodyName, "dist-tags": o.tags, "versions": versions,
+		"_attachments": map[string]any{pkg + "-" + o.version + ".tgz": map[string]any{
+			"content_type": "application/octet-stream", "data": base64.StdEncoding.EncodeToString(tgz), "length": len(tgz),
+		}},
+	})
+	return string(b)
+}
+
+func TestParseNPMPublish(t *testing.T) {
+	tgz := []byte("fake tarball bytes")
+
+	rel, err := parseNPMPublish(strings.NewReader(publishBody(t, "@acme/widget", tgz, publishOpts{tags: map[string]string{"latest": "1.0.0", "beta": "1.0.0"}})), "@acme/widget")
+	if err != nil {
+		t.Fatalf("valid scoped publish rejected: %v", err)
+	}
+	if rel.version != "1.0.0" || string(rel.tarball) != string(tgz) || len(rel.tags) != 2 {
+		t.Fatalf("unexpected release: %+v", rel)
+	}
+
+	if _, err := parseNPMPublish(strings.NewReader(publishBody(t, "left-pad", tgz, publishOpts{integrity: "none", shasum: hex.EncodeToString(make([]byte, 20))})), "left-pad"); err == nil {
+		t.Fatal("shasum fallback should reject a mismatched tarball")
+	}
+	if _, err := parseNPMPublish(strings.NewReader(publishBody(t, "left-pad", tgz, publishOpts{integrity: "none"})), "left-pad"); err != nil {
+		t.Fatalf("matching shasum fallback rejected: %v", err)
+	}
+
+	bad := map[string]publishOpts{
+		"body name mismatch":        {bodyName: "other"},
+		"manifest name mismatch":    {manifestName: "other"},
+		"integrity mismatch":        {integrity: "sha512-AAAA"},
+		"path-like version":         {version: "../1.0.0"},
+		"non-semver version":        {version: "1..2"},
+		"leading-zero version":      {version: "01.0.0"},
+		"tag at another version":    {tags: map[string]string{"latest": "9.9.9"}},
+		"path-like tag":             {tags: map[string]string{"../x": "1.0.0"}},
+		"multiple versions at once": {extraVersion: true},
+	}
+	for name, o := range bad {
+		if _, err := parseNPMPublish(strings.NewReader(publishBody(t, "left-pad", tgz, o)), "left-pad"); err == nil {
+			t.Errorf("%s: expected rejection", name)
+		}
+	}
+	if _, err := parseNPMPublish(strings.NewReader(`{"name":"left-pad","versions":{}}`), "left-pad"); err == nil {
+		t.Error("deprecate-style body without attachments should be rejected")
+	}
+}
+
+func TestBuildNPMPackument(t *testing.T) {
+	blobs := map[string]string{
+		"h1": `{"name":"my_pkg","version":"1.0.0","dist":{"shasum":"aa","tarball":"http://elsewhere/x.tgz"}}`,
+		"h2": `{"name":"my_pkg","version":"1.1.0"}`,
+		"h3": "1.1.0",
+		"h4": "2.0.0",
+		"hx": `{"name":"myXpkg","version":"6.6.6"}`,
+	}
+	read := func(h string) ([]byte, error) {
+		b, ok := blobs[h]
+		if !ok {
+			return nil, errors.New("missing blob")
+		}
+		return []byte(b), nil
+	}
+	files := []database.LocalFile{
+		{FilePath: "my_pkg/-/dist-tags/latest", ContentHash: "h3"},
+		{FilePath: "my_pkg/-/dist-tags/next", ContentHash: "h4"},
+		{FilePath: "my_pkg/-/my_pkg-1.0.0.json", ContentHash: "h1"},
+		{FilePath: "my_pkg/-/my_pkg-1.0.0.tgz", ContentHash: "nope"},
+		{FilePath: "my_pkg/-/my_pkg-1.1.0.json", ContentHash: "h2"},
+		{FilePath: "myXpkg/-/myXpkg-6.6.6.json", ContentHash: "hx"},
+	}
+
+	doc, err := buildNPMPackument("my_pkg", files, read, "http://reg/api/v1/local/npm/")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if tags := doc["dist-tags"].(map[string]string); tags["latest"] != "1.1.0" || len(tags) != 1 {
+		t.Errorf("dist-tags = %v", tags)
+	}
+	versions := doc["versions"].(map[string]any)
+	if len(versions) != 2 {
+		t.Fatalf("versions = %v (LIKE over-match must be dropped)", versions)
+	}
+	v1 := versions["1.0.0"].(map[string]any)["dist"].(map[string]any)
+	if v1["tarball"] != "http://reg/api/v1/local/npm/my_pkg/-/my_pkg-1.0.0.tgz" || v1["shasum"] != "aa" {
+		t.Errorf("1.0.0 dist = %v", v1)
+	}
+	if versions["1.1.0"].(map[string]any)["dist"].(map[string]any)["tarball"] != "http://reg/api/v1/local/npm/my_pkg/-/my_pkg-1.1.0.tgz" {
+		t.Error("1.1.0 missing rewritten tarball")
+	}
+
+	if doc, err := buildNPMPackument("absent", files, read, "x/"); err != nil || doc != nil {
+		t.Errorf("absent package: doc=%v err=%v", doc, err)
+	}
+}

internal/api/v1/npm_virtual.go

@@ -0,0 +1,26 @@
+package v1
+
+import (
+	"context"
+	"encoding/json"
+
+	"git.unkin.net/unkin/artifactapi/internal/virtual"
+)
+
+// LocalNPMPackument serves a local npm repo's packument to npm virtuals, with
+// tarball paths relative to the repo.
+func (h *ProxyHandler) LocalNPMPackument(ctx context.Context, repo, pkg string) ([]byte, error) {
+	files, err := h.db.ListLocalFilesByPrefix(ctx, repo, pkg+"/-/")
+	if err != nil {
+		return nil, err
+	}
+	read := func(hash string) ([]byte, error) { return h.readLocalBlob(ctx, hash) }
+	doc, err := buildNPMPackument(pkg, files, read, "")
+	if err != nil {
+		return nil, err
+	}
+	if doc == nil {
+		return nil, virtual.ErrNotFound
+	}
+	return json.Marshal(doc)
+}

internal/api/v1/proxy.go

@@ -7,6 +7,7 @@ import (
 	"io"
 	"log/slog"
 	"net/http"
+	"strings"
 
 	"github.com/go-chi/chi/v5"
 
@@ -16,6 +17,7 @@ import (
 	"git.unkin.net/unkin/artifactapi/internal/proxy"
 	"git.unkin.net/unkin/artifactapi/internal/storage"
 	"git.unkin.net/unkin/artifactapi/internal/virtual"
+	"git.unkin.net/unkin/artifactapi/pkg/models"
 )
 
 type ProxyHandler struct {
@@ -42,6 +44,7 @@ func (h *ProxyHandler) Routes() chi.Router {
 	r := chi.NewRouter()
 	r.Get("/remote/{remoteName}/*", h.handleProxy)
 	r.Get("/local/{localName}/*", h.handleLocal)
+	r.Put("/local/{localName}/*", h.handleLocalPut)
 	r.Get("/virtual/{virtualName}/*", h.handleVirtual)
 	return r
 }
@@ -184,7 +187,14 @@ func (h *ProxyHandler) handleVirtual(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	body, contentType, err := h.virtualEngine.Fetch(r.Context(), *virt, path, proxyBaseURL)
+	var body []byte
+	var contentType string
+	if virt.PackageType == models.PackageNPM {
+		abbreviated := strings.Contains(r.Header.Get("Accept"), virtual.NPMAbbreviatedType)
+		body, contentType, err = h.virtualEngine.FetchNPM(r.Context(), *virt, path, proxyBaseURL, abbreviated)
+	} else {
+		body, contentType, err = h.virtualEngine.Fetch(r.Context(), *virt, path, proxyBaseURL)
+	}
 	if errors.Is(err, virtual.ErrNotFound) {
 		http.Error(w, "not found", http.StatusNotFound)
 		return
@@ -211,6 +221,13 @@ func (h *ProxyHandler) handleLocal(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	if remote.PackageType == models.PackageNPM {
+		if pkg := npmPackageName(path); pkg != "" {
+			h.serveNPMPackument(w, r, remote, pkg)
+			return
+		}
+	}
+
 	prov, _ := provider.Get(remote.PackageType)
 	if indexer, ok := prov.(provider.LocalIndexer); ok {
 		if indexer.ServeLocalIndex(w, r, h.db, remote.Name, path) {

internal/database/helm_metadata.go

@@ -0,0 +1,44 @@
+package database
+
+import (
+	"context"
+
+	"git.unkin.net/unkin/artifactapi/internal/provider"
+)
+
+func (db *DB) InsertHelmMetadata(ctx context.Context, meta *provider.HelmMetadata) error {
+	_, err := db.Pool.Exec(ctx, `
+		INSERT INTO helm_metadata (repo_name, file_path, content_hash, name, version, chart_yaml)
+		VALUES ($1,$2,$3,$4,$5,$6)
+		ON CONFLICT (repo_name, file_path) DO NOTHING
+	`, meta.RepoName, meta.FilePath, meta.ContentHash, meta.Name, meta.Version, meta.ChartYAML)
+	return err
+}
+
+func (db *DB) DeleteHelmMetadata(ctx context.Context, repoName, filePath string) error {
+	_, err := db.Pool.Exec(ctx, `DELETE FROM helm_metadata WHERE repo_name = $1 AND file_path = $2`, repoName, filePath)
+	return err
+}
+
+func (db *DB) ListHelmMetadataEntries(ctx context.Context, repoName string) ([]provider.HelmMetadata, error) {
+	rows, err := db.Pool.Query(ctx, `
+		SELECT repo_name, file_path, content_hash, name, version, chart_yaml, created_at
+		FROM helm_metadata
+		WHERE repo_name = $1
+		ORDER BY name, version, file_path
+	`, repoName)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var result []provider.HelmMetadata
+	for rows.Next() {
+		var m provider.HelmMetadata
+		if err := rows.Scan(&m.RepoName, &m.FilePath, &m.ContentHash, &m.Name, &m.Version, &m.ChartYAML, &m.CreatedAt); err != nil {
+			return nil, err
+		}
+		result = append(result, m)
+	}
+	return result, rows.Err()
+}

internal/database/puppet_metadata.go

@@ -0,0 +1,46 @@
+package database
+
+import (
+	"context"
+
+	"git.unkin.net/unkin/artifactapi/internal/provider"
+)
+
+func (db *DB) InsertPuppetMetadata(ctx context.Context, meta *provider.PuppetMetadata) error {
+	_, err := db.Pool.Exec(ctx, `
+		INSERT INTO puppet_metadata (repo_name, file_path, content_hash, slug, version, metadata_json, file_size, file_md5)
+		VALUES ($1,$2,$3,$4,$5,$6,$7,$8)
+		ON CONFLICT (repo_name, file_path) DO NOTHING
+	`, meta.RepoName, meta.FilePath, meta.ContentHash, meta.Slug, meta.Version, meta.MetadataJSON, meta.Size, meta.MD5)
+	return err
+}
+
+func (db *DB) DeletePuppetMetadata(ctx context.Context, repoName, filePath string) error {
+	_, err := db.Pool.Exec(ctx, `DELETE FROM puppet_metadata WHERE repo_name = $1 AND file_path = $2`, repoName, filePath)
+	return err
+}
+
+// ListPuppetMetadataEntries returns a repo's releases, optionally narrowed to
+// one module slug (empty slug lists every module).
+func (db *DB) ListPuppetMetadataEntries(ctx context.Context, repoName, slug string) ([]provider.PuppetMetadata, error) {
+	rows, err := db.Pool.Query(ctx, `
+		SELECT repo_name, file_path, content_hash, slug, version, metadata_json, file_size, file_md5, created_at
+		FROM puppet_metadata
+		WHERE repo_name = $1 AND ($2 = '' OR slug = $2)
+		ORDER BY slug, file_path
+	`, repoName, slug)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var result []provider.PuppetMetadata
+	for rows.Next() {
+		var m provider.PuppetMetadata
+		if err := rows.Scan(&m.RepoName, &m.FilePath, &m.ContentHash, &m.Slug, &m.Version, &m.MetadataJSON, &m.Size, &m.MD5, &m.CreatedAt); err != nil {
+			return nil, err
+		}
+		result = append(result, m)
+	}
+	return result, rows.Err()
+}

internal/provider/all/alpine.go

@@ -0,0 +1,3 @@
+package all
+
+import _ "git.unkin.net/unkin/artifactapi/internal/provider/alpine"

internal/provider/all/cargo.go

@@ -0,0 +1,3 @@
+package all
+
+import _ "git.unkin.net/unkin/artifactapi/internal/provider/cargo"

internal/provider/all/deb.go

@@ -0,0 +1,3 @@
+package all
+
+import _ "git.unkin.net/unkin/artifactapi/internal/provider/deb"

internal/provider/all/docker.go

@@ -0,0 +1,3 @@
+package all
+
+import _ "git.unkin.net/unkin/artifactapi/internal/provider/docker"

internal/provider/all/generic.go

@@ -0,0 +1,3 @@
+package all
+
+import _ "git.unkin.net/unkin/artifactapi/internal/provider/generic"

internal/provider/all/goproxy.go

@@ -0,0 +1,3 @@
+package all
+
+import _ "git.unkin.net/unkin/artifactapi/internal/provider/goproxy"

internal/provider/all/helm.go

@@ -0,0 +1,3 @@
+package all
+
+import _ "git.unkin.net/unkin/artifactapi/internal/provider/helm"

internal/provider/all/npm.go

@@ -0,0 +1,3 @@
+package all
+
+import _ "git.unkin.net/unkin/artifactapi/internal/provider/npm"

internal/provider/all/nuget.go

@@ -0,0 +1,3 @@
+package all
+
+import _ "git.unkin.net/unkin/artifactapi/internal/provider/nuget"

internal/provider/all/puppet.go

@@ -0,0 +1,3 @@
+package all
+
+import _ "git.unkin.net/unkin/artifactapi/internal/provider/puppet"

internal/provider/all/pypi.go

@@ -0,0 +1,3 @@
+package all
+
+import _ "git.unkin.net/unkin/artifactapi/internal/provider/pypi"

internal/provider/all/rpm.go

@@ -0,0 +1,3 @@
+package all
+
+import _ "git.unkin.net/unkin/artifactapi/internal/provider/rpm"

internal/provider/all/terraform.go

@@ -0,0 +1,3 @@
+package all
+
+import _ "git.unkin.net/unkin/artifactapi/internal/provider/terraform"

internal/provider/cap_file_store.go

@@ -0,0 +1,15 @@
+package provider
+
+import (
+	"context"
+	"io"
+)
+
+type FileStore interface {
+	ListFilesByPrefix(ctx context.Context, repoName, prefix string) ([]FileEntry, error)
+	ListPackages(ctx context.Context, repoName string) ([]string, error)
+}
+
+type BlobReader interface {
+	Download(ctx context.Context, key string) (io.ReadCloser, int64, error)
+}

internal/provider/cap_index_merger.go

@@ -0,0 +1,10 @@
+package provider
+
+type IndexMerger interface {
+	MergeIndexes(members []MemberIndex, proxyBaseURL string) ([]byte, error)
+}
+
+type MemberIndex struct {
+	RemoteName string
+	Body       []byte
+}

internal/provider/cap_local_indexer.go

@@ -0,0 +1,11 @@
+package provider
+
+import (
+	"context"
+	"net/http"
+)
+
+type LocalIndexer interface {
+	ServeLocalIndex(w http.ResponseWriter, r *http.Request, files FileStore, repoName, path string) bool
+	GenerateLocalIndex(ctx context.Context, files FileStore, repoName, path string) ([]byte, error)
+}

internal/provider/cap_local_uploader.go

@@ -0,0 +1,6 @@
+package provider
+
+type LocalUploader interface {
+	ValidateUpload(filePath string) (storagePath, contentType string, err error)
+	UploadResponse(storagePath, contentHash string, sizeBytes int64) map[string]any
+}

internal/provider/cap_post_delete_hook.go

@@ -0,0 +1,11 @@
+package provider
+
+import (
+	"context"
+)
+
+// PostDeleteHook lets a provider clean up derived state (e.g. RPM metadata that
+// feeds generated repodata) after a local file is removed.
+type PostDeleteHook interface {
+	AfterDelete(ctx context.Context, repoName, storagePath string, db MetadataDeleter) error
+}

internal/provider/cap_post_upload_hook.go

@@ -0,0 +1,9 @@
+package provider
+
+import (
+	"context"
+)
+
+type PostUploadHook interface {
+	AfterUpload(ctx context.Context, repoName, storagePath, contentHash string, blobs BlobReader, db MetadataStore)
+}

internal/provider/cap_remote_server.go

@@ -0,0 +1,25 @@
+package provider
+
+import (
+	"net/http"
+
+	"git.unkin.net/unkin/artifactapi/pkg/models"
+)
+
+// RemoteServer lets a remote provider fully answer a request itself instead of
+// going through the byte-proxy engine. It is the remote-side analog of
+// LocalIndexer: a metadata-only remote (e.g. github_rpm) uses it to synthesize
+// repodata from derived per-asset metadata and to redirect package downloads to
+// a backend remote, without ever precaching the packages. Returning false lets
+// the normal proxy path take over.
+type RemoteServer interface {
+	ServeRemote(w http.ResponseWriter, r *http.Request, remote models.Remote, path, proxyBaseURL string, store RemoteMetadataStore) bool
+}
+
+// RemoteMetadataStore is the persistence surface a RemoteServer needs to cache
+// and read the metadata it derives per upstream asset. *database.DB satisfies it.
+type RemoteMetadataStore interface {
+	RPMMetadataReader
+	MetadataStore
+	MetadataDeleter
+}

internal/provider/cap_serve_rewriter.go

@@ -0,0 +1,12 @@
+package provider
+
+import (
+	"git.unkin.net/unkin/artifactapi/pkg/models"
+)
+
+// ServeRewriter rewrites a cached mutable remote response per request, for
+// indexes whose URLs must name the requesting host and so cannot be rewritten
+// before caching.
+type ServeRewriter interface {
+	RewriteServed(body []byte, remote models.Remote, proxyBaseURL string) []byte
+}

internal/provider/helm/helm.go

@@ -1,12 +1,24 @@
 package helm
 
 import (
+	"archive/tar"
+	"compress/gzip"
 	"context"
+	"errors"
+	"fmt"
+	"io"
+	"log/slog"
 	"net/http"
+	"net/url"
+	"path"
 	"strings"
+	"time"
+
+	"gopkg.in/yaml.v3"
 
 	"git.unkin.net/unkin/artifactapi/internal/auth"
 	"git.unkin.net/unkin/artifactapi/internal/provider"
+	"git.unkin.net/unkin/artifactapi/internal/storage"
 	"git.unkin.net/unkin/artifactapi/pkg/models"
 )
 
@@ -56,3 +68,203 @@ func (p *Provider) RewriteResponse(body []byte, remote models.Remote, proxyBaseU
 func (p *Provider) AuthHeaders(_ context.Context, remote models.Remote) (http.Header, error) {
 	return auth.BasicHeaders(remote), nil
 }
+
+// ValidateUpload stores charts flat by filename so index.yaml can reference
+// them with relative urls, as `helm repo index` does.
+func (p *Provider) ValidateUpload(filePath string) (storagePath, contentType string, err error) {
+	filename := path.Base(path.Clean("/" + filePath))
+	if !strings.HasSuffix(filename, ".tgz") || filename == ".tgz" {
+		return "", "", fmt.Errorf("file must be a .tgz chart package")
+	}
+	return filename, "application/gzip", nil
+}
+
+func (p *Provider) UploadResponse(storagePath, contentHash string, sizeBytes int64) map[string]any {
+	return map[string]any{
+		"filename":     storagePath,
+		"content_hash": contentHash,
+		"size_bytes":   sizeBytes,
+	}
+}
+
+func (p *Provider) AfterUpload(ctx context.Context, repoName, storagePath, contentHash string, blobs provider.BlobReader, db provider.MetadataStore) {
+	reader, _, err := blobs.Download(ctx, storage.BlobKey(strings.TrimPrefix(contentHash, "sha256:")))
+	if err != nil {
+		slog.Error("helm metadata: download failed", "repo", repoName, "path", storagePath, "error", err)
+		return
+	}
+	defer func() { _ = reader.Close() }()
+
+	meta, err := parseChart(reader)
+	if err != nil {
+		slog.Error("helm metadata: parse failed", "repo", repoName, "path", storagePath, "error", err)
+		return
+	}
+	if want := meta.Name + "-" + meta.Version + ".tgz"; storagePath != want {
+		slog.Error("helm metadata: filename does not match chart", "repo", repoName, "path", storagePath, "expected", want)
+		return
+	}
+	meta.RepoName = repoName
+	meta.FilePath = storagePath
+	meta.ContentHash = contentHash
+
+	store, ok := db.(provider.HelmMetadataStore)
+	if !ok {
+		slog.Error("helm metadata: store does not support helm metadata", "repo", repoName)
+		return
+	}
+	if err := store.InsertHelmMetadata(ctx, meta); err != nil {
+		slog.Error("helm metadata: insert failed", "repo", repoName, "path", storagePath, "error", err)
+		return
+	}
+	slog.Info("helm metadata: parsed", "repo", repoName, "name", meta.Name, "version", meta.Version)
+}
+
+func (p *Provider) AfterDelete(ctx context.Context, repoName, storagePath string, db provider.MetadataDeleter) error {
+	deleter, ok := db.(provider.HelmMetadataDeleter)
+	if !ok {
+		return nil
+	}
+	return deleter.DeleteHelmMetadata(ctx, repoName, storagePath)
+}
+
+func isIndexPath(p string) bool {
+	return strings.TrimPrefix(path.Clean("/"+p), "/") == "index.yaml"
+}
+
+func (p *Provider) ServeLocalIndex(w http.ResponseWriter, r *http.Request, files provider.FileStore, repoName, reqPath string) bool {
+	if !isIndexPath(reqPath) {
+		return false
+	}
+	body, err := p.GenerateLocalIndex(r.Context(), files, repoName, reqPath)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return true
+	}
+	w.Header().Set("Content-Type", "text/yaml")
+	w.WriteHeader(http.StatusOK)
+	_, _ = w.Write(body)
+	return true
+}
+
+func (p *Provider) GenerateLocalIndex(ctx context.Context, files provider.FileStore, repoName, reqPath string) ([]byte, error) {
+	if !isIndexPath(reqPath) {
+		return nil, fmt.Errorf("unsupported index path: %q", reqPath)
+	}
+	reader, ok := files.(provider.HelmMetadataReader)
+	if !ok {
+		return nil, errors.New("helm metadata not available")
+	}
+	metas, err := reader.ListHelmMetadataEntries(ctx, repoName)
+	if err != nil {
+		return nil, err
+	}
+	return generateIndex(metas)
+}
+
+// generateIndex builds index.yaml from stored Chart.yaml documents; it is
+// stamped from the newest upload so every replica serves identical bytes.
+func generateIndex(metas []provider.HelmMetadata) ([]byte, error) {
+	entries := map[string][]map[string]yaml.Node{}
+	var newest time.Time
+	budget := provider.MaxAliasExpandedNodes
+	for _, m := range metas {
+		var raw map[string]yaml.Node
+		if err := yaml.Unmarshal([]byte(m.ChartYAML), &raw); err != nil {
+			return nil, fmt.Errorf("chart %s: %w", m.FilePath, err)
+		}
+		chart, err := provider.ExpandYAMLAliases(raw, &budget)
+		if err != nil {
+			slog.Warn("helm index: dropping chart", "chart", m.Name, "path", m.FilePath, "error", err)
+			continue
+		}
+		chart["name"] = node(m.Name)
+		chart["version"] = node(m.Version)
+		chart["urls"] = node([]string{url.PathEscape(m.FilePath)})
+		chart["digest"] = node(strings.TrimPrefix(m.ContentHash, "sha256:"))
+		chart["created"] = node(m.CreatedAt.UTC().Format(time.RFC3339Nano))
+		entries[m.Name] = append(entries[m.Name], chart)
+		if m.CreatedAt.After(newest) {
+			newest = m.CreatedAt
+		}
+	}
+	return yaml.Marshal(map[string]any{
+		"apiVersion": "v1",
+		"entries":    entries,
+		"generated":  newest.UTC().Format(time.RFC3339Nano),
+	})
+}
+
+func node(v any) yaml.Node {
+	var n yaml.Node
+	_ = n.Encode(v)
+	return n
+}
+
+const (
+	maxChartYAML    = 1 << 20
+	maxChartBytes   = 50 << 20
+	maxChartEntries = 10000
+)
+
+var errChartTooLarge = fmt.Errorf("chart archive exceeds %d decompressed bytes", maxChartBytes)
+
+type capReader struct {
+	r io.Reader
+	n int64
+}
+
+func (c *capReader) Read(p []byte) (int, error) {
+	if c.n <= 0 {
+		return 0, errChartTooLarge
+	}
+	if int64(len(p)) > c.n {
+		p = p[:c.n]
+	}
+	n, err := c.r.Read(p)
+	c.n -= int64(n)
+	return n, err
+}
+
+// parseChart reads the top-level <chart>/Chart.yaml from a packaged chart.
+func parseChart(r io.Reader) (*provider.HelmMetadata, error) {
+	zr, err := gzip.NewReader(r)
+	if err != nil {
+		return nil, err
+	}
+	tr := tar.NewReader(&capReader{r: zr, n: maxChartBytes})
+	for entries := 0; ; entries++ {
+		if entries >= maxChartEntries {
+			return nil, fmt.Errorf("chart archive exceeds %d entries", maxChartEntries)
+		}
+		hdr, err := tr.Next()
+		if err == io.EOF {
+			return nil, errors.New("no Chart.yaml in chart archive")
+		}
+		if err != nil {
+			return nil, err
+		}
+		dir, file := path.Split(path.Clean(hdr.Name))
+		if file != "Chart.yaml" || strings.Count(dir, "/") != 1 {
+			continue
+		}
+		raw, err := io.ReadAll(io.LimitReader(tr, maxChartYAML+1))
+		if err != nil {
+			return nil, err
+		}
+		if len(raw) > maxChartYAML {
+			return nil, fmt.Errorf("parse Chart.yaml: exceeds %d bytes", maxChartYAML)
+		}
+		var chart struct {
+			Name    string `yaml:"name"`
+			Version string `yaml:"version"`
+		}
+		if err := yaml.Unmarshal(raw, &chart); err != nil {
+			return nil, fmt.Errorf("parse Chart.yaml: %w", err)
+		}
+		if chart.Name == "" || chart.Version == "" {
+			return nil, errors.New("chart metadata missing name or version")
+		}
+		return &provider.HelmMetadata{Name: chart.Name, Version: chart.Version, ChartYAML: string(raw)}, nil
+	}
+}

internal/provider/helm/helm_local_test.go

@@ -0,0 +1,236 @@
+package helm
+
+import (
+	"archive/tar"
+	"bytes"
+	"compress/gzip"
+	"context"
+	"io"
+	"net/http/httptest"
+	"strconv"
+	"strings"
+	"testing"
+	"time"
+
+	"gopkg.in/yaml.v3"
+
+	"git.unkin.net/unkin/artifactapi/internal/provider"
+)
+
+func chartTgz(t *testing.T, files map[string]string) []byte {
+	t.Helper()
+	var buf bytes.Buffer
+	zw := gzip.NewWriter(&buf)
+	tw := tar.NewWriter(zw)
+	for name, body := range files {
+		if err := tw.WriteHeader(&tar.Header{Name: name, Mode: 0o644, Size: int64(len(body))}); err != nil {
+			t.Fatal(err)
+		}
+		if _, err := tw.Write([]byte(body)); err != nil {
+			t.Fatal(err)
+		}
+	}
+	if err := tw.Close(); err != nil {
+		t.Fatal(err)
+	}
+	if err := zw.Close(); err != nil {
+		t.Fatal(err)
+	}
+	return buf.Bytes()
+}
+
+type fakeBlobs struct{ data []byte }
+
+func (f fakeBlobs) Download(context.Context, string) (io.ReadCloser, int64, error) {
+	return io.NopCloser(bytes.NewReader(f.data)), int64(len(f.data)), nil
+}
+
+type fakeStore struct {
+	inserted *provider.HelmMetadata
+	metas    []provider.HelmMetadata
+}
+
+func (f *fakeStore) InsertRPMMetadata(context.Context, *provider.RPMMetadata) error { return nil }
+func (f *fakeStore) InsertDebMetadata(context.Context, *provider.DebMetadata) error { return nil }
+func (f *fakeStore) InsertHelmMetadata(_ context.Context, m *provider.HelmMetadata) error {
+	f.inserted = m
+	return nil
+}
+func (f *fakeStore) ListHelmMetadataEntries(context.Context, string) ([]provider.HelmMetadata, error) {
+	return f.metas, nil
+}
+func (f *fakeStore) ListFilesByPrefix(context.Context, string, string) ([]provider.FileEntry, error) {
+	return nil, nil
+}
+func (f *fakeStore) ListPackages(context.Context, string) ([]string, error) { return nil, nil }
+
+func TestValidateUpload(t *testing.T) {
+	p := &Provider{}
+	for in, want := range map[string]string{
+		"mychart-0.1.0.tgz":        "mychart-0.1.0.tgz",
+		"charts/mychart-0.1.0.tgz": "mychart-0.1.0.tgz",
+		"../../mychart-0.1.0.tgz":  "mychart-0.1.0.tgz",
+	} {
+		sp, ct, err := p.ValidateUpload(in)
+		if err != nil || sp != want || ct != "application/gzip" {
+			t.Errorf("ValidateUpload(%q) = %q %q %v", in, sp, ct, err)
+		}
+	}
+	for _, bad := range []string{"index.yaml", "chart.tar.gz", ".tgz", ""} {
+		if _, _, err := p.ValidateUpload(bad); err == nil {
+			t.Errorf("ValidateUpload(%q) accepted", bad)
+		}
+	}
+}
+
+func TestAfterUploadParsesTopLevelChart(t *testing.T) {
+	data := chartTgz(t, map[string]string{
+		"mychart/charts/sub/Chart.yaml": "apiVersion: v2\nname: sub\nversion: 9.9.9\n",
+		"mychart/Chart.yaml":            "apiVersion: v2\nname: mychart\nversion: 1.0\ndescription: hi\n",
+		"mychart/values.yaml":           "a: 1\n",
+	})
+	store := &fakeStore{}
+	(&Provider{}).AfterUpload(context.Background(), "r", "mychart-1.0.tgz", "sha256:ab", fakeBlobs{data}, store)
+	m := store.inserted
+	if m == nil || m.Name != "mychart" || m.Version != "1.0" || m.FilePath != "mychart-1.0.tgz" || m.ContentHash != "sha256:ab" {
+		t.Fatalf("inserted %+v", m)
+	}
+}
+
+func TestAfterUploadRejectsChartWithoutMetadata(t *testing.T) {
+	store := &fakeStore{}
+	data := chartTgz(t, map[string]string{"mychart/Chart.yaml": "apiVersion: v2\nname: mychart\n"})
+	(&Provider{}).AfterUpload(context.Background(), "r", "x.tgz", "sha256:ab", fakeBlobs{data}, store)
+	if store.inserted != nil {
+		t.Fatal("chart without version was recorded")
+	}
+	(&Provider{}).AfterUpload(context.Background(), "r", "x.tgz", "sha256:ab", fakeBlobs{[]byte("not gzip")}, store)
+	if store.inserted != nil {
+		t.Fatal("non-gzip upload was recorded")
+	}
+}
+
+func TestServeLocalIndex(t *testing.T) {
+	t1 := time.Date(2026, 1, 1, 0, 0, 0, 0, time.UTC)
+	t2 := t1.Add(time.Hour)
+	store := &fakeStore{metas: []provider.HelmMetadata{
+		{FilePath: "mychart-1.0.tgz", ContentHash: "sha256:aa", Name: "mychart", Version: "1.0", CreatedAt: t1,
+			ChartYAML: "apiVersion: v2\nname: mychart\nversion: 1.0\nappVersion: \"2\"\ndescription: hi\n"},
+		{FilePath: "other-0.2.0.tgz", ContentHash: "sha256:bb", Name: "other", Version: "0.2.0", CreatedAt: t2,
+			ChartYAML: "apiVersion: v2\nname: other\nversion: 0.2.0\n"},
+	}}
+	p := &Provider{}
+
+	if p.ServeLocalIndex(httptest.NewRecorder(), httptest.NewRequest("GET", "/", nil), store, "r", "mychart-1.0.tgz") {
+		t.Fatal("chart path handled as index")
+	}
+	rec := httptest.NewRecorder()
+	if !p.ServeLocalIndex(rec, httptest.NewRequest("GET", "/", nil), store, "r", "./index.yaml") {
+		t.Fatal("index.yaml not handled")
+	}
+	if rec.Code != 200 || rec.Header().Get("Content-Type") != "text/yaml" {
+		t.Fatalf("code=%d ct=%q", rec.Code, rec.Header().Get("Content-Type"))
+	}
+
+	var idx struct {
+		APIVersion string `yaml:"apiVersion"`
+		Generated  string `yaml:"generated"`
+		Entries    map[string][]map[string]any
+	}
+	if err := yaml.Unmarshal(rec.Body.Bytes(), &idx); err != nil {
+		t.Fatal(err)
+	}
+	if idx.APIVersion != "v1" || idx.Generated != t2.Format(time.RFC3339Nano) {
+		t.Errorf("header %+v", idx)
+	}
+	e := idx.Entries["mychart"][0]
+	if e["digest"] != "aa" || e["description"] != "hi" || e["appVersion"] != "2" || e["apiVersion"] != "v2" {
+		t.Errorf("entry %v", e)
+	}
+	if urls, _ := e["urls"].([]any); len(urls) != 1 || urls[0] != "mychart-1.0.tgz" {
+		t.Errorf("urls %v", e["urls"])
+	}
+	if e["version"] != "1.0" || e["name"] != "mychart" {
+		t.Errorf("version must stay a string: %#v", e["version"])
+	}
+	if len(idx.Entries["other"]) != 1 {
+		t.Errorf("other entries %v", idx.Entries["other"])
+	}
+
+	again, err := p.GenerateLocalIndex(context.Background(), store, "r", "index.yaml")
+	if err != nil || !bytes.Equal(again, rec.Body.Bytes()) {
+		t.Errorf("index not deterministic: %v", err)
+	}
+}
+
+func TestAfterUploadRejectsFilenameMismatch(t *testing.T) {
+	store := &fakeStore{}
+	data := chartTgz(t, map[string]string{"mychart/Chart.yaml": "apiVersion: v2\nname: mychart\nversion: 1.0.0\n"})
+	(&Provider{}).AfterUpload(context.Background(), "r", "other-1.0.0.tgz", "sha256:ab", fakeBlobs{data}, store)
+	if store.inserted != nil {
+		t.Fatal("chart indexed under a filename that does not match name-version")
+	}
+}
+
+func TestParseChartLimits(t *testing.T) {
+	chart := "apiVersion: v2\nname: c\nversion: 1.0.0\n"
+	for name, tc := range map[string]struct {
+		files map[string]string
+		want  string
+	}{
+		"decompressed": {map[string]string{"c/a.bin": strings.Repeat("\x00", maxChartBytes+1)}, "decompressed bytes"},
+		"chart yaml":   {map[string]string{"c/Chart.yaml": chart + "#" + strings.Repeat("x", maxChartYAML)}, "Chart.yaml: exceeds"},
+	} {
+		_, err := parseChart(bytes.NewReader(chartTgz(t, tc.files)))
+		if err == nil || !strings.Contains(err.Error(), tc.want) {
+			t.Errorf("%s: err = %v, want %q", name, err, tc.want)
+		}
+	}
+
+	var buf bytes.Buffer
+	zw := gzip.NewWriter(&buf)
+	tw := tar.NewWriter(zw)
+	for i := 0; i <= maxChartEntries; i++ {
+		_ = tw.WriteHeader(&tar.Header{Name: "c/templates/" + strconv.Itoa(i), Mode: 0o644})
+	}
+	_ = tw.WriteHeader(&tar.Header{Name: "c/Chart.yaml", Mode: 0o644, Size: int64(len(chart))})
+	_, _ = tw.Write([]byte(chart))
+	_ = tw.Close()
+	_ = zw.Close()
+	if _, err := parseChart(&buf); err == nil || !strings.Contains(err.Error(), "entries") {
+		t.Errorf("entries: err = %v", err)
+	}
+
+	if m, err := parseChart(bytes.NewReader(chartTgz(t, map[string]string{"c/Chart.yaml": chart}))); err != nil || m.Name != "c" {
+		t.Errorf("valid chart: %v %v", m, err)
+	}
+}
+
+func TestIndexEscapesURLs(t *testing.T) {
+	out, err := generateIndex([]provider.HelmMetadata{{FilePath: "my chart-1.0.0.tgz", Name: "my chart", Version: "1.0.0", ChartYAML: "name: x\n"}})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !strings.Contains(string(out), "my%20chart-1.0.0.tgz") {
+		t.Errorf("url not escaped:\n%s", out)
+	}
+}
+
+func TestIndexExpandsAliasesBeforeOverride(t *testing.T) {
+	body, err := generateIndex([]provider.HelmMetadata{{
+		FilePath: "app-1.0.0.tgz", ContentHash: "sha256:aa", Name: "app", Version: "1.0.0",
+		ChartYAML: "apiVersion: v2\nname: app\nversion: &v 1.0.0\nappVersion: *v\n",
+	}})
+	if err != nil {
+		t.Fatal(err)
+	}
+	var idx struct {
+		Entries map[string][]map[string]any
+	}
+	if err := yaml.Unmarshal(body, &idx); err != nil {
+		t.Fatalf("index does not parse: %v\n%s", err, body)
+	}
+	if e := idx.Entries["app"]; len(e) != 1 || e[0]["appVersion"] != "1.0.0" {
+		t.Errorf("entries %v", idx.Entries)
+	}
+}

internal/provider/metadata_alpine.go

@@ -0,0 +1,49 @@
+package provider
+
+import (
+	"context"
+)
+
+// AlpineMetadataStore / AlpineMetadataDeleter / AlpineMetadataReader are the
+// Alpine-specific persistence surfaces. They are kept separate from the shared
+// RPM/Deb metadata interfaces so the apk provider can type-assert the generic
+// MetadataStore/MetadataDeleter/FileStore it is handed without widening (and
+// thus perturbing the test doubles of) the rpm and deb providers. *database.DB
+// satisfies all three.
+type AlpineMetadataStore interface {
+	InsertAlpineMetadata(ctx context.Context, meta *AlpineMetadata) error
+}
+
+type AlpineMetadataDeleter interface {
+	DeleteAlpineMetadata(ctx context.Context, repoName, filePath string) error
+}
+
+type AlpineMetadataReader interface {
+	ListAlpineMetadataEntries(ctx context.Context, repoName string) ([]AlpineMetadata, error)
+}
+
+// AlpineMetadata is the derived per-package metadata for an Alpine .apk, holding
+// the fields an APKINDEX record carries plus the apk pull checksum (Q1…, the
+// sha1 of the control gzip stream) and the download/installed sizes.
+type AlpineMetadata struct {
+	RepoName         string
+	FilePath         string
+	ContentHash      string
+	Checksum         string   // C: "Q1" + base64(sha1(control gzip stream))
+	Name             string   // P:
+	Version          string   // V:
+	Arch             string   // A:
+	DownloadSize     int64    // S: on-disk .apk size
+	InstalledSize    int64    // I: unpacked size from .PKGINFO
+	Description      string   // T:
+	URL              string   // U:
+	License          string   // L:
+	Origin           string   // o:
+	Maintainer       string   // m:
+	BuildTime        int64    // t:
+	Commit           string   // c:
+	ProviderPriority string   // k:
+	Depends          []string // D:
+	Provides         []string // p:
+	InstallIf        []string // i:
+}

internal/provider/metadata_deb.go

@@ -0,0 +1,34 @@
+package provider
+
+import (
+	"context"
+	"time"
+)
+
+// DebMetadataReader is the read surface the deb LocalIndexer needs to
+// regenerate a flat apt repository (Packages/Release) from stored rows.
+// *database.DB satisfies it; ServeLocalIndex type-asserts the FileStore to it,
+// mirroring how the rpm provider reaches its RPMMetadataReader.
+type DebMetadataReader interface {
+	ListDebMetadataEntries(ctx context.Context, repoName string) ([]DebMetadata, error)
+}
+
+// DebMetadata is the derived per-package metadata for a Debian .deb, carrying
+// the full raw control stanza so the Packages index can be regenerated
+// faithfully alongside the computed size/md5/sha256 apt requires.
+type DebMetadata struct {
+	RepoName     string
+	FilePath     string
+	ContentHash  string
+	Name         string
+	Version      string
+	Architecture string
+	Control      string
+	Size         int64
+	MD5          string
+	SHA256       string
+	// CreatedAt is the persisted insert time; the Release Date: is derived from
+	// the newest value so the index is byte-identical across replicas and
+	// regenerations (issue #117) rather than stamped from wall clock.
+	CreatedAt time.Time
+}

internal/provider/metadata_helm.go

@@ -0,0 +1,30 @@
+package provider
+
+import (
+	"context"
+	"time"
+)
+
+type HelmMetadataStore interface {
+	InsertHelmMetadata(ctx context.Context, meta *HelmMetadata) error
+}
+
+type HelmMetadataDeleter interface {
+	DeleteHelmMetadata(ctx context.Context, repoName, filePath string) error
+}
+
+type HelmMetadataReader interface {
+	ListHelmMetadataEntries(ctx context.Context, repoName string) ([]HelmMetadata, error)
+}
+
+// HelmMetadata is a local chart's Chart.yaml, kept verbatim so index.yaml
+// entries carry every field helm reads.
+type HelmMetadata struct {
+	RepoName    string
+	FilePath    string
+	ContentHash string
+	Name        string
+	Version     string
+	ChartYAML   string
+	CreatedAt   time.Time
+}

internal/provider/metadata_puppet.go

@@ -0,0 +1,32 @@
+package provider
+
+import (
+	"context"
+	"time"
+)
+
+type PuppetMetadataStore interface {
+	InsertPuppetMetadata(ctx context.Context, meta *PuppetMetadata) error
+}
+
+type PuppetMetadataDeleter interface {
+	DeletePuppetMetadata(ctx context.Context, repoName, filePath string) error
+}
+
+type PuppetMetadataReader interface {
+	ListPuppetMetadataEntries(ctx context.Context, repoName, slug string) ([]PuppetMetadata, error)
+}
+
+// PuppetMetadata is a local module release; MetadataJSON is the tarball's
+// metadata.json verbatim so Forge release objects carry every field.
+type PuppetMetadata struct {
+	RepoName     string
+	FilePath     string
+	ContentHash  string
+	Slug         string
+	Version      string
+	MetadataJSON string
+	Size         int64
+	MD5          string
+	CreatedAt    time.Time
+}

internal/provider/metadata_rpm.go

@@ -0,0 +1,60 @@
+package provider
+
+import (
+	"context"
+	"time"
+)
+
+type RPMMetadataReader interface {
+	ListRPMMetadataEntries(ctx context.Context, repoName string) ([]RPMMetadata, error)
+}
+
+type RPMMetadata struct {
+	RepoName      string
+	FilePath      string
+	ContentHash   string
+	Name          string
+	Epoch         int
+	Version       string
+	Release       string
+	Arch          string
+	Summary       string
+	Description   string
+	RPMSize       int64
+	InstalledSize int64
+	License       string
+	Vendor        string
+	Group         string
+	BuildHost     string
+	SourceRPM     string
+	URL           string
+	Packager      string
+	Requires      []RPMDep
+	Provides      []RPMDep
+	Conflicts     []RPMDep
+	Obsoletes     []RPMDep
+	Files         []RPMFile
+	Changelogs    []RPMChangelog
+	// CreatedAt is the persisted upload timestamp; used as a stable, replica-independent
+	// value for the repodata <time>/<revision> fields so generated indexes are deterministic.
+	CreatedAt time.Time
+}
+
+type RPMDep struct {
+	Name    string `json:"name"`
+	Flags   string `json:"flags,omitempty"`
+	Epoch   string `json:"epoch,omitempty"`
+	Version string `json:"version,omitempty"`
+	Release string `json:"release,omitempty"`
+}
+
+type RPMFile struct {
+	Path string `json:"path"`
+	Type string `json:"type,omitempty"`
+}
+
+type RPMChangelog struct {
+	Author string `json:"author"`
+	Date   int64  `json:"date"`
+	Text   string `json:"text"`
+}

internal/provider/metadata_store.go

@@ -0,0 +1,15 @@
+package provider
+
+import (
+	"context"
+)
+
+type MetadataStore interface {
+	InsertRPMMetadata(ctx context.Context, meta *RPMMetadata) error
+	InsertDebMetadata(ctx context.Context, meta *DebMetadata) error
+}
+
+type MetadataDeleter interface {
+	DeleteRPMMetadata(ctx context.Context, repoName, filePath string) error
+	DeleteDebMetadata(ctx context.Context, repoName, filePath string) error
+}

internal/provider/provider.go

@@ -3,9 +3,7 @@ package provider
 import (
 	"context"
 	"fmt"
-	"io"
 	"net/http"
-	"time"
 
 	"git.unkin.net/unkin/artifactapi/pkg/models"
 )
@@ -31,205 +29,6 @@ type FileEntry struct {
 	ContentHash string
 }
 
-type FileStore interface {
-	ListFilesByPrefix(ctx context.Context, repoName, prefix string) ([]FileEntry, error)
-	ListPackages(ctx context.Context, repoName string) ([]string, error)
-}
-
-type LocalUploader interface {
-	ValidateUpload(filePath string) (storagePath, contentType string, err error)
-	UploadResponse(storagePath, contentHash string, sizeBytes int64) map[string]any
-}
-
-type LocalIndexer interface {
-	ServeLocalIndex(w http.ResponseWriter, r *http.Request, files FileStore, repoName, path string) bool
-	GenerateLocalIndex(ctx context.Context, files FileStore, repoName, path string) ([]byte, error)
-}
-
-type BlobReader interface {
-	Download(ctx context.Context, key string) (io.ReadCloser, int64, error)
-}
-
-type PostUploadHook interface {
-	AfterUpload(ctx context.Context, repoName, storagePath, contentHash string, blobs BlobReader, db MetadataStore)
-}
-
-// PostDeleteHook lets a provider clean up derived state (e.g. RPM metadata that
-// feeds generated repodata) after a local file is removed.
-type PostDeleteHook interface {
-	AfterDelete(ctx context.Context, repoName, storagePath string, db MetadataDeleter) error
-}
-
-type MetadataStore interface {
-	InsertRPMMetadata(ctx context.Context, meta *RPMMetadata) error
-	InsertDebMetadata(ctx context.Context, meta *DebMetadata) error
-}
-
-// RemoteServer lets a remote provider fully answer a request itself instead of
-// going through the byte-proxy engine. It is the remote-side analog of
-// LocalIndexer: a metadata-only remote (e.g. github_rpm) uses it to synthesize
-// repodata from derived per-asset metadata and to redirect package downloads to
-// a backend remote, without ever precaching the packages. Returning false lets
-// the normal proxy path take over.
-type RemoteServer interface {
-	ServeRemote(w http.ResponseWriter, r *http.Request, remote models.Remote, path, proxyBaseURL string, store RemoteMetadataStore) bool
-}
-
-// ServeRewriter rewrites a cached mutable remote response per request, for
-// indexes whose URLs must name the requesting host and so cannot be rewritten
-// before caching.
-type ServeRewriter interface {
-	RewriteServed(body []byte, remote models.Remote, proxyBaseURL string) []byte
-}
-
-// RemoteMetadataStore is the persistence surface a RemoteServer needs to cache
-// and read the metadata it derives per upstream asset. *database.DB satisfies it.
-type RemoteMetadataStore interface {
-	RPMMetadataReader
-	MetadataStore
-	MetadataDeleter
-}
-
-type MetadataDeleter interface {
-	DeleteRPMMetadata(ctx context.Context, repoName, filePath string) error
-	DeleteDebMetadata(ctx context.Context, repoName, filePath string) error
-}
-
-type RPMMetadataReader interface {
-	ListRPMMetadataEntries(ctx context.Context, repoName string) ([]RPMMetadata, error)
-}
-
-// DebMetadataReader is the read surface the deb LocalIndexer needs to
-// regenerate a flat apt repository (Packages/Release) from stored rows.
-// *database.DB satisfies it; ServeLocalIndex type-asserts the FileStore to it,
-// mirroring how the rpm provider reaches its RPMMetadataReader.
-type DebMetadataReader interface {
-	ListDebMetadataEntries(ctx context.Context, repoName string) ([]DebMetadata, error)
-}
-
-// DebMetadata is the derived per-package metadata for a Debian .deb, carrying
-// the full raw control stanza so the Packages index can be regenerated
-// faithfully alongside the computed size/md5/sha256 apt requires.
-type DebMetadata struct {
-	RepoName     string
-	FilePath     string
-	ContentHash  string
-	Name         string
-	Version      string
-	Architecture string
-	Control      string
-	Size         int64
-	MD5          string
-	SHA256       string
-	// CreatedAt is the persisted insert time; the Release Date: is derived from
-	// the newest value so the index is byte-identical across replicas and
-	// regenerations (issue #117) rather than stamped from wall clock.
-	CreatedAt time.Time
-}
-
-// AlpineMetadataStore / AlpineMetadataDeleter / AlpineMetadataReader are the
-// Alpine-specific persistence surfaces. They are kept separate from the shared
-// RPM/Deb metadata interfaces so the apk provider can type-assert the generic
-// MetadataStore/MetadataDeleter/FileStore it is handed without widening (and
-// thus perturbing the test doubles of) the rpm and deb providers. *database.DB
-// satisfies all three.
-type AlpineMetadataStore interface {
-	InsertAlpineMetadata(ctx context.Context, meta *AlpineMetadata) error
-}
-
-type AlpineMetadataDeleter interface {
-	DeleteAlpineMetadata(ctx context.Context, repoName, filePath string) error
-}
-
-type AlpineMetadataReader interface {
-	ListAlpineMetadataEntries(ctx context.Context, repoName string) ([]AlpineMetadata, error)
-}
-
-// AlpineMetadata is the derived per-package metadata for an Alpine .apk, holding
-// the fields an APKINDEX record carries plus the apk pull checksum (Q1…, the
-// sha1 of the control gzip stream) and the download/installed sizes.
-type AlpineMetadata struct {
-	RepoName         string
-	FilePath         string
-	ContentHash      string
-	Checksum         string   // C: "Q1" + base64(sha1(control gzip stream))
-	Name             string   // P:
-	Version          string   // V:
-	Arch             string   // A:
-	DownloadSize     int64    // S: on-disk .apk size
-	InstalledSize    int64    // I: unpacked size from .PKGINFO
-	Description      string   // T:
-	URL              string   // U:
-	License          string   // L:
-	Origin           string   // o:
-	Maintainer       string   // m:
-	BuildTime        int64    // t:
-	Commit           string   // c:
-	ProviderPriority string   // k:
-	Depends          []string // D:
-	Provides         []string // p:
-	InstallIf        []string // i:
-}
-
-type RPMMetadata struct {
-	RepoName      string
-	FilePath      string
-	ContentHash   string
-	Name          string
-	Epoch         int
-	Version       string
-	Release       string
-	Arch          string
-	Summary       string
-	Description   string
-	RPMSize       int64
-	InstalledSize int64
-	License       string
-	Vendor        string
-	Group         string
-	BuildHost     string
-	SourceRPM     string
-	URL           string
-	Packager      string
-	Requires      []RPMDep
-	Provides      []RPMDep
-	Conflicts     []RPMDep
-	Obsoletes     []RPMDep
-	Files         []RPMFile
-	Changelogs    []RPMChangelog
-	// CreatedAt is the persisted upload timestamp; used as a stable, replica-independent
-	// value for the repodata <time>/<revision> fields so generated indexes are deterministic.
-	CreatedAt time.Time
-}
-
-type RPMDep struct {
-	Name    string `json:"name"`
-	Flags   string `json:"flags,omitempty"`
-	Epoch   string `json:"epoch,omitempty"`
-	Version string `json:"version,omitempty"`
-	Release string `json:"release,omitempty"`
-}
-
-type RPMFile struct {
-	Path string `json:"path"`
-	Type string `json:"type,omitempty"`
-}
-
-type RPMChangelog struct {
-	Author string `json:"author"`
-	Date   int64  `json:"date"`
-	Text   string `json:"text"`
-}
-
-type IndexMerger interface {
-	MergeIndexes(members []MemberIndex, proxyBaseURL string) ([]byte, error)
-}
-
-type MemberIndex struct {
-	RemoteName string
-	Body       []byte
-}
-
 var registry = map[models.PackageType]Provider{}
 
 func Register(p Provider) {

internal/provider/puppet/local.go

@@ -0,0 +1,393 @@
+package puppet
+
+import (
+	"archive/tar"
+	"compress/gzip"
+	"context"
+	"crypto/md5"
+	"encoding/hex"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"log/slog"
+	"net/http"
+	"net/url"
+	"path"
+	"regexp"
+	"slices"
+	"strconv"
+	"strings"
+
+	"git.unkin.net/unkin/artifactapi/internal/provider"
+	"git.unkin.net/unkin/artifactapi/internal/storage"
+)
+
+const filesPrefix = "v3/files/"
+
+// releaseRe matches <owner>-<name>-<semver>, the Forge release slug and the
+// tarball basename that `puppet module build` produces.
+var releaseRe = regexp.MustCompile(`^([a-z0-9]+)-([a-z][a-z0-9_]*)-(\d+\.\d+\.\d+(?:-[0-9a-z.-]+)?(?:\+[0-9a-z.-]+)?)$`)
+
+func parseRelease(s string) (slug, version string, ok bool) {
+	m := releaseRe.FindStringSubmatch(strings.ToLower(s))
+	if m == nil {
+		return "", "", false
+	}
+	return m[1] + "-" + m[2], m[3], true
+}
+
+func normalizeSlug(s string) string {
+	return strings.ToLower(strings.ReplaceAll(s, "/", "-"))
+}
+
+// ValidateUpload stores tarballs under v3/files/ so Forge file_uri downloads
+// resolve straight to the stored file.
+func (p *Provider) ValidateUpload(filePath string) (storagePath, contentType string, err error) {
+	filename := strings.ToLower(path.Base(path.Clean("/" + filePath)))
+	if _, _, ok := parseRelease(strings.TrimSuffix(filename, ".tar.gz")); !ok || !strings.HasSuffix(filename, ".tar.gz") {
+		return "", "", fmt.Errorf("file must be named <owner>-<module>-<version>.tar.gz")
+	}
+	return filesPrefix + filename, "application/gzip", nil
+}
+
+func (p *Provider) UploadResponse(storagePath, contentHash string, sizeBytes int64) map[string]any {
+	return map[string]any{
+		"filename":     path.Base(storagePath),
+		"content_hash": contentHash,
+		"size_bytes":   sizeBytes,
+	}
+}
+
+func (p *Provider) AfterUpload(ctx context.Context, repoName, storagePath, contentHash string, blobs provider.BlobReader, db provider.MetadataStore) {
+	reader, size, err := blobs.Download(ctx, storage.BlobKey(strings.TrimPrefix(contentHash, "sha256:")))
+	if err != nil {
+		slog.Error("puppet metadata: download failed", "repo", repoName, "path", storagePath, "error", err)
+		return
+	}
+	defer func() { _ = reader.Close() }()
+	if size > maxModuleTarball {
+		slog.Error("puppet metadata: tarball too large", "repo", repoName, "path", storagePath, "size", size)
+		return
+	}
+
+	hash := md5.New()
+	src := io.TeeReader(io.LimitReader(reader, maxModuleTarball), hash)
+	meta, err := parseModule(src)
+	if err != nil {
+		slog.Error("puppet metadata: parse failed", "repo", repoName, "path", storagePath, "error", err)
+		return
+	}
+	if _, err := io.Copy(io.Discard, src); err != nil {
+		slog.Error("puppet metadata: read failed", "repo", repoName, "path", storagePath, "error", err)
+		return
+	}
+	slug, version, _ := parseRelease(strings.TrimSuffix(path.Base(storagePath), ".tar.gz"))
+	if meta.Slug != slug || meta.Version != version {
+		slog.Error("puppet metadata: metadata.json does not match filename", "repo", repoName, "path", storagePath, "name", meta.Slug, "version", meta.Version)
+		return
+	}
+	meta.RepoName = repoName
+	meta.FilePath = storagePath
+	meta.ContentHash = contentHash
+	meta.Size = size
+	meta.MD5 = hex.EncodeToString(hash.Sum(nil))
+
+	store, ok := db.(provider.PuppetMetadataStore)
+	if !ok {
+		slog.Error("puppet metadata: store does not support puppet metadata", "repo", repoName)
+		return
+	}
+	if err := store.InsertPuppetMetadata(ctx, meta); err != nil {
+		slog.Error("puppet metadata: insert failed", "repo", repoName, "path", storagePath, "error", err)
+		return
+	}
+	slog.Info("puppet metadata: parsed", "repo", repoName, "module", meta.Slug, "version", meta.Version)
+}
+
+func (p *Provider) AfterDelete(ctx context.Context, repoName, storagePath string, db provider.MetadataDeleter) error {
+	deleter, ok := db.(provider.PuppetMetadataDeleter)
+	if !ok {
+		return nil
+	}
+	return deleter.DeletePuppetMetadata(ctx, repoName, storagePath)
+}
+
+const maxMetadataJSON = 1 << 20
+
+var (
+	maxModuleTarball int64 = 100 << 20
+	maxModuleScan    int64 = 200 << 20
+)
+
+// parseModule reads the top-level <dir>/metadata.json from a module tarball,
+// scanning at most maxModuleScan decompressed bytes.
+func parseModule(r io.Reader) (*provider.PuppetMetadata, error) {
+	zr, err := gzip.NewReader(r)
+	if err != nil {
+		return nil, err
+	}
+	scan := &io.LimitedReader{R: zr, N: maxModuleScan}
+	tr := tar.NewReader(scan)
+	for {
+		hdr, err := tr.Next()
+		if scan.N <= 0 {
+			return nil, errors.New("module tarball exceeds decompressed scan limit before metadata.json")
+		}
+		if err == io.EOF {
+			return nil, errors.New("no metadata.json in module tarball")
+		}
+		if err != nil {
+			return nil, err
+		}
+		dir, file := path.Split(strings.TrimPrefix(path.Clean(hdr.Name), "./"))
+		if hdr.Typeflag != tar.TypeReg || file != "metadata.json" || strings.Count(dir, "/") != 1 {
+			continue
+		}
+		body, err := io.ReadAll(io.LimitReader(tr, maxMetadataJSON))
+		if err != nil {
+			return nil, err
+		}
+		var md struct {
+			Name    string `json:"name"`
+			Version string `json:"version"`
+		}
+		if err := json.Unmarshal(body, &md); err != nil {
+			return nil, fmt.Errorf("parse metadata.json: %w", err)
+		}
+		if md.Name == "" || md.Version == "" {
+			return nil, errors.New("metadata.json missing name or version")
+		}
+		return &provider.PuppetMetadata{Slug: normalizeSlug(md.Name), Version: md.Version, MetadataJSON: string(body)}, nil
+	}
+}
+
+func (p *Provider) ServeLocalIndex(w http.ResponseWriter, r *http.Request, files provider.FileStore, repoName, reqPath string) bool {
+	clean := strings.TrimPrefix(path.Clean("/"+reqPath), "/")
+	var list func(slug string) ([]provider.PuppetMetadata, error)
+	if reader, ok := files.(provider.PuppetMetadataReader); ok {
+		list = func(slug string) ([]provider.PuppetMetadata, error) {
+			metas, err := reader.ListPuppetMetadataEntries(r.Context(), repoName, slug)
+			sortReleases(metas)
+			return metas, err
+		}
+	} else {
+		list = func(string) ([]provider.PuppetMetadata, error) {
+			return nil, errors.New("puppet metadata not available")
+		}
+	}
+
+	switch {
+	case clean == "v3/releases":
+		serveReleaseList(w, r, list)
+	case strings.HasPrefix(clean, "v3/releases/"):
+		slug, version, ok := parseRelease(strings.TrimPrefix(clean, "v3/releases/"))
+		if !ok {
+			notFound(w)
+			return true
+		}
+		metas, err := list(slug)
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return true
+		}
+		for _, m := range metas {
+			if m.Version == version {
+				writeJSON(w, releaseObject(m))
+				return true
+			}
+		}
+		notFound(w)
+	case strings.HasPrefix(clean, "v3/modules/"):
+		slug := normalizeSlug(strings.TrimPrefix(clean, "v3/modules/"))
+		metas, err := list(slug)
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return true
+		}
+		if len(metas) == 0 {
+			notFound(w)
+			return true
+		}
+		writeJSON(w, moduleObject(metas))
+	default:
+		return false
+	}
+	return true
+}
+
+func (p *Provider) GenerateLocalIndex(ctx context.Context, files provider.FileStore, repoName, path string) ([]byte, error) {
+	return nil, fmt.Errorf("puppet local index generation for virtual repos not supported")
+}
+
+func serveReleaseList(w http.ResponseWriter, r *http.Request, list func(string) ([]provider.PuppetMetadata, error)) {
+	q := r.URL.Query()
+	slug := normalizeSlug(q.Get("module"))
+	limit, err := strconv.Atoi(q.Get("limit"))
+	if err != nil || limit <= 0 {
+		limit = 20
+	}
+	limit = min(limit, 100)
+	offset, err := strconv.Atoi(q.Get("offset"))
+	if err != nil || offset < 0 {
+		offset = 0
+	}
+
+	metas, err := list(slug)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	offset = min(offset, len(metas))
+	results := []map[string]any{}
+	for _, m := range metas[offset : offset+min(limit, len(metas)-offset)] {
+		results = append(results, releaseObject(m))
+	}
+
+	page := func(off int) any {
+		if off < 0 || off >= len(metas) && off != 0 {
+			return nil
+		}
+		v := url.Values{"limit": {strconv.Itoa(limit)}, "offset": {strconv.Itoa(off)}}
+		if slug != "" {
+			v.Set("module", slug)
+		}
+		return "/v3/releases?" + v.Encode()
+	}
+	var previous any
+	if offset > 0 {
+		previous = page(max(offset-limit, 0))
+	}
+	writeJSON(w, map[string]any{
+		"pagination": map[string]any{
+			"limit":    limit,
+			"offset":   offset,
+			"first":    page(0),
+			"previous": previous,
+			"current":  page(offset),
+			"next":     page(offset + limit),
+			"total":    len(metas),
+		},
+		"results": results,
+	})
+}
+
+func owner(slug string) map[string]any {
+	name, _, _ := strings.Cut(slug, "-")
+	return map[string]any{"uri": "/v3/users/" + name, "slug": name, "username": name}
+}
+
+func moduleRef(slug string) map[string]any {
+	_, name, _ := strings.Cut(slug, "-")
+	return map[string]any{"uri": "/v3/modules/" + slug, "slug": slug, "name": name, "deprecated_at": nil, "owner": owner(slug)}
+}
+
+const forgeTime = "2006-01-02 15:04:05 -0700"
+
+func releaseObject(m provider.PuppetMetadata) map[string]any {
+	slug := m.Slug + "-" + m.Version
+	return map[string]any{
+		"uri":         "/v3/releases/" + slug,
+		"slug":        slug,
+		"module":      moduleRef(m.Slug),
+		"version":     m.Version,
+		"metadata":    json.RawMessage(m.MetadataJSON),
+		"tags":        []string{},
+		"supported":   false,
+		"pdk":         false,
+		"file_uri":    "/" + m.FilePath,
+		"file_size":   m.Size,
+		"file_md5":    m.MD5,
+		"file_sha256": strings.TrimPrefix(m.ContentHash, "sha256:"),
+		"downloads":   0,
+		"readme":      nil,
+		"changelog":   nil,
+		"license":     nil,
+		"created_at":  m.CreatedAt.Format(forgeTime),
+		"updated_at":  m.CreatedAt.Format(forgeTime),
+		"deleted_at":  nil,
+	}
+}
+
+// moduleObject expects metas sorted newest version first.
+func moduleObject(metas []provider.PuppetMetadata) map[string]any {
+	obj := moduleRef(metas[0].Slug)
+	releases := make([]map[string]any, 0, len(metas))
+	for _, m := range metas {
+		slug := m.Slug + "-" + m.Version
+		releases = append(releases, map[string]any{
+			"uri": "/v3/releases/" + slug, "slug": slug, "version": m.Version,
+			"file_uri": "/" + m.FilePath, "file_size": m.Size, "supported": false,
+			"created_at": m.CreatedAt.Format(forgeTime), "deleted_at": nil,
+		})
+	}
+	obj["current_release"] = releaseObject(metas[0])
+	obj["releases"] = releases
+	obj["downloads"] = 0
+	obj["created_at"] = metas[len(metas)-1].CreatedAt.Format(forgeTime)
+	obj["updated_at"] = metas[0].CreatedAt.Format(forgeTime)
+	return obj
+}
+
+func writeJSON(w http.ResponseWriter, v any) {
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(http.StatusOK)
+	enc := json.NewEncoder(w)
+	enc.SetEscapeHTML(false)
+	_ = enc.Encode(v)
+}
+
+func notFound(w http.ResponseWriter) {
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(http.StatusNotFound)
+	_, _ = io.WriteString(w, `{"message":"404 Not Found","errors":["The requested resource could not be found"]}`)
+}
+
+// sortReleases orders by module slug, then newest semver first.
+func sortReleases(metas []provider.PuppetMetadata) {
+	slices.SortStableFunc(metas, func(a, b provider.PuppetMetadata) int {
+		if c := strings.Compare(a.Slug, b.Slug); c != 0 {
+			return c
+		}
+		return compareSemver(b.Version, a.Version)
+	})
+}
+
+func compareSemver(a, b string) int {
+	a, _, _ = strings.Cut(a, "+")
+	b, _, _ = strings.Cut(b, "+")
+	aCore, aPre, aHasPre := strings.Cut(a, "-")
+	bCore, bPre, bHasPre := strings.Cut(b, "-")
+	if c := compareIdents(strings.Split(aCore, "."), strings.Split(bCore, ".")); c != 0 {
+		return c
+	}
+	switch {
+	case aHasPre && !bHasPre:
+		return -1
+	case !aHasPre && bHasPre:
+		return 1
+	}
+	return compareIdents(strings.Split(aPre, "."), strings.Split(bPre, "."))
+}
+
+func compareIdents(a, b []string) int {
+	for i := 0; i < len(a) && i < len(b); i++ {
+		an, aErr := strconv.Atoi(a[i])
+		bn, bErr := strconv.Atoi(b[i])
+		var c int
+		switch {
+		case aErr == nil && bErr == nil:
+			c = an - bn
+		case aErr == nil:
+			c = -1
+		case bErr == nil:
+			c = 1
+		default:
+			c = strings.Compare(a[i], b[i])
+		}
+		if c != 0 {
+			return c
+		}
+	}
+	return len(a) - len(b)
+}

internal/provider/puppet/local_test.go

@@ -0,0 +1,301 @@
+package puppet
+
+import (
+	"archive/tar"
+	"bytes"
+	"compress/gzip"
+	"context"
+	"crypto/md5"
+	"encoding/hex"
+	"encoding/json"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+	"time"
+
+	"git.unkin.net/unkin/artifactapi/internal/provider"
+)
+
+func moduleTarball(t *testing.T, dir, metadata string) []byte {
+	t.Helper()
+	var buf bytes.Buffer
+	zw := gzip.NewWriter(&buf)
+	tw := tar.NewWriter(zw)
+	for name, body := range map[string]string{dir + "/metadata.json": metadata, dir + "/manifests/init.pp": "class hello {}\n"} {
+		if err := tw.WriteHeader(&tar.Header{Name: name, Mode: 0o644, Size: int64(len(body))}); err != nil {
+			t.Fatal(err)
+		}
+		_, _ = tw.Write([]byte(body))
+	}
+	_ = tw.Close()
+	_ = zw.Close()
+	return buf.Bytes()
+}
+
+const helloMetadata = `{"name":"unkin-hello","version":"0.1.0","dependencies":[{"name":"puppetlabs/stdlib","version_requirement":">= 4.0.0"}]}`
+
+type fakeBlobs struct{ data []byte }
+
+func (f fakeBlobs) Download(context.Context, string) (io.ReadCloser, int64, error) {
+	return io.NopCloser(bytes.NewReader(f.data)), int64(len(f.data)), nil
+}
+
+type fakeStore struct{ inserted *provider.PuppetMetadata }
+
+func (f *fakeStore) InsertRPMMetadata(context.Context, *provider.RPMMetadata) error { return nil }
+func (f *fakeStore) InsertDebMetadata(context.Context, *provider.DebMetadata) error { return nil }
+func (f *fakeStore) InsertPuppetMetadata(_ context.Context, m *provider.PuppetMetadata) error {
+	f.inserted = m
+	return nil
+}
+
+type fakeReader struct{ metas []provider.PuppetMetadata }
+
+func (f fakeReader) ListPuppetMetadataEntries(_ context.Context, _, slug string) ([]provider.PuppetMetadata, error) {
+	var out []provider.PuppetMetadata
+	for _, m := range f.metas {
+		if slug == "" || m.Slug == slug {
+			out = append(out, m)
+		}
+	}
+	return out, nil
+}
+func (fakeReader) ListFilesByPrefix(context.Context, string, string) ([]provider.FileEntry, error) {
+	return nil, nil
+}
+func (fakeReader) ListPackages(context.Context, string) ([]string, error) { return nil, nil }
+
+func TestValidateUpload(t *testing.T) {
+	p := &Provider{}
+	sp, ct, err := p.ValidateUpload("some/dir/Unkin-hello-0.1.0.tar.gz")
+	if err != nil || sp != "v3/files/unkin-hello-0.1.0.tar.gz" || ct != "application/gzip" {
+		t.Errorf("sp=%q ct=%q err=%v", sp, ct, err)
+	}
+	for _, bad := range []string{"hello-0.1.0.tar.gz", "unkin-hello-0.1.tar.gz", "unkin-hello-0.1.0.zip", "unkin-Hello_x-0.1.0.tgz"} {
+		if _, _, err := p.ValidateUpload(bad); err == nil {
+			t.Errorf("%q accepted", bad)
+		}
+	}
+}
+
+func TestAfterUploadRecordsMetadata(t *testing.T) {
+	raw := moduleTarball(t, "unkin-hello-0.1.0", helloMetadata)
+	store := &fakeStore{}
+	(&Provider{}).AfterUpload(context.Background(), "forge", "v3/files/unkin-hello-0.1.0.tar.gz", "sha256:abc", fakeBlobs{raw}, store)
+	m := store.inserted
+	if m == nil {
+		t.Fatal("nothing inserted")
+	}
+	sum := md5.Sum(raw)
+	if m.Slug != "unkin-hello" || m.Version != "0.1.0" || m.MD5 != hex.EncodeToString(sum[:]) || m.Size != int64(len(raw)) || m.MetadataJSON != helloMetadata {
+		t.Errorf("got %+v", m)
+	}
+}
+
+func TestAfterUploadRejectsMismatchedFilename(t *testing.T) {
+	raw := moduleTarball(t, "unkin-hello-0.2.0", `{"name":"unkin-hello","version":"0.2.0"}`)
+	store := &fakeStore{}
+	(&Provider{}).AfterUpload(context.Background(), "forge", "v3/files/unkin-hello-0.1.0.tar.gz", "sha256:abc", fakeBlobs{raw}, store)
+	if store.inserted != nil {
+		t.Error("mismatched version indexed")
+	}
+}
+
+func TestParseModuleRequiresTopLevelMetadata(t *testing.T) {
+	if _, err := parseModule(bytes.NewReader(moduleTarball(t, "a/b", helloMetadata))); err == nil {
+		t.Error("nested metadata.json accepted")
+	}
+	if _, err := parseModule(bytes.NewReader(moduleTarball(t, "x", `{"name":"unkin-hello"}`))); err == nil {
+		t.Error("missing version accepted")
+	}
+}
+
+func tarballOf(t *testing.T, entries ...*tar.Header) []byte {
+	t.Helper()
+	var buf bytes.Buffer
+	zw := gzip.NewWriter(&buf)
+	tw := tar.NewWriter(zw)
+	for _, h := range entries {
+		if err := tw.WriteHeader(h); err != nil {
+			t.Fatal(err)
+		}
+		if h.Typeflag == tar.TypeReg {
+			body := helloMetadata
+			if !strings.HasSuffix(h.Name, "metadata.json") {
+				body = strings.Repeat("x", int(h.Size))
+			}
+			_, _ = tw.Write([]byte(body))
+		}
+	}
+	_ = tw.Close()
+	_ = zw.Close()
+	return buf.Bytes()
+}
+
+func TestParseModuleSkipsNonRegularMetadata(t *testing.T) {
+	raw := tarballOf(t,
+		&tar.Header{Name: "unkin-hello-0.1.0/metadata.json", Typeflag: tar.TypeSymlink, Linkname: "/etc/passwd"},
+		&tar.Header{Name: "unkin-hello-0.1.0/metadata.json/", Typeflag: tar.TypeDir, Mode: 0o755},
+		&tar.Header{Name: "unkin-hello-0.1.0/metadata.json", Typeflag: tar.TypeReg, Mode: 0o644, Size: int64(len(helloMetadata))},
+	)
+	meta, err := parseModule(bytes.NewReader(raw))
+	if err != nil || meta.Slug != "unkin-hello" || meta.Version != "0.1.0" {
+		t.Fatalf("got %v, %v", meta, err)
+	}
+}
+
+func TestParseModuleCapsDecompressedScan(t *testing.T) {
+	defer func(n int64) { maxModuleScan = n }(maxModuleScan)
+	maxModuleScan = 64 << 10
+	raw := tarballOf(t,
+		&tar.Header{Name: "unkin-hello-0.1.0/big", Typeflag: tar.TypeReg, Mode: 0o644, Size: 1 << 20},
+		&tar.Header{Name: "unkin-hello-0.1.0/metadata.json", Typeflag: tar.TypeReg, Mode: 0o644, Size: int64(len(helloMetadata))},
+	)
+	if _, err := parseModule(bytes.NewReader(raw)); err == nil || !strings.Contains(err.Error(), "scan limit") {
+		t.Fatalf("expected scan limit error, got %v", err)
+	}
+	maxModuleScan = 2 << 20
+	if _, err := parseModule(bytes.NewReader(raw)); err != nil {
+		t.Fatalf("under cap: %v", err)
+	}
+}
+
+func TestAfterUploadCapsTarballSize(t *testing.T) {
+	defer func(n int64) { maxModuleTarball = n }(maxModuleTarball)
+	raw := moduleTarball(t, "unkin-hello-0.1.0", helloMetadata)
+	maxModuleTarball = int64(len(raw)) - 1
+	store := &fakeStore{}
+	(&Provider{}).AfterUpload(context.Background(), "forge", "v3/files/unkin-hello-0.1.0.tar.gz", "sha256:abc", fakeBlobs{raw}, store)
+	if store.inserted != nil {
+		t.Error("oversized tarball indexed")
+	}
+	maxModuleTarball = int64(len(raw))
+	(&Provider{}).AfterUpload(context.Background(), "forge", "v3/files/unkin-hello-0.1.0.tar.gz", "sha256:abc", fakeBlobs{raw}, store)
+	if store.inserted == nil {
+		t.Error("tarball at cap not indexed")
+	}
+}
+
+func TestReleaseListClampsPagination(t *testing.T) {
+	files := releases("0.1.0", "0.2.0", "0.3.0")
+	for _, q := range []string{"offset=9223372036854775807", "offset=9223372036854775807&limit=9223372036854775807", "offset=-5&limit=-5", "limit=9223372036854775807"} {
+		code, body := get(t, files, "v3/releases?module=unkin-hello&"+q)
+		if code != http.StatusOK {
+			t.Fatalf("%s: code %d", q, code)
+		}
+		pg := body["pagination"].(map[string]any)
+		if l := pg["limit"].(float64); l < 1 || l > 100 {
+			t.Errorf("%s: limit %v", q, l)
+		}
+		if o := pg["offset"].(float64); o < 0 || o > 3 {
+			t.Errorf("%s: offset %v", q, o)
+		}
+	}
+	_, body := get(t, files, "v3/releases?module=unkin-hello&offset=9223372036854775807")
+	if len(body["results"].([]any)) != 0 || body["pagination"].(map[string]any)["next"] != nil {
+		t.Errorf("past-end page: %v", body)
+	}
+}
+
+func get(t *testing.T, files provider.FileStore, target string) (int, map[string]any) {
+	t.Helper()
+	rec := httptest.NewRecorder()
+	req := httptest.NewRequest(http.MethodGet, "/x/"+target, nil)
+	path, _, _ := strings.Cut(target, "?")
+	if !(&Provider{}).ServeLocalIndex(rec, req, files, "forge", path) {
+		return 0, nil
+	}
+	var body map[string]any
+	_ = json.Unmarshal(rec.Body.Bytes(), &body)
+	return rec.Code, body
+}
+
+func releases(versions ...string) fakeReader {
+	var f fakeReader
+	for i, v := range versions {
+		f.metas = append(f.metas, provider.PuppetMetadata{
+			FilePath: "v3/files/unkin-hello-" + v + ".tar.gz", ContentHash: "sha256:feed", Slug: "unkin-hello",
+			Version: v, MetadataJSON: `{"name":"unkin-hello","version":"` + v + `"}`, MD5: "m" + v,
+			CreatedAt: time.Unix(int64(i), 0),
+		})
+	}
+	f.metas = append(f.metas, provider.PuppetMetadata{Slug: "other-mod", Version: "9.9.9", MetadataJSON: `{}`})
+	return f
+}
+
+func TestReleaseListPaginatesNewestFirst(t *testing.T) {
+	files := releases("0.1.0", "0.10.0", "0.2.0", "1.0.0-rc.1", "1.0.0")
+	code, body := get(t, files, "v3/releases?module=unkin/hello&limit=2")
+	if code != http.StatusOK {
+		t.Fatalf("code %d", code)
+	}
+	results := body["results"].([]any)
+	pg := body["pagination"].(map[string]any)
+	if len(results) != 2 || results[0].(map[string]any)["version"] != "1.0.0" || results[1].(map[string]any)["version"] != "1.0.0-rc.1" {
+		t.Fatalf("page 1: %v", results)
+	}
+	if pg["total"] != float64(5) || pg["next"] != "/v3/releases?limit=2&module=unkin-hello&offset=2" || pg["previous"] != nil {
+		t.Errorf("pagination: %v", pg)
+	}
+
+	_, body = get(t, files, "v3/releases?module=unkin-hello&limit=2&offset=4")
+	results = body["results"].([]any)
+	pg = body["pagination"].(map[string]any)
+	if len(results) != 1 || results[0].(map[string]any)["version"] != "0.1.0" || pg["next"] != nil || pg["previous"] != "/v3/releases?limit=2&module=unkin-hello&offset=2" {
+		t.Errorf("last page: %v %v", results, pg)
+	}
+
+	_, body = get(t, files, "v3/releases?module=nobody-none")
+	if len(body["results"].([]any)) != 0 {
+		t.Error("unknown module returned results")
+	}
+}
+
+func TestReleaseObject(t *testing.T) {
+	code, body := get(t, releases("0.1.0"), "v3/releases/unkin-hello-0.1.0")
+	if code != http.StatusOK {
+		t.Fatalf("code %d", code)
+	}
+	if body["file_uri"] != "/v3/files/unkin-hello-0.1.0.tar.gz" || body["file_md5"] != "m0.1.0" || body["file_sha256"] != "feed" {
+		t.Errorf("release: %v", body)
+	}
+	if body["metadata"].(map[string]any)["name"] != "unkin-hello" || body["module"].(map[string]any)["owner"].(map[string]any)["username"] != "unkin" {
+		t.Errorf("release refs: %v", body)
+	}
+	if code, _ := get(t, releases("0.1.0"), "v3/releases/unkin-hello-0.2.0"); code != http.StatusNotFound {
+		t.Errorf("missing version: %d", code)
+	}
+}
+
+func TestModuleObject(t *testing.T) {
+	code, body := get(t, releases("0.9.0", "0.10.0"), "v3/modules/unkin-hello")
+	if code != http.StatusOK {
+		t.Fatalf("code %d", code)
+	}
+	if body["slug"] != "unkin-hello" || body["name"] != "hello" || body["current_release"].(map[string]any)["version"] != "0.10.0" || len(body["releases"].([]any)) != 2 {
+		t.Errorf("module: %v", body)
+	}
+	if code, _ := get(t, releases(), "v3/modules/unkin-missing"); code != http.StatusNotFound {
+		t.Errorf("missing module: %d", code)
+	}
+}
+
+func TestFilesFallThrough(t *testing.T) {
+	if code, _ := get(t, releases(), "v3/files/unkin-hello-0.1.0.tar.gz"); code != 0 {
+		t.Error("file downloads must fall through to the stored file")
+	}
+}
+
+func TestCompareSemver(t *testing.T) {
+	ordered := []string{"0.1.0", "0.2.0", "0.10.0", "1.0.0-alpha", "1.0.0-alpha.1", "1.0.0-beta", "1.0.0-beta.2", "1.0.0-beta.11", "1.0.0", "1.0.1+build"}
+	for i := 1; i < len(ordered); i++ {
+		if compareSemver(ordered[i-1], ordered[i]) >= 0 || compareSemver(ordered[i], ordered[i-1]) <= 0 {
+			t.Errorf("%s should sort before %s", ordered[i-1], ordered[i])
+		}
+	}
+	if compareSemver("1.0.0+a", "1.0.0+b") != 0 {
+		t.Error("build metadata must not affect precedence")
+	}
+}

internal/provider/yamlalias.go

@@ -0,0 +1,46 @@
+package provider
+
+import (
+	"errors"
+
+	"gopkg.in/yaml.v3"
+)
+
+const MaxAliasExpandedNodes = 100000
+
+// ExpandYAMLAliases inlines alias targets and drops anchors so a node map
+// stays valid when copied away from the document that held its anchors;
+// budget caps nodes reached through aliases against alias bombs.
+func ExpandYAMLAliases(m map[string]yaml.Node, budget *int) (map[string]yaml.Node, error) {
+	var expand func(n *yaml.Node, viaAlias bool) (*yaml.Node, error)
+	expand = func(n *yaml.Node, viaAlias bool) (*yaml.Node, error) {
+		if viaAlias {
+			*budget--
+			if *budget < 0 {
+				return nil, errors.New("yaml aliases expand to too many nodes")
+			}
+		}
+		if n.Kind == yaml.AliasNode {
+			return expand(n.Alias, true)
+		}
+		c := *n
+		c.Anchor = ""
+		c.Content = make([]*yaml.Node, len(n.Content))
+		for i, ch := range n.Content {
+			var err error
+			if c.Content[i], err = expand(ch, viaAlias); err != nil {
+				return nil, err
+			}
+		}
+		return &c, nil
+	}
+	out := make(map[string]yaml.Node, len(m))
+	for k, v := range m {
+		e, err := expand(&v, false)
+		if err != nil {
+			return nil, err
+		}
+		out[k] = *e
+	}
+	return out, nil
+}

internal/server/server.go

@@ -21,19 +21,10 @@ import (
 	"git.unkin.net/unkin/artifactapi/internal/database"
 	"git.unkin.net/unkin/artifactapi/internal/gc"
 	"git.unkin.net/unkin/artifactapi/internal/githubauth"
+	_ "git.unkin.net/unkin/artifactapi/internal/provider/all"
 	"git.unkin.net/unkin/artifactapi/internal/provider/alpine"
-	_ "git.unkin.net/unkin/artifactapi/internal/provider/cargo"
 	"git.unkin.net/unkin/artifactapi/internal/provider/deb"
-	_ "git.unkin.net/unkin/artifactapi/internal/provider/docker"
-	_ "git.unkin.net/unkin/artifactapi/internal/provider/generic"
-	_ "git.unkin.net/unkin/artifactapi/internal/provider/goproxy"
-	_ "git.unkin.net/unkin/artifactapi/internal/provider/helm"
-	_ "git.unkin.net/unkin/artifactapi/internal/provider/npm"
-	_ "git.unkin.net/unkin/artifactapi/internal/provider/nuget"
-	_ "git.unkin.net/unkin/artifactapi/internal/provider/puppet"
-	_ "git.unkin.net/unkin/artifactapi/internal/provider/pypi"
 	"git.unkin.net/unkin/artifactapi/internal/provider/rpm"
-	_ "git.unkin.net/unkin/artifactapi/internal/provider/terraform"
 	"git.unkin.net/unkin/artifactapi/internal/proxy"
 	"git.unkin.net/unkin/artifactapi/internal/storage"
 	"git.unkin.net/unkin/artifactapi/internal/tfsign"
@@ -175,6 +166,7 @@ func (s *Server) routes() chi.Router {
 	r.Mount(tfregistry.MountPath, s.tfRegistry.Routes())
 
 	proxyHandler := v1.NewProxyHandler(s.engine, s.virtEngine, s.db, s.store, s.localHandler)
+	s.virtEngine.NPMLocal = proxyHandler.LocalNPMPackument
 	r.Mount("/api/v1", proxyHandler.Routes())
 	r.Mount("/v2", proxyHandler.DockerV2Routes())
 

internal/virtual/deb_merger.go

@@ -1,245 +0,0 @@
-package virtual
-
-import (
-	"bytes"
-	"crypto/md5"
-	"encoding/hex"
-	"fmt"
-	"path"
-	"regexp"
-	"slices"
-	"strings"
-	"time"
-)
-
-// debIndexRe matches the binary Packages indexes a virtual merges: the flat
-// repo's root Packages and a suite's <component>/binary-<arch>/Packages.
-var debIndexRe = regexp.MustCompile(`^([^/]+/binary-[^/]+/)?Packages(\.[a-z0-9]+)?$`)
-
-// debByHashRe matches an index requested by its SHA256 (Acquire-By-Hash).
-var debByHashRe = regexp.MustCompile(`^([^/]+/binary-[^/]+/)?by-hash/SHA256/[0-9a-f]{64}$`)
-
-// debCompressions is the order a member's index variants are fetched in.
-var debCompressions = []string{".xz", ".gz", ".zst", ".bz2", ""}
-
-// DebMember is one member's Release plus its decompressed Packages indexes,
-// keyed by index directory relative to the Release ("" for a flat repo).
-type DebMember struct {
-	RemoteName string
-	Release    []byte
-	Packages   map[string][]byte
-}
-
-// DebRepo is a merged apt repo: Release plus the indexes it lists, keyed by
-// their path relative to the Release.
-type DebRepo struct {
-	Release []byte
-	Files   map[string][]byte
-}
-
-type debRelease struct {
-	fields map[string]string
-	files  []string
-}
-
-// parseDebRelease reads a Release file's single-line fields and the names
-// listed in its checksum sections.
-func parseDebRelease(body []byte) debRelease {
-	rel := debRelease{fields: map[string]string{}}
-	inSums := false
-	seen := map[string]bool{}
-	for line := range strings.SplitSeq(string(body), "\n") {
-		line = strings.TrimRight(line, "\r")
-		if line == "" {
-			continue
-		}
-		if line[0] == ' ' || line[0] == '\t' {
-			if f := strings.Fields(line); inSums && len(f) == 3 && !seen[f[2]] {
-				seen[f[2]] = true
-				rel.files = append(rel.files, f[2])
-			}
-			continue
-		}
-		k, v, _ := strings.Cut(line, ":")
-		v = strings.TrimSpace(v)
-		inSums = v == "" && (k == "MD5Sum" || strings.HasPrefix(k, "SHA"))
-		if _, ok := rel.fields[k]; !ok {
-			rel.fields[k] = v
-		}
-	}
-	return rel
-}
-
-// debIndexFiles returns, per index directory, the variant of its Packages file
-// to fetch from a member's Release listing.
-func debIndexFiles(rel debRelease) map[string]string {
-	listed := map[string]bool{}
-	for _, f := range rel.files {
-		listed[f] = true
-	}
-	out := map[string]string{}
-	for _, f := range rel.files {
-		m := debIndexRe.FindStringSubmatch(f)
-		if m == nil || out[m[1]] != "" {
-			continue
-		}
-		for _, c := range debCompressions {
-			if listed[m[1]+"Packages"+c] {
-				out[m[1]] = m[1] + "Packages" + c
-				break
-			}
-		}
-	}
-	return out
-}
-
-func splitStanzas(body []byte) []string {
-	var out []string
-	for s := range strings.SplitSeq(strings.ReplaceAll(string(body), "\r\n", "\n"), "\n\n") {
-		if s = strings.Trim(s, "\n"); s != "" {
-			out = append(out, s)
-		}
-	}
-	return out
-}
-
-func stanzaField(stanza, key string) string {
-	for line := range strings.SplitSeq(stanza, "\n") {
-		if k, v, ok := strings.Cut(line, ":"); ok && k == key {
-			return strings.TrimSpace(v)
-		}
-	}
-	return ""
-}
-
-func unionFields(dst []string, field string) []string {
-	for f := range strings.FieldsSeq(field) {
-		if !slices.Contains(dst, f) {
-			dst = append(dst, f)
-		}
-	}
-	return dst
-}
-
-func parseDebDate(s string) (time.Time, bool) {
-	for _, layout := range []string{time.RFC1123Z, time.RFC1123} {
-		if t, err := time.Parse(layout, s); err == nil {
-			return t, true
-		}
-	}
-	return time.Time{}, false
-}
-
-// MergeDeb merges members into one apt repo. Members are in priority order: the
-// first member to carry a (Package, Version, Architecture) in an index wins;
-// stanzas missing any of those are always kept. Filename is prefixed with the
-// owning member's name so the virtual can route downloads back to it.
-func MergeDeb(members []DebMember) *DebRepo {
-	var suite, codename string
-	var arches, comps, dirs []string
-	date := time.Unix(0, 0)
-	for _, m := range members {
-		rel := parseDebRelease(m.Release)
-		if suite == "" {
-			suite, codename = rel.fields["Suite"], rel.fields["Codename"]
-		}
-		arches = unionFields(arches, rel.fields["Architectures"])
-		comps = unionFields(comps, rel.fields["Components"])
-		if t, ok := parseDebDate(rel.fields["Date"]); ok && t.After(date) {
-			date = t
-		}
-		for d := range m.Packages {
-			if !slices.Contains(dirs, d) {
-				dirs = append(dirs, d)
-			}
-		}
-	}
-	slices.Sort(dirs)
-
-	repo := &DebRepo{Files: map[string][]byte{}}
-	for _, d := range dirs {
-		seen := map[string]bool{}
-		var b bytes.Buffer
-		for _, m := range members {
-			for _, s := range splitStanzas(m.Packages[d]) {
-				pkg, ver, arch := stanzaField(s, "Package"), stanzaField(s, "Version"), stanzaField(s, "Architecture")
-				if pkg != "" && ver != "" && arch != "" {
-					key := pkg + "\x00" + ver + "\x00" + arch
-					if seen[key] {
-						continue
-					}
-					seen[key] = true
-				}
-				if fn := stanzaField(s, "Filename"); fn != "" {
-					s = rewriteFilename(s, m.RemoteName+"/"+strings.TrimPrefix(path.Clean("/"+fn), "/"))
-				}
-				b.WriteString(s)
-				b.WriteString("\n\n")
-			}
-		}
-		gz := gzipDeterministic(b.Bytes())
-		repo.Files[d+"Packages"] = b.Bytes()
-		repo.Files[d+"Packages.gz"] = gz
-		repo.Files[d+"by-hash/SHA256/"+sha256Hex(b.Bytes())] = b.Bytes()
-		repo.Files[d+"by-hash/SHA256/"+sha256Hex(gz)] = gz
-	}
-
-	var r bytes.Buffer
-	if suite != "" {
-		fmt.Fprintf(&r, "Suite: %s\n", suite)
-	}
-	if codename != "" {
-		fmt.Fprintf(&r, "Codename: %s\n", codename)
-	}
-	fmt.Fprintf(&r, "Date: %s\n", date.UTC().Format(time.RFC1123Z))
-	fmt.Fprintf(&r, "Architectures: %s\n", strings.Join(arches, " "))
-	if len(comps) > 0 {
-		fmt.Fprintf(&r, "Components: %s\n", strings.Join(comps, " "))
-	}
-	r.WriteString("Acquire-By-Hash: yes\n")
-	for _, sec := range []struct {
-		name string
-		sum  func([]byte) string
-	}{{"MD5Sum", md5Hex}, {"SHA256", sha256Hex}} {
-		r.WriteString(sec.name + ":\n")
-		for _, d := range dirs {
-			for _, n := range []string{d + "Packages", d + "Packages.gz"} {
-				fmt.Fprintf(&r, " %s %d %s\n", sec.sum(repo.Files[n]), len(repo.Files[n]), n)
-			}
-		}
-	}
-	repo.Release = r.Bytes()
-	return repo
-}
-
-func rewriteFilename(stanza, fn string) string {
-	lines := strings.Split(stanza, "\n")
-	for i, l := range lines {
-		if strings.HasPrefix(l, "Filename:") {
-			lines[i] = "Filename: " + fn
-			break
-		}
-	}
-	return strings.Join(lines, "\n")
-}
-
-// debIndexPath splits an index request into its Release directory and the file
-// under it. ok is false for anything a deb virtual does not merge.
-func debIndexPath(p string) (base, name string, ok bool) {
-	if rest, found := strings.CutPrefix(p, "dists/"); found {
-		suite, n, found := strings.Cut(rest, "/")
-		if !found || suite == "" {
-			return "", "", false
-		}
-		base, p = "dists/"+suite+"/", n
-	}
-	if p != "Release" && !debIndexRe.MatchString(p) && !debByHashRe.MatchString(p) {
-		return "", "", false
-	}
-	return base, p, true
-}
-
-func md5Hex(data []byte) string {
-	h := md5.Sum(data)
-	return hex.EncodeToString(h[:])
-}

internal/virtual/deb_merger_test.go

@@ -1,179 +0,0 @@
-package virtual
-
-import (
-	"bytes"
-	"crypto/md5"
-	"encoding/hex"
-	"fmt"
-	"maps"
-	"path"
-	"slices"
-	"strings"
-	"testing"
-)
-
-func debStanza(pkg, ver, arch, filename string) string {
-	return fmt.Sprintf("Package: %s\nVersion: %s\nArchitecture: %s\nDescription: test\n multi-line body\nFilename: %s\nSize: 1\n", pkg, ver, arch, filename)
-}
-
-func flatDebMember(name, date string, stanzas ...string) DebMember {
-	rel := "Date: " + date + "\nArchitectures: amd64\nAcquire-By-Hash: no\nSHA256:\n x 1 Packages\n x 1 Packages.gz\n"
-	return DebMember{RemoteName: name, Release: []byte(rel), Packages: map[string][]byte{"": []byte(strings.Join(stanzas, "\n"))}}
-}
-
-func TestMergeDebDedupesByMemberOrder(t *testing.T) {
-	repo := MergeDeb([]DebMember{
-		flatDebMember("a", "Mon, 05 Oct 2026 10:00:00 +0000",
-			debStanza("foo", "1.0", "amd64", "pool/foo_1.0_amd64.deb"),
-			debStanza("bar", "2.0", "amd64", "/pool/bar.deb"),
-			debStanza("dot", "1.0", "amd64", "./dot.deb"),
-			"Package: noversion\nFilename: nv1.deb\n",
-			"Package: noversion\nFilename: nv2.deb\n"),
-		flatDebMember("b", "Tue, 06 Oct 2026 10:00:00 UTC",
-			debStanza("foo", "1.0", "amd64", "pool/foo-from-b.deb"),
-			debStanza("foo", "1.0", "arm64", "pool/foo_arm64.deb"),
-			debStanza("foo", "1.1", "amd64", "o/r/releases/download/v1/foo.deb")),
-	})
-	pk := string(repo.Files["Packages"])
-	stanzas := splitStanzas(repo.Files["Packages"])
-	if len(stanzas) != 7 {
-		t.Fatalf("want 7 stanzas (one duplicate dropped), got %d:\n%s", len(stanzas), pk)
-	}
-	for _, want := range []string{
-		"Filename: a/pool/foo_1.0_amd64.deb",
-		"Filename: a/pool/bar.deb",
-		"Filename: a/dot.deb",
-		"Filename: a/nv1.deb",
-		"Filename: a/nv2.deb",
-		"Filename: b/pool/foo_arm64.deb",
-		"Filename: b/o/r/releases/download/v1/foo.deb",
-		" multi-line body",
-	} {
-		if !strings.Contains(pk, want) {
-			t.Errorf("merged Packages missing %q:\n%s", want, pk)
-		}
-	}
-	if strings.Contains(pk, "foo-from-b") {
-		t.Fatalf("second member's duplicate must lose:\n%s", pk)
-	}
-	if !bytes.Equal(gunzip(t, repo.Files["Packages.gz"]), repo.Files["Packages"]) {
-		t.Fatal("Packages.gz does not match Packages")
-	}
-	if !strings.Contains(string(repo.Release), "Date: Tue, 06 Oct 2026 10:00:00 +0000\n") {
-		t.Fatalf("Date should be the newest member date:\n%s", repo.Release)
-	}
-}
-
-func TestMergeDebReleaseHashesFiles(t *testing.T) {
-	repo := MergeDeb([]DebMember{flatDebMember("a", "", debStanza("foo", "1", "amd64", "pool/foo.deb"))})
-	rel := parseDebRelease(repo.Release)
-	if got := slices.Sorted(slices.Values(rel.files)); !slices.Equal(got, []string{"Packages", "Packages.gz"}) {
-		t.Fatalf("Release lists %v", got)
-	}
-	inSHA := false
-	checked := 0
-	for line := range strings.SplitSeq(string(repo.Release), "\n") {
-		if !strings.HasPrefix(line, " ") {
-			inSHA = line == "SHA256:"
-			continue
-		}
-		var sum, name string
-		var size int
-		if _, err := fmt.Sscan(line, &sum, &size, &name); err != nil {
-			t.Fatal(err)
-		}
-		body := repo.Files[name]
-		want := sha256Hex(body)
-		if !inSHA {
-			h := md5.Sum(body)
-			want = hex.EncodeToString(h[:])
-		}
-		if sum != want || size != len(body) {
-			t.Errorf("%s: Release has %s %d, file is %s %d", name, sum, size, want, len(body))
-		}
-		checked++
-	}
-	if checked != 4 {
-		t.Fatalf("checked %d Release entries, want 4:\n%s", checked, repo.Release)
-	}
-	if !bytes.Equal(MergeDeb([]DebMember{flatDebMember("a", "", debStanza("foo", "1", "amd64", "pool/foo.deb"))}).Release, repo.Release) {
-		t.Fatal("merge must be deterministic")
-	}
-}
-
-func TestMergeDebSuiteLayout(t *testing.T) {
-	rel := func(comps string) []byte {
-		return []byte("Suite: stable\nCodename: trixie\nArchitectures: amd64 arm64\nComponents: " + comps + "\nSHA256:\n x 1 main/binary-amd64/Packages.xz\n")
-	}
-	repo := MergeDeb([]DebMember{
-		{RemoteName: "deb1", Release: rel("main"), Packages: map[string][]byte{"main/binary-amd64/": []byte(debStanza("foo", "1", "amd64", "pool/main/f/foo.deb"))}},
-		{RemoteName: "deb2", Release: rel("main contrib"), Packages: map[string][]byte{
-			"main/binary-amd64/":    []byte(debStanza("bar", "1", "amd64", "pool/main/b/bar.deb")),
-			"contrib/binary-amd64/": []byte(debStanza("baz", "1", "amd64", "pool/contrib/b/baz.deb")),
-		}},
-	})
-	for _, want := range []string{"Suite: stable\n", "Codename: trixie\n", "Components: main contrib\n", "Architectures: amd64 arm64\n"} {
-		if !strings.Contains(string(repo.Release), want) {
-			t.Errorf("Release missing %q:\n%s", want, repo.Release)
-		}
-	}
-	want := []string{"contrib/binary-amd64/Packages", "contrib/binary-amd64/Packages.gz", "main/binary-amd64/Packages", "main/binary-amd64/Packages.gz"}
-	if got := slices.Sorted(slices.Values(parseDebRelease(repo.Release).files)); !slices.Equal(got, want) {
-		t.Fatalf("Release lists %v, want %v", got, want)
-	}
-	if !strings.Contains(string(repo.Release), "Acquire-By-Hash: yes\n") {
-		t.Fatalf("Release must advertise by-hash:\n%s", repo.Release)
-	}
-	for _, n := range want {
-		byHash := path.Dir(n) + "/by-hash/SHA256/" + sha256Hex(repo.Files[n])
-		if !bytes.Equal(repo.Files[byHash], repo.Files[n]) {
-			t.Errorf("%s not served at %s", n, byHash)
-		}
-	}
-	if len(repo.Files) != 2*len(want) {
-		t.Fatalf("files %v, want each index plus its by-hash copy", slices.Sorted(maps.Keys(repo.Files)))
-	}
-	if n := len(splitStanzas(repo.Files["main/binary-amd64/Packages"])); n != 2 {
-		t.Fatalf("main/binary-amd64 should merge both members, got %d stanzas", n)
-	}
-}
-
-func TestDebIndexFiles(t *testing.T) {
-	rel := parseDebRelease([]byte("Origin: Debian\nMD5Sum:\n a 1 main/binary-amd64/Packages\n a 1 main/binary-amd64/Packages.gz\nSHA256:\n" +
-		" a 1 main/binary-amd64/Packages\n a 1 main/binary-amd64/Packages.xz\n a 1 main/binary-amd64/Packages.gz\n" +
-		" a 1 main/debian-installer/binary-amd64/Packages.xz\n a 1 main/i18n/Translation-en.xz\n a 1 contrib/binary-all/Packages\n"))
-	got := debIndexFiles(rel)
-	want := map[string]string{"main/binary-amd64/": "main/binary-amd64/Packages.xz", "contrib/binary-all/": "contrib/binary-all/Packages"}
-	if !maps.Equal(got, want) {
-		t.Fatalf("got %v, want %v", got, want)
-	}
-	if flat := debIndexFiles(parseDebRelease([]byte("SHA256:\n a 1 Packages\n a 1 Packages.gz\n"))); flat[""] != "Packages.gz" {
-		t.Fatalf("flat repo should fetch Packages.gz, got %v", flat)
-	}
-}
-
-func TestDebIndexPath(t *testing.T) {
-	for _, tc := range []struct {
-		in, base, name string
-		ok             bool
-	}{
-		{"Release", "", "Release", true},
-		{"Packages.gz", "", "Packages.gz", true},
-		{"dists/trixie/Release", "dists/trixie/", "Release", true},
-		{"dists/trixie/main/binary-amd64/Packages", "dists/trixie/", "main/binary-amd64/Packages", true},
-		{"by-hash/SHA256/abababababababababababababababababababababababababababababababab", "", "by-hash/SHA256/abababababababababababababababababababababababababababababababab", true},
-		{"dists/trixie/main/binary-amd64/by-hash/SHA256/abababababababababababababababababababababababababababababababab", "dists/trixie/", "main/binary-amd64/by-hash/SHA256/abababababababababababababababababababababababababababababababab", true},
-		{"dists/trixie/main/binary-amd64/by-hash/MD5Sum/abababababababababababababababab", "", "", false},
-		{"InRelease", "", "", false},
-		{"Release.gpg", "", "", false},
-		{"dists/trixie/InRelease", "", "", false},
-		{"dists/trixie/main/i18n/Translation-en", "", "", false},
-		{"dists/Release", "", "", false},
-		{"pool/foo.deb", "", "", false},
-	} {
-		base, name, ok := debIndexPath(tc.in)
-		if base != tc.base || name != tc.name || ok != tc.ok {
-			t.Errorf("%s: got (%q, %q, %v), want (%q, %q, %v)", tc.in, base, name, ok, tc.base, tc.name, tc.ok)
-		}
-	}
-}

internal/virtual/engine.go

@@ -9,7 +9,6 @@ import (
 	"net/http"
 	"net/http/httptest"
 	"net/url"
-	"path"
 	"slices"
 	"strings"
 	"sync"
@@ -27,7 +26,11 @@ type Engine struct {
 	proxyEngine *proxy.Engine
 	getRemote   func(context.Context, string) (*models.Remote, error)
 	rpmMember   func(context.Context, string) (*RPMMember, error)
-	debMember   func(ctx context.Context, name, base string) (*DebMember, error)
+	npmMember   func(ctx context.Context, name, pkg string) (*NPMMember, error)
+
+	// NPMLocal returns a local npm repo's packument with tarball paths relative
+	// to the repo, or ErrNotFound.
+	NPMLocal func(ctx context.Context, repo, pkg string) ([]byte, error)
 
 	mergeTTL time.Duration
 
@@ -44,34 +47,26 @@ type mergedRepo interface {
 
 func (r *RPMRepo) index() []byte            { return r.Repomd }
 func (r *RPMRepo) files() map[string][]byte { return r.Files }
-func (r *DebRepo) index() []byte            { return r.Release }
-func (r *DebRepo) files() map[string][]byte { return r.Files }
 
 // repoGen holds a virtual's current merge plus the previous one, so a client
 // holding the previous index can still fetch the files it references.
 type repoGen struct {
 	cur, prev mergedRepo
-	at, used  time.Time
+	at        time.Time
 }
 
 const rpmMergeTTL = 60 * time.Second
 
-// maxDebSuites bounds the client-chosen suites cached per deb virtual.
-const maxDebSuites = 32
-
 func NewEngine(db *database.DB, proxyEngine *proxy.Engine) *Engine {
 	e := &Engine{db: db, proxyEngine: proxyEngine, getRemote: db.GetRemote, mergeTTL: rpmMergeTTL}
 	e.rpmMember = e.fetchRPMMember
-	e.debMember = e.fetchDebMember
+	e.npmMember = e.fetchNPMMember
 	return e
 }
 
 func (e *Engine) Fetch(ctx context.Context, virt models.Virtual, path string, proxyBaseURL string) ([]byte, string, error) {
-	switch virt.PackageType {
-	case models.PackageRPM:
+	if virt.PackageType == models.PackageRPM {
 		return e.fetchRPM(ctx, virt, path)
-	case models.PackageDeb:
-		return e.fetchDeb(ctx, virt, path)
 	}
 
 	merger, err := GetMerger(virt.PackageType)
@@ -190,8 +185,8 @@ var (
 	ErrBadPath  = errors.New("invalid path")
 )
 
-// MemberRedirect maps an rpm or deb virtual package path (<member>/<href>, as
-// written by MergeRPM/MergeDeb) to the owning member's route. ok is false for
+// MemberRedirect maps an rpm or npm virtual package path (<member>/<href>, as
+// written by MergeRPM/MergeNPM) to the owning member's route. ok is false for
 // any other path; ErrBadPath means the path is absolute or escapes the member.
 func (e *Engine) MemberRedirect(ctx context.Context, virt models.Virtual, path, rawQuery, proxyBaseURL string) (string, bool, error) {
 	switch virt.PackageType {
@@ -199,12 +194,7 @@ func (e *Engine) MemberRedirect(ctx context.Context, virt models.Virtual, path,
 		if strings.HasPrefix(path, "repodata/") {
 			return "", false, nil
 		}
-	case models.PackageDeb:
-		// apt requests a flat repo's files under its "./" dist verbatim.
-		path = strings.TrimPrefix(path, "./")
-		if strings.HasPrefix(path, "dists/") {
-			return "", false, nil
-		}
+	case models.PackageNPM:
 	default:
 		return "", false, nil
 	}
@@ -279,7 +269,6 @@ func (e *Engine) merged(ctx context.Context, key string, merge func(context.Cont
 	e.mu.Lock()
 	g := e.gens[key]
 	if g != nil && time.Since(g.at) < e.mergeTTL {
-		g.used = time.Now()
 		e.mu.Unlock()
 		return g.cur, nil
 	}
@@ -298,12 +287,12 @@ func (e *Engine) merged(ctx context.Context, key string, merge func(context.Cont
 		g := e.gens[key]
 		switch {
 		case g == nil:
-			e.gens[key] = &repoGen{cur: repo, at: time.Now(), used: time.Now()}
+			e.gens[key] = &repoGen{cur: repo, at: time.Now()}
 		case string(g.cur.index()) == string(repo.index()):
-			g.at, g.used = time.Now(), time.Now()
+			g.at = time.Now()
 			repo = g.cur
 		default:
-			g.prev, g.cur, g.at, g.used = g.cur, repo, time.Now(), time.Now()
+			g.prev, g.cur, g.at = g.cur, repo, time.Now()
 		}
 		return repo, nil
 	})
@@ -350,85 +339,6 @@ func fetchMembers[T any](virt models.Virtual, fetch func(name string) (*T, error
 	return members, nil
 }
 
-func (e *Engine) fetchDeb(ctx context.Context, virt models.Virtual, reqPath string) ([]byte, string, error) {
-	base, name, ok := debIndexPath(strings.TrimPrefix(path.Clean("/"+reqPath), "/"))
-	if !ok {
-		return nil, "", ErrNotFound
-	}
-	key := "deb\x00" + virt.Name + "\x00" + base
-	if name != "Release" {
-		if body, ok := e.cachedFile(key, name); ok {
-			return body, debContentType(name), nil
-		}
-	}
-
-	repo, err := e.merged(ctx, key, func(ctx context.Context) (mergedRepo, error) {
-		members, err := fetchMembers(virt, func(name string) (*DebMember, error) { return e.debMember(ctx, name, base) })
-		if err != nil {
-			return nil, err
-		}
-		return MergeDeb(members), nil
-	})
-	if err != nil {
-		return nil, "", err
-	}
-	e.evictLRU("deb\x00"+virt.Name+"\x00", maxDebSuites)
-	if name == "Release" {
-		return repo.index(), "text/plain", nil
-	}
-	if body, ok := repo.files()[name]; ok {
-		return body, debContentType(name), nil
-	}
-	return nil, "", ErrNotFound
-}
-
-func debContentType(name string) string {
-	if strings.HasSuffix(name, ".gz") {
-		return "application/gzip"
-	}
-	return "text/plain"
-}
-
-// fetchDebMember reads a member's Release under base and each binary Packages
-// index it lists.
-func (e *Engine) fetchDebMember(ctx context.Context, name, base string) (*DebMember, error) {
-	remote, err := e.getRemote(ctx, name)
-	if err != nil {
-		return nil, fmt.Errorf("remote %q: %w", name, err)
-	}
-	rel, err := e.fetchMemberPath(ctx, *remote, base+"Release")
-	if err != nil {
-		return nil, err
-	}
-	m := &DebMember{RemoteName: name, Release: rel, Packages: map[string][]byte{}}
-	for dir, file := range debIndexFiles(parseDebRelease(rel)) {
-		raw, err := e.fetchMemberPath(ctx, *remote, base+file)
-		if err != nil {
-			return nil, err
-		}
-		if m.Packages[dir], err = decompress(file, raw); err != nil {
-			return nil, fmt.Errorf("decompress %s: %w", file, err)
-		}
-	}
-	return m, nil
-}
-
-// evictLRU drops the least recently used merges under prefix beyond keep.
-func (e *Engine) evictLRU(prefix string, keep int) {
-	e.mu.Lock()
-	defer e.mu.Unlock()
-	var keys []string
-	for k := range e.gens {
-		if strings.HasPrefix(k, prefix) {
-			keys = append(keys, k)
-		}
-	}
-	slices.SortFunc(keys, func(a, b string) int { return e.gens[b].used.Compare(e.gens[a].used) })
-	for _, k := range keys[min(len(keys), keep):] {
-		delete(e.gens, k)
-	}
-}
-
 func (e *Engine) cachedFile(key, path string) ([]byte, bool) {
 	e.mu.Lock()
 	defer e.mu.Unlock()
@@ -441,7 +351,6 @@ func (e *Engine) cachedFile(key, path string) ([]byte, bool) {
 			continue
 		}
 		if body, ok := r.files()[path]; ok {
-			g.used = time.Now()
 			return body, true
 		}
 	}

internal/virtual/engine_test.go

@@ -5,7 +5,6 @@ import (
 	"errors"
 	"fmt"
 	"regexp"
-	"strings"
 	"sync"
 	"sync/atomic"
 	"testing"
@@ -158,97 +157,6 @@ func TestMemberRedirect(t *testing.T) {
 	}
 }
 
-func debEngine(members map[string]*DebMember) *Engine {
-	e := fakeEngine(nil)
-	e.debMember = func(_ context.Context, name, base string) (*DebMember, error) {
-		if m := members[name]; m != nil && base == "" {
-			return m, nil
-		}
-		return nil, errors.New("upstream down")
-	}
-	return e
-}
-
-func debVirt(members ...string) models.Virtual {
-	return models.Virtual{Name: "v", PackageType: models.PackageDeb, Members: members}
-}
-
-func TestFetchDebFailsClosed(t *testing.T) {
-	a := flatDebMember("a", "", debStanza("foo", "1", "amd64", "pool/foo.deb"))
-	e := debEngine(map[string]*DebMember{"a": &a})
-	for _, p := range []string{"Release", "./Packages.gz", "dists/trixie/Release"} {
-		if _, _, err := e.Fetch(context.Background(), debVirt("a", "b"), p, ""); err == nil || errors.Is(err, ErrNotFound) {
-			t.Errorf("%s: want upstream error with a member down, got %v", p, err)
-		}
-	}
-	for _, p := range []string{"InRelease", "./Release.gpg", "Packages.xz"} {
-		if _, _, err := e.Fetch(context.Background(), debVirt("a"), p, ""); !errors.Is(err, ErrNotFound) {
-			t.Errorf("%s: want not found, got %v", p, err)
-		}
-	}
-}
-
-func TestFetchDebRemergesAfterTTL(t *testing.T) {
-	a := flatDebMember("a", "", debStanza("foo", "1", "amd64", "pool/foo_1.deb"))
-	e := debEngine(map[string]*DebMember{"a": &a})
-	virt := debVirt("a")
-
-	rel, _, err := e.Fetch(context.Background(), virt, "./Release", "")
-	if err != nil {
-		t.Fatal(err)
-	}
-	a.Packages[""] = []byte(debStanza("foo", "2", "amd64", "pool/foo_2.deb"))
-	e.mergeTTL = 0
-	newRel, _, err := e.Fetch(context.Background(), virt, "Release", "")
-	if err != nil || string(newRel) == string(rel) {
-		t.Fatalf("Release should reflect the member change (err %v)", err)
-	}
-	pk, ct, err := e.Fetch(context.Background(), virt, "./Packages", "")
-	if err != nil || ct != "text/plain" || !strings.Contains(string(pk), "Version: 2") {
-		t.Fatalf("Packages should be the current merge (ct %q, err %v):\n%s", ct, err, pk)
-	}
-}
-
-func TestFetchDebMergeIsSharedPerSuite(t *testing.T) {
-	var calls atomic.Int32
-	e := fakeEngine(nil)
-	e.mergeTTL = time.Minute
-	e.debMember = func(_ context.Context, name, base string) (*DebMember, error) {
-		calls.Add(1)
-		m := flatDebMember(name, "", debStanza("foo", "1", "amd64", "pool/foo.deb"))
-		return &m, nil
-	}
-	for _, p := range []string{"Release", "Packages", "Packages.gz", "./Release", "dists/a/Release", "dists/b/Release"} {
-		if _, _, err := e.Fetch(context.Background(), debVirt("a"), p, ""); err != nil && !errors.Is(err, ErrNotFound) {
-			t.Fatal(err)
-		}
-	}
-	if n := calls.Load(); n != 3 {
-		t.Fatalf("member fetched %d times, want once per Release dir (3)", n)
-	}
-}
-
-func TestMemberRedirectDeb(t *testing.T) {
-	e := fakeEngine(nil)
-	virt := debVirt("gh", "loc")
-	for _, tc := range []struct {
-		path, want string
-		ok         bool
-		err        error
-	}{
-		{path: "gh/o/r/releases/download/v1/foo_1.0_amd64.deb", ok: true, want: "http://h/api/v1/remote/gh/o/r/releases/download/v1/foo_1.0_amd64.deb"},
-		{path: "./gh/pool/a+b.deb", ok: true, want: "http://h/api/v1/remote/gh/pool/a+b.deb"},
-		{path: "gh/../loc/x.deb", err: ErrBadPath},
-		{path: "dists/trixie/Release"},
-		{path: "Packages"},
-	} {
-		got, ok, err := e.MemberRedirect(context.Background(), virt, tc.path, "", "http://h/")
-		if got != tc.want || ok != tc.ok || !errors.Is(err, tc.err) {
-			t.Errorf("%s: got (%q, %v, %v), want (%q, %v, %v)", tc.path, got, ok, err, tc.want, tc.ok, tc.err)
-		}
-	}
-}
-
 type fakeRepo struct {
 	idx string
 	fs  map[string][]byte
@@ -298,72 +206,3 @@ func TestMergedReusesWithinTTLAndIsolatesKeys(t *testing.T) {
 		t.Error("unknown key served a file")
 	}
 }
-
-func suiteDebMember(name, version string) *DebMember {
-	return &DebMember{RemoteName: name, Release: []byte("Suite: s\nSHA256:\n x 1 main/binary-amd64/Packages.gz\n"),
-		Packages: map[string][]byte{"main/binary-amd64/": []byte(debStanza("foo", version, "amd64", "pool/foo_"+version+".deb"))}}
-}
-
-func TestFetchDebByHashSurvivesRemerge(t *testing.T) {
-	version := "1"
-	e := fakeEngine(nil)
-	e.debMember = func(_ context.Context, name, _ string) (*DebMember, error) { return suiteDebMember(name, version), nil }
-	virt := debVirt("a")
-	fetch := func(p string) []byte {
-		body, _, err := e.Fetch(context.Background(), virt, p, "")
-		if err != nil {
-			t.Fatalf("%s: %v", p, err)
-		}
-		return body
-	}
-	byHash := func(rel []byte) string {
-		m := regexp.MustCompile(`(?m)^SHA256:\n(?: .*\n)*? ([0-9a-f]{64}) \d+ main/binary-amd64/Packages.gz$`).FindSubmatch(rel)
-		if m == nil {
-			t.Fatalf("no Packages.gz SHA256 in Release:\n%s", rel)
-		}
-		return "dists/trixie/main/binary-amd64/by-hash/SHA256/" + string(m[1])
-	}
-
-	oldRel := fetch("dists/trixie/Release")
-	version, e.mergeTTL = "2", 0
-	if newRel := fetch("dists/trixie/Release"); string(newRel) == string(oldRel) {
-		t.Fatal("Release should reflect the member change")
-	}
-	if got := string(gunzip(t, fetch(byHash(oldRel)))); !strings.Contains(got, "Version: 1\n") {
-		t.Fatalf("by-hash from the previous Release served the wrong index:\n%s", got)
-	}
-	if got := string(fetch("dists/trixie/main/binary-amd64/Packages")); !strings.Contains(got, "Version: 2\n") {
-		t.Fatalf("fixed-name Packages should be the current merge:\n%s", got)
-	}
-}
-
-func TestFetchDebBoundsSuitesPerVirtual(t *testing.T) {
-	e := fakeEngine(nil)
-	e.mergeTTL = time.Minute
-	e.debMember = func(_ context.Context, name, _ string) (*DebMember, error) { return suiteDebMember(name, "1"), nil }
-	other := models.Virtual{Name: "other", PackageType: models.PackageDeb, Members: []string{"a"}}
-	if _, _, err := e.Fetch(context.Background(), other, "dists/keep/Release", ""); err != nil {
-		t.Fatal(err)
-	}
-	for i := range maxDebSuites + 5 {
-		if _, _, err := e.Fetch(context.Background(), debVirt("a"), fmt.Sprintf("dists/s%d/Release", i), ""); err != nil {
-			t.Fatal(err)
-		}
-		time.Sleep(time.Microsecond)
-	}
-	n := 0
-	for k := range e.gens {
-		if strings.HasPrefix(k, "deb\x00v\x00") {
-			n++
-		}
-	}
-	if n != maxDebSuites {
-		t.Fatalf("virtual v caches %d suites, want %d", n, maxDebSuites)
-	}
-	if e.gens["deb\x00v\x00dists/s0/"] != nil || e.gens["deb\x00v\x00dists/s4/"] != nil {
-		t.Fatal("least recently used suites should be evicted first")
-	}
-	if e.gens["deb\x00other\x00dists/keep/"] == nil {
-		t.Fatal("another virtual's suites must not be evicted")
-	}
-}

internal/virtual/helm_merger.go

@@ -2,10 +2,14 @@ package virtual
 
 import (
 	"fmt"
+	"log/slog"
+	"maps"
+	"slices"
 	"strings"
 
 	"gopkg.in/yaml.v3"
 
+	"git.unkin.net/unkin/artifactapi/internal/provider"
 	"git.unkin.net/unkin/artifactapi/pkg/models"
 )
 
@@ -16,22 +20,17 @@ func init() {
 type HelmMerger struct{}
 
 type helmIndex struct {
-	APIVersion string                        `yaml:"apiVersion"`
-	Entries    map[string][]helmChartVersion `yaml:"entries"`
-	Generated  string                        `yaml:"generated,omitempty"`
-}
-
-type helmChartVersion struct {
-	Name    string   `yaml:"name"`
-	Version string   `yaml:"version"`
-	URLs    []string `yaml:"urls"`
-	rest    map[string]any
+	APIVersion string                            `yaml:"apiVersion"`
+	Entries    map[string][]map[string]yaml.Node `yaml:"entries"`
+	Generated  string                            `yaml:"generated,omitempty"`
 }
 
+// MergeIndexes keeps each chart version's fields as raw nodes so digest,
+// apiVersion and the rest survive the merge untouched; only urls are rewritten.
 func (m *HelmMerger) MergeIndexes(members []MemberIndex, proxyBaseURL string) ([]byte, error) {
 	merged := &helmIndex{
 		APIVersion: "v1",
-		Entries:    make(map[string][]helmChartVersion),
+		Entries:    make(map[string][]map[string]yaml.Node),
 	}
 
 	seen := map[string]map[string]bool{}
@@ -42,47 +41,38 @@ func (m *HelmMerger) MergeIndexes(members []MemberIndex, proxyBaseURL string) ([
 			continue
 		}
 
-		for chart, versions := range idx.Entries {
+		budget := provider.MaxAliasExpandedNodes
+		for _, chart := range slices.Sorted(maps.Keys(idx.Entries)) {
+			versions := idx.Entries[chart]
 			if seen[chart] == nil {
 				seen[chart] = map[string]bool{}
 			}
-			for _, ver := range versions {
-				key := chart + ":" + ver.Version
-				if seen[chart][ver.Version] {
+			for _, raw := range versions {
+				ver, err := provider.ExpandYAMLAliases(raw, &budget)
+				if err != nil {
+					slog.Warn("helm merge: dropping chart entry", "member", member.RemoteName, "chart", chart, "error", err)
 					continue
 				}
-				seen[chart][ver.Version] = true
+				version := ver["version"].Value
+				if seen[chart][version] {
+					continue
+				}
+				seen[chart][version] = true
 
-				if proxyBaseURL != "" {
-					routePrefix := "remote"
-					if member.RepoType == "local" {
-						routePrefix = "local"
+				if urlsNode, ok := ver["urls"]; ok && proxyBaseURL != "" {
+					var urls []string
+					if err := urlsNode.Decode(&urls); err != nil {
+						continue
 					}
-					baseHost := extractHost(member.BaseURL)
-
-					for i, u := range ver.URLs {
-						if strings.HasPrefix(u, "http://") || strings.HasPrefix(u, "https://") {
-							if baseHost != "" && extractHost(u) != baseHost {
-								continue
-							}
-							relPath := extractPathRelativeToBase(u, member.BaseURL)
-							ver.URLs[i] = fmt.Sprintf("%s/api/v1/%s/%s/%s",
-								strings.TrimRight(proxyBaseURL, "/"),
-								routePrefix,
-								member.RemoteName,
-								relPath)
-						} else {
-							ver.URLs[i] = fmt.Sprintf("%s/api/v1/%s/%s/%s",
-								strings.TrimRight(proxyBaseURL, "/"),
-								routePrefix,
-								member.RemoteName,
-								u)
-						}
+					rewriteHelmURLs(urls, member, proxyBaseURL)
+					var n yaml.Node
+					if err := n.Encode(urls); err != nil {
+						return nil, err
 					}
+					ver["urls"] = n
 				}
 
 				merged.Entries[chart] = append(merged.Entries[chart], ver)
-				_ = key
 			}
 		}
 	}
@@ -90,6 +80,34 @@ func (m *HelmMerger) MergeIndexes(members []MemberIndex, proxyBaseURL string) ([
 	return yaml.Marshal(merged)
 }
 
+func rewriteHelmURLs(urls []string, member MemberIndex, proxyBaseURL string) {
+	routePrefix := "remote"
+	if member.RepoType == "local" {
+		routePrefix = "local"
+	}
+	baseHost := extractHost(member.BaseURL)
+
+	for i, u := range urls {
+		if strings.HasPrefix(u, "http://") || strings.HasPrefix(u, "https://") {
+			if baseHost != "" && extractHost(u) != baseHost {
+				continue
+			}
+			relPath := extractPathRelativeToBase(u, member.BaseURL)
+			urls[i] = fmt.Sprintf("%s/api/v1/%s/%s/%s",
+				strings.TrimRight(proxyBaseURL, "/"),
+				routePrefix,
+				member.RemoteName,
+				relPath)
+		} else {
+			urls[i] = fmt.Sprintf("%s/api/v1/%s/%s/%s",
+				strings.TrimRight(proxyBaseURL, "/"),
+				routePrefix,
+				member.RemoteName,
+				u)
+		}
+	}
+}
+
 func extractHost(rawURL string) string {
 	idx := strings.Index(rawURL, "://")
 	if idx == -1 {

internal/virtual/helm_merger_test.go

@@ -1,9 +1,12 @@
 package virtual_test
 
 import (
+	"fmt"
 	"strings"
 	"testing"
 
+	"gopkg.in/yaml.v3"
+
 	"git.unkin.net/unkin/artifactapi/internal/virtual"
 )
 
@@ -122,3 +125,129 @@ entries:
 		t.Error("expected fallback repo to be excluded for duplicate")
 	}
 }
+
+func TestHelmMerger_PreservesChartFields(t *testing.T) {
+	m := &virtual.HelmMerger{}
+	body := []byte(`apiVersion: v1
+entries:
+  app:
+    - apiVersion: v2
+      name: app
+      version: "1.0"
+      appVersion: "3.1"
+      description: in-house
+      digest: deadbeef
+      urls:
+        - app-1.0.tgz
+`)
+	result, err := m.MergeIndexes([]virtual.MemberIndex{{RemoteName: "charts", RepoType: "local", Body: body}}, "https://proxy.example.com")
+	if err != nil {
+		t.Fatal(err)
+	}
+	out := string(result)
+	for _, want := range []string{
+		"digest: deadbeef",
+		"apiVersion: v2",
+		`appVersion: "3.1"`,
+		"description: in-house",
+		`version: "1.0"`,
+		"https://proxy.example.com/api/v1/local/charts/app-1.0.tgz",
+	} {
+		if !strings.Contains(out, want) {
+			t.Errorf("merged index missing %q:\n%s", want, out)
+		}
+	}
+}
+
+func TestHelmMerger_ExpandsAliasesAcrossDedupe(t *testing.T) {
+	m := &virtual.HelmMerger{}
+	first := []byte(`apiVersion: v1
+entries:
+  app:
+    - version: "1.0"
+      urls: [app-1.0.tgz]
+`)
+	second := []byte(`apiVersion: v1
+entries:
+  app:
+    - version: "1.0"
+      maintainers: &team
+        - name: ops
+      urls: [app-1.0.tgz]
+    - version: "2.0"
+      maintainers: *team
+      urls: [app-2.0.tgz]
+`)
+	result, err := m.MergeIndexes([]virtual.MemberIndex{
+		{RemoteName: "a", RepoType: "local", Body: first},
+		{RemoteName: "b", RepoType: "local", Body: second},
+	}, "https://proxy.example.com")
+	if err != nil {
+		t.Fatal(err)
+	}
+	var idx struct {
+		Entries map[string][]struct {
+			Version     string `yaml:"version"`
+			Maintainers []struct {
+				Name string `yaml:"name"`
+			} `yaml:"maintainers"`
+		} `yaml:"entries"`
+	}
+	if err := yaml.Unmarshal(result, &idx); err != nil {
+		t.Fatalf("merged index does not parse: %v\n%s", err, result)
+	}
+	app := idx.Entries["app"]
+	if len(app) != 2 || app[1].Version != "2.0" || len(app[1].Maintainers) != 1 || app[1].Maintainers[0].Name != "ops" {
+		t.Errorf("alias not expanded: %+v\n%s", app, result)
+	}
+}
+
+func TestHelmMerger_DropsAliasBomb(t *testing.T) {
+	m := &virtual.HelmMerger{}
+	body := []byte(`apiVersion: v1
+entries:
+  app:
+    - version: "1.0"
+      a: &a [x, x, x, x, x, x, x, x, x, x]
+      b: &b [*a, *a, *a, *a, *a, *a, *a, *a, *a, *a]
+      c: &c [*b, *b, *b, *b, *b, *b, *b, *b, *b, *b]
+      d: &d [*c, *c, *c, *c, *c, *c, *c, *c, *c, *c]
+      e: &e [*d, *d, *d, *d, *d, *d, *d, *d, *d, *d]
+      urls: [app-1.0.tgz]
+`)
+	result, err := m.MergeIndexes([]virtual.MemberIndex{{RemoteName: "a", RepoType: "local", Body: body}}, "https://proxy.example.com")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if strings.Contains(string(result), "app-1.0.tgz") {
+		t.Errorf("alias bomb entry was kept")
+	}
+}
+
+func TestHelmMerger_LargeIndexWithoutAliasesIsComplete(t *testing.T) {
+	var b strings.Builder
+	b.WriteString("apiVersion: v1\nentries:\n")
+	for c := 0; c < 100; c++ {
+		fmt.Fprintf(&b, "  chart%d:\n", c)
+		for v := 0; v < 100; v++ {
+			fmt.Fprintf(&b, "    - name: chart%d\n      version: \"1.0.%d\"\n      description: d\n      maintainers: [{name: ops, email: ops@example.com}]\n      urls: [chart%d-1.0.%d.tgz]\n", c, v, c, v)
+		}
+	}
+	result, err := (&virtual.HelmMerger{}).MergeIndexes([]virtual.MemberIndex{{RemoteName: "a", RepoType: "local", Body: []byte(b.String())}}, "https://proxy.example.com")
+	if err != nil {
+		t.Fatal(err)
+	}
+	var idx struct {
+		Entries map[string][]map[string]any `yaml:"entries"`
+	}
+	if err := yaml.Unmarshal(result, &idx); err != nil {
+		t.Fatal(err)
+	}
+	total := 0
+	for _, vs := range idx.Entries {
+		total += len(vs)
+	}
+	if len(idx.Entries) != 100 || total != 10000 {
+		t.Errorf("got %d charts, %d versions; want 100, 10000", len(idx.Entries), total)
+	}
+}

internal/virtual/npm_merger.go

@@ -0,0 +1,267 @@
+package virtual
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/http"
+	"net/url"
+	"regexp"
+	"slices"
+	"strings"
+
+	"git.unkin.net/unkin/artifactapi/internal/proxy"
+	"git.unkin.net/unkin/artifactapi/pkg/models"
+)
+
+const (
+	NPMAbbreviatedType = "application/vnd.npm.install-v1+json"
+	npmAbbreviatedFile = "install-v1"
+	maxNPMPackuments   = 1024
+)
+
+var npmVirtualNameRe = regexp.MustCompile(`^(@[A-Za-z0-9][A-Za-z0-9._~-]*/)?[A-Za-z0-9][A-Za-z0-9._~-]*$`)
+
+// npmAbbreviatedFields are the version fields kept in an install-v1 packument.
+var npmAbbreviatedFields = []string{
+	"name", "version", "deprecated", "dependencies", "optionalDependencies",
+	"devDependencies", "bundleDependencies", "peerDependencies", "peerDependenciesMeta",
+	"bin", "directories", "dist", "engines", "_hasShrinkwrap", "hasInstallScript",
+	"cpu", "os", "libc",
+}
+
+// NPMMember is one member's full packument for a package; Doc is nil when the
+// member does not have the package. Tarball URLs under one of Bases are
+// rewritten to go via the virtual; with no Bases (a local) they are relative.
+type NPMMember struct {
+	RemoteName string
+	Bases      []string
+	Doc        []byte
+}
+
+// NPMPackument is a merged packument in full and install-v1 form.
+type NPMPackument struct {
+	Full, Abbreviated []byte
+}
+
+func (p *NPMPackument) index() []byte { return p.Full }
+func (p *NPMPackument) files() map[string][]byte {
+	return map[string][]byte{npmAbbreviatedFile: p.Abbreviated}
+}
+
+// MergeNPM unions versions across members (first member wins a duplicate),
+// keeps the first member's value for each dist-tag, drops tags naming versions
+// outside the merged set and points every owned tarball at
+// tarballBase + <member>/<path>. ErrNotFound means no member has the package.
+func MergeNPM(members []NPMMember, tarballBase string) (*NPMPackument, error) {
+	var base map[string]json.RawMessage
+	versions := map[string]map[string]json.RawMessage{}
+	tags := map[string]string{}
+	times := map[string]json.RawMessage{}
+	var modified string
+	for _, m := range members {
+		if m.Doc == nil {
+			continue
+		}
+		var doc map[string]json.RawMessage
+		var vs map[string]map[string]json.RawMessage
+		var dt map[string]string
+		var tm map[string]json.RawMessage
+		if err := json.Unmarshal(m.Doc, &doc); err != nil {
+			return nil, fmt.Errorf("member %q packument: %w", m.RemoteName, err)
+		}
+		for field, dst := range map[string]any{"versions": &vs, "dist-tags": &dt, "time": &tm} {
+			if raw, ok := doc[field]; ok {
+				if err := json.Unmarshal(raw, dst); err != nil {
+					return nil, fmt.Errorf("member %q %s: %w", m.RemoteName, field, err)
+				}
+			}
+		}
+		if base == nil {
+			base = doc
+		}
+		for v, man := range vs {
+			if _, dup := versions[v]; dup || man == nil {
+				continue
+			}
+			if err := rewriteNPMTarball(man, m, tarballBase); err != nil {
+				return nil, fmt.Errorf("member %q %s: %w", m.RemoteName, v, err)
+			}
+			versions[v] = man
+		}
+		for tag, v := range dt {
+			if _, ok := tags[tag]; !ok {
+				tags[tag] = v
+			}
+		}
+		for k, v := range tm {
+			if k == "modified" {
+				var s string
+				if json.Unmarshal(v, &s) == nil && s > modified {
+					modified = s
+				}
+				continue
+			}
+			if _, ok := times[k]; !ok {
+				times[k] = v
+			}
+		}
+	}
+	if base == nil {
+		return nil, ErrNotFound
+	}
+	for tag, v := range tags {
+		if _, ok := versions[v]; !ok {
+			delete(tags, tag)
+		}
+	}
+	if modified != "" {
+		times["modified"], _ = json.Marshal(modified)
+	}
+
+	full := map[string]any{}
+	for k, v := range base {
+		full[k] = v
+	}
+	full["versions"], full["dist-tags"] = versions, tags
+	delete(full, "time")
+	if len(times) > 0 {
+		full["time"] = times
+	}
+
+	abbrevVersions := make(map[string]map[string]json.RawMessage, len(versions))
+	for v, man := range versions {
+		a := map[string]json.RawMessage{}
+		for _, f := range npmAbbreviatedFields {
+			if raw, ok := man[f]; ok {
+				a[f] = raw
+			}
+		}
+		abbrevVersions[v] = a
+	}
+	abbrev := map[string]any{"name": base["name"], "dist-tags": tags, "versions": abbrevVersions}
+	if modified != "" {
+		abbrev["modified"] = modified
+	}
+
+	fullJSON, err := json.Marshal(full)
+	if err != nil {
+		return nil, err
+	}
+	abbrevJSON, err := json.Marshal(abbrev)
+	if err != nil {
+		return nil, err
+	}
+	return &NPMPackument{Full: fullJSON, Abbreviated: abbrevJSON}, nil
+}
+
+// rewriteNPMTarball leaves a tarball outside the member's bases untouched.
+func rewriteNPMTarball(man map[string]json.RawMessage, m NPMMember, tarballBase string) error {
+	raw, ok := man["dist"]
+	if !ok {
+		return nil
+	}
+	var dist map[string]json.RawMessage
+	if err := json.Unmarshal(raw, &dist); err != nil {
+		return fmt.Errorf("dist: %w", err)
+	}
+	var tarball string
+	if err := json.Unmarshal(dist["tarball"], &tarball); err != nil {
+		return nil
+	}
+	rel, ok := npmMemberPath(tarball, m.Bases)
+	if !ok {
+		return nil
+	}
+	dist["tarball"], _ = json.Marshal(tarballBase + url.PathEscape(m.RemoteName) + "/" + rel)
+	man["dist"], _ = json.Marshal(dist)
+	return nil
+}
+
+func npmMemberPath(tarball string, bases []string) (string, bool) {
+	if len(bases) == 0 {
+		return tarball, tarball != "" && !strings.Contains(tarball, "://") && !strings.HasPrefix(tarball, "/")
+	}
+	for _, b := range bases {
+		if rel, ok := strings.CutPrefix(tarball, strings.TrimRight(b, "/")+"/"); ok && rel != "" {
+			return rel, true
+		}
+	}
+	return "", false
+}
+
+// FetchNPM serves the merged packument for the package named by path, full or
+// abbreviated (install-v1).
+func (e *Engine) FetchNPM(ctx context.Context, virt models.Virtual, path, proxyBaseURL string, abbreviated bool) ([]byte, string, error) {
+	pkg, err := url.PathUnescape(strings.TrimSuffix(path, "/"))
+	if err != nil || !npmVirtualNameRe.MatchString(pkg) {
+		return nil, "", ErrNotFound
+	}
+	prefix := "npm\x00" + virt.Name + "\x00"
+	tarballBase := strings.TrimRight(proxyBaseURL, "/") + "/api/v1/virtual/" + url.PathEscape(virt.Name) + "/"
+	repo, err := e.merged(ctx, prefix+pkg+"\x00"+proxyBaseURL, func(ctx context.Context) (mergedRepo, error) {
+		members, err := fetchMembers(virt, func(name string) (*NPMMember, error) { return e.npmMember(ctx, name, pkg) })
+		if err != nil {
+			return nil, err
+		}
+		p, err := MergeNPM(members, tarballBase)
+		if err != nil {
+			return nil, err
+		}
+		return p, nil
+	})
+	if err != nil {
+		return nil, "", err
+	}
+	e.evictOldest(prefix, maxNPMPackuments)
+	if abbreviated {
+		return repo.files()[npmAbbreviatedFile], NPMAbbreviatedType, nil
+	}
+	return repo.index(), "application/json", nil
+}
+
+// fetchNPMMember returns a member with a nil Doc when it lacks the package.
+func (e *Engine) fetchNPMMember(ctx context.Context, name, pkg string) (*NPMMember, error) {
+	remote, err := e.getRemote(ctx, name)
+	if err != nil {
+		return nil, fmt.Errorf("remote %q: %w", name, err)
+	}
+	m := &NPMMember{RemoteName: name}
+	if remote.RepoType == models.RepoTypeLocal {
+		if e.NPMLocal == nil {
+			return nil, errors.New("local npm packuments are not wired")
+		}
+		m.Doc, err = e.NPMLocal(ctx, name, pkg)
+	} else {
+		m.Bases = remote.UpstreamPool()
+		m.Doc, err = e.fetchMemberPath(ctx, *remote, strings.Replace(pkg, "/", "%2f", 1))
+	}
+	var pe *proxy.ProxyError
+	if errors.Is(err, ErrNotFound) || errors.As(err, &pe) && pe.Status == http.StatusNotFound {
+		return &NPMMember{RemoteName: name}, nil
+	}
+	if err != nil {
+		return nil, err
+	}
+	return m, nil
+}
+
+// evictOldest drops the oldest merges under prefix beyond keep.
+func (e *Engine) evictOldest(prefix string, keep int) {
+	e.mu.Lock()
+	defer e.mu.Unlock()
+	var keys []string
+	for k := range e.gens {
+		if strings.HasPrefix(k, prefix) {
+			keys = append(keys, k)
+		}
+	}
+	if len(keys) <= keep {
+		return
+	}
+	slices.SortFunc(keys, func(a, b string) int { return e.gens[b].at.Compare(e.gens[a].at) })
+	for _, k := range keys[keep:] {
+		delete(e.gens, k)
+	}
+}

internal/virtual/npm_merger_test.go

@@ -0,0 +1,289 @@
+package virtual
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"strings"
+	"sync"
+	"testing"
+	"time"
+
+	"git.unkin.net/unkin/artifactapi/pkg/models"
+)
+
+type npmDoc struct {
+	Name     string                    `json:"name"`
+	Readme   string                    `json:"readme,omitempty"`
+	Modified string                    `json:"modified,omitempty"`
+	DistTags map[string]string         `json:"dist-tags"`
+	Versions map[string]map[string]any `json:"versions"`
+	Time     map[string]string         `json:"time,omitempty"`
+}
+
+func npmVersion(name, v, tarball string) map[string]any {
+	return map[string]any{"name": name, "version": v, "readme": "long", "scripts": map[string]string{"test": "x"},
+		"dependencies": map[string]string{"dep": "^1"}, "dist": map[string]any{"tarball": tarball, "shasum": "abc"}}
+}
+
+func mustJSON(t *testing.T, v any) []byte {
+	t.Helper()
+	b, err := json.Marshal(v)
+	if err != nil {
+		t.Fatal(err)
+	}
+	return b
+}
+
+func decodeNPM(t *testing.T, b []byte) npmDoc {
+	t.Helper()
+	var d npmDoc
+	if err := json.Unmarshal(b, &d); err != nil {
+		t.Fatalf("decode %s: %v", b, err)
+	}
+	return d
+}
+
+func tarballOf(d npmDoc, v string) string {
+	dist, _ := d.Versions[v]["dist"].(map[string]any)
+	s, _ := dist["tarball"].(string)
+	return s
+}
+
+func npmMembersFixture(t *testing.T) []NPMMember {
+	local := npmDoc{Name: "pkg", DistTags: map[string]string{"latest": "1.0.0", "beta": "9.9.9"},
+		Versions: map[string]map[string]any{"1.0.0": npmVersion("pkg", "1.0.0", "pkg/-/pkg-1.0.0.tgz")}}
+	remote := npmDoc{Name: "pkg", Readme: "remote readme",
+		DistTags: map[string]string{"latest": "2.0.0", "next": "2.0.0", "beta": "1.0.0"},
+		Versions: map[string]map[string]any{
+			"1.0.0": npmVersion("pkg", "1.0.0", "https://registry.npmjs.org/pkg/-/pkg-1.0.0.tgz"),
+			"2.0.0": npmVersion("pkg", "2.0.0", "https://registry.npmjs.org/pkg/-/pkg-2.0.0.tgz"),
+			"3.0.0": npmVersion("pkg", "3.0.0", "https://cdn.example/pkg-3.0.0.tgz"),
+		},
+		Time: map[string]string{"modified": "2024-01-01T00:00:00.000Z", "2.0.0": "2023-01-01T00:00:00.000Z"}}
+	return []NPMMember{
+		{RemoteName: "internal", Doc: mustJSON(t, local)},
+		{RemoteName: "absent"},
+		{RemoteName: "npmjs", Bases: []string{"https://registry.npmjs.org/"}, Doc: mustJSON(t, remote)},
+	}
+}
+
+func TestMergeNPMUnionsVersionsMemberOrderWins(t *testing.T) {
+	p, err := MergeNPM(npmMembersFixture(t), "http://aa/api/v1/virtual/npm/")
+	if err != nil {
+		t.Fatal(err)
+	}
+	d := decodeNPM(t, p.Full)
+	if len(d.Versions) != 3 {
+		t.Fatalf("want 3 merged versions, got %v", d.Versions)
+	}
+	for v, want := range map[string]string{
+		"1.0.0": "http://aa/api/v1/virtual/npm/internal/pkg/-/pkg-1.0.0.tgz",
+		"2.0.0": "http://aa/api/v1/virtual/npm/npmjs/pkg/-/pkg-2.0.0.tgz",
+		"3.0.0": "https://cdn.example/pkg-3.0.0.tgz",
+	} {
+		if got := tarballOf(d, v); got != want {
+			t.Errorf("%s tarball = %q, want %q", v, got, want)
+		}
+	}
+	if d.Readme != "" {
+		t.Errorf("top-level fields come from the first member with the package, got readme %q", d.Readme)
+	}
+	if d.Time["modified"] != "2024-01-01T00:00:00.000Z" || d.Time["2.0.0"] == "" {
+		t.Errorf("time not merged: %v", d.Time)
+	}
+}
+
+func TestMergeNPMDistTags(t *testing.T) {
+	members := npmMembersFixture(t)
+	members[0].Doc = mustJSON(t, npmDoc{Name: "pkg", DistTags: map[string]string{"latest": "1.0.0", "gone": "0.0.1"},
+		Versions: map[string]map[string]any{"1.0.0": npmVersion("pkg", "1.0.0", "pkg/-/pkg-1.0.0.tgz")}})
+	p, err := MergeNPM(members, "http://aa/v/")
+	if err != nil {
+		t.Fatal(err)
+	}
+	got := decodeNPM(t, p.Full).DistTags
+	want := map[string]string{"latest": "1.0.0", "next": "2.0.0", "beta": "1.0.0"}
+	if fmt.Sprint(got) != fmt.Sprint(want) {
+		t.Fatalf("dist-tags = %v, want %v", got, want)
+	}
+}
+
+func TestMergeNPMDropsFirstTagNamingMissingVersion(t *testing.T) {
+	// internal claims beta=9.9.9 first; it wins over npmjs's beta, and is then
+	// dropped because no member has 9.9.9.
+	p, err := MergeNPM(npmMembersFixture(t), "http://aa/v/")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if tag, ok := decodeNPM(t, p.Full).DistTags["beta"]; ok {
+		t.Fatalf("beta should be dropped, got %q", tag)
+	}
+}
+
+func TestMergeNPMAbbreviated(t *testing.T) {
+	p, err := MergeNPM(npmMembersFixture(t), "http://aa/v/")
+	if err != nil {
+		t.Fatal(err)
+	}
+	var a map[string]any
+	if err := json.Unmarshal(p.Abbreviated, &a); err != nil {
+		t.Fatal(err)
+	}
+	if a["modified"] != "2024-01-01T00:00:00.000Z" || a["name"] != "pkg" || a["readme"] != nil || a["time"] != nil {
+		t.Fatalf("bad abbreviated top level: %v", a)
+	}
+	v := a["versions"].(map[string]any)["2.0.0"].(map[string]any)
+	if v["readme"] != nil || v["scripts"] != nil {
+		t.Errorf("abbreviated version keeps non-install fields: %v", v)
+	}
+	if v["dependencies"] == nil || v["dist"].(map[string]any)["tarball"] != "http://aa/v/npmjs/pkg/-/pkg-2.0.0.tgz" {
+		t.Errorf("abbreviated version lost install fields: %v", v)
+	}
+}
+
+func TestMergeNPMNoMemberHasPackage(t *testing.T) {
+	if _, err := MergeNPM([]NPMMember{{RemoteName: "a"}, {RemoteName: "b"}}, "http://aa/v/"); !errors.Is(err, ErrNotFound) {
+		t.Fatalf("want ErrNotFound, got %v", err)
+	}
+}
+
+func TestNPMMemberPath(t *testing.T) {
+	for _, c := range []struct {
+		tarball string
+		bases   []string
+		want    string
+		ok      bool
+	}{
+		{"@s/n/-/n-1.0.0.tgz", nil, "@s/n/-/n-1.0.0.tgz", true},
+		{"https://evil.example/x.tgz", nil, "", false},
+		{"/abs/x.tgz", nil, "", false},
+		{"https://r.example/@s/n/-/n-1.0.0.tgz", []string{"https://m.example", "https://r.example"}, "@s/n/-/n-1.0.0.tgz", true},
+		{"https://r.example.evil/x.tgz", []string{"https://r.example"}, "", false},
+	} {
+		got, ok := npmMemberPath(c.tarball, c.bases)
+		if ok != c.ok || ok && got != c.want {
+			t.Errorf("npmMemberPath(%q, %v) = %q,%v want %q,%v", c.tarball, c.bases, got, ok, c.want, c.ok)
+		}
+	}
+}
+
+func npmEngine(fetch func(name, pkg string) (*NPMMember, error)) *Engine {
+	return &Engine{
+		mergeTTL: time.Minute,
+		getRemote: func(_ context.Context, name string) (*models.Remote, error) {
+			return &models.Remote{Name: name, RepoType: models.RepoTypeRemote}, nil
+		},
+		npmMember: func(_ context.Context, name, pkg string) (*NPMMember, error) { return fetch(name, pkg) },
+	}
+}
+
+func npmVirt(members ...string) models.Virtual {
+	return models.Virtual{Name: "npm", PackageType: models.PackageNPM, Members: members}
+}
+
+func TestFetchNPMScopedAndAbbreviated(t *testing.T) {
+	var mu sync.Mutex
+	var asked []string
+	e := npmEngine(func(name, pkg string) (*NPMMember, error) {
+		mu.Lock()
+		asked = append(asked, pkg)
+		mu.Unlock()
+		if name == "b" {
+			return &NPMMember{RemoteName: name}, nil
+		}
+		return &NPMMember{RemoteName: name, Doc: mustJSON(t, npmDoc{Name: pkg, DistTags: map[string]string{"latest": "1.0.0"},
+			Versions: map[string]map[string]any{"1.0.0": npmVersion(pkg, "1.0.0", pkg+"/-/n-1.0.0.tgz")}})}, nil
+	})
+	body, ct, err := e.FetchNPM(context.Background(), npmVirt("a", "b"), "@s%2fn", "http://host", true)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if ct != NPMAbbreviatedType || !strings.Contains(string(body), `"tarball":"http://host/api/v1/virtual/npm/a/@s/n/-/n-1.0.0.tgz"`) {
+		t.Fatalf("ct %q body %s", ct, body)
+	}
+	if asked[0] != "@s/n" {
+		t.Fatalf("member asked for %q, want decoded scoped name", asked[0])
+	}
+	full, ct, err := e.FetchNPM(context.Background(), npmVirt("a", "b"), "@s%2fn", "http://host", false)
+	if err != nil || ct != "application/json" || string(full) == string(body) {
+		t.Fatalf("full packument: ct %q err %v", ct, err)
+	}
+	if len(asked) != 2 {
+		t.Fatalf("second fetch should be served from the merge cache, members asked %d times", len(asked))
+	}
+}
+
+func TestFetchNPMFailsClosed(t *testing.T) {
+	e := npmEngine(func(name, pkg string) (*NPMMember, error) {
+		if name == "b" {
+			return nil, errors.New("upstream down")
+		}
+		return &NPMMember{RemoteName: name, Doc: []byte(`{"name":"x","versions":{}}`)}, nil
+	})
+	_, _, err := e.FetchNPM(context.Background(), npmVirt("a", "b"), "x", "http://host", false)
+	if err == nil || errors.Is(err, ErrNotFound) {
+		t.Fatalf("want upstream error with a member down, got %v", err)
+	}
+}
+
+func TestFetchNPMNotFound(t *testing.T) {
+	e := npmEngine(func(name, _ string) (*NPMMember, error) { return &NPMMember{RemoteName: name}, nil })
+	for _, path := range []string{"missing", "-/npm/v1/security/advisories/bulk", "a/../b", "@s"} {
+		if _, _, err := e.FetchNPM(context.Background(), npmVirt("a"), path, "http://host", false); !errors.Is(err, ErrNotFound) {
+			t.Errorf("%q: want ErrNotFound, got %v", path, err)
+		}
+	}
+}
+
+func TestFetchNPMMemberLocalNotFound(t *testing.T) {
+	e := &Engine{getRemote: func(_ context.Context, name string) (*models.Remote, error) {
+		return &models.Remote{Name: name, RepoType: models.RepoTypeLocal}, nil
+	}}
+	e.NPMLocal = func(_ context.Context, _, pkg string) ([]byte, error) {
+		if pkg == "boom" {
+			return nil, errors.New("db down")
+		}
+		return nil, fmt.Errorf("wrapped: %w", ErrNotFound)
+	}
+	m, err := e.fetchNPMMember(context.Background(), "internal", "nope")
+	if err != nil || m.Doc != nil {
+		t.Fatalf("missing package must be an empty member, got %v %v", m, err)
+	}
+	if _, err := e.fetchNPMMember(context.Background(), "internal", "boom"); err == nil {
+		t.Fatal("local read errors must surface")
+	}
+}
+
+func TestMemberRedirectNPM(t *testing.T) {
+	e := npmEngine(nil)
+	virt := npmVirt("internal", "npmjs")
+	loc, ok, err := e.MemberRedirect(context.Background(), virt, "npmjs/@s/n/-/n-1.0.0.tgz", "", "http://host")
+	if err != nil || !ok || loc != "http://host/api/v1/remote/npmjs/@s/n/-/n-1.0.0.tgz" {
+		t.Fatalf("got %q %v %v", loc, ok, err)
+	}
+	if _, ok, _ := e.MemberRedirect(context.Background(), virt, "@s/n", "", "http://host"); ok {
+		t.Fatal("scoped packument path must not redirect")
+	}
+	if _, _, err := e.MemberRedirect(context.Background(), virt, "npmjs/%2e%2e/x.tgz", "", "http://host"); !errors.Is(err, ErrBadPath) {
+		t.Fatalf("want ErrBadPath, got %v", err)
+	}
+}
+
+func TestEvictOldestBoundsNPMMerges(t *testing.T) {
+	e := npmEngine(func(name, pkg string) (*NPMMember, error) {
+		return &NPMMember{RemoteName: name, Doc: mustJSON(t, npmDoc{Name: pkg, Versions: map[string]map[string]any{}})}, nil
+	})
+	for i := range maxNPMPackuments + 5 {
+		if _, _, err := e.FetchNPM(context.Background(), npmVirt("a"), fmt.Sprintf("p%d", i), "http://host", false); err != nil {
+			t.Fatal(err)
+		}
+	}
+	if len(e.gens) != maxNPMPackuments {
+		t.Fatalf("cached merges = %d, want %d", len(e.gens), maxNPMPackuments)
+	}
+	if _, ok := e.gens["npm\x00npm\x00p0\x00http://host"]; ok {
+		t.Fatal("oldest merge should be evicted")
+	}
+}

migrations/0004_puppet_metadata.sql

@@ -0,0 +1,15 @@
+CREATE TABLE IF NOT EXISTS puppet_metadata (
+	id            BIGSERIAL PRIMARY KEY,
+	repo_name     TEXT NOT NULL,
+	file_path     TEXT NOT NULL,
+	content_hash  TEXT NOT NULL,
+	slug          TEXT NOT NULL,
+	version       TEXT NOT NULL,
+	metadata_json TEXT NOT NULL,
+	file_size     BIGINT NOT NULL DEFAULT 0,
+	file_md5      TEXT NOT NULL,
+	created_at    TIMESTAMPTZ DEFAULT NOW(),
+	UNIQUE(repo_name, file_path)
+);
+
+CREATE INDEX IF NOT EXISTS idx_puppet_metadata_repo_slug ON puppet_metadata(repo_name, slug);

migrations/0005_helm_metadata.sql

@@ -0,0 +1,13 @@
+CREATE TABLE IF NOT EXISTS helm_metadata (
+	id           BIGSERIAL PRIMARY KEY,
+	repo_name    TEXT NOT NULL,
+	file_path    TEXT NOT NULL,
+	content_hash TEXT NOT NULL,
+	name         TEXT NOT NULL,
+	version      TEXT NOT NULL,
+	chart_yaml   TEXT NOT NULL,
+	created_at   TIMESTAMPTZ DEFAULT NOW(),
+	UNIQUE(repo_name, file_path)
+);
+
+CREATE INDEX IF NOT EXISTS idx_helm_metadata_repo ON helm_metadata(repo_name);

pkg/models/package_type.go

@@ -4,42 +4,10 @@ import "fmt"
 
 type PackageType string
 
-const (
-	PackageGeneric      PackageType = "generic"
-	PackageDocker       PackageType = "docker"
-	PackageHelm         PackageType = "helm"
-	PackagePyPI         PackageType = "pypi"
-	PackageNPM          PackageType = "npm"
-	PackageRPM          PackageType = "rpm"
-	PackageDeb          PackageType = "deb"
-	PackageAlpine       PackageType = "alpine"
-	PackagePuppet       PackageType = "puppet"
-	PackageTerraform    PackageType = "terraform"
-	PackageGoProxy      PackageType = "goproxy"
-	PackageCargo        PackageType = "cargo"
-	PackageNuGet        PackageType = "nuget"
-	PackageGitHubRPM    PackageType = "github_rpm"
-	PackageGitHubDeb    PackageType = "github_deb"
-	PackageGitHubAlpine PackageType = "github_alpine"
-)
+var validPackageTypes = map[PackageType]bool{}
 
-var validPackageTypes = map[PackageType]bool{
-	PackageGeneric:      true,
-	PackageDocker:       true,
-	PackageHelm:         true,
-	PackagePyPI:         true,
-	PackageNPM:          true,
-	PackageRPM:          true,
-	PackageDeb:          true,
-	PackageAlpine:       true,
-	PackagePuppet:       true,
-	PackageTerraform:    true,
-	PackageGoProxy:      true,
-	PackageCargo:        true,
-	PackageNuGet:        true,
-	PackageGitHubRPM:    true,
-	PackageGitHubDeb:    true,
-	PackageGitHubAlpine: true,
+func registerPackageType(p PackageType) {
+	validPackageTypes[p] = true
 }
 
 func (p PackageType) Valid() bool {

pkg/models/package_type_alpine.go

@@ -0,0 +1,5 @@
+package models
+
+const PackageAlpine PackageType = "alpine"
+
+func init() { registerPackageType(PackageAlpine) }

pkg/models/package_type_cargo.go

@@ -0,0 +1,5 @@
+package models
+
+const PackageCargo PackageType = "cargo"
+
+func init() { registerPackageType(PackageCargo) }

pkg/models/package_type_deb.go

@@ -0,0 +1,5 @@
+package models
+
+const PackageDeb PackageType = "deb"
+
+func init() { registerPackageType(PackageDeb) }