Add nuget v3 remote type

- add `nuget` package type proxying a NuGet v3 feed, with `index.json` mapped to the upstream service index
- rewrite upstream-origin URLs in served JSON per request so flat container and registration lookups go through the remote
- treat `.nupkg`/`.nuspec` as immutable and indexes as mutable
- add a `nuget.config` usage snippet to the UI and a nuget e2e caching case

README.md

@@ -1,6 +1,6 @@
 # ArtifactAPI
 
-Caching proxy for package repositories. Single Go binary, 11 package types, content-addressable storage, managed by Terraform.
+Caching proxy for package repositories. Single Go binary, 12 package types, content-addressable storage, managed by Terraform.
 
 ## Quick Start
 
@@ -33,6 +33,7 @@ API: `http://localhost:8000` | Frontend: `http://localhost:5173`
 | `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.
@@ -279,20 +280,6 @@ 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.
 
-### Local cargo registry
-
-A local `cargo` repo is a private crate registry: it serves the sparse index and
-the Web API publish, yank and unyank endpoints, so `cargo publish` works against
-it directly.
-
-```toml
-[registries.<repo>]
-index = "sparse+https://artifactapi.k8s.syd1.au.unkin.net/api/v1/local/<repo>/"
-```
-
-cargo requires a token for publish/yank (`CARGO_REGISTRIES_<REPO>_TOKEN`); like
-other local repos, artifactapi does not check it.
-
 ## Access Control
 
 | Field | Default | Behaviour |

e2e-docker/README.md

@@ -23,12 +23,11 @@ already-running stack.
 
 - **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) proxied through the
+  helm, pypi, npm, rpm, alpine, puppet, terraform, goproxy, cargo, nuget) 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), cargo (publish,
-  sparse index, download, yank).
+  index), rpm (real package + **automatic repodata** generation).
 - **Virtual repositories** — pypi simple-index merge and helm `index.yaml` merge
   across two members.
 - **Mirrorlist** — an rpm remote with a `mirrorlist` of extra upstream mirrors

e2e-docker/caching_test.go

@@ -30,6 +30,7 @@ func TestCachingPerProvider(t *testing.T) {
 		{"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"},
 	}

e2e-docker/cargo_local_test.go

@@ -1,56 +0,0 @@
-//go:build dockere2e
-
-package e2edocker
-
-import (
-	"bytes"
-	"encoding/binary"
-	"net/http"
-	"strings"
-	"testing"
-)
-
-// TestLocalCargoRegistry publishes through the cargo Web API, then reads the
-// sparse index, downloads the crate and yanks it.
-func TestLocalCargoRegistry(t *testing.T) {
-	createRepo(t, `{"name":"local-cargo","package_type":"cargo","repo_type":"local"}`)
-	defer deleteRepo(t, "local-cargo")
-	base := api("/api/v1/local/local-cargo")
-
-	meta := `{"name":"e2e-crate","vers":"0.1.0","deps":[],"features":{}}`
-	crate := []byte("e2e crate bytes")
-	var body []byte
-	body = binary.LittleEndian.AppendUint32(body, uint32(len(meta)))
-	body = append(body, meta...)
-	body = binary.LittleEndian.AppendUint32(body, uint32(len(crate)))
-	body = append(body, crate...)
-
-	if resp, b := doRequest(t, http.MethodPut, base+"/api/v1/crates/new", body, "application/octet-stream"); resp.StatusCode != http.StatusOK {
-		t.Fatalf("publish: status %d: %s", resp.StatusCode, b)
-	}
-	if resp, _ := doRequest(t, http.MethodPut, base+"/api/v1/crates/new", body, "application/octet-stream"); resp.StatusCode != http.StatusConflict {
-		t.Fatalf("republish: status %d, want 409", resp.StatusCode)
-	}
-
-	resp, b := doRequest(t, http.MethodGet, base+"/config.json", nil, "")
-	if resp.StatusCode != http.StatusOK || !strings.Contains(string(b), `"api":"`) {
-		t.Fatalf("config.json: status %d: %s", resp.StatusCode, b)
-	}
-
-	resp, b = doRequest(t, http.MethodGet, base+"/e2/e-/e2e-crate", nil, "")
-	if resp.StatusCode != http.StatusOK || !strings.Contains(string(b), `"cksum":"`) || !strings.Contains(string(b), `"yanked":false`) {
-		t.Fatalf("index: status %d: %s", resp.StatusCode, b)
-	}
-
-	resp, b = doRequest(t, http.MethodGet, base+"/crates/e2e-crate/e2e-crate-0.1.0.crate", nil, "")
-	if resp.StatusCode != http.StatusOK || !bytes.Equal(b, crate) {
-		t.Fatalf("download: status %d", resp.StatusCode)
-	}
-
-	if resp, b := doRequest(t, http.MethodDelete, base+"/api/v1/crates/e2e-crate/0.1.0/yank", nil, ""); resp.StatusCode != http.StatusOK {
-		t.Fatalf("yank: status %d: %s", resp.StatusCode, b)
-	}
-	if _, b := doRequest(t, http.MethodGet, base+"/e2/e-/e2e-crate", nil, ""); !strings.Contains(string(b), `"yanked":true`) {
-		t.Fatalf("index after yank: %s", b)
-	}
-}

internal/api/v1/cargo.go

@@ -1,148 +0,0 @@
-package v1
-
-import (
-	"bytes"
-	"encoding/json"
-	"errors"
-	"fmt"
-	"io"
-	"log/slog"
-	"net/http"
-
-	"github.com/go-chi/chi/v5"
-
-	"git.unkin.net/unkin/artifactapi/internal/database"
-	"git.unkin.net/unkin/artifactapi/internal/provider"
-	"git.unkin.net/unkin/artifactapi/internal/provider/cargo"
-	"git.unkin.net/unkin/artifactapi/pkg/models"
-)
-
-// This file implements the cargo registry Web API (publish, yank, unyank) for
-// local cargo repositories. config.json points api at /api/v1/local/<repo>, so
-// cargo appends its own /api/v1/crates/... below that.
-
-const maxCratePublish = 64 << 20
-
-func (h *ProxyHandler) localCargoRemote(r *http.Request) (*models.Remote, bool) {
-	remote, err := h.db.GetRemote(r.Context(), chi.URLParam(r, "localName"))
-	if err != nil {
-		return nil, false
-	}
-	return remote, remote.RepoType == models.RepoTypeLocal && remote.PackageType == models.PackageCargo
-}
-
-func cargoError(w http.ResponseWriter, status int, format string, args ...any) {
-	w.Header().Set("Content-Type", "application/json")
-	w.WriteHeader(status)
-	_ = json.NewEncoder(w).Encode(map[string]any{
-		"errors": []map[string]string{{"detail": fmt.Sprintf(format, args...)}},
-	})
-}
-
-func cargoOK(w http.ResponseWriter, v any) {
-	w.Header().Set("Content-Type", "application/json")
-	w.WriteHeader(http.StatusOK)
-	_ = json.NewEncoder(w).Encode(v)
-}
-
-func (h *ProxyHandler) cargoPublish(w http.ResponseWriter, r *http.Request) {
-	remote, ok := h.localCargoRemote(r)
-	if !ok {
-		cargoError(w, http.StatusNotFound, "no local cargo registry %q", chi.URLParam(r, "localName"))
-		return
-	}
-	ctx := r.Context()
-
-	body, err := io.ReadAll(io.LimitReader(r.Body, maxCratePublish+1))
-	if err != nil {
-		cargoError(w, http.StatusBadRequest, "read body: %v", err)
-		return
-	}
-	if len(body) > maxCratePublish {
-		cargoError(w, http.StatusRequestEntityTooLarge, "publish body exceeds %d bytes", maxCratePublish)
-		return
-	}
-	meta, crate, err := cargo.ParsePublish(body)
-	if err != nil {
-		cargoError(w, http.StatusBadRequest, "%v", err)
-		return
-	}
-	line, err := cargo.NewIndexLine(meta, crate)
-	if err != nil {
-		cargoError(w, http.StatusBadRequest, "%v", err)
-		return
-	}
-
-	existing, err := h.db.ListCargoIndexEntries(ctx, remote.Name, meta.Name)
-	if err != nil {
-		cargoError(w, http.StatusInternalServerError, "%v", err)
-		return
-	}
-	for _, e := range existing {
-		if e.Name != meta.Name {
-			cargoError(w, http.StatusBadRequest, "crate %q already exists as %q", meta.Name, e.Name)
-			return
-		}
-		if e.Version == meta.Vers {
-			cargoError(w, http.StatusConflict, "crate version `%s@%s` already exists", meta.Name, meta.Vers)
-			return
-		}
-	}
-
-	lineJSON, err := json.Marshal(line)
-	if err != nil {
-		cargoError(w, http.StatusInternalServerError, "%v", err)
-		return
-	}
-
-	path := cargo.CratePath(meta.Name, meta.Vers)
-	result, err := h.cas.Store(ctx, bytes.NewReader(crate), "application/gzip")
-	if err != nil {
-		cargoError(w, http.StatusInternalServerError, "store failed: %v", err)
-		return
-	}
-	if err := h.db.UpsertBlob(ctx, result.ContentHash, result.S3Key, result.SizeBytes, "application/gzip"); err != nil {
-		cargoError(w, http.StatusInternalServerError, "record blob: %v", err)
-		return
-	}
-	if err := h.db.CreateLocalFile(ctx, remote.Name, path, result.ContentHash); err != nil {
-		if errors.Is(err, database.ErrAlreadyExists) {
-			cargoError(w, http.StatusConflict, "crate version `%s@%s` already exists", meta.Name, meta.Vers)
-			return
-		}
-		cargoError(w, http.StatusInternalServerError, "record file: %v", err)
-		return
-	}
-	entry := &provider.CargoIndexEntry{RepoName: remote.Name, FilePath: path, Name: meta.Name, Version: meta.Vers, Line: string(lineJSON)}
-	if err := h.db.InsertCargoIndexEntry(ctx, entry); err != nil {
-		// Drop the file so a retry is not rejected as a duplicate.
-		_ = h.db.DeleteLocalFile(ctx, remote.Name, path)
-		cargoError(w, http.StatusInternalServerError, "record index: %v", err)
-		return
-	}
-
-	slog.Info("cargo: published", "repo", remote.Name, "crate", meta.Name, "version", meta.Vers)
-	cargoOK(w, map[string]any{"warnings": map[string][]string{"invalid_categories": {}, "invalid_badges": {}, "other": {}}})
-}
-
-func (h *ProxyHandler) cargoYank(yanked bool) http.HandlerFunc {
-	return func(w http.ResponseWriter, r *http.Request) {
-		remote, ok := h.localCargoRemote(r)
-		if !ok {
-			cargoError(w, http.StatusNotFound, "no local cargo registry %q", chi.URLParam(r, "localName"))
-			return
-		}
-		name, version := chi.URLParam(r, "crate"), chi.URLParam(r, "version")
-		found, err := h.db.SetCargoYanked(r.Context(), remote.Name, name, version, yanked)
-		if err != nil {
-			cargoError(w, http.StatusInternalServerError, "%v", err)
-			return
-		}
-		if !found {
-			cargoError(w, http.StatusNotFound, "crate version `%s@%s` not found", name, version)
-			return
-		}
-		slog.Info("cargo: yank updated", "repo", remote.Name, "crate", name, "version", version, "yanked", yanked)
-		cargoOK(w, map[string]bool{"ok": true})
-	}
-}

internal/api/v1/proxy.go

@@ -1,6 +1,7 @@
 package v1
 
 import (
+	"bytes"
 	"errors"
 	"fmt"
 	"io"
@@ -41,9 +42,6 @@ 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}/api/v1/crates/new", h.cargoPublish)
-	r.Delete("/local/{localName}/api/v1/crates/{crate}/{version}/yank", h.cargoYank(true))
-	r.Put("/local/{localName}/api/v1/crates/{crate}/{version}/unyank", h.cargoYank(false))
 	r.Get("/virtual/{virtualName}/*", h.handleVirtual)
 	return r
 }
@@ -108,13 +106,24 @@ func (h *ProxyHandler) handleProxy(w http.ResponseWriter, r *http.Request) {
 	}
 	defer result.Reader.Close()
 
+	var body io.Reader = result.Reader
+	if sr, ok := prov.(provider.ServeRewriter); ok && prov.Classify(path) == provider.Mutable {
+		raw, err := io.ReadAll(result.Reader)
+		if err != nil {
+			http.Error(w, "bad gateway", http.StatusBadGateway)
+			return
+		}
+		raw = sr.RewriteServed(raw, *remote, fmt.Sprintf("%s://%s", scheme(r), r.Host))
+		body, result.Size = bytes.NewReader(raw), int64(len(raw))
+	}
+
 	w.Header().Set("Content-Type", result.ContentType)
 	w.Header().Set("X-Artifact-Source", result.Source)
 	if result.Size > 0 {
 		w.Header().Set("X-Artifact-Size", fmt.Sprintf("%d", result.Size))
 	}
 	w.WriteHeader(http.StatusOK)
-	io.Copy(w, result.Reader)
+	io.Copy(w, body)
 }
 
 func (h *ProxyHandler) handleProxyHead(w http.ResponseWriter, r *http.Request) {

internal/database/cargo_index.go

@@ -1,56 +0,0 @@
-package database
-
-import (
-	"context"
-	"strings"
-
-	"git.unkin.net/unkin/artifactapi/internal/provider"
-)
-
-func (db *DB) InsertCargoIndexEntry(ctx context.Context, e *provider.CargoIndexEntry) error {
-	_, err := db.Pool.Exec(ctx, `
-		INSERT INTO cargo_index (repo_name, file_path, name, version, line, yanked)
-		VALUES ($1, $2, $3, $4, $5, $6)
-	`, e.RepoName, e.FilePath, e.Name, e.Version, e.Line, e.Yanked)
-	return err
-}
-
-func (db *DB) ListCargoIndexEntries(ctx context.Context, repoName, name string) ([]provider.CargoIndexEntry, error) {
-	rows, err := db.Pool.Query(ctx, `
-		SELECT repo_name, file_path, name, version, line, yanked
-		FROM cargo_index
-		WHERE repo_name = $1 AND lower(name) = $2
-		ORDER BY id
-	`, repoName, strings.ToLower(name))
-	if err != nil {
-		return nil, err
-	}
-	defer rows.Close()
-
-	var result []provider.CargoIndexEntry
-	for rows.Next() {
-		var e provider.CargoIndexEntry
-		if err := rows.Scan(&e.RepoName, &e.FilePath, &e.Name, &e.Version, &e.Line, &e.Yanked); err != nil {
-			return nil, err
-		}
-		result = append(result, e)
-	}
-	return result, rows.Err()
-}
-
-// SetCargoYanked reports false when no such crate version exists.
-func (db *DB) SetCargoYanked(ctx context.Context, repoName, name, version string, yanked bool) (bool, error) {
-	tag, err := db.Pool.Exec(ctx, `
-		UPDATE cargo_index SET yanked = $4
-		WHERE repo_name = $1 AND lower(name) = $2 AND version = $3
-	`, repoName, strings.ToLower(name), version, yanked)
-	if err != nil {
-		return false, err
-	}
-	return tag.RowsAffected() > 0, nil
-}
-
-func (db *DB) DeleteCargoIndexEntry(ctx context.Context, repoName, filePath string) error {
-	_, err := db.Pool.Exec(ctx, `DELETE FROM cargo_index WHERE repo_name = $1 AND file_path = $2`, repoName, filePath)
-	return err
-}

internal/database/database_test.go

@@ -425,38 +425,3 @@ func TestRPMMetadata(t *testing.T) {
 		t.Fatalf("list rpm rows: %v %v", len(rows), err)
 	}
 }
-
-func TestCargoIndex(t *testing.T) {
-	requireDB(t)
-	for _, v := range []string{"0.1.0", "0.2.0"} {
-		if err := testDB.InsertCargoIndexEntry(ctx(), &provider.CargoIndexEntry{
-			RepoName: "cargo-db", FilePath: "crates/Unkin-Hello/Unkin-Hello-" + v + ".crate",
-			Name: "Unkin-Hello", Version: v, Line: `{"vers":"` + v + `"}`,
-		}); err != nil {
-			t.Fatal(err)
-		}
-	}
-
-	found, err := testDB.SetCargoYanked(ctx(), "cargo-db", "unkin-hello", "0.1.0", true)
-	if err != nil || !found {
-		t.Fatalf("yank: found=%v err=%v", found, err)
-	}
-	if found, _ := testDB.SetCargoYanked(ctx(), "cargo-db", "unkin-hello", "9.9.9", true); found {
-		t.Error("yank of a missing version reported found")
-	}
-
-	entries, err := testDB.ListCargoIndexEntries(ctx(), "cargo-db", "unkin-hello")
-	if err != nil {
-		t.Fatal(err)
-	}
-	if len(entries) != 2 || entries[0].Version != "0.1.0" || !entries[0].Yanked || entries[1].Yanked {
-		t.Fatalf("entries = %+v", entries)
-	}
-
-	if err := testDB.DeleteCargoIndexEntry(ctx(), "cargo-db", entries[0].FilePath); err != nil {
-		t.Fatal(err)
-	}
-	if entries, _ = testDB.ListCargoIndexEntries(ctx(), "cargo-db", "UNKIN-HELLO"); len(entries) != 1 {
-		t.Fatalf("after delete: %+v", entries)
-	}
-}

internal/provider/cargo/local.go

@@ -1,303 +0,0 @@
-package cargo
-
-import (
-	"context"
-	"crypto/sha256"
-	"encoding/binary"
-	"encoding/hex"
-	"encoding/json"
-	"errors"
-	"fmt"
-	"log/slog"
-	"net/http"
-	"strings"
-
-	"git.unkin.net/unkin/artifactapi/internal/provider"
-)
-
-// publishDep is a dependency as cargo sends it in the publish metadata.
-type publishDep struct {
-	Name               string   `json:"name"`
-	VersionReq         string   `json:"version_req"`
-	Features           []string `json:"features"`
-	Optional           bool     `json:"optional"`
-	DefaultFeatures    bool     `json:"default_features"`
-	Target             *string  `json:"target"`
-	Kind               string   `json:"kind"`
-	Registry           *string  `json:"registry"`
-	ExplicitNameInToml *string  `json:"explicit_name_in_toml"`
-}
-
-// PublishMeta is the JSON half of a `PUT /api/v1/crates/new` body; fields the
-// index does not carry are ignored.
-type PublishMeta struct {
-	Name        string              `json:"name"`
-	Vers        string              `json:"vers"`
-	Deps        []publishDep        `json:"deps"`
-	Features    map[string][]string `json:"features"`
-	Links       *string             `json:"links"`
-	RustVersion *string             `json:"rust_version"`
-}
-
-type indexDep struct {
-	Name            string   `json:"name"`
-	Req             string   `json:"req"`
-	Features        []string `json:"features"`
-	Optional        bool     `json:"optional"`
-	DefaultFeatures bool     `json:"default_features"`
-	Target          *string  `json:"target"`
-	Kind            string   `json:"kind"`
-	Registry        *string  `json:"registry,omitempty"`
-	Package         *string  `json:"package,omitempty"`
-}
-
-// IndexLine is one line of a sparse index file.
-type IndexLine struct {
-	Name        string              `json:"name"`
-	Vers        string              `json:"vers"`
-	Deps        []indexDep          `json:"deps"`
-	Cksum       string              `json:"cksum"`
-	Features    map[string][]string `json:"features"`
-	Features2   map[string][]string `json:"features2,omitempty"`
-	Yanked      bool                `json:"yanked"`
-	Links       *string             `json:"links,omitempty"`
-	V           int                 `json:"v,omitempty"`
-	RustVersion *string             `json:"rust_version,omitempty"`
-}
-
-// ParsePublish splits a publish body: u32le JSON length, JSON, u32le crate length, crate.
-func ParsePublish(body []byte) (PublishMeta, []byte, error) {
-	var meta PublishMeta
-	jsonBytes, rest, err := lengthPrefixed(body)
-	if err != nil {
-		return meta, nil, fmt.Errorf("metadata: %w", err)
-	}
-	crate, rest, err := lengthPrefixed(rest)
-	if err != nil {
-		return meta, nil, fmt.Errorf("crate: %w", err)
-	}
-	if len(rest) != 0 {
-		return meta, nil, errors.New("trailing bytes after crate")
-	}
-	if err := json.Unmarshal(jsonBytes, &meta); err != nil {
-		return meta, nil, fmt.Errorf("metadata: %w", err)
-	}
-	return meta, crate, nil
-}
-
-func lengthPrefixed(b []byte) ([]byte, []byte, error) {
-	if len(b) < 4 {
-		return nil, nil, errors.New("truncated length")
-	}
-	n := binary.LittleEndian.Uint32(b)
-	b = b[4:]
-	if uint64(n) > uint64(len(b)) {
-		return nil, nil, errors.New("truncated body")
-	}
-	return b[:n], b[n:], nil
-}
-
-// NewIndexLine validates the metadata and translates it into index form.
-func NewIndexLine(meta PublishMeta, crate []byte) (IndexLine, error) {
-	if !validName(meta.Name) {
-		return IndexLine{}, fmt.Errorf("invalid crate name %q", meta.Name)
-	}
-	if !validVersion(meta.Vers) {
-		return IndexLine{}, fmt.Errorf("invalid version %q", meta.Vers)
-	}
-	sum := sha256.Sum256(crate)
-	line := IndexLine{
-		Name:        meta.Name,
-		Vers:        meta.Vers,
-		Deps:        make([]indexDep, 0, len(meta.Deps)),
-		Cksum:       hex.EncodeToString(sum[:]),
-		Features:    map[string][]string{},
-		Links:       meta.Links,
-		RustVersion: meta.RustVersion,
-	}
-	for _, d := range meta.Deps {
-		dep := indexDep{
-			Name:            d.Name,
-			Req:             d.VersionReq,
-			Features:        d.Features,
-			Optional:        d.Optional,
-			DefaultFeatures: d.DefaultFeatures,
-			Target:          d.Target,
-			Kind:            d.Kind,
-			Registry:        d.Registry,
-		}
-		if dep.Features == nil {
-			dep.Features = []string{}
-		}
-		if dep.Kind == "" {
-			dep.Kind = "normal"
-		}
-		if d.ExplicitNameInToml != nil && *d.ExplicitNameInToml != "" {
-			pkg := d.Name
-			dep.Name, dep.Package = *d.ExplicitNameInToml, &pkg
-		}
-		line.Deps = append(line.Deps, dep)
-	}
-	// Older cargo cannot parse dep:/?/ feature syntax, so those features live in
-	// features2 behind v:2, as on crates.io.
-	for name, vals := range meta.Features {
-		if vals == nil {
-			vals = []string{}
-		}
-		if usesNewFeatureSyntax(vals) {
-			if line.Features2 == nil {
-				line.Features2 = map[string][]string{}
-			}
-			line.Features2[name] = vals
-			continue
-		}
-		line.Features[name] = vals
-	}
-	if line.Features2 != nil {
-		line.V = 2
-	}
-	return line, nil
-}
-
-func usesNewFeatureSyntax(vals []string) bool {
-	for _, v := range vals {
-		if strings.HasPrefix(v, "dep:") || strings.Contains(v, "?/") {
-			return true
-		}
-	}
-	return false
-}
-
-func validName(name string) bool {
-	if name == "" || len(name) > 64 {
-		return false
-	}
-	for i, c := range name {
-		alpha := (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')
-		if i == 0 && !alpha {
-			return false
-		}
-		if !alpha && (c < '0' || c > '9') && c != '-' && c != '_' {
-			return false
-		}
-	}
-	return true
-}
-
-func validVersion(v string) bool {
-	if v == "" || len(v) > 128 || !strings.ContainsAny(v[:1], "0123456789") {
-		return false
-	}
-	return strings.Trim(v, "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789.-+") == ""
-}
-
-// IndexPath is the sparse-index file path for a crate name.
-func IndexPath(name string) string {
-	n := strings.ToLower(name)
-	switch len(n) {
-	case 0:
-		return ""
-	case 1:
-		return "1/" + n
-	case 2:
-		return "2/" + n
-	case 3:
-		return "3/" + n[:1] + "/" + n
-	}
-	return n[:2] + "/" + n[2:4] + "/" + n
-}
-
-// CratePath is where a published .crate is stored, matching config.json's dl.
-func CratePath(name, version string) string {
-	return crateDir + name + "/" + name + "-" + version + ".crate"
-}
-
-// RenderIndex joins stored lines into an index file with each yanked flag applied.
-func RenderIndex(entries []provider.CargoIndexEntry) ([]byte, error) {
-	var b strings.Builder
-	for _, e := range entries {
-		var line IndexLine
-		if err := json.Unmarshal([]byte(e.Line), &line); err != nil {
-			return nil, fmt.Errorf("%s %s: %w", e.Name, e.Version, err)
-		}
-		line.Yanked = e.Yanked
-		raw, err := json.Marshal(line)
-		if err != nil {
-			return nil, err
-		}
-		b.Write(raw)
-		b.WriteByte('\n')
-	}
-	return []byte(b.String()), nil
-}
-
-// LocalConfig is config.json for a local registry rooted at base.
-func LocalConfig(base string) map[string]string {
-	return map[string]string{
-		"dl":  base + "/" + crateDir + "{crate}/{crate}-{version}.crate",
-		"api": base,
-	}
-}
-
-func (p *Provider) ServeLocalIndex(w http.ResponseWriter, r *http.Request, files provider.FileStore, repoName, path string) bool {
-	path = strings.TrimLeft(path, "/")
-	if path == "config.json" {
-		w.Header().Set("Content-Type", "application/json")
-		_ = json.NewEncoder(w).Encode(LocalConfig(requestBase(r) + "/api/v1/local/" + repoName))
-		return true
-	}
-	name := path[strings.LastIndex(path, "/")+1:]
-	if name == "" || IndexPath(name) != path {
-		return false
-	}
-
-	reader, ok := files.(provider.CargoIndexReader)
-	if !ok {
-		http.Error(w, "cargo index not available", http.StatusInternalServerError)
-		return true
-	}
-	entries, err := reader.ListCargoIndexEntries(r.Context(), repoName, name)
-	if err != nil {
-		http.Error(w, err.Error(), http.StatusInternalServerError)
-		return true
-	}
-	if len(entries) == 0 {
-		http.Error(w, "not found", http.StatusNotFound)
-		return true
-	}
-	body, err := RenderIndex(entries)
-	if err != nil {
-		http.Error(w, err.Error(), http.StatusInternalServerError)
-		return true
-	}
-	w.Header().Set("Content-Type", "text/plain")
-	w.WriteHeader(http.StatusOK)
-	_, _ = w.Write(body)
-	return true
-}
-
-func (p *Provider) GenerateLocalIndex(ctx context.Context, files provider.FileStore, repoName, path string) ([]byte, error) {
-	return nil, fmt.Errorf("cargo local index generation for virtual repos not supported")
-}
-
-func (p *Provider) AfterDelete(ctx context.Context, repoName, storagePath string, db provider.MetadataDeleter) error {
-	deleter, ok := db.(provider.CargoIndexDeleter)
-	if !ok {
-		return nil
-	}
-	if err := deleter.DeleteCargoIndexEntry(ctx, repoName, storagePath); err != nil {
-		slog.Error("cargo index: delete failed", "repo", repoName, "path", storagePath, "error", err)
-		return err
-	}
-	return nil
-}
-
-func requestBase(r *http.Request) string {
-	scheme := "http"
-	if r.TLS != nil {
-		scheme = "https"
-	} else if fwd := r.Header.Get("X-Forwarded-Proto"); fwd != "" {
-		scheme = fwd
-	}
-	return scheme + "://" + r.Host
-}

internal/provider/cargo/local_test.go

@@ -1,218 +0,0 @@
-package cargo
-
-import (
-	"context"
-	"crypto/sha256"
-	"encoding/binary"
-	"encoding/hex"
-	"encoding/json"
-	"net/http/httptest"
-	"strings"
-	"testing"
-
-	"git.unkin.net/unkin/artifactapi/internal/provider"
-)
-
-func publishBody(meta string, crate []byte) []byte {
-	var b []byte
-	b = binary.LittleEndian.AppendUint32(b, uint32(len(meta)))
-	b = append(b, meta...)
-	b = binary.LittleEndian.AppendUint32(b, uint32(len(crate)))
-	return append(b, crate...)
-}
-
-const sampleMeta = `{
-  "name": "unkin-hello", "vers": "0.2.0",
-  "deps": [
-    {"name": "serde", "version_req": "^1", "features": ["derive"], "optional": false,
-     "default_features": true, "target": null, "kind": "normal",
-     "registry": "https://github.com/rust-lang/crates.io-index"},
-    {"name": "rand_core", "version_req": "^0.6", "features": null, "optional": true,
-     "default_features": false, "target": "cfg(unix)", "kind": "dev",
-     "explicit_name_in_toml": "rc"}
-  ],
-  "features": {"default": ["std"], "std": [], "extra": ["dep:rc"], "weak": ["serde?/std"]},
-  "links": null, "rust_version": "1.70", "description": "ignored"
-}`
-
-func TestParsePublishAndIndexLine(t *testing.T) {
-	crate := []byte("fake crate bytes")
-	meta, gotCrate, err := ParsePublish(publishBody(sampleMeta, crate))
-	if err != nil {
-		t.Fatal(err)
-	}
-	if string(gotCrate) != string(crate) {
-		t.Fatalf("crate = %q", gotCrate)
-	}
-	line, err := NewIndexLine(meta, crate)
-	if err != nil {
-		t.Fatal(err)
-	}
-	sum := sha256.Sum256(crate)
-	if line.Cksum != hex.EncodeToString(sum[:]) {
-		t.Errorf("cksum = %s", line.Cksum)
-	}
-
-	raw, _ := json.Marshal(line)
-	var got map[string]any
-	_ = json.Unmarshal(raw, &got)
-	if _, ok := got["version_req"]; ok {
-		t.Error("publish-only field leaked into index line")
-	}
-	if got["v"] != float64(2) {
-		t.Errorf("v = %v, want 2 with features2 present", got["v"])
-	}
-	if got["rust_version"] != "1.70" {
-		t.Errorf("rust_version = %v", got["rust_version"])
-	}
-	if _, ok := line.Features["extra"]; ok {
-		t.Error("dep: feature must move to features2")
-	}
-	if len(line.Features2) != 2 || len(line.Features) != 2 {
-		t.Errorf("features = %v features2 = %v", line.Features, line.Features2)
-	}
-
-	deps := got["deps"].([]any)
-	serde := deps[0].(map[string]any)
-	if serde["req"] != "^1" || serde["registry"] != "https://github.com/rust-lang/crates.io-index" || serde["target"] != nil {
-		t.Errorf("serde dep = %v", serde)
-	}
-	if _, ok := serde["package"]; ok {
-		t.Error("package set without a rename")
-	}
-	renamed := deps[1].(map[string]any)
-	if renamed["name"] != "rc" || renamed["package"] != "rand_core" || renamed["kind"] != "dev" {
-		t.Errorf("renamed dep = %v", renamed)
-	}
-	if f, ok := renamed["features"].([]any); !ok || len(f) != 0 {
-		t.Errorf("null features must render as [], got %v", renamed["features"])
-	}
-}
-
-func TestIndexLineNoNewFeaturesOmitsV(t *testing.T) {
-	line, err := NewIndexLine(PublishMeta{Name: "a", Vers: "1.0.0", Features: map[string][]string{"x": nil}}, nil)
-	if err != nil {
-		t.Fatal(err)
-	}
-	raw, _ := json.Marshal(line)
-	s := string(raw)
-	for _, bad := range []string{`"v":`, `"features2"`, `"links"`} {
-		if strings.Contains(s, bad) {
-			t.Errorf("%s present in %s", bad, s)
-		}
-	}
-	if !strings.Contains(s, `"deps":[]`) || !strings.Contains(s, `"features":{"x":[]}`) {
-		t.Errorf("deps/features must be non-null: %s", s)
-	}
-}
-
-func TestParsePublishRejectsMalformed(t *testing.T) {
-	good := publishBody(`{"name":"a","vers":"1.0.0"}`, []byte("c"))
-	for name, body := range map[string][]byte{
-		"empty":     nil,
-		"short":     good[:len(good)-1],
-		"trailing":  append(append([]byte{}, good...), 'x'),
-		"bad json":  publishBody(`{`, []byte("c")),
-		"no length": good[:6],
-	} {
-		if _, _, err := ParsePublish(body); err == nil {
-			t.Errorf("%s: expected error", name)
-		}
-	}
-}
-
-func TestNewIndexLineValidation(t *testing.T) {
-	for _, m := range []PublishMeta{
-		{Name: "", Vers: "1.0.0"},
-		{Name: "1abc", Vers: "1.0.0"},
-		{Name: "../x", Vers: "1.0.0"},
-		{Name: "ok", Vers: "1.0.0/../../x"},
-		{Name: "ok", Vers: ""},
-		{Name: strings.Repeat("a", 65), Vers: "1.0.0"},
-	} {
-		if _, err := NewIndexLine(m, nil); err == nil {
-			t.Errorf("%q@%q accepted", m.Name, m.Vers)
-		}
-	}
-	if _, err := NewIndexLine(PublishMeta{Name: "Foo_bar-2", Vers: "1.0.0-rc.1+build.5"}, nil); err != nil {
-		t.Error(err)
-	}
-}
-
-func TestIndexPath(t *testing.T) {
-	for name, want := range map[string]string{
-		"a": "1/a", "ab": "2/ab", "abc": "3/a/abc", "Serde": "se/rd/serde", "unkin-hello": "un/ki/unkin-hello",
-	} {
-		if got := IndexPath(name); got != want {
-			t.Errorf("IndexPath(%q) = %q, want %q", name, got, want)
-		}
-	}
-}
-
-type fakeIndex struct {
-	entries []provider.CargoIndexEntry
-	asked   string
-}
-
-func (f *fakeIndex) ListCargoIndexEntries(_ context.Context, _, name string) ([]provider.CargoIndexEntry, error) {
-	f.asked = name
-	return f.entries, nil
-}
-func (f *fakeIndex) ListFilesByPrefix(context.Context, string, string) ([]provider.FileEntry, error) {
-	return nil, nil
-}
-func (f *fakeIndex) ListPackages(context.Context, string) ([]string, error) { return nil, nil }
-
-func TestServeLocalIndex(t *testing.T) {
-	line, _ := NewIndexLine(PublishMeta{Name: "unkin-hello", Vers: "0.1.0"}, []byte("x"))
-	raw, _ := json.Marshal(line)
-	files := &fakeIndex{entries: []provider.CargoIndexEntry{
-		{Name: "unkin-hello", Version: "0.1.0", Line: string(raw), Yanked: true},
-		{Name: "unkin-hello", Version: "0.2.0", Line: strings.Replace(string(raw), "0.1.0", "0.2.0", 1)},
-	}}
-	p := &Provider{}
-
-	rec := httptest.NewRecorder()
-	if !p.ServeLocalIndex(rec, httptest.NewRequest("GET", "http://aa.example/x", nil), files, "crates-local", "un/ki/unkin-hello") {
-		t.Fatal("index path not served")
-	}
-	lines := strings.Split(strings.TrimSpace(rec.Body.String()), "\n")
-	if len(lines) != 2 || !strings.Contains(lines[0], `"yanked":true`) || !strings.Contains(lines[1], `"yanked":false`) {
-		t.Errorf("index body = %q", rec.Body.String())
-	}
-	if files.asked != "unkin-hello" {
-		t.Errorf("looked up %q", files.asked)
-	}
-
-	rec = httptest.NewRecorder()
-	req := httptest.NewRequest("GET", "http://aa.example/config.json", nil)
-	req.Header.Set("X-Forwarded-Proto", "https")
-	p.ServeLocalIndex(rec, req, files, "crates-local", "config.json")
-	var cfg map[string]string
-	_ = json.Unmarshal(rec.Body.Bytes(), &cfg)
-	if cfg["api"] != "https://aa.example/api/v1/local/crates-local" ||
-		cfg["dl"] != "https://aa.example/api/v1/local/crates-local/crates/{crate}/{crate}-{version}.crate" {
-		t.Errorf("config = %v", cfg)
-	}
-
-	for _, path := range []string{"crates/unkin-hello/unkin-hello-0.1.0.crate", "xx/ki/unkin-hello", ""} {
-		if p.ServeLocalIndex(httptest.NewRecorder(), httptest.NewRequest("GET", "/", nil), files, "r", path) {
-			t.Errorf("%q should fall through", path)
-		}
-	}
-
-	files.entries = nil
-	rec = httptest.NewRecorder()
-	p.ServeLocalIndex(rec, httptest.NewRequest("GET", "/", nil), files, "r", "3/a/abc")
-	if rec.Code != 404 {
-		t.Errorf("unknown crate code = %d", rec.Code)
-	}
-}
-
-func TestCratePathMatchesDL(t *testing.T) {
-	dl := LocalConfig("http://h/api/v1/local/r")["dl"]
-	want := strings.NewReplacer("{crate}", "unkin-hello", "{version}", "0.1.0").Replace(dl)
-	if got := "http://h/api/v1/local/r/" + CratePath("unkin-hello", "0.1.0"); got != want {
-		t.Errorf("CratePath = %q, dl expands to %q", got, want)
-	}
-}

internal/provider/cargo_index.go

@@ -1,24 +0,0 @@
-package provider
-
-import "context"
-
-// CargoIndexEntry is one published crate version in a local cargo registry.
-// Line is the sparse-index JSON line; Yanked is applied when it is served.
-type CargoIndexEntry struct {
-	RepoName string
-	FilePath string
-	Name     string
-	Version  string
-	Line     string
-	Yanked   bool
-}
-
-// CargoIndexReader lists every version of one crate (matched case-insensitively).
-// *database.DB satisfies it and CargoIndexDeleter.
-type CargoIndexReader interface {
-	ListCargoIndexEntries(ctx context.Context, repoName, name string) ([]CargoIndexEntry, error)
-}
-
-type CargoIndexDeleter interface {
-	DeleteCargoIndexEntry(ctx context.Context, repoName, filePath string) error
-}

internal/provider/nuget/nuget.go

@@ -0,0 +1,85 @@
+// Package nuget proxies a NuGet v3 feed: the service index, registration pages
+// and flat container indexes are mutable, .nupkg/.nuspec downloads immutable.
+package nuget
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"net/url"
+	"strings"
+
+	"git.unkin.net/unkin/artifactapi/internal/auth"
+	"git.unkin.net/unkin/artifactapi/internal/provider"
+	"git.unkin.net/unkin/artifactapi/pkg/models"
+)
+
+func init() {
+	provider.Register(&Provider{})
+}
+
+// serviceIndex is the path clients use as their source URL; it maps to base_url.
+const serviceIndex = "index.json"
+
+type Provider struct{}
+
+func (p *Provider) Type() models.PackageType { return models.PackageNuGet }
+
+func (p *Provider) Classify(path string) provider.Mutability {
+	if isPackage(path) {
+		return provider.Immutable
+	}
+	return provider.Mutable
+}
+
+func (p *Provider) ContentType(path string) string {
+	switch {
+	case strings.HasSuffix(path, ".nupkg"):
+		return "application/octet-stream"
+	case strings.HasSuffix(path, ".nuspec"):
+		return "application/xml"
+	}
+	return "application/json"
+}
+
+// UpstreamURL maps index.json to base_url (the upstream service index) and any
+// other path to the same path on the base_url's origin, where nuget.org serves
+// v3-flatcontainer/ and v3/registration*/.
+func (p *Provider) UpstreamURL(remote models.Remote, path string) string {
+	path = strings.TrimLeft(path, "/")
+	if path == serviceIndex {
+		return remote.BaseURL
+	}
+	return origin(remote.BaseURL) + "/" + path
+}
+
+func (p *Provider) RewriteResponse(_ []byte, _ models.Remote, _ string) ([]byte, error) {
+	return nil, nil
+}
+
+// RewriteServed points upstream-origin URLs in cached JSON back at this remote.
+// It runs per request because the URLs must name the requesting host.
+func (p *Provider) RewriteServed(body []byte, remote models.Remote, proxyBaseURL string) []byte {
+	from := origin(remote.BaseURL)
+	if from == "" || !json.Valid(body) {
+		return body
+	}
+	to := strings.TrimRight(proxyBaseURL, "/") + "/api/v1/remote/" + remote.Name
+	return []byte(strings.ReplaceAll(string(body), from, to))
+}
+
+func (p *Provider) AuthHeaders(_ context.Context, remote models.Remote) (http.Header, error) {
+	return auth.BasicHeaders(remote), nil
+}
+
+func origin(baseURL string) string {
+	u, err := url.Parse(baseURL)
+	if err != nil || u.Host == "" {
+		return ""
+	}
+	return u.Scheme + "://" + u.Host
+}
+
+func isPackage(path string) bool {
+	return strings.HasSuffix(path, ".nupkg") || strings.HasSuffix(path, ".nuspec")
+}

internal/provider/nuget/nuget_test.go

@@ -0,0 +1,68 @@
+package nuget
+
+import (
+	"testing"
+
+	"git.unkin.net/unkin/artifactapi/internal/provider"
+	"git.unkin.net/unkin/artifactapi/pkg/models"
+)
+
+var _ provider.ServeRewriter = (*Provider)(nil)
+
+var nugetOrg = models.Remote{Name: "nuget-org", BaseURL: "https://api.nuget.org/v3/index.json"}
+
+func TestClassify(t *testing.T) {
+	p := &Provider{}
+	tests := []struct {
+		path string
+		want provider.Mutability
+	}{
+		{"v3-flatcontainer/newtonsoft.json/13.0.3/newtonsoft.json.13.0.3.nupkg", provider.Immutable},
+		{"v3-flatcontainer/newtonsoft.json/13.0.3/newtonsoft.json.nuspec", provider.Immutable},
+		{"v3-flatcontainer/newtonsoft.json/index.json", provider.Mutable},
+		{"v3/registration5-gz-semver2/newtonsoft.json/index.json", provider.Mutable},
+		{"index.json", provider.Mutable},
+	}
+	for _, tt := range tests {
+		if got := p.Classify(tt.path); got != tt.want {
+			t.Errorf("Classify(%q) = %v, want %v", tt.path, got, tt.want)
+		}
+	}
+}
+
+func TestUpstreamURL(t *testing.T) {
+	p := &Provider{}
+	tests := []struct {
+		path, want string
+	}{
+		{"index.json", "https://api.nuget.org/v3/index.json"},
+		{"/index.json", "https://api.nuget.org/v3/index.json"},
+		{"v3-flatcontainer/serilog/index.json", "https://api.nuget.org/v3-flatcontainer/serilog/index.json"},
+		{"v3/registration5-gz-semver2/serilog/index.json", "https://api.nuget.org/v3/registration5-gz-semver2/serilog/index.json"},
+	}
+	for _, tt := range tests {
+		if got := p.UpstreamURL(nugetOrg, tt.path); got != tt.want {
+			t.Errorf("UpstreamURL(%q) = %q, want %q", tt.path, got, tt.want)
+		}
+	}
+}
+
+func TestRewriteServed(t *testing.T) {
+	p := &Provider{}
+	body := `{"resources":[` +
+		`{"@id":"https://api.nuget.org/v3-flatcontainer/","@type":"PackageBaseAddress/3.0.0"},` +
+		`{"@id":"https://azuresearch-usnc.nuget.org/query","@type":"SearchQueryService"}]}`
+	want := `{"resources":[` +
+		`{"@id":"http://aa.example:8000/api/v1/remote/nuget-org/v3-flatcontainer/","@type":"PackageBaseAddress/3.0.0"},` +
+		`{"@id":"https://azuresearch-usnc.nuget.org/query","@type":"SearchQueryService"}]}`
+	if got := string(p.RewriteServed([]byte(body), nugetOrg, "http://aa.example:8000/")); got != want {
+		t.Errorf("RewriteServed =\n%s\nwant\n%s", got, want)
+	}
+	if got := string(p.RewriteServed([]byte(body), models.Remote{Name: "x"}, "http://aa.example")); got != body {
+		t.Error("remote without a parseable base_url must pass the body through")
+	}
+	cert := "\x30\x82https://api.nuget.org"
+	if got := string(p.RewriteServed([]byte(cert), nugetOrg, "http://aa.example")); got != cert {
+		t.Error("non-JSON bodies must pass through untouched")
+	}
+}

internal/provider/provider.go

@@ -75,6 +75,13 @@ 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 {

internal/server/server.go

@@ -29,6 +29,7 @@ import (
 	_ "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"

migrations/0003_cargo_index.sql

@@ -1,15 +0,0 @@
--- Local cargo registries: one sparse-index line per published crate version.
--- line holds the index JSON minus yanked, which flips on yank/unyank.
-CREATE TABLE IF NOT EXISTS cargo_index (
-	id           BIGSERIAL PRIMARY KEY,
-	repo_name    TEXT NOT NULL,
-	file_path    TEXT NOT NULL,
-	name         TEXT NOT NULL,
-	version      TEXT NOT NULL,
-	line         TEXT NOT NULL,
-	yanked       BOOLEAN NOT NULL DEFAULT FALSE,
-	created_at   TIMESTAMPTZ DEFAULT NOW(),
-	UNIQUE(repo_name, file_path)
-);
-
-CREATE INDEX IF NOT EXISTS idx_cargo_index_repo_name ON cargo_index(repo_name, lower(name));

pkg/models/package_type.go

@@ -17,6 +17,7 @@ const (
 	PackageTerraform    PackageType = "terraform"
 	PackageGoProxy      PackageType = "goproxy"
 	PackageCargo        PackageType = "cargo"
+	PackageNuGet        PackageType = "nuget"
 	PackageGitHubRPM    PackageType = "github_rpm"
 	PackageGitHubDeb    PackageType = "github_deb"
 	PackageGitHubAlpine PackageType = "github_alpine"
@@ -35,6 +36,7 @@ var validPackageTypes = map[PackageType]bool{
 	PackageTerraform:    true,
 	PackageGoProxy:      true,
 	PackageCargo:        true,
+	PackageNuGet:        true,
 	PackageGitHubRPM:    true,
 	PackageGitHubDeb:    true,
 	PackageGitHubAlpine: true,

pkg/models/package_type_test.go

@@ -19,6 +19,7 @@ func TestPackageTypeValid(t *testing.T) {
 		models.PackageTerraform,
 		models.PackageGoProxy,
 		models.PackageCargo,
+		models.PackageNuGet,
 		models.PackageGitHubRPM,
 		models.PackageGitHubDeb,
 		models.PackageGitHubAlpine,

ui/src/components/UsageInstructions.tsx

@@ -229,25 +229,6 @@ go mod download`,
       ];
 
     case 'cargo':
-      if (isLocal) {
-        return [
-          {
-            title: 'Add the private registry (real sparse registry)',
-            language: 'toml',
-            code: `# $CARGO_HOME/config.toml
-[registries.${name}]
-index = "sparse+${url}/api/v1/local/${name}/"`,
-            note: 'cargo requires a token for publish/yank: set CARGO_REGISTRIES_' + name.toUpperCase().replace(/-/g, '_') + '_TOKEN to any value.',
-          },
-          {
-            title: 'Publish, depend on and yank crates',
-            language: 'bash',
-            code: `cargo publish --registry ${name}
-cargo add <crate> --registry ${name}
-cargo yank --version <version> --registry ${name}`,
-          },
-        ];
-      }
       return [
         {
           title: 'Point crates.io at this sparse registry',
@@ -262,6 +243,22 @@ index = "sparse+${proxy}/"`,
         },
       ];
 
+    case 'nuget':
+      return [
+        {
+          title: 'Use this feed instead of nuget.org',
+          language: 'xml',
+          code: `<!-- nuget.config -->
+<configuration>
+  <packageSources>
+    <clear />
+    <add key="${name}" value="${proxy}/index.json" protocolVersion="3" />
+  </packageSources>
+</configuration>`,
+          note: 'Serve artifactapi over HTTPS: NuGet rejects the repository signatures resource over plain HTTP.',
+        },
+      ];
+
     case 'puppet':
       return [
         {

ui/src/pages/Locals.tsx

@@ -18,6 +18,7 @@ const typeColors: Record<string, 'blue' | 'green' | 'yellow' | 'red' | 'default'
   terraform: 'blue',
   goproxy: 'green',
   cargo: 'yellow',
+  nuget: 'blue',
 };
 
 export function Locals() {

ui/src/pages/Remotes.tsx

@@ -18,6 +18,7 @@ const typeColors: Record<string, 'blue' | 'green' | 'yellow' | 'red' | 'default'
   terraform: 'blue',
   goproxy: 'green',
   cargo: 'yellow',
+  nuget: 'blue',
 };
 
 export function Remotes() {