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unkin-agent ff2dff7af2
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Add optional methods attribute to the arrstack role resource (#3)
## Why

Engine plugin v0.2.0 added a `methods` field to arrstack roles, pinning a minted arrproxy key to a set of HTTP methods so a read-only integration can be handed a key that cannot write. The provider had no way to express it, so those roles could not be managed from `terraform-vault`.

## How

- Adds an optional `methods` set attribute to `arrstack_secret_backend_role`, validated at plan time against `GET/HEAD/POST/PUT/PATCH/DELETE/OPTIONS` (upper case only, since the engine stores them upper-cased and a lower-case value would drift on every plan).
- Always writes `methods`: the engine only clears an existing scope when the key is present, so an omitted key would leave a stale scope behind.
- Reads an unrestricted role back as null rather than an empty set, so a config that omits `methods` shows no drift; a scope cleared out of band still surfaces as a diff.
- Documents the attribute in the README and both example configs.
- Tests cover the write mapping (null and populated), the read-back cases (absent/empty/null/cleared), and the plan-time validator.

Dependency: engine plugin >= 0.2.0.
Reviewed-on: #3
Co-authored-by: unkin-agent <unkin-agent@unkin.net>
Co-committed-by: unkin-agent <unkin-agent@unkin.net>
2026-08-30 17:05:47 +10:00
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