59 lines
2.2 KiB
Markdown
59 lines
2.2 KiB
Markdown
# auth
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Shared Go library with authentication primitives for all Shiny backend services.
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## Shared Documentation
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@../docs/claude/architecture.md
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@../docs/claude/go-services.md
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@../docs/claude/conventions.md
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## Library Information
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### Purpose
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Single home for the `user`-header auth and secret-startup-guard code that was
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previously byte-identical-copied into every backend (the `auth` package and
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`cmd/service/secrets_guard.go`). Enforces ADR-0005 (HMAC-signed `user` header,
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keyless fail-open only in acctest) and ADR-0006 (fail closed when required
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secrets are missing in `staging`/`production`).
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### Usage
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```go
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import "gitea.unbound.se/shiny/auth"
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// Fail closed on missing deployed secrets before serving (ADR-0005/0006).
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if missing := auth.MissingDeployedSecrets(environment, map[string]string{
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"USER_SIGNING_KEY": cfg.UserSigningKey,
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"INTERNAL_API_KEY": cfg.InternalAPIKey,
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}); len(missing) > 0 {
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log.Fatalf("refusing to start: missing secrets in %s: %v", environment, missing)
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}
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// Verify the gateway's signed user header and inject *User into the context.
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handler = auth.UserMiddleware([]byte(cfg.UserSigningKey))(handler)
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// Read the authenticated user downstream.
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user := auth.FromContext(ctx)
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if user.HasRole("admin") { /* ... */ }
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```
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### Exported API
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- `UserMiddleware(signingKey []byte)` — HTTP middleware verifying the
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HMAC-signed `user` header; injects `*User` into the request context.
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- `FromContext(ctx) *User`, `User.HasRole(...) bool`, `ContextKey`/`UserKey`.
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- `MissingDeployedSecrets(environment string, secrets map[string]string) []string`
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— returns the sorted names of secrets that are empty in `staging`/`production`
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(nil for any other environment, e.g. `development`/acctest).
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### Conventions
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Standard Shiny library scaffolding: `gofumpt`/`goimports -local`, golangci-lint,
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gitleaks and conventional-commit checks via pre-commit; coverage-regression gate
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in CI (`.testcoverage.yml`); releases auto-tagged from conventional commits by
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the shared Release workflow. Bump the consuming services' `go.mod` after a
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release. A breaking change to the signed-header or secret-guard contract is a
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cross-service change — see ADR-0005/0006 before changing it.
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