feat(api): Advertise required scopes on token-scope 403s (RFC 6750)#118612
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When a token-authorized request is denied because its scopes do not cover the endpoint's required scopes, return an RFC 6750 insufficient_scope challenge in the WWW-Authenticate header instead of a bare 403. The required scopes come from the endpoint's own scope_map, surfaced from the single shared token-scope gate (ScopedPermission.has_permission), so every token-scoped endpoint benefits with no per-class edits. The response body is unchanged and the behavior is a no-op for non-token auth and for 401s, so this is non-breaking. Sentry's custom_exception_handler already forwards an exception's auth_header onto WWW-Authenticate, so the transport is reused as-is. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Summary
When a token-authorized request is denied for lacking the required scope, Sentry returns a
bare
403 {"detail": "You do not have permission to perform this action."}— it never sayswhich scope was needed. This adopts the OAuth 2.0 standard answer (RFC 6750
insufficient_scope) so callers know what they're missing:The required scopes come from the endpoint's own
scope_map, surfaced from the singleshared token-scope gate (
ScopedPermission.has_permission), so every token-scopedendpoint gets it with no per-class edits.
Why it's safe / non-breaking
403body is unchanged — the scope info rides only in theWWW-Authenticateheader, so clients parsing
{"detail": ...}are unaffected.401authentication failures.custom_exception_handlercopies an exception'sauth_headerontoWWW-Authenticate(it even cited RFC 6750).scope_mapand the API docs). The denial fires at the view level before the org/object is loaded,
so it leaks no resource existence; it never enumerates the caller's held scopes.
Non-goals
has_object_permission) are not enriched yet — deliberate,to keep the blast radius small. The view-level gate covers the motivating cases.
Tests
tests/sentry/api/test_permissions.py: unit (the raise + exact header at the permissionboundary) and end-to-end (header reaches the HTTP response; body unchanged; no header
on
401, on session denial, or on success).Spec:
openspec/changes/add-insufficient-scope-errors/.🤖 Generated with Claude Code