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feat: distinguish identity scope not granted from identity fetch failure - #131
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Identity handlers raised IdentityFetchError for every failure. A caller could not tell a scope the user never granted from an endpoint that was down. The first needs a fallback or re-consent. The second needs a retry. Add IdentityScopeNotGrantedError as a subclass of IdentityFetchError, so existing except clauses still catch it. A provider handler raises it only where it can identify a missing scope. Refs #127
An identity handler could not see which scopes the token endpoint granted. It could not tell a token that lacks the identity scope from a token the provider rejected for another reason. Add the granted scope string to IdentityMaterial and copy it from TokenSet.scope. The string keeps the provider's own separator, so a handler parses it with the configured scope separator. Refs #127
Typeform's /me endpoint needs the accounts:read scope. Typeform answers a missing scope and an invalid token with the same 403, so the handler raised the generic error for both. When the token's granted scopes are known, expand them with the configured implicit scopes and raise IdentityScopeNotGrantedError before the request if accounts:read is absent. A missing or blank scope string means the grant is unknown. In that case the handler makes the request as before, so any failure still raises IdentityFetchError. Also raise IdentityFetchError for a response body that is not a JSON object. Refs #127
The Sign-in-with-Slack userInfo call reports a scope the token lacks as ok=false with error missing_scope. The handler raised the generic error for it, the same as for a revoked or invalid token. Raise IdentityScopeNotGrantedError for missing_scope. Every other ok=false error still raises IdentityFetchError. Refs #127
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Included review availability: This review used your included allowance. Your plan provides up to 1 included review per hour; 0 remain after this review. WalkthroughIdentity material now includes granted scopes. The error hierarchy distinguishes known missing identity scopes from other identity-fetch failures. Typeform checks known grants before requesting identity, and Slack maps ChangesIdentity scope handling
Priority: ➖ Normal Change: Feature · Severity of issue fixed: Medium Merge Risk: ⚪ Minimal · up to The PR lets identity handlers distinguish known missing scopes from other fetch failures, with Typeform checks and Slack error mapping. No actionable merge-blocking risk remains in the supplied review context. Security Architecture ReviewSecurity architecture risk: ⚪ Minimal · up to The reviewed changes preserve existing credential boundaries and provider enforcement. Missing-scope errors remain compatible with existing exception handling, unknown grants are not guessed, and Slack’s existing workspace recovery path is preserved. No material security risk was found in the changed design. Retained concerns Security review detailsSecurity Blast Radius
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Full details: Docstring CoverageExplanation Docstring coverage is 23.33% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 30 functions across 11 files. (1 skipped: 1 unsupported.)
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Review comments at @README.md:
- Around line 607-608: Re-pad the IdentityFetchError and
IdentityScopeNotGrantedError rows to match the Markdown table’s column widths
and surrounding row style.
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README.mdsrc/apron_auth/__init__.pysrc/apron_auth/client.pysrc/apron_auth/errors.pysrc/apron_auth/models.pysrc/apron_auth/providers/slack.pysrc/apron_auth/providers/typeform.pytests/providers/test_slack.pytests/providers/test_typeform.pytests/test_client.pytests/test_errors.pytests/test_models.py
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The IdentityScopeNotGrantedError row is wider than the table's first column, so the raw Markdown no longer lined up. Re-pad every row to the new column width. The rendered table is unchanged. Refs #127
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Summary
Identity handlers raised
IdentityFetchErrorfor every failure. A caller could not tell a scope the user never granted (permanent: fall back or get a new token) from an endpoint that failed (transient: retry). The only way to tell them apart was matching message text.This PR follows the proposal in #127:
IdentityScopeNotGrantedError, a subclass ofIdentityFetchError. Existingexcept IdentityFetchErrorcode keeps working.IdentityMaterial, so a handler can see what the token endpoint granted.Typeform
Typeform's documented errors give the same
403for a missing scope and an invalid token, so the response cannot be used. The handler checks the granted scopes before the request instead:scope): the scopes are split withconfig.scope_separatorand expanded withconfig.resolve_implicit_scopes. Ifaccounts:readis absent, the handler raisesIdentityScopeNotGrantedErrorwithout a request.Noneor blankscope): the handler makes the request as before. Any failure raisesIdentityFetchError.The handler does not guess a grant from
ProviderConfig.scopes. A token from storage, from a refresh, or from an older config can holdaccounts:readwhile the current config does not list it. A guess there would turn a working token into a false permanent error.The handler now also raises
IdentityFetchErrorwhen the response body is not a JSON object. Before, it raised a rawAttributeError.Slack
The Sign-in-with-Slack
userInfocall reports a missing scope asok=false,error="missing_scope". That now raisesIdentityScopeNotGrantedError. Otherok=falseerrors still raiseIdentityFetchError. On the workspace-bot path,team.info'smissing_scopestays recoverable throughauth.test. A note at that site records this.Not in this PR
read:meis missing.scopeattribute on the exception. Slack cannot name the missing scope, so this waits until a caller needs it.WWW-Authenticate: error="insufficient_scope"header for other providers. It is not yet confirmed which providers send it.Changes
src/apron_auth/errors.py,src/apron_auth/__init__.py: the new exception, exported.IdentityFetchError's docstring now says the failure may be transient.src/apron_auth/models.py:IdentityMaterial.scope, copied fromTokenSet.scope.TokenSet.scopeis documented as delimited by the provider's separator, not always by spaces.src/apron_auth/client.py: thefetch_identitydocstring lists the granted scopes as part of the narrowed material.src/apron_auth/providers/typeform.py: the scope check and the JSON object guard.src/apron_auth/providers/slack.py: themissing_scopemapping and a named constant.README.md: the error table lists both identity errors.403(generic error), comma separator, implicit scope,403with the scope granted (generic error), non-object JSON, Slackmissing_scopeand other errors, and passthrough of the error fromOAuthClient.fetch_identity.Closes #127
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