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fix(oauth2): validate Firebase issuer/subject and warn on omitted audience in verify_firebase_token - #18777
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…omitted in verify_firebase_token
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This pull request enhances security in both the synchronous and asynchronous implementations of verify_firebase_token by validating the token's audience (aud) and issuer (iss) claims. It also introduces a warning when the function is called without an audience, as this can be insecure. Comprehensive unit tests have been added to verify these validations and warnings. I have no additional feedback to provide as the changes are well-implemented and properly tested.
…ngs, and test coverage
…uired in a future release
macastelaz
changed the title
…ypeErrors in jwt.decode
…dience warning and docstring
daniel-sanche
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Nov 6, 2026
daniel-sanche
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LGTM, with a docstring suggestion
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Validates that the decoded Firebase ID token contains non-empty string
audandsubclaims and thatissmatcheshttps://securetoken.google.com/<aud>, and emits aUserWarningwhenaudienceis omitted inverify_firebase_token()(both sync and async).