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How can you securely implement token revocation in a FastAPI OAuth2 password flow application?

hard🚀 Application Q9 of 15
FastAPI - Authentication and Security
How can you securely implement token revocation in a FastAPI OAuth2 password flow application?
AMaintain a server-side blacklist of revoked tokens and check it on each request
BEncode revocation info inside JWT token payload
CUse OAuth2PasswordRequestForm to revoke tokens automatically
DSet token expiration to a very long time to avoid revocation
Step-by-Step Solution
Solution:

  1. Step 1: Understand token revocation challenge

    JWT tokens are stateless, so revocation requires server-side tracking.

  2. Step 2: Use blacklist to track revoked tokens

    Maintaining a blacklist allows the server to reject revoked tokens on each request.

  3. Final Answer:

    Maintain a server-side blacklist of revoked tokens and check it on each request -> Option A

  4. Quick Check:

    Blacklist revoked tokens server-side for security [OK]
Quick Trick: Use server-side blacklist to revoke tokens securely [OK]
Common Mistakes:
MISTAKES
  • Trying to revoke tokens inside JWT payload
  • Expecting OAuth2PasswordRequestForm to handle revocation
  • Setting very long token expiration to avoid revocation

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