Add exp claim to generated JWTs
#8
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This PR makes it so that JWTs are created with an
expclaim of 5 minutes into the future. JWTs are only used to obtain the session, and should be short-lived.On https://embedding-demo.metabase.com/, the iframe gets generated with a token like the following (truncated):
This decodes to:
{ "id": 1000000, "first_name": "Mary", "last_name": "Smith", "email": "[email protected]", "occupation": "teacher", "avatar": "/images/mary-smith.png", "groups": [ "Professors" ], "professor_id": 1, "expiresIn": "2 days", "iat": 1755202561 }The
expiresInclaim has no meaning to Metabase or to the JWT spec. Because there is noexpclaim in this token, Metabase will consider it as never expiring, and it can be re-used forever to obtain a new session until the JWT secret is rotated.