Fidesops Can't Login: Base64 Regression

[pattisdr]

Bug Description

The Fideslib models PR #700 which started using FidesUser instead of FidesopsUser introduced a regression so now we're no longer expecting passwords to be base64 encoded in the API. https://github.com/ethyca/fidesops/pull/749/files

We're in a weird state right now, because the front end is base64 encoding the passwords before sending them to the backend but the backend is now assuming they are being sent plain, because we switched to using a Fideslib schema that didn't have the base64 code.

Two things:

• Fideslib should be updated to add the b64 pieces from this PR https://github.com/ethyca/fidesops/pull/749/files. Base64 Encoding in Fideslib fideslib#43
• Fidesops should be updated to expect passwords to be base64 encoded on input

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