[TYPO3-dev] How to check credentials for FE-user?

[Jost Baron]

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Hi!

Given a username/password combination, how do I check in an extension
if this user exists and if the password is correct?

The goal is to create an integration with an OpenID provider, where
the TYPO3 database is used to check the credentials. In order to do
that, I want to build an extension that gets username and password as
JSON (via HTTPS), and then tells the requester if the credentials are
correct.

Regards,
Jost
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