mod_auth_oauth_external: Allow different username in PLAIN vs final JID Mastodon for example having email addresses usernames in login, but a different username in the service itself. Thanks to @tcit@social.tcit.fr for the pointer to a usable validation endpoint for Mastodon, allowing this to be tested.

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labels:
- 'Type-Auth'
summary: SASL OAuthBearer Mechanism
...

Introduction
============

This module adds a new SASL mechanism OAUTHBEARER, as defined in [RFC-7628](https://tools.ietf.org/html/rfc7628).

It's intended to be used together with the `mod_auth_oauthbearer.lua` module.