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+---
+summary: Authenticate against an external OAuth 2 IdP
+labels:
+- Stage-Alpha
+---
+
+This module provides external authentication via an external [AOuth
+2](https://datatracker.ietf.org/doc/html/rfc7628) authorization server
+and supports the [SASL OAUTHBEARER authentication][rfc7628]
+mechanism.
+
+# How it works
+
+Clients retrieve tokens somehow, then show them to Prosody, which asks
+the Authorization server to validate them, returning info about the user
+back to Prosody.
+
+# Configuration
+
+`oauth_external_discovery_url`
+: Optional URL string pointing to [OAuth 2.0 Authorization Server
+ Metadata](https://oauth.net/2/authorization-server-metadata/). Lets
+ clients discover where they should retrieve access tokens from if
+ they don't have one yet.
+
+`oauth_external_validation_endpoint`
+: URL string. The token validation endpoint, should validate the token
+ and return a JSON structure containing the username of the user
+ logging in the field specified by `oauth_external_username_field`.
+ Commonly the [OpenID `UserInfo`
+ endpoint](https://openid.net/specs/openid-connect-core-1_0.html#UserInfo)
+
+`oauth_external_username_field`
+: String. Default is `"preferred_username"`. Field in the JSON
+ structure returned by the validation endpoint that contains the XMPP
+ localpart.
+
+# Compatibility
+
+ Version Status
+ --------- ---------------
+ trunk works
+ 0.12.x does not work
+ 0.11.x does not work