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Add support rfc7523 private_key_jwt in client credentials flow

44

Implement JSON Web Token Profile for OAuth 2.0 Client Authentication in client credentials flow. See https://tools.ietf.org/html/rfc7523 See https://openid.net/specs/openid-connect-core-1_0.html Fixes #433

Support rfc 7523

1

Current implementation client authentication with jwt is not supported rfc 7523 Client Authentication. In https://github.com/golang/oauth2/blob/master/jwt/jwt.go token request likes as ``` POST /token.oauth2 HTTP/1.1 Host: as.example.com Content-Type: application/x-www-form-urlencoded grant_type=urn%3Aietf%3Aparams%3Aoauth%3Agrant-type%3Ajwt-bearer &assertion=eyJhbGciOiJFUzI1NiJ9.... ```...

How aggregate collection element for filling data about linked resource?

1

I prepared an example. Suppose I have `users` backend service with those API endpoints: * Get concrete user `GET /users/{user_id}` that responses with: ```json { "id": "34", "name": "Bob" }...