[Question] Client credentials grant in the GenericProvider

[gdbonino]

I am using this library through knpuniversity/oauth2-client-bundle to log in users to my own oAuth2 server. This works great.

The problem I have is that when I want to directly use the Provider configured to get an access token using client_credentials from the command line, the oAuth2 server bounces me.

What I could verify is that when running the command, the redirect_uri does not contain the correct URL as the command does not have the context to generate the URL (Symfony routing). Obviously, a solution would be to set the redirect_uri by hand. But reading the oAuth2 documentation, when using client_credentials, it is not necessary to send redirect_uri.

To solve this, I made a local provider by extending GenericProvider and just overwriting getAccessToken to remove the redirect_uri param when it is client_credentials.

Is what I'm doing correct? If so, I can generate a PR to adjust the functionality directly in GenericProvider.