PathTemplate auth/token hardcoded in OAuth2Client ExchangeTokenAsync method

[stefanmilivojevic91]

Token endpoint path should be fetched from issuer's openid configuration (.well-known/openid-configuration) endpoint. AzureAD has oauth2/token for instance and OAuth2Client is unable to fetch access token using client credentials flow (FgaApiNotFoundError exception is thrown).
https://github.com/openfga/dotnet-sdk/blob/main/src/OpenFga.Sdk/ApiClient/OAuth2Client.cs#L122

[rhamzeh]

Thanks for raising the issue @stefanmilivojevic91 !

[rhamzeh]

@stefanmilivojevic91 if we allowed you to specify the token endpoint itself, will that be enough to resolve your issue?

Basically, if you set ApiTokenIssuer with a path, we will no longer append /oauth/token.

So:

ApiTokenIssuer	Endpoint SDK will hit
issuer.fga.example	https://issuer.fga.example/oauth/token
https://issuer.fga.example	https://issuer.fga.example/oauth/token
issuer.fga.example/some_endpoint	https://issuer.fga.example/some_endpoint
https://issuer.fga.example/some_endpoint	https://issuer.fga.example/some_endpoint

[stefanmilivojevic91]

@rhamzeh My apologies for the delayed response, I think that will do the job, thanks :)

[mdimovskihtec]

@rhamzeh Hi, maybe allow overriding of the endpoint? That should allow for more customization, because I think it does not cover the case for oauth2 endpoints. For example, the oauth2 endpoint in Azure is oauth2/v2.0/token