Add OIDC back channel logout

[mfolker-sage]

Changes

Support for setting Back-Channel Logout URI's and initiators on all clients.

References

Implement support for Auth0 API endpoints here:

Back-Channel Logout URI

Testing

I have tested the changes to the SDK and validated they generate valid JSON, i.e.

{"app_type":"native","token_endpoint_auth_method":"client_secret_post","client_metadata":{"Prop1":"1","Prop2":"2"},"is_first_party":true,"name":"int-test C9qIfV3RKUueJGflFsptA","oidc_logout":{"backchannel_logout_urls":["https://logout.com"],"backchannel_logout_initiators":{"mode":"custom","selected_initiators":["rp-logout","idp-logout"]}}}

And

{"app_type":"native","token_endpoint_auth_method":"client_secret_post","client_metadata":{"Prop1":"1","Prop2":"2"},"is_first_party":true,"name":"int-test GxRjxrHRhkqGpr1QZNGgBA","oidc_logout":{"backchannel_logout_urls":["https://logout.com"],"backchannel_logout_initiators":{"mode":"all"}}}

I have tested this JSON directly against the Auth0 management API.

I am unable to run the tests locally as the documentation is not clear, creating client-secrets.json does not result in values being read from that file. A clearer read me would be appreciated.

Checklist

• [X ] I have read the Auth0 general contribution guidelines

• [X ] I have read the Auth0 Code of Conduct

• [X ] All existing and new tests complete without errors

[frederikprijck]

Thanks for the PR.

I am unable to run the tests locally as the documentation is not clear, creating client-secrets.json does not result in values being read from that file. A clearer read me would be appreciated.

You are unable to run all tests locally, as u need a heavily configured enterprise tenant. What you can do is run your own few tests locally and pass the correct values for your own tenant. But I am happy to look at that.

[frederikprijck]

Thanks 🚀