Add OpenInfraOpenId backend (#753)

Add a new backend that's functionally equivalent to the existing
OpenStackOpenId backend, but uses the id.openinfra.dev provider.

CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Added
 
+- Backend for OpenInfra OpenID
 - Facebook Limited Login backend
 
 ### Changed

social_core/backends/openinfra.py

@@ -0,0 +1,49 @@
+"""
+OpenInfra OpenId backend
+"""
+from urllib.parse import urlsplit
+
+from openid.extensions import ax
+
+from .open_id import OpenIdAuth
+
+
+class OpenInfraOpenId(OpenIdAuth):
+    name = "openinfra"
+    URL = "id.openinfra.dev"
+
+    def get_user_details(self, response):
+        """Generate username from identity url"""
+        values = super().get_user_details(response)
+        values["username"] = values.get("username") or urlsplit(
+            response.identity_url
+        ).path.strip("/")
+        values["nickname"] = values.get("nickname", "")
+        return values
+
+    def setup_request(self, params=None):
+        """Fetch email, firstname, lastname from openid"""
+        request = self.openid_request(params)
+
+        # TODO: use sreg instead ax request to fetch nickname as username
+        fetch_request = ax.FetchRequest()
+        fetch_request.add(
+            ax.AttrInfo(
+                "http://axschema.org/contact/email", alias="email", required=True
+            )
+        )
+
+        fetch_request.add(
+            ax.AttrInfo(
+                "http://axschema.org/namePerson/first", alias="firstname", required=True
+            )
+        )
+
+        fetch_request.add(
+            ax.AttrInfo(
+                "http://axschema.org/namePerson/last", alias="lastname", required=True
+            )
+        )
+
+        request.addExtension(fetch_request)
+        return request