move SocialAccount population to the separate method in the SocialLoginSerializer.

It makes easier to get the correct signup for custom user models, because application can subclass SocialLoginSeriaLizer and add required fields to the instance.

rest_auth/registration/serializers.py

@@ -5,36 +5,49 @@ from allauth.socialaccount.helpers import complete_social_login
 
 
 class SocialLoginSerializer(serializers.Serializer):
-
     access_token = serializers.CharField(required=True)
 
+    def _get_request(self):
+        request = self.context.get('request')
+        if not isinstance(request, HttpRequest):
+            request = request._request
+        return request
+
+    def get_social_account(self, adapter, app, token, response):
+        """
+
+        :param adapter: allauth.socialaccount Adapter subclass. Usually OAuthAdapter or Auth2Adapter
+        :param app: `allauth.socialaccount.SocialApp` instance
+        :param token: `allauth.socialaccount.SocialToken` instance
+        :param response: Provider's response for OAuth1. Not used in the
+        :return: :return: A populated instance of the `allauth.socialaccount.SocialLogin` instance
+        """
+        request = self._get_request()
+        social_login = adapter.complete_login(request, app, token, response=response)
+        social_login.token = token
+        return social_login
+
     def validate(self, attrs):
         access_token = attrs.get('access_token')
         view = self.context.get('view')
-        request = self.context.get('request')
-        if not isinstance(request, HttpRequest):
-            request = request._request
+        request = self._get_request()
 
         if not view:
             raise serializers.ValidationError(
                 'View is not defined, pass it as a context variable'
             )
 
-        self.adapter_class = getattr(view, 'adapter_class', None)
-
-        if not self.adapter_class:
+        adapter_class = getattr(view, 'adapter_class', None)
+        if not adapter_class:
             raise serializers.ValidationError('Define adapter_class in view')
 
-        self.adapter = self.adapter_class()
-        app = self.adapter.get_provider().get_app(request)
-        token = self.adapter.parse_token({'access_token': access_token})
+        adapter = adapter_class()
+        app = adapter.get_provider().get_app(request)
+        token = adapter.parse_token({'access_token': access_token})
         token.app = app
 
         try:
-            login = self.adapter.complete_login(request, app, token,
-                                                response=access_token)
-
-            login.token = token
+            login = self.get_social_account(adapter, app, token, access_token)
             complete_social_login(request, login)
         except HTTPError:
             raise serializers.ValidationError('Incorrect value')