Add set_callback_url function (#239)

* Add set_callback_url function

* Add exception handler for set_callback_url

dj_rest_auth/registration/serializers.py

@@ -1,8 +1,10 @@
 from django.contrib.auth import get_user_model
 from django.http import HttpRequest
+from django.urls.exceptions import NoReverseMatch
 from django.utils.translation import gettext_lazy as _
 from requests.exceptions import HTTPError
 from rest_framework import serializers
+from rest_framework.reverse import reverse
 
 try:
     from allauth.account import app_settings as allauth_settings
@@ -20,6 +22,7 @@ class SocialAccountSerializer(serializers.ModelSerializer):
     """
     serialize allauth SocialAccounts for use with a REST API
     """
+
     class Meta:
         model = SocialAccount
         fields = (
@@ -57,6 +60,21 @@ def get_social_login(self, adapter, app, token, response):
         social_login.token = token
         return social_login
 
+    def set_callback_url(self, view, adapter_class):
+        # first set url from view
+        self.callback_url = getattr(view, 'callback_url', None)
+        if not self.callback_url:
+            # auto generate base on adapter and request
+            try:
+                self.callback_url = reverse(
+                    viewname=adapter_class.provider_id + '_callback',
+                    request=self._get_request()
+                )
+            except NoReverseMatch:
+                raise serializers.ValidationError(
+                    _("Define callback_url in view")
+                )
+
     def validate(self, attrs):
         view = self.context.get('view')
         request = self._get_request()
@@ -89,13 +107,9 @@ def validate(self, attrs):
 
         # Case 2: We received the authorization code
         elif code:
-            self.callback_url = getattr(view, 'callback_url', None)
+            self.set_callback_url(view=view, adapter_class=adapter_class)
             self.client_class = getattr(view, 'client_class', None)
 
-            if not self.callback_url:
-                raise serializers.ValidationError(
-                    _("Define callback_url in view")
-                )
             if not self.client_class:
                 raise serializers.ValidationError(
                     _("Define client_class in view")