Get display name from profile

Related to #872

emails/models.py

@@ -100,6 +100,12 @@ def at_max_free_aliases(self):
     def fxa(self):
         return self.user.socialaccount_set.filter(provider='fxa').first()
 
+    @property
+    def display_name(self):
+        # if display name is not set on FxA the
+        # displayName key will not exist on the extra_data
+        return self.fxa.extra_data.get('displayName')
+
     @property
     def has_unlimited(self):
         # FIXME: as we don't have all the tiers defined we are over-defining

emails/tests/models_tests.py

@@ -381,6 +381,26 @@ def test_add_subdomain_to_unlimited_profile_with_badword_subdomain_raises_except
             return
         self.fail("Should have raised CannotMakeSubdomainException")
 
+    def test_display_name_exists(self):
+        display_name = 'Display Name'
+        social_account = baker.make(
+            SocialAccount,
+            provider='fxa',
+            extra_data={'displayName': display_name}
+        )
+        profile = Profile.objects.get(user=social_account.user)
+        assert profile.display_name == display_name
+
+    def test_display_name_does_not_exist(self):
+        social_account = baker.make(
+            SocialAccount,
+            provider='fxa',
+            extra_data={}
+        )
+        profile = Profile.objects.get(user=social_account.user)
+        assert profile.display_name == None
+
+
 
 class DomainAddressTest(TestCase):
     def setUp(self):