Add handling for HTTP 502 response from Matrix server

hc/front/forms.py

@@ -272,6 +272,11 @@ class AddMatrixForm(forms.Form):
                 "Matrix server returned status code 429 (Too Many Requests), "
                 "please try again later."
             )
+        if r.status_code == 502:
+            raise forms.ValidationError(
+                "Matrix server returned status code 502 (Bad Gateway), "
+                "please try again later."
+            )
 
         doc = r.json()
         if "error" in doc:

hc/front/tests/test_add_matrix.py

@@ -20,6 +20,7 @@ class AddMatrixTestCase(BaseTestCase):
 
     @patch("hc.front.forms.requests.post")
     def test_it_works(self, mock_post):
+        mock_post.return_value.status_code = 200
         mock_post.return_value.json.return_value = {"room_id": "fake-room-id"}
 
         form = {"alias": "!foo:example.org"}
@@ -49,6 +50,17 @@ class AddMatrixTestCase(BaseTestCase):
         self.assertContains(r, "Matrix server returned status code 429")
         self.assertFalse(Channel.objects.exists())
 
+    @patch("hc.front.forms.requests.post")
+    def test_it_handles_502(self, mock_post):
+        mock_post.return_value.status_code = 502
+
+        form = {"alias": "!foo:example.org"}
+        self.client.login(username="[email protected]", password="password")
+        r = self.client.post(self.url, form)
+
+        self.assertContains(r, "Matrix server returned status code 502")
+        self.assertFalse(Channel.objects.exists())
+
     def test_it_requires_rw_access(self):
         self.bobs_membership.role = "r"
         self.bobs_membership.save()