model/views: refactor: Get stream email address from new endpoint.

tests/model/test_model.py

@@ -554,6 +554,55 @@ def test_topics_in_stream(self, mocker, model, topics_index, fetched, stream_id=
         assert model.index["topics"][stream_id] == return_value
         assert model.index["topics"][stream_id] is not return_value
 
+    @pytest.mark.parametrize(
+        "response, return_value",
+        [
+            (
+                {"result": "success", "msg": "", "email": "username@example.com"},
+                "username@example.com",
+            ),
+            (
+                {"result": "error", "msg": "Invalid stream ID", "code": "BAD_REQUEST"},
+                "invalid",
+            ),
+        ],
+    )
+    def test__fetch_stream_email_address(
+        self, mocker, response, model, return_value, stream_id=1
+    ) -> None:
+        self.client.call_endpoint = mocker.Mock(return_value=response)
+
+        result = model._fetch_stream_email_address(stream_id)
+
+        self.client.call_endpoint.assert_called_once_with(
+            f"/streams/{stream_id}/email_address", method="GET"
+        )
+        assert result == return_value
+
+    @pytest.mark.parametrize(
+        "stream, fetched, response, return_value",
+        [
+            (
+                {"email_address": "username@example.com"},
+                False,
+                {},
+                "username@example.com",
+            ),
+            ({}, True, "username@example.com", "username@example.com"),
+            ({}, True, "invalid", ""),
+        ],
+    )
+    def test_stream_copy_text(
+        self, mocker, model, stream, fetched, response, return_value, stream_id=1
+    ):
+        model.stream_dict[stream_id] = stream
+        model._fetch_stream_email_address = mocker.Mock(return_value=response)
+
+        result = model.stream_copy_text(stream_id)
+
+        assert model._fetch_stream_email_address.called == fetched
+        assert result == return_value
+
     # pre server v3 provide user_id or id as a property within user key
     # post server v3 provide user_id as a property outside the user key
     @pytest.mark.parametrize("user_key", ["user_id", "id", None])

tests/ui_tools/test_popups.py

@@ -1398,9 +1398,11 @@ def test_stream_info_content__email_copy_text(
         general_stream: Dict[str, Any],
         stream_email_present: bool,
         expected_copy_text: str,
+        mocker: MockerFixture,
     ) -> None:
         if not stream_email_present:
             del general_stream["email_address"]
+            self.controller.model.stream_copy_text.return_value = ""
 
         model = self.controller.model
         stream_id = general_stream["stream_id"]

zulipterminal/model.py

@@ -891,6 +891,34 @@ def topics_in_stream(self, stream_id: int) -> List[str]:
 
         return list(self.index["topics"][stream_id])
 
+    def _fetch_stream_email_address(self, stream_id: int) -> str:
+        """
+        Fetch stream's email address with specified stream_id and
+        returns stream_email_address as a String.
+        Endpoint added in Zulip 7.5 (ZFL 226)
+        """
+        url = f"/streams/{stream_id}/email_address"
+
+        response = self.client.call_endpoint(url, method="GET")
+
+        if response.get("result") == "success":
+            email_address = response.get("email", "")
+            return str(email_address)
+        return "invalid"
+
+    def stream_copy_text(self, stream_id: int) -> str:
+        """
+        Attempts to retrieve stream email from stream_dict, fetching
+        from method if unavailable. (Retains handling across server versions).
+        """
+        stream = self.stream_dict[stream_id]
+        stream_email = stream.get("email_address", None)
+        if stream_email is None:
+            stream_email = self._fetch_stream_email_address(stream_id)
+        if stream_email == "invalid" or stream_email is None:
+            stream_email = ""
+        return stream_email
+
     @staticmethod
     def exception_safe_result(future: "Future[str]") -> str:
         try:

zulipterminal/ui_tools/views.py

@@ -1381,11 +1381,13 @@ def __init__(self, controller: Any, stream_id: int) -> None:
         )
         member_keys = ", ".join(map(repr, keys_for_command("STREAM_MEMBERS")))
 
-        # FIXME: This field was removed from the subscription data in Zulip 7.5 / ZFL226
-        #   We should use the new /streams/{stream_id}/email_address endpoint instead
-        self._stream_email = stream.get("email_address", None)
-        if self._stream_email is None:
+        # This field was removed from the subscription data in Zulip 7.5 / ZFL226
+        # Using the new /streams/{stream_id}/email_address endpoint
+        # if field isn't present in subscription data
+        self._stream_email = controller.model.stream_copy_text(stream_id)
+        if self._stream_email == "":
             stream_copy_text = "< Stream email is unavailable >"
+            self._stream_email = None
         else:
             email_keys = ", ".join(map(repr, keys_for_command("COPY_STREAM_EMAIL")))
             stream_copy_text = f"Press {email_keys} to copy Stream email address"