scheduled-messages: Update scheduled message objects in the API for type.

Updates the objects in the API for scheduled messages so that those
for stream messages return the `to` property as an integer since it
is always the unique stream ID and so that those for direct messages
do not have a `topic` property since direct messages never have a
topic.

Also makes small update so that web app scheduled messages overlay
has the correct stream ID.

web/src/scheduled_messages_overlay_ui.js

@@ -26,7 +26,7 @@ function format(scheduled_messages) {
         const msg_render_context = {...msg};
         if (msg.type === "stream") {
             msg_render_context.is_stream = true;
-            msg_render_context.stream_id = msg.to[0];
+            msg_render_context.stream_id = msg.to;
             msg_render_context.stream_name = stream_data.maybe_get_stream_name(
                 msg_render_context.stream_id,
             );

zerver/lib/scheduled_messages.py

@@ -1,9 +1,14 @@
-from typing import List
+from typing import List, Union
 
 from django.utils.translation import gettext as _
 
 from zerver.lib.exceptions import ResourceNotFoundError
-from zerver.models import ScheduledMessage, ScheduledMessageDict, UserProfile
+from zerver.models import (
+    DirectScheduledMessageAPI,
+    ScheduledMessage,
+    StreamScheduledMessageAPI,
+    UserProfile,
+)
 
 
 def access_scheduled_message(
@@ -15,11 +20,13 @@ def access_scheduled_message(
         raise ResourceNotFoundError(_("Scheduled message does not exist"))
 
 
-def get_undelivered_scheduled_messages(user_profile: UserProfile) -> List[ScheduledMessageDict]:
+def get_undelivered_scheduled_messages(
+    user_profile: UserProfile,
+) -> List[Union[DirectScheduledMessageAPI, StreamScheduledMessageAPI]]:
     scheduled_messages = ScheduledMessage.objects.filter(
         sender=user_profile, delivered=False, delivery_type=ScheduledMessage.SEND_LATER
     ).order_by("scheduled_timestamp")
-    scheduled_message_dicts: List[ScheduledMessageDict] = [
+    scheduled_message_dicts: List[Union[DirectScheduledMessageAPI, StreamScheduledMessageAPI]] = [
         scheduled_message.to_dict() for scheduled_message in scheduled_messages
     ]
     return scheduled_message_dicts

zerver/models.py

@@ -4281,13 +4281,22 @@ class ScheduledMessageNotificationEmail(models.Model):
     scheduled_timestamp = models.DateTimeField(db_index=True)
 
 
-class ScheduledMessageDict(TypedDict):
+class StreamScheduledMessageAPI(TypedDict):
+    scheduled_message_id: int
+    to: int
+    type: str
+    content: str
+    rendered_content: str
+    topic: str
+    deliver_at: int
+
+
+class DirectScheduledMessageAPI(TypedDict):
     scheduled_message_id: int
     to: List[int]
     type: str
     content: str
     rendered_content: str
-    topic: str
     deliver_at: int
 
 
@@ -4326,15 +4335,31 @@ class ScheduledMessage(models.Model):
     def set_topic_name(self, topic_name: str) -> None:
         self.subject = topic_name
 
-    def to_dict(self) -> ScheduledMessageDict:
+    def to_dict(self) -> Union[StreamScheduledMessageAPI, DirectScheduledMessageAPI]:
         recipient, recipient_type_str = get_recipient_ids(self.recipient, self.sender.id)
 
-        return ScheduledMessageDict(
+        if recipient_type_str == "private":
+            # The topic for direct messages should always be an empty string.
+            assert self.topic_name() == ""
+
+            return DirectScheduledMessageAPI(
                 scheduled_message_id=self.id,
                 to=recipient,
                 type=recipient_type_str,
                 content=self.content,
                 rendered_content=self.rendered_content,
+                deliver_at=int(self.scheduled_timestamp.timestamp() * 1000),
+            )
+
+        # The recipient for stream messages should always just be the unique stream ID.
+        assert len(recipient) == 1
+
+        return StreamScheduledMessageAPI(
+            scheduled_message_id=self.id,
+            to=recipient[0],
+            type=recipient_type_str,
+            content=self.content,
+            rendered_content=self.rendered_content,
             topic=self.topic_name(),
             deliver_at=int(self.scheduled_timestamp.timestamp() * 1000),
         )

zerver/openapi/zulip.yaml

@@ -17358,21 +17358,23 @@ components:
             - stream
             - private
         to:
-          type: array
-          description: |
-            An array of the tentative target audience IDs. For "stream"
-            messages, this should contain exactly 1 ID, the ID of the
-            target stream. For private messages, this should be an array
-            of target user IDs. This cannot be an empty array since
-            scheduled messages are always addressed.
+          oneOf:
+            - type: integer
+            - type: array
               items:
                 type: integer
+          description: |
+            The scheduled message's tentative target audience.
+
+            For stream messages, it will be the unique ID of the target
+            stream. For private messages, it will be an array with the
+            target users' IDs.
         topic:
           type: string
           description: |
-            For stream scheduled message, the tentative topic name. For private messages,
-            this will be ignored and should ideally
-            be the empty string. Should not contain null bytes.
+            Only present if `type` is `"stream"`.
+
+            The topic for the stream message.
         content:
           type: string
           description: |
@@ -17392,7 +17394,6 @@ components:
         - scheduled_message_id
         - type
         - to
-        - topic
         - content
         - rendered_content
         - deliver_at

zerver/tests/test_scheduled_messages.py

@@ -221,7 +221,7 @@ class ScheduledMessageTest(ZulipTestCase):
             scheduled_messages[0]["scheduled_message_id"], self.last_scheduled_message().id
         )
         self.assertEqual(scheduled_messages[0]["content"], content)
-        self.assertEqual(scheduled_messages[0]["to"], [self.get_stream_id("Verona")])
+        self.assertEqual(scheduled_messages[0]["to"], self.get_stream_id("Verona"))
         self.assertEqual(scheduled_messages[0]["type"], "stream")
         self.assertEqual(scheduled_messages[0]["topic"], "Test topic")
         self.assertEqual(