feat: add authorship arguments to SayStream and AsyncSayStream

Add icon_emoji, icon_url, and username parameters to say_stream()
call, matching the new authorship support in slack_sdk v3.42.0.

Co-Authored-By: Claude <svc-devxp-claude@slack-corp.com>

Author: zimeg

slack_bolt/context/say_stream/async_say_stream.py

@@ -34,6 +34,9 @@ async def __call__(
         recipient_team_id: Optional[str] = None,
         recipient_user_id: Optional[str] = None,
         thread_ts: Optional[str] = None,
+        icon_emoji: Optional[str] = None,
+        icon_url: Optional[str] = None,
+        username: Optional[str] = None,
         **kwargs,
     ) -> AsyncChatStream:
         """Starts a new chat stream with context."""
@@ -51,12 +54,18 @@ async def __call__(
                 recipient_team_id=recipient_team_id or self.recipient_team_id,
                 recipient_user_id=recipient_user_id or self.recipient_user_id,
                 thread_ts=thread_ts,
+                icon_emoji=icon_emoji,
+                icon_url=icon_url,
+                username=username,
                 **kwargs,
             )
         return await self.client.chat_stream(
             channel=channel,
             recipient_team_id=recipient_team_id or self.recipient_team_id,
             recipient_user_id=recipient_user_id or self.recipient_user_id,
             thread_ts=thread_ts,
+            icon_emoji=icon_emoji,
+            icon_url=icon_url,
+            username=username,
             **kwargs,
         )

slack_bolt/context/say_stream/say_stream.py

@@ -34,6 +34,9 @@ def __call__(
         recipient_team_id: Optional[str] = None,
         recipient_user_id: Optional[str] = None,
         thread_ts: Optional[str] = None,
+        icon_emoji: Optional[str] = None,
+        icon_url: Optional[str] = None,
+        username: Optional[str] = None,
         **kwargs,
     ) -> ChatStream:
         """Starts a new chat stream with context."""
@@ -51,12 +54,18 @@ def __call__(
                 recipient_team_id=recipient_team_id or self.recipient_team_id,
                 recipient_user_id=recipient_user_id or self.recipient_user_id,
                 thread_ts=thread_ts,
+                icon_emoji=icon_emoji,
+                icon_url=icon_url,
+                username=username,
                 **kwargs,
             )
         return self.client.chat_stream(
             channel=channel,
             recipient_team_id=recipient_team_id or self.recipient_team_id,
             recipient_user_id=recipient_user_id or self.recipient_user_id,
             thread_ts=thread_ts,
+            icon_emoji=icon_emoji,
+            icon_url=icon_url,
+            username=username,
             **kwargs,
         )

tests/slack_bolt/context/test_say_stream.py

@@ -98,3 +98,24 @@ def test_buffer_size_overrides(self):
             "icon_url": None,
             "username": None,
         }
+
+    def test_authorship_overrides(self):
+        say_stream = SayStream(
+            client=self.web_client,
+            channel="C111",
+            recipient_team_id="T111",
+            recipient_user_id="U111",
+            thread_ts="111.222",
+        )
+        stream = say_stream(icon_emoji=":maple_leaf:", username="Charlie Brown")
+
+        assert stream._stream_args == {
+            "channel": "C111",
+            "thread_ts": "111.222",
+            "recipient_team_id": "T111",
+            "recipient_user_id": "U111",
+            "task_display_mode": None,
+            "icon_emoji": ":maple_leaf:",
+            "icon_url": None,
+            "username": "Charlie Brown",
+        }

tests/slack_bolt_async/context/test_async_say_stream.py

@@ -111,3 +111,25 @@ async def test_buffer_size_overrides(self):
             "icon_url": None,
             "username": None,
         }
+
+    @pytest.mark.asyncio
+    async def test_authorship_overrides(self):
+        say_stream = AsyncSayStream(
+            client=self.web_client,
+            channel="C111",
+            recipient_team_id="T111",
+            recipient_user_id="U111",
+            thread_ts="111.222",
+        )
+        stream = await say_stream(icon_emoji=":maple_leaf:", username="Charlie Brown")
+
+        assert stream._stream_args == {
+            "channel": "C111",
+            "thread_ts": "111.222",
+            "recipient_team_id": "T111",
+            "recipient_user_id": "U111",
+            "task_display_mode": None,
+            "icon_emoji": ":maple_leaf:",
+            "icon_url": None,
+            "username": "Charlie Brown",
+        }