fix(gateway): include replied-to media attachments (#46107)

tests/e2e/test_discord_adapter.py

@@ -5,6 +5,7 @@ Covers the fix for slash commands not being recognized when sent via
 """
 
 import asyncio
+from types import SimpleNamespace
 from unittest.mock import AsyncMock
 
 import pytest
@@ -104,3 +105,51 @@ class TestAutoThreadingPreservesCommand:
         response = get_response_text(discord_adapter)
         assert response is not None
         assert "/new" in response
+
+
+class TestRepliedToMediaDispatch:
+    async def test_reply_to_image_message_caches_referenced_attachment(
+        self, discord_adapter, bot_user, monkeypatch
+    ):
+        """A text reply to an image-bearing Discord message should give the agent that image."""
+        cached_path = "/tmp/replied-discord-image.png"
+
+        async def fake_cache_image_from_url(url, *, ext=".jpg"):
+            assert url == "https://cdn.discordapp.com/attachments/image.png"
+            assert ext == ".png"
+            return cached_path
+
+        monkeypatch.setattr(
+            "plugins.platforms.discord.adapter.cache_image_from_url",
+            fake_cache_image_from_url,
+        )
+        discord_adapter.handle_message = AsyncMock()
+
+        attachment = SimpleNamespace(
+            content_type="image/png",
+            filename="image.png",
+            url="https://cdn.discordapp.com/attachments/image.png",
+            size=1234,
+        )
+        referenced_message = SimpleNamespace(
+            id=12345,
+            content="",
+            attachments=[attachment],
+        )
+        msg = make_discord_message(
+            content=f"<@{BOT_USER_ID}> what's in this image?",
+            mentions=[bot_user],
+        )
+        msg.type = 19
+        msg.reference = SimpleNamespace(message_id=12345, resolved=referenced_message)
+
+        await discord_adapter._handle_message(msg)
+
+        discord_adapter.handle_message.assert_awaited_once()
+        await_args = discord_adapter.handle_message.await_args
+        assert await_args is not None
+        event = await_args.args[0]
+        assert event.reply_to_message_id == "12345"
+        assert event.media_urls == [cached_path]
+        assert event.media_types == ["image/png"]
+        assert event.message_type.value == "photo"

tests/gateway/test_telegram_group_gating.py

@@ -1007,6 +1007,53 @@ def test_triggered_voice_message_uses_shared_session_in_observe_mode():
     asyncio.run(_run())
 
 
+# ---------------------------------------------------------------------------
+# Replied-to media caching
+# ---------------------------------------------------------------------------
+
+def test_text_reply_to_photo_caches_referenced_media(monkeypatch, tmp_path):
+    async def _run():
+        adapter = _make_adapter(require_mention=False)
+        adapter.handle_message = AsyncMock()
+        cached_path = tmp_path / "reply_photo.png"
+        monkeypatch.setattr(
+            "gateway.platforms.base.cache_image_from_bytes",
+            lambda _data, ext=".jpg": str(cached_path),
+        )
+        file_obj = SimpleNamespace(
+            file_path="photos/replied.png",
+            download_as_bytearray=AsyncMock(return_value=bytearray(b"\x89PNG\r\n\x1a\n reply")),
+        )
+        photo = SimpleNamespace(file_size=1234, get_file=AsyncMock(return_value=file_obj))
+        replied = SimpleNamespace(
+            message_id=51,
+            text=None,
+            caption=None,
+            photo=[photo],
+            video=None,
+            audio=None,
+            voice=None,
+            document=None,
+        )
+        msg = _group_message("what's in this image?", reply_to_bot=False)
+        msg.reply_to_message = replied
+        update = SimpleNamespace(update_id=3010, message=msg, effective_message=msg)
+
+        await adapter._handle_text_message(update, SimpleNamespace())
+        await asyncio.sleep(0.05)
+
+        adapter.handle_message.assert_awaited_once()
+        await_args = adapter.handle_message.await_args
+        assert await_args is not None
+        event = await_args.args[0]
+        assert event.reply_to_message_id == "51"
+        assert event.media_urls == [str(cached_path)]
+        assert event.media_types == ["image/png"]
+        assert event.message_type == MessageType.PHOTO
+
+    asyncio.run(_run())
+
+
 # ---------------------------------------------------------------------------
 # Observed-media caching (unmentioned group attachments)
 # ---------------------------------------------------------------------------