Merge pull request #3247 from python-discord/swfarnsworth/fix-auto-up…

…load

Swfarnsworth/fix auto upload

bot/exts/filtering/filtering.py

@@ -66,6 +66,15 @@
 WEEKLY_REPORT_ISO_DAY = 3  # 1=Monday, 7=Sunday
 
 
+async def _extract_text_file_content(att: discord.Attachment) -> str:
+    """Extract up to the first 30 lines or first 2000 characters (whichever is shorter) of an attachment."""
+    file_encoding = re.search(r"charset=(\S+)", att.content_type).group(1)
+    file_content_bytes = await att.read()
+    file_lines = file_content_bytes.decode(file_encoding).splitlines()
+    first_n_lines = "\n".join(file_lines[:30])[:2_000]
+    return f"{att.filename}: {first_n_lines}"
+
+
 class Filtering(Cog):
     """Filtering and alerting for content posted on the server."""
 
@@ -80,7 +89,7 @@ class Filtering(Cog):
     def __init__(self, bot: Bot):
         self.bot = bot
         self.filter_lists: dict[str, FilterList] = {}
-        self._subscriptions: defaultdict[Event, list[FilterList]] = defaultdict(list)
+        self._subscriptions = defaultdict[Event, list[FilterList]](list)
         self.delete_scheduler = scheduling.Scheduler(self.__class__.__name__)
         self.webhook: discord.Webhook | None = None
 
@@ -223,6 +232,16 @@ async def on_message(self, msg: Message) -> None:
         self.message_cache.append(msg)
 
         ctx = FilterContext.from_message(Event.MESSAGE, msg, None, self.message_cache)
+
+        text_contents = [
+            await _extract_text_file_content(a)
+            for a in msg.attachments if "charset" in a.content_type
+        ]
+
+        if text_contents:
+            attachment_content = "\n\n".join(text_contents)
+            ctx = ctx.replace(content=f"{ctx.content}\n\n{attachment_content}")
+
         result_actions, list_messages, triggers = await self._resolve_action(ctx)
         self.message_cache.update(msg, metadata=triggers)
         if result_actions:

bot/exts/utils/attachment_pastebin_uploader.py

@@ -0,0 +1,156 @@
+from __future__ import annotations
+
+import re
+
+import aiohttp
+import discord
+from discord.ext import commands
+from pydis_core.utils import paste_service
+
+from bot.bot import Bot
+from bot.constants import Emojis
+from bot.log import get_logger
+
+log = get_logger(__name__)
+
+UPLOAD_EMOJI = Emojis.check_mark
+DELETE_EMOJI = Emojis.trashcan
+
+
+class AutoTextAttachmentUploader(commands.Cog):
+    """
+    Handles automatic uploading of attachments to the paste bin.
+
+    Whenever a user uploads one or more attachments that is text-based (py, txt, csv, etc.), this cog offers to upload
+    all the attachments to the paste bin automatically. The steps are as follows:
+    - The bot replies to the message containing the attachments, asking the user to react with a checkmark to consent
+      to having the content uploaded.
+    - If consent is given, the bot uploads the contents and edits its own message to contain the link.
+    - The bot DMs the user the delete link for the paste.
+    - The bot waits for the user to react with a trashcan emoji, in which case the bot deletes the paste and its own
+      message.
+    """
+
+    def __init__(self, bot: Bot):
+        self.bot = bot
+        self.pending_messages = set[int]()
+
+    @staticmethod
+    async def _convert_attachment(attachment: discord.Attachment) -> paste_service.PasteFile:
+        """Converts an attachment to a PasteFile, according to the attachment's file encoding."""
+        encoding = re.search(r"charset=(\S+)", attachment.content_type).group(1)
+        file_content_bytes = await attachment.read()
+        file_content = file_content_bytes.decode(encoding)
+        return paste_service.PasteFile(content=file_content, name=attachment.filename)
+
+    async def wait_for_user_reaction(
+        self,
+        message: discord.Message,
+        user: discord.User,
+        emoji: str,
+        timeout: float = 60,
+    ) -> bool:
+        """Wait for `timeout` seconds for `user` to react to `message` with `emoji`."""
+        def wait_for_reaction(reaction: discord.Reaction, reactor: discord.User) -> bool:
+            return (
+                reaction.message.id == message.id
+                and str(reaction.emoji) == emoji
+                and reactor == user
+            )
+
+        await message.add_reaction(emoji)
+        log.trace(f"Waiting for {user.name} to react to {message.id} with {emoji}")
+
+        try:
+            await self.bot.wait_for("reaction_add", timeout=timeout, check=wait_for_reaction)
+        except TimeoutError:
+            log.trace(f"User {user.name} did not react to message {message.id} with {emoji}")
+            await message.clear_reactions()
+            return False
+
+        return True
+
+    @commands.Cog.listener()
+    async def on_message_delete(self, message: discord.Message) -> None:
+        """Allows us to know which messages with attachments have been deleted."""
+        self.pending_messages.discard(message.id)
+
+    @commands.Cog.listener()
+    async def on_message(self, message: discord.Message) -> None:
+        """Listens for messages containing attachments and offers to upload them to the pastebin."""
+        # Check if the message contains an embedded file and is not sent by a bot.
+        if message.author.bot or not any("charset" in a.content_type for a in message.attachments):
+            return
+
+        log.trace(f"Offering to upload attachments for {message.author} in {message.channel}, message {message.id}")
+        self.pending_messages.add(message.id)
+
+        # Offer to upload the attachments and wait for the user's reaction.
+        bot_reply = await message.reply(
+            f"Please react with {UPLOAD_EMOJI} to upload your file(s) to our "
+            f"[paste bin](<https://paste.pythondiscord.com/>), which is more accessible for some users."
+        )
+
+        permission_granted = await self.wait_for_user_reaction(bot_reply, message.author, UPLOAD_EMOJI, 60. * 3)
+
+        if not permission_granted:
+            log.trace(f"{message.author} didn't give permission to upload {message.id} content; aborting.")
+            await bot_reply.edit(content=f"~~{bot_reply.content}~~")
+            return
+
+        if message.id not in self.pending_messages:
+            log.trace(f"{message.author}'s message was deleted before the attachments could be uploaded; aborting.")
+            await bot_reply.delete()
+            return
+
+        # In either case, we do not want the message ID in pending_messages anymore.
+        self.pending_messages.discard(message.id)
+
+        # Extract the attachments.
+        files = [
+            await self._convert_attachment(f)
+            for f in message.attachments
+            if "charset" in f.content_type
+        ]
+
+        # Upload the files to the paste bin, exiting early if there's an error.
+        log.trace(f"Attempting to upload {len(files)} file(s) to pastebin.")
+        try:
+            async with aiohttp.ClientSession() as session:
+                paste_response = await paste_service.send_to_paste_service(files=files, http_session=session)
+        except (paste_service.PasteTooLongError, ValueError):
+            log.trace(f"{message.author}'s attachments were too long.")
+            await bot_reply.edit(content="Your paste is too long, and couldn't be uploaded.")
+            return
+        except paste_service.PasteUploadError:
+            log.trace(f"Unexpected error uploading {message.author}'s attachments.")
+            await bot_reply.edit(content="There was an error uploading your paste.")
+            return
+
+        # Send the user a DM with the delete link for the paste.
+        # The angle brackets around the remove link are required to stop Discord from visiting the URL to produce a
+        # preview, thereby deleting the paste
+        await message.author.send(content=f"[Click here](<{paste_response.removal}>) to delete your recent paste.")
+
+        # Edit the bot message to contain the link to the paste.
+        await bot_reply.edit(content=f"[Click here]({paste_response.link}) to see this code in our pastebin.")
+        await bot_reply.clear_reactions()
+        await bot_reply.add_reaction(DELETE_EMOJI)
+
+        # Wait for the user to react with a trash can, which they can use to delete the paste.
+        log.trace(f"Offering to delete {message.author}'s attachments in {message.channel}, message {message.id}")
+        user_wants_delete = await self.wait_for_user_reaction(bot_reply, message.author, DELETE_EMOJI, 60. * 10)
+
+        if not user_wants_delete:
+            return
+
+        # Delete the paste and the bot's message.
+        async with aiohttp.ClientSession() as session:
+            await session.get(paste_response.removal)
+
+        await bot_reply.delete()
+
+
+async def setup(bot: Bot) -> None:
+    """Load the EmbedFileHandler cog."""
+    await bot.add_cog(AutoTextAttachmentUploader(bot))

tests/bot/exts/filtering/test_extension_filter.py

@@ -68,40 +68,6 @@ async def test_message_with_illegal_extension(self):
 
         self.assertEqual(result, ({}, ["`.disallowed`"], {ListType.ALLOW: []}))
 
-    @patch("bot.instance", BOT)
-    async def test_python_file_redirect_embed_description(self):
-        """A message containing a .py file should result in an embed redirecting the user to our paste site."""
-        attachment = MockAttachment(filename="python.py")
-        ctx = self.ctx.replace(attachments=[attachment])
-
-        await self.filter_list.actions_for(ctx)
-
-        self.assertEqual(ctx.dm_embed, extension.PY_EMBED_DESCRIPTION)
-
-    @patch("bot.instance", BOT)
-    async def test_txt_file_redirect_embed_description(self):
-        """A message containing a .txt/.json/.csv file should result in the correct embed."""
-        test_values = (
-            ("text", ".txt"),
-            ("json", ".json"),
-            ("csv", ".csv"),
-        )
-
-        for file_name, disallowed_extension in test_values:
-            with self.subTest(file_name=file_name, disallowed_extension=disallowed_extension):
-
-                attachment = MockAttachment(filename=f"{file_name}{disallowed_extension}")
-                ctx = self.ctx.replace(attachments=[attachment])
-
-                await self.filter_list.actions_for(ctx)
-
-                self.assertEqual(
-                    ctx.dm_embed,
-                    extension.TXT_EMBED_DESCRIPTION.format(
-                        blocked_extension=disallowed_extension,
-                    )
-                )
-
     @patch("bot.instance", BOT)
     async def test_other_disallowed_extension_embed_description(self):
         """Test the description for a non .py/.txt/.json/.csv disallowed extension."""