Handle adding reactions to messages from users who have blocked the bot (#2580)

Co-authored-by: Xithrius <15021300+Xithrius@users.noreply.github.com>
Co-authored-by: Xithrius <xithrius@gmail.com>

Author: TizzySaurus

bot/bot.py

@@ -1,7 +1,11 @@
 import asyncio
+import contextlib
+from sys import exception
 
 import aiohttp
+from discord.errors import Forbidden
 from pydis_core import BotBase
+from pydis_core.utils.error_handling import handle_forbidden_from_block
 from sentry_sdk import push_scope
 
 from bot import constants, exts
@@ -48,6 +52,18 @@ async def setup_hook(self) -> None:
 
     async def on_error(self, event: str, *args, **kwargs) -> None:
         """Log errors raised in event listeners rather than printing them to stderr."""
+        e_val = exception()
+
+        if isinstance(e_val, Forbidden):
+            message = args[0] if event == "on_message" else args[1] if event == "on_message_edit" else None
+
+            with contextlib.suppress(Forbidden):
+                # Attempt to handle the error. This reraises the error if's not due to a block,
+                # in which case the error is suppressed and handled normally. Otherwise, it was
+                # handled so return.
+                await handle_forbidden_from_block(e_val, message)
+                return
+
         self.stats.incr(f"errors.event.{event}")
 
         with push_scope() as scope:

bot/exts/backend/error_handler.py

@@ -1,9 +1,10 @@
 import copy
 import difflib
 
-from discord import Embed, Member
+from discord import Embed, Forbidden, Member
 from discord.ext.commands import ChannelNotFound, Cog, Context, TextChannelConverter, VoiceChannelConverter, errors
 from pydis_core.site_api import ResponseCodeError
+from pydis_core.utils.error_handling import handle_forbidden_from_block
 from sentry_sdk import push_scope
 
 from bot.bot import Bot
@@ -98,6 +99,11 @@ async def on_command_error(self, ctx: Context, e: errors.CommandError) -> None:
                 await ctx.send(f"{e.original} Please wait for it to finish and try again later.")
             elif isinstance(e.original, InvalidInfractedUserError):
                 await ctx.send(f"Cannot infract that user. {e.original.reason}")
+            elif isinstance(e.original, Forbidden):
+                try:
+                    await handle_forbidden_from_block(e.original, ctx.message)
+                except Forbidden:
+                    await self.handle_unexpected_error(ctx, e.original)
             else:
                 await self.handle_unexpected_error(ctx, e.original)
         elif isinstance(e, errors.ConversionError):