Monkey patch member and user converters to not convert from usernames

kurisu.py

@@ -27,6 +27,7 @@
 from utils.help import KuriHelp, HelpView, CategorySelect, MainHelpPaginator
 from utils.utils import create_error_embed
 from utils.context import KurisuContext
+from utils.patch import patched_member_convert, patched_user_convert
 
 cogs = (
     'cogs.assistance',
@@ -66,6 +67,10 @@
 DEBUG = False
 IS_DOCKER = os.environ.get('IS_DOCKER', '')
 
+# monkey patch member and user converters
+commands.MemberConverter.convert = patched_member_convert
+commands.UserConverter.convert = patched_user_convert
+
 if IS_DOCKER:
     def get_env(name: str):
         contents = os.environ.get(name)

utils/patch.py

@@ -0,0 +1,51 @@
+# Patched discord.py methods for monkey patching
+
+import discord
+import re
+
+from discord.ext import commands
+from discord.ext.commands import MemberNotFound, UserNotFound
+from discord.ext.commands._types import BotT
+from discord.ext.commands.converter import _get_from_guilds, _utils_get
+
+
+async def patched_member_convert(self, ctx: commands.Context[BotT], argument: str) -> discord.Member:
+    bot = ctx.bot
+    match = self._get_id_match(argument) or re.match(r'<@!?([0-9]{15,20})>$', argument)
+    guild = ctx.guild
+    if match is None:
+        raise MemberNotFound(argument)
+    else:
+        user_id = int(match.group(1))
+        if guild:
+            result = guild.get_member(user_id) or _utils_get(ctx.message.mentions, id=user_id)
+        else:
+            result = _get_from_guilds(bot, 'get_member', user_id)
+
+    if not isinstance(result, discord.Member):
+        if guild is None:
+            raise MemberNotFound(argument)
+
+        if user_id is not None:
+            result = await self.query_member_by_id(bot, guild, user_id)
+
+        if not result:
+            raise MemberNotFound(argument)
+
+    return result
+
+
+async def patched_user_convert(self, ctx: commands.Context[BotT], argument: str) -> discord.User:
+    match = self._get_id_match(argument) or re.match(r'<@!?([0-9]{15,20})>$', argument)
+
+    if match is not None:
+        user_id = int(match.group(1))
+        result = ctx.bot.get_user(user_id) or _utils_get(ctx.message.mentions, id=user_id)
+        if result is None:
+            try:
+                result = await ctx.bot.fetch_user(user_id)
+            except discord.HTTPException:
+                raise UserNotFound(argument) from None
+
+        return result  # type: ignore
+    raise UserNotFound(argument)