Targetted cleanup bot.

cleanup.py

#!/usr/bin/env python3
"""
This is free and unencumbered software released into the public domain.
Anyone is free to copy, modify, publish, use, compile, sell, or
distribute this software, either in source code form or as a compiled
binary, for any purpose, commercial or non-commercial, and by any
means.
In jurisdictions that recognize copyright laws, the author or authors
of this software dedicate any and all copyright interest in the
software to the public domain. We make this dedication for the benefit
of the public at large and to the detriment of our heirs and
successors. We intend this dedication to be an overt act of
relinquishment in perpetuity of all present and future rights to this
software under copyright law.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.
For more information, please refer to <http://unlicense.org/>
"""
import asyncio
import logging
import os
import re

try:
    import discord
    from discord.ext import commands
except ImportError:
    raise RuntimeError("You need the rewrite of discord.py for this script")

log = logging.getLogger()
log.setLevel(logging.INFO)

bot = commands.AutoShardedBot(
    command_prefix=commands.when_mentioned,
    description="Censorship is dumb. Rewriting & erasing history is dumber. Here we are.",
)


async def channel_cleaner(
    ctx: commands.Context, channel: discord.TextChannel, pattern: re.Pattern
):

    count = 0
    async for message in channel.history(limit=None):
        if message.content and pattern.match(message.content):
            try:
                _id = message.id
                url = message.jump_url
                await message.delete()
            except discord.HTTPException:
                log.info(f"Could not delete message {url}")
            else:
                count += 1
                log.info(f"Deleted message {_id}")

    await ctx.send(f"No more books to burn in {channel.mention} (burned {count})")


@commands.bot_has_permissions(manage_messages=True)
@commands.guild_only()
@commands.is_owner()
@bot.command()
async def retroactivecensor(ctx: commands.Context, *, phrase: str):
    """
    Will delete tons of messages. Case insensitive.
    """

    pattern = re.compile(re.escape(phrase), re.I)
    tasks = [
        channel_cleaner(ctx, c, pattern)
        for c in ctx.guild.text_channels
        if c.permissions_for(ctx.guild.me).manage_messages
    ]

    await asyncio.gather(*tasks)
    await ctx.send("I'm done burning books.")


@commands.bot_has_permissions(manage_messages=True)
@commands.guild_only()
@commands.is_owner()
@bot.command()
async def retroactiveregexcensor(ctx: commands.Context, *, pattern: str):
    """
    Takes a regex pattern. Filters all the messages which match it.
    Not ReDoS safe, make your regex carefully to avoid pathalogical expansions.
    """

    pattern = re.compile(pattern)
    tasks = [
        channel_cleaner(ctx, c, pattern)
        for c in ctx.guild.text_channels
        if c.permissions_for(ctx.guild.me).manage_messages
    ]

    await asyncio.gather(*tasks)
    await ctx.send("I'm done burning books.")


if __name__ == "__main__":
    if not discord.__version__.startswith("1.0."):
        print("You need the rewrite version of discord.py for this script.")
        sys.exit(1)
    try:
        TOKEN = os.environ.get("CENSORSHIPTOKEN")
    except:
        print(
            "You need to run this with your token "
            'stored in an environment var named "CENSORSHIPTOKEN"'
        )
        sys.exit(1)
    print(
        "I hate that this is a neccessary tool, but here we are. Use with caution and discretion."
    )
    bot.run(TOKEN)