Prevents flashbangs (very bright images) to be uploaded to discord servers

AntiFlashbang-bot.py

import aiohttp
import discord

from datetime import datetime
from io import BytesIO
from PIL import Image
from PIL import ImageStat

TOKEN = "YOUR DISCORD TOKEN HERE"
THRESHOLD = 192 # brightness threshold... How close it is to being fully white
IMAGE_SIZE = 500 # miminum image size

class AntiFlashbang(discord.Client):
	async def on_ready(self):
		print("Logged in as")
		print(self.user.name)
		print(self.user.id)
		print("Invitation Link: https://discordapp.com/oauth2/authorize?client_id={}&scope=bot&permissions=8192".format(self.user.id))
		print("------")
		await client.change_presence(activity=discord.Activity(type=discord.ActivityType.listening, name="flashbangs"))

	async def on_message(self, message):
		if message.author.id == self.user.id or message.author.bot or message.guild is None:
			return

		if len(message.attachments) > 0:
			url = message.attachments[-1].url
			async with aiohttp.ClientSession() as cs:
				async with cs.get(url, headers={
					"User-agent": "Anti-Flashbang v1.0"
				}) as r:
					if r.status in range(200, 209):
						if r.headers["Content-Type"].split("/")[0] == "image":
							img = Image.open(BytesIO(await r.read())).convert("L")
							size = max(img.size[0], img.size[1])
							if size > IMAGE_SIZE:
								stat = ImageStat.Stat(img)
								if stat.mean[0] > THRESHOLD:
									print("[{}] NEUTRALIZED FLASHBANG FROM @{}#{} at {}#{}".format(datetime.now(), message.author.name, message.author.discriminator, message.guild.name, message.channel.name))
									await message.delete()
									await message.channel.send(":warning: | **No Flashbangs** {}".format(message.author.mention), delete_after=10.0)
					await cs.close()

client = AntiFlashbang()
client.run(TOKEN)

requirements.txt

discord.py
pillow