Make Discord id length variable and fix webhook hash (#16)
* prevent duplicate user for interactions * fix for older discord accounts * check channel mentions against full channel list * Fix compatibility for Python 3.7 Replace dict with Dict object from typing module * remove scary hashing * always expect guild_id * change hash to djb2 * Revert "always expect guild_id" This reverts commit dbcb3d1b9c97f6ceda0cf982b4bd7228926112c3. * guild_id warning, don't group bot created webhooks * fmt Co-authored-by: Friskygote <7283122+Friskygote@users.noreply.github.com> Co-authored-by: Wolf Gupta <e817509a-8ee9-4332-b0ad-3a6bdf9ab63f@aleeas.com>
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MarkusRost
GitHub
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commit
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4 changed files with 73 additions and 37 deletions
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@ -3,7 +3,6 @@ from dataclasses import dataclass
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from misc import dict_cls
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CDN_URL = "https://cdn.discordapp.com"
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ID_LEN = 18
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MESSAGE_LIMIT = 2000
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@ -107,6 +106,9 @@ class Message:
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self.channel_id = message["channel_id"]
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self.content = message.get("content", "")
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self.id = message["id"]
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self.guild_id = message.get(
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"guild_id", ""
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) # Responses for sending webhook messages don't have guild_id
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self.webhook_id = message.get("webhook_id", "")
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self.application_id = message.get("application_id", "")
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@ -2,7 +2,7 @@ import asyncio
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import json
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import logging
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import urllib.parse
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from typing import List
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from typing import Dict, List
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import urllib3
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import websockets
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@ -148,6 +148,18 @@ class Gateway:
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return dict_cls(resp, discord.Channel)
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def get_channels(self, guild_id: str) -> Dict[str, discord.Channel]:
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"""
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Get all channels for a given guild ID.
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"""
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resp = self.send("GET", f"/guilds/{guild_id}/channels")
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return {
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channel["id"]: dict_cls(channel, discord.Channel)
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for channel in resp
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}
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def get_emotes(self, guild_id: str) -> List[discord.Emote]:
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"""
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Get all the emotes for a given guild.
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@ -5,11 +5,11 @@ import os
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import re
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import sys
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import threading
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import urllib.parse
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from typing import Dict, List, Tuple
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import markdown
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import urllib3
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import urllib.parse
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import discord
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import matrix
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@ -28,7 +28,7 @@ class MatrixClient(AppService):
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self.db = DataBase(config["database"])
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self.discord = DiscordClient(self, config, http)
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self.format = "_discord_" # "{@,#}_discord_1234:localhost"
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self.id_regex = f"[0-9]{{{discord.ID_LEN}}}"
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self.id_regex = "[0-9]+" # Snowflakes may have variable length
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# TODO Find a cleaner way to use these keys.
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for k in ("m_emotes", "m_members", "m_messages"):
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@ -329,28 +329,40 @@ height=\"32\" src=\"{emote_}\" data-mx-emoticon />""",
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return message
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def mention_regex(self, encode: bool) -> str:
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def mention_regex(self, encode: bool, id_as_group: bool) -> str:
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mention = "@"
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colon = ":"
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snowflake = self.id_regex
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if encode:
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mention = urllib.parse.quote(mention)
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colon = urllib.parse.quote(colon)
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return f"{mention}{self.format}{self.id_regex}{colon}{re.escape(self.server_name)}"
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if id_as_group:
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snowflake = f"({snowflake})"
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hashed = f"(?:-{snowflake})?"
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return f"{mention}{self.format}{snowflake}{hashed}{colon}{re.escape(self.server_name)}"
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def process_message(self, event: matrix.Event) -> str:
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message = event.new_body if event.new_body else event.body
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emotes = re.findall(r":(\w*):", message)
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mentions = re.findall(
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self.mention_regex(encode=False), event.formatted_body
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mentions = list(
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re.finditer(
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self.mention_regex(encode=False, id_as_group=True),
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event.formatted_body,
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)
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)
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# For clients that properly encode mentions.
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# 'https://matrix.to/#/%40_discord_...%3Adomain.tld'
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mentions.extend(
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re.findall(self.mention_regex(encode=True), event.formatted_body)
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re.finditer(
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self.mention_regex(encode=True, id_as_group=True),
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event.formatted_body,
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)
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)
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with Cache.lock:
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@ -361,19 +373,20 @@ height=\"32\" src=\"{emote_}\" data-mx-emoticon />""",
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for mention in set(mentions):
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# Unquote just in-case we matched an encoded username.
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username = self.db.fetch_user(urllib.parse.unquote(mention)).get(
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"username"
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)
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username = self.db.fetch_user(
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urllib.parse.unquote(mention.group(0))
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).get("username")
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if username:
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match = re.search(self.id_regex, mention)
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if match:
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if mention.group(2):
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# Replace mention with plain text for hashed users (webhooks)
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message = message.replace(mention.group(0), f"@{username}")
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else:
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# Replace the 'mention' so that the user is tagged
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# in the case of replies aswell.
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# '> <@_discord_1234:localhost> Message'
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for replace in (mention, username):
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for replace in (mention.group(0), username):
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message = message.replace(
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replace, f"<@{match.group()}>"
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replace, f"<@{mention.group(1)}>"
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)
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# We trim the message later as emotes take up extra characters too.
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@ -456,9 +469,10 @@ class DiscordClient(Gateway):
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or message.webhook_id in hook_ids
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)
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def matrixify(self, id: str, user: bool = False) -> str:
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def matrixify(self, id: str, user: bool = False, hashed: str = "") -> str:
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return (
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f"{'@' if user else '#'}{self.app.format}{id}:"
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f"{'@' if user else '#'}{self.app.format}"
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f"{id}{'-' + hashed if hashed else ''}:"
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f"{self.app.server_name}"
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)
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@ -490,11 +504,11 @@ class DiscordClient(Gateway):
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Discord user.
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"""
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if message.webhook_id and not message.application_id:
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hashed = hash_str(message.author.username)
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message.author.id = str(int(message.author.id) + hashed)
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hashed = ""
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if message.webhook_id and message.webhook_id != message.application_id:
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hashed = str(hash_str(message.author.username))
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mxid = self.matrixify(message.author.id, user=True)
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mxid = self.matrixify(message.author.id, user=True, hashed=hashed)
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room_id = self.app.get_room_id(self.matrixify(message.channel_id))
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if not self.app.db.fetch_user(mxid):
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@ -666,14 +680,23 @@ class DiscordClient(Gateway):
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f"<@{char}{member.id}>", f"@{member.username}"
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)
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# `except_deleted` for invalid channels.
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# TODO can this block for too long ?
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for channel in re.findall(f"<#([0-9]{{{discord.ID_LEN}}})>", content):
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discord_channel = except_deleted(self.get_channel)(channel)
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name = (
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discord_channel.name if discord_channel else "deleted-channel"
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)
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content = content.replace(f"<#{channel}>", f"#{name}")
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# Replace channel IDs with names.
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channels = re.findall("<#([0-9]+)>", content)
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if channels:
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if not message.guild_id:
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self.logger.warning(
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f"Message '{message.id}' in channel '{message.channel_id}' does not have a guild_id!"
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)
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else:
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discord_channels = self.get_channels(message.guild_id)
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for channel in channels:
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discord_channel = discord_channels.get(channel)
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name = (
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discord_channel.name
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if discord_channel
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else "deleted-channel"
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)
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content = content.replace(f"<#{channel}>", f"#{name}")
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# { "emote_name": "emote_id" }
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for emote in re.findall(regex, content):
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@ -73,13 +73,12 @@ def except_deleted(fn):
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def hash_str(string: str) -> int:
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"""
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Create the hash for a string (poorly).
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Create the hash for a string
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"""
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hashed = 0
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results = map(ord, string)
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hash = 5381
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for result in results:
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hashed += result
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for ch in string:
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hash = ((hash << 5) + hash) + ord(ch)
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return hashed
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return hash & 0xFFFFFFFF
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