.

supportbot/__main__.py

@@ -6,10 +6,11 @@ import sys
 import os
 import shelve
 import getopt
+from pickle import Unpickler
 
-import src.core as core
+from . import bot
 
-def start_new_thread(func, join=False, args=(), kwargs={}):
+def start_new_thread(func, join=False, args=(), kwargs=None):
 	t = threading.Thread(target=func, args=args, kwargs=kwargs)
 	if not join:
 		t.daemon = True
@@ -17,22 +18,19 @@ def start_new_thread(func, join=False, args=(), kwargs={}):
 	if join:
 		t.join()
 
-def readopt(name):
-	global opts
-	for e in opts:
-		if e[0] == name:
-			return e[1]
-	return None
-
 def usage():
-	print("Usage: %s [-q|-d] [-c config.yaml]" % sys.argv[0])
+	print("Usage: %s [-q|-d] [-c file]" % sys.argv[0])
 	print("Options:")
 	print("  -h    Display this text")
 	print("  -q    Quiet, set log level to WARNING")
 	print("  -c    Location of config file (default: ./config.yaml)")
 
-def open_db(config):
-	return shelve.open(config["database"])
+# well this is just dumb
+class RenamingUnpickler(Unpickler):
+	def find_class(self, module, name):
+		if module == "src.core":
+			module = "supportbot.bot"
+		return super().find_class(module, name)
 
 def main(configpath, loglevel=logging.INFO):
 	with open(configpath, "r") as f:
@@ -40,12 +38,13 @@ def main(configpath, loglevel=logging.INFO):
 
 	logging.basicConfig(format="%(levelname)-7s [%(asctime)s] %(message)s", datefmt="%Y-%m-%d %H:%M:%S", level=loglevel)
 
-	db = open_db(config)
+	shelve.Unpickler = RenamingUnpickler
+	db = shelve.open(config["database"])
 
-	core.init(config, db)
+	bot.init(config, db)
 
 	try:
-		start_new_thread(core.run, join=True)
+		start_new_thread(bot.run, join=True)
 	except KeyboardInterrupt:
 		logging.info("Interrupted, exiting")
 		db.close()
@@ -57,7 +56,12 @@ if __name__ == "__main__":
 	except getopt.GetoptError as e:
 		print(str(e))
 		exit(1)
+
 	# Process command line args
+	def readopt(name):
+		for e in opts:
+			if e[0] == name:
+				return e[1]
 	if readopt("-h") is not None or readopt("--help") is not None:
 		usage()
 		exit(0)
@@ -67,5 +71,6 @@ if __name__ == "__main__":
 	configpath = "./config.yaml"
 	if readopt("-c") is not None:
 		configpath = readopt("-c")
+
 	# Run the actual program
 	main(configpath, loglevel)

supportbot/bot.py

@@ -0,0 +1,309 @@
+import telebot
+import logging
+import time
+import json
+from datetime import datetime, timedelta
+from typing import Optional
+
+LONG_LONG_TIME = datetime(2100, 1, 1)
+ID_REMIND_DURATION = timedelta(days=2)
+BAN_NOTSENT_WARNING = timedelta(minutes=10)
+ALL_CONTENT_TYPES = ('animation', 'audio', 'contact', 'dice', 'document',
+	'game', 'location', 'photo', 'sticker', 'story', 'text', 'venue', 'video',
+	'video_note', 'voice')
+
+TMessage = telebot.types.Message
+
+bot: telebot.TeleBot = None
+db = None
+
+bot_self_id: int = None
+target_group: Optional[int] = None
+welcome_text: str = None
+reply_text: str = None
+
+def init(config: dict, _db):
+	global bot, db, bot_self_id, target_group, welcome_text, reply_text
+	if not config.get("bot_token"):
+		logging.error("No telegram token specified.")
+		exit(1)
+
+	logging.getLogger("urllib3").setLevel(logging.WARNING) # very noisy with debug otherwise
+
+	bot = telebot.TeleBot(config["bot_token"], threaded=False)
+	db = _db
+	if config.get("target_group"):
+		target_group = int(config["target_group"])
+	welcome_text = config["welcome_text"]
+	reply_text = config["reply_text"]
+
+	set_handler(handle_msg, content_types=ALL_CONTENT_TYPES)
+	bot_self_id = bot.get_me().id
+	logging.info("Startup OK")
+
+def set_handler(func, *args, **kwargs):
+	def wrapper(*args, **kwargs):
+		try:
+			func(*args, **kwargs)
+		except Exception as e:
+			logging.exception("Exception raised in event handler")
+	bot.message_handler(*args, **kwargs)(wrapper)
+
+def run():
+	assert not bot.threaded
+	while True:
+		try:
+			bot.polling(non_stop=True, long_polling_timeout=60)
+		except Exception as e:
+			# you're not supposed to call .polling() more than once but I'm left with no choice
+			logging.warning("%s while polling Telegram, retrying.", type(e).__name__)
+			time.sleep(1)
+
+def callwrapper(f) -> Optional[str]:
+	while True:
+		try:
+			f()
+		except telebot.apihelper.ApiException as e:
+			status = check_telegram_exc(e)
+			if not status:
+				continue
+			return status
+		return
+
+def check_telegram_exc(e):
+	errmsgs = ["bot was blocked by the user", "user is deactivated",
+		"PEER_ID_INVALID", "bot can't initiate conversation"]
+	if any(msg in e.result.text for msg in errmsgs):
+		return "blocked"
+
+	if "Too Many Requests" in e.result.text:
+		d = json.loads(e.result.text)["parameters"]["retry_after"]
+		d = min(d, 30) # supposedly this is in seconds, but you sometimes get 100 or even 2000
+		logging.warning("API rate limit hit, waiting for %ds", d)
+		time.sleep(d)
+		return False # retry
+
+	logging.exception("API exception")
+	return "exception"
+
+### db
+
+class ModificationContext():
+	def __init__(self, key, obj):
+		self.key = key
+		self.obj = obj
+	def __enter__(self) -> 'User':
+		return self.obj
+	def __exit__(self, exc_type, *_):
+		if exc_type is None:
+			db[self.key] = self.obj
+
+class User():
+	id: int
+	username: str
+	realname: str
+	last_messaged: datetime
+	banned_until: Optional[datetime]
+	def __init__(self):
+		self.id = None
+		self.username = None
+		self.realname = None
+		self.last_messaged = None
+		self.banned_until = None
+	def __eq__(self, other):
+		if isinstance(other, User):
+			return self.id == other.id
+		return NotImplemented
+	def __str__(self):
+		return "<User id=%d>" % self.id
+	def defaults(self):
+		self.last_messaged = datetime(1970, 1, 1)
+
+# this is kinda shit
+db_last_sync = 0
+def db_auto_sync():
+	global db_last_sync
+	now = int(time.time())
+	if now > db_last_sync + 15:
+		db_last_sync = now
+		db.sync()
+#
+
+def db_get_user(id) -> User:
+	return db["u%d" % id]
+
+def db_modify_user(id, allow_new=False) -> ModificationContext:
+	key = "u%d" % id
+	obj = db.get(key)
+	if obj is None:
+		if allow_new:
+			obj = User()
+		else:
+			raise KeyError
+	return ModificationContext(key, obj)
+
+### Main stuff
+
+def handle_msg(ev: TMessage):
+	db_auto_sync()
+	if ev.chat.type in ("group", "supergroup"):
+		if ev.chat.id == target_group:
+			return handle_group(ev)
+		logging.warning("Got message from group %d which "
+			"we're not supposed to be in", ev.chat.id)
+	elif ev.chat.type == "private":
+		return handle_private(ev)
+
+def handle_group(ev: TMessage):
+	if ev.reply_to_message is None:
+		return
+	if ev.reply_to_message.from_user.id != bot_self_id:
+		return
+
+	user_id = db.get("m%d" % ev.reply_to_message.message_id)
+	logging.debug("found id = %d mapped to user %s", ev.reply_to_message.message_id, user_id)
+	if user_id is None:
+		logging.warning("Couldn't find replied to message in target group")
+		return
+
+	# handle commands
+	if ev.content_type == "text" and ev.text.startswith("/"):
+		c, _, arg = ev.text[1:].partition(" ")
+		return handle_group_command(ev, user_id, c, arg)
+
+	user = db_get_user(user_id)
+	now = datetime.now()
+	if user.banned_until is not None and (user.banned_until >= now and
+		now - user.last_messaged >= BAN_NOTSENT_WARNING):
+		msg = "Message was not delivered, unban recipient first."
+		return callwrapper(lambda: bot.send_message(target_group, msg))
+
+	# deliver message
+	res = callwrapper(lambda: bot.copy_message(user_id, ev.chat.id, ev.message_id))
+	if res == "blocked":
+		callwrapper(lambda: bot.send_message(target_group, "Bot was blocked by user."))
+
+def handle_group_command(ev: TMessage, user_id: int, c: str, arg: str):
+	if c == "info":
+		msg = format_user_info(db_get_user(user_id))
+		return callwrapper(lambda: bot.send_message(target_group, msg, parse_mode="HTML"))
+	elif c == "ban":
+		delta = parse_timedelta(arg)
+		if not delta:
+			until = LONG_LONG_TIME
+			msg = "User banned permanently."
+		else:
+			until = datetime.now() + delta
+			msg = "User banned until %s." % format_datetime(until)
+		with db_modify_user(user_id) as user:
+			user.banned_until = until
+		return callwrapper(lambda: bot.send_message(target_group, msg))
+	elif c == "unban":
+		msg = None
+		with db_modify_user(user_id) as user:
+			if user.banned_until is None or user.banned_until < datetime.now():
+				msg = "User was not banned or ban expired already."
+			else:
+				user.banned_until = None
+				msg = "User was unbanned."
+			return callwrapper(lambda: bot.send_message(target_group, msg))
+
+def handle_private(ev: TMessage):
+	if target_group is None:
+		logging.error("Target group not set, dropping message from user!")
+		return
+
+	# refresh user in db
+	now = datetime.now()
+	with db_modify_user(ev.chat.id, allow_new=True) as user:
+		if user.id is None:
+			user.defaults()
+			user.id = ev.chat.id
+			assert ev.chat.id == ev.from_user.id
+		user.username = ev.from_user.username
+		user.realname = ev.from_user.first_name
+		if ev.from_user.last_name:
+			user.realname += " " + ev.from_user.last_name
+
+	# check things
+	error = None
+	if user.banned_until is not None:
+		if now >= user.banned_until:
+			pass
+		elif user.banned_until >= LONG_LONG_TIME:
+			error = "You cannot message the support bot."
+		else:
+			error = "You cannot message the support bot now, try again later."
+	if error is not None:
+		return callwrapper(lambda: bot.send_message(ev.chat.id, error))
+
+	# handle commands
+	if ev.content_type == "text" and ev.text.startswith("/"):
+		c = ev.text[1:].split(" ", 1)[0]
+		if handle_private_command(ev, user, c):
+			return
+
+	# deliver message
+	if ev.forward_origin is not None:
+		msg = "It is not possible to forward messages here."
+		return callwrapper(lambda: bot.send_message(ev.chat.id, msg))
+
+	if now - user.last_messaged >= ID_REMIND_DURATION:
+		msg = "---------------------------------------\n"
+		msg += format_user_info(user)
+		callwrapper(lambda: bot.send_message(target_group, msg, parse_mode="HTML"))
+	def f(user_id=user.id):
+		ev2 = bot.forward_message(target_group, ev.chat.id, ev.message_id)
+		db["m%d" % ev2.message_id] = user_id
+		logging.debug("delivered msg from %s -> id = %d", user, ev2.message_id)
+	callwrapper(f)
+
+	if reply_text:
+		callwrapper(lambda: bot.send_message(ev.chat.id, reply_text, parse_mode="HTML"))
+
+	with db_modify_user(user.id) as user:
+		user.last_messaged = now
+
+def handle_private_command(ev: TMessage, user, c):
+	if c == "start":
+		callwrapper(lambda: bot.send_message(ev.chat.id, welcome_text, parse_mode="HTML"))
+		return True
+	elif c == "stop":
+		return True
+
+### Helpers
+
+def str_is_printable(s):
+	NOT_PRINTABLE = (0x20, 0x115f, 0x1160, 0x3164, 0xffa0)
+	return any((c.isprintable() and ord(c) not in NOT_PRINTABLE) for c in s)
+
+def parse_timedelta(s):
+	if len(s) < 2 or not s[:-1].isdigit():
+		return
+	suff = s[-1].lower()
+	suff = ({"s": 1, "m": 60, "h": 60*60, "d": 24*60*60, "w": 7*24*60*60}).get(suff)
+	if not suff:
+		return
+	return timedelta(seconds=int(s[:-1]) * suff)
+
+def escape_html(s):
+	ret = ""
+	for c in s:
+		if c in ("<", ">", "&"):
+			c = "&#" + str(ord(c)) + ";"
+		ret += c
+	return ret
+
+def format_datetime(dt):
+	return dt.strftime("%Y-%m-%d %H:%M:%S")
+
+def format_user_info(user):
+	realname = user.realname
+	if not str_is_printable(realname):
+		realname = "<empty name>"
+	s = "User: <a href=\"tg://user?id=%d\">%s</a>" % (
+		user.id, escape_html(realname))
+	if user.username is not None:
+		s += " (@%s)" % escape_html(user.username)
+	s += "\nID: <code>%d</code>" % user.id
+	return s