Database/sql/antiflood_sql.py

"""
MIT License

Copyright (c) 2022 Aʙɪsʜɴᴏɪ

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

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 OR COPYRIGHT HOLDERS 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.
"""

import threading

from sqlalchemy import BigInteger, Column, String, UnicodeText

from Database.sql import BASE, SESSION

DEF_COUNT = 1
DEF_LIMIT = 0
DEF_OBJ = (None, DEF_COUNT, DEF_LIMIT)


class FloodControl(BASE):
    __tablename__ = "antiflood"
    chat_id = Column(String(14), primary_key=True)
    user_id = Column(BigInteger)
    count = Column(BigInteger, default=DEF_COUNT)
    limit = Column(BigInteger, default=DEF_LIMIT)

    def __init__(self, chat_id):
        self.chat_id = str(chat_id)  # ensure string

    def __repr__(self):
        return "<ғʟᴏᴏᴅ ᴄᴏɴᴛʀᴏʟ ғᴏʀ %s>" % self.chat_id


class FloodSettings(BASE):
    __tablename__ = "antiflood_settings"
    chat_id = Column(String(14), primary_key=True)
    flood_type = Column(BigInteger, default=1)
    value = Column(UnicodeText, default="0")

    def __init__(self, chat_id, flood_type=1, value="0"):
        self.chat_id = str(chat_id)
        self.flood_type = flood_type
        self.value = value

    def __repr__(self):
        return "<{} ᴡɪʟʟ ᴇxᴇᴄᴜᴛɪɴɢ {} ғᴏʀ ғʟᴏᴏᴅ.>".format(self.chat_id, self.flood_type)


FloodControl.__table__.create(checkfirst=True)
FloodSettings.__table__.create(checkfirst=True)

INSERTION_FLOOD_LOCK = threading.RLock()
INSERTION_FLOOD_SETTINGS_LOCK = threading.RLock()

CHAT_FLOOD = {}


def set_flood(chat_id, amount):
    with INSERTION_FLOOD_LOCK:
        flood = SESSION.query(FloodControl).get(str(chat_id))
        if not flood:
            flood = FloodControl(str(chat_id))

        flood.user_id = None
        flood.limit = amount

        CHAT_FLOOD[str(chat_id)] = (None, DEF_COUNT, amount)

        SESSION.add(flood)
        SESSION.commit()


def update_flood(chat_id: str, user_id) -> bool:
    if str(chat_id) not in CHAT_FLOOD:
        return

    curr_user_id, count, limit = CHAT_FLOOD.get(str(chat_id), DEF_OBJ)

    if limit == 0:  # no antiflood
        return False

    if user_id != curr_user_id or user_id is None:  # other user
        CHAT_FLOOD[str(chat_id)] = (user_id, DEF_COUNT, limit)
        return False

    count += 1
    if count > limit:  # too many msgs, kick
        CHAT_FLOOD[str(chat_id)] = (None, DEF_COUNT, limit)
        return True

    # default -> update
    CHAT_FLOOD[str(chat_id)] = (user_id, count, limit)
    return False


def get_flood_limit(chat_id):
    return CHAT_FLOOD.get(str(chat_id), DEF_OBJ)[2]


def set_flood_strength(chat_id, flood_type, value):
    # ғᴏʀ ғʟᴏᴏᴅ_ᴛʏᴘᴇ
    # 1 = ban
    # 2 = kick
    # 3 = mute
    # 4 = tban
    # 5 = tmute
    # 6 = ᴅᴍᴜᴛᴇ sᴏᴏɴ
    with INSERTION_FLOOD_SETTINGS_LOCK:
        curr_setting = SESSION.query(FloodSettings).get(str(chat_id))
        if not curr_setting:
            curr_setting = FloodSettings(
                chat_id,
                flood_type=int(flood_type),
                value=value,
            )

        curr_setting.flood_type = int(flood_type)
        curr_setting.value = str(value)

        SESSION.add(curr_setting)
        SESSION.commit()


def get_flood_setting(chat_id):
    try:
        setting = SESSION.query(FloodSettings).get(str(chat_id))
        if setting:
            return setting.flood_type, setting.value
        return 1, "0"

    finally:
        SESSION.close()


def migrate_chat(old_chat_id, new_chat_id):
    with INSERTION_FLOOD_LOCK:
        flood = SESSION.query(FloodControl).get(str(old_chat_id))
        if flood:
            CHAT_FLOOD[str(new_chat_id)] = CHAT_FLOOD.get(str(old_chat_id), DEF_OBJ)
            flood.chat_id = str(new_chat_id)
            SESSION.commit()

        SESSION.close()


def __load_flood_settings():
    global CHAT_FLOOD
    try:
        all_chats = SESSION.query(FloodControl).all()
        CHAT_FLOOD = {chat.chat_id: (None, DEF_COUNT, chat.limit) for chat in all_chats}
    finally:
        SESSION.close()


__load_flood_settings()