mirror of
https://github.com/LonamiWebs/Telethon.git
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324 lines
11 KiB
Python
324 lines
11 KiB
Python
import json
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import os
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import sqlite3
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from base64 import b64decode
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from os.path import isfile as file_exists
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from threading import Lock, RLock
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from .memory import MemorySession, _SentFileType
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from .. import utils
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from ..crypto import AuthKey
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from ..tl.types import (
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InputPhoto, InputDocument, PeerUser, PeerChat, PeerChannel
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)
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EXTENSION = '.session'
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CURRENT_VERSION = 3 # database version
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class SQLiteSession(MemorySession):
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"""This session contains the required information to login into your
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Telegram account. NEVER give the saved JSON file to anyone, since
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they would gain instant access to all your messages and contacts.
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If you think the session has been compromised, close all the sessions
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through an official Telegram client to revoke the authorization.
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"""
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def __init__(self, session_id=None):
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super().__init__()
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"""session_user_id should either be a string or another Session.
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Note that if another session is given, only parameters like
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those required to init a connection will be copied.
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"""
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# These values will NOT be saved
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self.filename = ':memory:'
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self.save_entities = True
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if session_id:
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self.filename = session_id
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if not self.filename.endswith(EXTENSION):
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self.filename += EXTENSION
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# Cross-thread safety
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self._seq_no_lock = Lock()
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self._msg_id_lock = Lock()
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self._db_lock = RLock()
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# Migrating from .json -> SQL
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entities = self._check_migrate_json()
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self._conn = None
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c = self._cursor()
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c.execute("select name from sqlite_master "
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"where type='table' and name='version'")
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if c.fetchone():
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# Tables already exist, check for the version
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c.execute("select version from version")
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version = c.fetchone()[0]
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if version != CURRENT_VERSION:
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self._upgrade_database(old=version)
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c.execute("delete from version")
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c.execute("insert into version values (?)", (CURRENT_VERSION,))
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self.save()
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# These values will be saved
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c.execute('select * from sessions')
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tuple_ = c.fetchone()
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if tuple_:
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self._dc_id, self._server_address, self._port, key, = tuple_
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self._auth_key = AuthKey(data=key)
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c.close()
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else:
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# Tables don't exist, create new ones
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self._create_table(
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c,
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"version (version integer primary key)"
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,
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"""sessions (
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dc_id integer primary key,
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server_address text,
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port integer,
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auth_key blob
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)"""
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,
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"""entities (
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id integer primary key,
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hash integer not null,
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username text,
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phone integer,
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name text
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)"""
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,
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"""sent_files (
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md5_digest blob,
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file_size integer,
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type integer,
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id integer,
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hash integer,
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primary key(md5_digest, file_size, type)
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)"""
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)
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c.execute("insert into version values (?)", (CURRENT_VERSION,))
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# Migrating from JSON -> new table and may have entities
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if entities:
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c.executemany(
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'insert or replace into entities values (?,?,?,?,?)',
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entities
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)
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self._update_session_table()
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c.close()
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self.save()
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def clone(self, to_instance=None):
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cloned = super().clone(to_instance)
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cloned.save_entities = self.save_entities
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return cloned
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def _check_migrate_json(self):
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if file_exists(self.filename):
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try:
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with open(self.filename, encoding='utf-8') as f:
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data = json.load(f)
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self.delete() # Delete JSON file to create database
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self._port = data.get('port', self._port)
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self._server_address = \
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data.get('server_address', self._server_address)
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if data.get('auth_key_data', None) is not None:
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key = b64decode(data['auth_key_data'])
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self._auth_key = AuthKey(data=key)
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rows = []
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for p_id, p_hash in data.get('entities', []):
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if p_hash is not None:
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rows.append((p_id, p_hash, None, None, None))
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return rows
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except UnicodeDecodeError:
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return [] # No entities
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def _upgrade_database(self, old):
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c = self._cursor()
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# old == 1 doesn't have the old sent_files so no need to drop
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if old == 2:
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# Old cache from old sent_files lasts then a day anyway, drop
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c.execute('drop table sent_files')
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self._create_table(c, """sent_files (
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md5_digest blob,
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file_size integer,
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type integer,
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id integer,
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hash integer,
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primary key(md5_digest, file_size, type)
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)""")
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c.close()
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@staticmethod
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def _create_table(c, *definitions):
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"""
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Creates a table given its definition 'name (columns).
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If the sqlite version is >= 3.8.2, it will use "without rowid".
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See http://www.sqlite.org/releaselog/3_8_2.html.
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"""
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required = (3, 8, 2)
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sqlite_v = tuple(int(x) for x in sqlite3.sqlite_version.split('.'))
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extra = ' without rowid' if sqlite_v >= required else ''
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for definition in definitions:
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c.execute('create table {}{}'.format(definition, extra))
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# Data from sessions should be kept as properties
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# not to fetch the database every time we need it
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def set_dc(self, dc_id, server_address, port):
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super().set_dc(dc_id, server_address, port)
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self._update_session_table()
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# Fetch the auth_key corresponding to this data center
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c = self._cursor()
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c.execute('select auth_key from sessions')
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tuple_ = c.fetchone()
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if tuple_ and tuple_[0]:
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self._auth_key = AuthKey(data=tuple_[0])
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else:
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self._auth_key = None
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c.close()
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@MemorySession.auth_key.setter
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def auth_key(self, value):
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self._auth_key = value
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self._update_session_table()
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def _update_session_table(self):
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with self._db_lock:
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c = self._cursor()
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# While we can save multiple rows into the sessions table
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# currently we only want to keep ONE as the tables don't
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# tell us which auth_key's are usable and will work. Needs
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# some more work before being able to save auth_key's for
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# multiple DCs. Probably done differently.
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c.execute('delete from sessions')
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c.execute('insert or replace into sessions values (?,?,?,?)', (
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self._dc_id,
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self._server_address,
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self._port,
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self._auth_key.key if self._auth_key else b''
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))
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c.close()
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def save(self):
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"""Saves the current session object as session_user_id.session"""
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with self._db_lock:
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self._conn.commit()
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def _cursor(self):
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"""Asserts that the connection is open and returns a cursor"""
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with self._db_lock:
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if self._conn is None:
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self._conn = sqlite3.connect(self.filename,
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check_same_thread=False)
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return self._conn.cursor()
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def close(self):
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"""Closes the connection unless we're working in-memory"""
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if self.filename != ':memory:':
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with self._db_lock:
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if self._conn is not None:
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self._conn.close()
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self._conn = None
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def delete(self):
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"""Deletes the current session file"""
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if self.filename == ':memory:':
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return True
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try:
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os.remove(self.filename)
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return True
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except OSError:
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return False
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@classmethod
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def list_sessions(cls):
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"""Lists all the sessions of the users who have ever connected
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using this client and never logged out
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"""
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return [os.path.splitext(os.path.basename(f))[0]
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for f in os.listdir('.') if f.endswith(EXTENSION)]
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# Entity processing
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def process_entities(self, tlo):
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"""Processes all the found entities on the given TLObject,
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unless .enabled is False.
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Returns True if new input entities were added.
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"""
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if not self.save_entities:
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return
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rows = self._entities_to_rows(tlo)
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if not rows:
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return
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with self._db_lock:
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self._cursor().executemany(
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'insert or replace into entities values (?,?,?,?,?)', rows
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)
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self.save()
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def _fetchone_entity(self, query, args):
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c = self._cursor()
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c.execute(query, args)
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return c.fetchone()
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def get_entity_rows_by_phone(self, phone):
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return self._fetchone_entity(
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'select id, hash from entities where phone=?', (phone,))
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def get_entity_rows_by_username(self, username):
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return self._fetchone_entity(
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'select id, hash from entities where username=?', (username,))
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def get_entity_rows_by_name(self, name):
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return self._fetchone_entity(
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'select id, hash from entities where name=?', (name,))
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def get_entity_rows_by_id(self, id, exact=True):
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if exact:
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return self._fetchone_entity(
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'select id, hash from entities where id=?', (id,))
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else:
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ids = (
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utils.get_peer_id(PeerUser(id)),
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utils.get_peer_id(PeerChat(id)),
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utils.get_peer_id(PeerChannel(id))
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)
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return self._fetchone_entity(
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'select id, hash from entities where id in (?,?,?)', ids
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)
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# File processing
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def get_file(self, md5_digest, file_size, cls):
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tuple_ = self._cursor().execute(
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'select id, hash from sent_files '
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'where md5_digest = ? and file_size = ? and type = ?',
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(md5_digest, file_size, _SentFileType.from_type(cls).value)
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).fetchone()
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if tuple_:
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# Both allowed classes have (id, access_hash) as parameters
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return cls(tuple_[0], tuple_[1])
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def cache_file(self, md5_digest, file_size, instance):
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if not isinstance(instance, (InputDocument, InputPhoto)):
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raise TypeError('Cannot cache %s instance' % type(instance))
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with self._db_lock:
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self._cursor().execute(
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'insert or replace into sent_files values (?,?,?,?,?)', (
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md5_digest, file_size,
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_SentFileType.from_type(type(instance)).value,
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instance.id, instance.access_hash
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))
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self.save()
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