369 lines
12 KiB
Python
369 lines
12 KiB
Python
import datetime
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import os
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import time
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from ..tl import types
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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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try:
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import sqlite3
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sqlite3_err = None
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except ImportError as e:
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sqlite3 = None
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sqlite3_err = type(e)
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EXTENSION = '.session'
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CURRENT_VERSION = 7 # 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 session 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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if sqlite3 is None:
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raise sqlite3_err
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super().__init__()
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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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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, \
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self._takeout_id = 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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takeout_id integer
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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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date integer
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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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"""update_state (
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id integer primary key,
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pts integer,
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qts integer,
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date integer,
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seq integer
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)"""
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)
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c.execute("insert into version values (?)", (CURRENT_VERSION,))
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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 _upgrade_database(self, old):
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c = self._cursor()
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if old == 1:
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old += 1
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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 += 1
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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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if old == 3:
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old += 1
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self._create_table(c, """update_state (
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id integer primary key,
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pts integer,
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qts integer,
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date integer,
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seq integer
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)""")
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if old == 4:
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old += 1
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c.execute("alter table sessions add column takeout_id integer")
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if old == 5:
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# Not really any schema upgrade, but potentially all access
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# hashes for User and Channel are wrong, so drop them off.
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old += 1
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c.execute('delete from entities')
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if old == 6:
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old += 1
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c.execute("alter table entities add column date integer")
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c.close()
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@staticmethod
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def _create_table(c, *definitions):
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for definition in definitions:
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c.execute('create table {}'.format(definition))
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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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row = self._execute('select auth_key from sessions')
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if row and row[0]:
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self._auth_key = AuthKey(data=row[0])
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else:
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self._auth_key = None
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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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@MemorySession.takeout_id.setter
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def takeout_id(self, value):
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self._takeout_id = value
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self._update_session_table()
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def _update_session_table(self):
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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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self._takeout_id
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))
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c.close()
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def get_update_state(self, entity_id):
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row = self._execute('select pts, qts, date, seq from update_state '
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'where id = ?', entity_id)
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if row:
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pts, qts, date, seq = row
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date = datetime.datetime.fromtimestamp(
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date, tz=datetime.timezone.utc)
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return types.updates.State(pts, qts, date, seq, unread_count=0)
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def set_update_state(self, entity_id, state):
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self._execute('insert or replace into update_state values (?,?,?,?,?)',
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entity_id, state.pts, state.qts,
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state.date.timestamp(), state.seq)
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def get_update_states(self):
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c = self._cursor()
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try:
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rows = c.execute('select id, pts, qts, date, seq from update_state').fetchall()
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return ((row[0], types.updates.State(
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pts=row[1],
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qts=row[2],
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date=datetime.datetime.fromtimestamp(row[3], tz=datetime.timezone.utc),
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seq=row[4],
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unread_count=0)
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) for row in rows)
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finally:
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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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# This is a no-op if there are no changes to commit, so there's
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# no need for us to keep track of an "unsaved changes" variable.
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if self._conn is not None:
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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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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 _execute(self, stmt, *values):
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"""
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Gets a cursor, executes `stmt` and closes the cursor,
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fetching one row afterwards and returning its result.
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"""
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c = self._cursor()
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try:
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return c.execute(stmt, values).fetchone()
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finally:
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c.close()
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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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if self._conn is not None:
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self._conn.commit()
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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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"""
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Processes all the found entities on the given TLObject,
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unless .save_entities is False.
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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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c = self._cursor()
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try:
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now_tup = (int(time.time()),)
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rows = [row + now_tup for row in rows]
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c.executemany(
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'insert or replace into entities values (?,?,?,?,?,?)', rows)
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finally:
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c.close()
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def get_entity_rows_by_phone(self, phone):
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return self._execute(
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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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c = self._cursor()
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try:
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results = c.execute(
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'select id, hash, date from entities where username = ?',
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(username,)
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).fetchall()
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if not results:
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return None
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# If there is more than one result for the same username, evict the oldest one
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if len(results) > 1:
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results.sort(key=lambda t: t[2] or 0)
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c.executemany('update entities set username = null where id = ?',
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[(t[0],) for t in results[:-1]])
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return results[-1][0], results[-1][1]
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finally:
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c.close()
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def get_entity_rows_by_name(self, name):
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return self._execute(
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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._execute(
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'select id, hash from entities where id = ?', id)
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else:
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return self._execute(
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'select id, hash from entities where id in (?,?,?)',
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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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# File processing
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def get_file(self, md5_digest, file_size, cls):
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row = self._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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)
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if row:
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# Both allowed classes have (id, access_hash) as parameters
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return cls(row[0], row[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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self._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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