MTPyroger/pyrogram/client/utils.py

# Pyrogram - Telegram MTProto API Client Library for Python
# Copyright (C) 2017-2018 Dan Tès <https://github.com/delivrance>
#
# This file is part of Pyrogram.
#
# Pyrogram is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published
# by the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Pyrogram is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with Pyrogram.  If not, see <http://www.gnu.org/licenses/>.

from base64 import b64decode, b64encode
from struct import pack

from pyrogram.api import types
from pyrogram.client import types as pyrogram_types


def get_peer_id(input_peer) -> int:
    return (
        input_peer.user_id if isinstance(input_peer, types.InputPeerUser)
        else -input_peer.chat_id if isinstance(input_peer, types.InputPeerChat)
        else int("-100" + str(input_peer.channel_id))
    )


def get_input_peer(peer_id: int, access_hash: int):
    return (
        types.InputPeerUser(peer_id, access_hash) if peer_id > 0
        else types.InputPeerChannel(int(str(peer_id)[4:]), access_hash)
        if (str(peer_id).startswith("-100") and access_hash)
        else types.InputPeerChat(-peer_id)
    )


def get_offset_date(dialogs):
    for m in reversed(dialogs.messages):
        if isinstance(m, types.MessageEmpty):
            continue
        else:
            return m.date
    else:
        return 0


def parse_photos(photos):
    if isinstance(photos, types.photos.Photos):
        total_count = len(photos.photos)
    else:
        total_count = photos.count

    user_profile_photos = []

    for photo in photos.photos:
        if isinstance(photo, types.Photo):
            sizes = photo.sizes
            photo_sizes = []

            for size in sizes:
                if isinstance(size, (types.PhotoSize, types.PhotoCachedSize)):
                    loc = size.location

                    if isinstance(size, types.PhotoSize):
                        file_size = size.size
                    else:
                        file_size = len(size.bytes)

                    if isinstance(loc, types.FileLocation):
                        photo_size = pyrogram_types.PhotoSize(
                            file_id=encode(
                                pack(
                                    "<iiqqqqi",
                                    2,
                                    loc.dc_id,
                                    photo.id,
                                    photo.access_hash,
                                    loc.volume_id,
                                    loc.secret,
                                    loc.local_id
                                )
                            ),
                            width=size.w,
                            height=size.h,
                            file_size=file_size,
                            date=photo.date
                        )

                        photo_sizes.append(photo_size)

            user_profile_photos.append(photo_sizes)

    return pyrogram_types.UserProfilePhotos(
        total_count=total_count,
        photos=user_profile_photos
    )


def decode(s: str) -> bytes:
    s = b64decode(s + "=" * (-len(s) % 4), "-_")
    r = b""

    assert s[-1] == 2

    i = 0
    while i < len(s) - 1:
        if s[i] != 0:
            r += bytes([s[i]])
        else:
            r += b"\x00" * s[i + 1]
            i += 1

        i += 1

    return r


def encode(s: bytes) -> str:
    r = b""
    n = 0

    for i in s + bytes([2]):
        if i == 0:
            n += 1
        else:
            if n:
                r += b"\x00" + bytes([n])
                n = 0

            r += bytes([i])

    return b64encode(r, b"-_").decode().rstrip("=")