Telethon/telethon/utils.py

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"""
Utilities for working with the Telegram API itself (such as handy methods
to convert between an entity like an User, Chat, etc. into its Input version)
"""
from mimetypes import add_type, guess_extension
from .tl import TLObject
from .tl.types import (
Channel, ChannelForbidden, Chat, ChatEmpty, ChatForbidden, ChatFull,
ChatPhoto, InputPeerChannel, InputPeerChat, InputPeerUser, InputPeerEmpty,
MessageMediaDocument, MessageMediaPhoto, PeerChannel, InputChannel,
UserEmpty, InputUser, InputUserEmpty, InputUserSelf, InputPeerSelf,
PeerChat, PeerUser, User, UserFull, UserProfilePhoto, Document
)
def get_display_name(entity):
"""Gets the input peer for the given "entity" (user, chat or channel)
Returns None if it was not found"""
if isinstance(entity, User):
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if entity.last_name and entity.first_name:
return '{} {}'.format(entity.first_name, entity.last_name)
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elif entity.first_name:
return entity.first_name
elif entity.last_name:
return entity.last_name
else:
return '(No name)'
if isinstance(entity, Chat) or isinstance(entity, Channel):
return entity.title
return '(unknown)'
# For some reason, .webp (stickers' format) is not registered
add_type('image/webp', '.webp')
def get_extension(media):
"""Gets the corresponding extension for any Telegram media"""
# Photos are always compressed as .jpg by Telegram
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if (isinstance(media, UserProfilePhoto) or isinstance(media, ChatPhoto) or
isinstance(media, MessageMediaPhoto)):
return '.jpg'
# Documents will come with a mime type
if isinstance(media, MessageMediaDocument):
if isinstance(media.document, Document):
if media.document.mime_type == 'application/octet-stream':
# Octet stream are just bytes, which have no default extension
return ''
else:
extension = guess_extension(media.document.mime_type)
return extension if extension else ''
return ''
def _raise_cast_fail(entity, target):
raise ValueError('Cannot cast {} to any kind of {}.'
.format(type(entity).__name__, target))
def get_input_peer(entity):
"""Gets the input peer for the given "entity" (user, chat or channel).
A ValueError is raised if the given entity isn't a supported type."""
if entity is None:
return None
if not isinstance(entity, TLObject):
_raise_cast_fail(entity, 'InputPeer')
if type(entity).subclass_of_id == 0xc91c90b6: # crc32(b'InputPeer')
return entity
if isinstance(entity, User):
if entity.is_self:
return InputPeerSelf()
else:
return InputPeerUser(entity.id, entity.access_hash)
if any(isinstance(entity, c) for c in (
Chat, ChatEmpty, ChatForbidden)):
return InputPeerChat(entity.id)
if any(isinstance(entity, c) for c in (
Channel, ChannelForbidden)):
return InputPeerChannel(entity.id, entity.access_hash)
# Less common cases
if isinstance(entity, UserEmpty):
return InputPeerEmpty()
if isinstance(entity, InputUser):
return InputPeerUser(entity.user_id, entity.access_hash)
if isinstance(entity, UserFull):
return get_input_peer(entity.user)
if isinstance(entity, ChatFull):
return InputPeerChat(entity.id)
if isinstance(entity, PeerChat):
return InputPeerChat(entity.chat_id)
_raise_cast_fail(entity, 'InputPeer')
def get_input_channel(entity):
"""Similar to get_input_peer, but for InputChannel's alone"""
if entity is None:
return None
if not isinstance(entity, TLObject):
_raise_cast_fail(entity, 'InputChannel')
if type(entity).subclass_of_id == 0x40f202fd: # crc32(b'InputChannel')
return entity
if isinstance(entity, Channel) or isinstance(entity, ChannelForbidden):
return InputChannel(entity.id, entity.access_hash)
if isinstance(entity, InputPeerChannel):
return InputChannel(entity.channel_id, entity.access_hash)
_raise_cast_fail(entity, 'InputChannel')
def get_input_user(entity):
"""Similar to get_input_peer, but for InputUser's alone"""
if entity is None:
return None
if not isinstance(entity, TLObject):
_raise_cast_fail(entity, 'InputUser')
if type(entity).subclass_of_id == 0xe669bf46: # crc32(b'InputUser')
return entity
if isinstance(entity, User):
if entity.is_self:
return InputUserSelf()
else:
return InputUser(entity.id, entity.access_hash)
if isinstance(entity, UserEmpty):
return InputUserEmpty()
if isinstance(entity, UserFull):
return get_input_user(entity.user)
if isinstance(entity, InputPeerUser):
return InputUser(entity.user_id, entity.access_hash)
_raise_cast_fail(entity, 'InputUser')
def find_user_or_chat(peer, users, chats):
"""Finds the corresponding user or chat given a peer.
Returns None if it was not found"""
try:
if isinstance(peer, PeerUser):
return next(u for u in users if u.id == peer.user_id)
elif isinstance(peer, PeerChat):
return next(c for c in chats if c.id == peer.chat_id)
elif isinstance(peer, PeerChannel):
return next(c for c in chats if c.id == peer.channel_id)
except StopIteration: return
if isinstance(peer, int):
try: return next(u for u in users if u.id == peer)
except StopIteration: pass
try: return next(c for c in chats if c.id == peer)
except StopIteration: pass
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def get_appropriated_part_size(file_size):
"""Gets the appropriated part size when uploading or downloading files,
given an initial file size"""
if file_size <= 1048576: # 1MB
return 32
if file_size <= 10485760: # 10MB
return 64
if file_size <= 393216000: # 375MB
return 128
if file_size <= 786432000: # 750MB
return 256
if file_size <= 1572864000: # 1500MB
return 512
raise ValueError('File size too large')