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import itertools
import re
import typing
from .. import helpers, utils
from ..tl import types
if typing.TYPE_CHECKING:
from .telegramclient import TelegramClient
class MessageParseMethods:
# region Public properties
@property
def parse_mode(self: 'TelegramClient'):
"""
This property is the default parse mode used when sending messages.
Defaults to `telethon.extensions.markdown`. It will always
be either `None` or an object with ``parse`` and ``unparse``
methods.
When setting a different value it should be one of:
* Object with ``parse`` and ``unparse`` methods.
* A ``callable`` to act as the parse method.
* A `str` indicating the ``parse_mode``. For Markdown ``'md'``
or ``'markdown'`` may be used. For HTML, ``'htm'`` or ``'html'``
may be used.
The ``parse`` method should be a function accepting a single
parameter, the text to parse, and returning a tuple consisting
of ``(parsed message str, [MessageEntity instances])``.
The ``unparse`` method should be the inverse of ``parse`` such
that ``assert text == unparse(*parse(text))``.
See :tl:`MessageEntity` for allowed message entities.
Example
.. code-block:: python
# Disabling default formatting
client.parse_mode = None
# Enabling HTML as the default format
client.parse_mode = 'html'
"""
return self._parse_mode
@parse_mode.setter
def parse_mode(self: 'TelegramClient', mode: str):
self._parse_mode = utils.sanitize_parse_mode(mode)
# endregion
# region Private methods
async def _replace_with_mention(self: 'TelegramClient', entities, i, user):
"""
Helper method to replace ``entities[i]`` to mention ``user``,
or do nothing if it can't be found.
"""
try:
entities[i] = types.InputMessageEntityMentionName(
entities[i].offset, entities[i].length,
await self.get_input_entity(user)
)
return True
except (ValueError, TypeError):
return False
async def _parse_message_text(self: 'TelegramClient', message, parse_mode):
"""
Returns a (parsed message, entities) tuple depending on ``parse_mode``.
"""
if parse_mode == ():
parse_mode = self._parse_mode
else:
parse_mode = utils.sanitize_parse_mode(parse_mode)
if not parse_mode:
return message, []
original_message = message
message, msg_entities = parse_mode.parse(message)
if original_message and not message and not msg_entities:
raise ValueError("Failed to parse message")
for i in reversed(range(len(msg_entities))):
e = msg_entities[i]
if not e.length:
# 0-length MessageEntity is no longer valid #3884.
# Because the user can provide their own parser (with reasonable 0-length
# entities), strip them here rather than fixing the built-in parsers.
del msg_entities[i]
elif isinstance(e, types.MessageEntityTextUrl):
m = re.match(r'^@|\+|tg://user\?id=(\d+)', e.url)
if m:
user = int(m.group(1)) if m.group(1) else e.url
is_mention = await self._replace_with_mention(msg_entities, i, user)
if not is_mention:
del msg_entities[i]
elif isinstance(e, (types.MessageEntityMentionName,
types.InputMessageEntityMentionName)):
is_mention = await self._replace_with_mention(msg_entities, i, e.user_id)
if not is_mention:
del msg_entities[i]
return message, msg_entities
def _get_response_message(self: 'TelegramClient', request, result, input_chat):
"""
Extracts the response message known a request and Update result.
The request may also be the ID of the message to match.
If ``request is None`` this method returns ``{id: message}``.
If ``request.random_id`` is a list, this method returns a list too.
"""
if isinstance(result, types.UpdateShort):
updates = [result.update]
entities = {}
elif isinstance(result, (types.Updates, types.UpdatesCombined)):
updates = result.updates
entities = {utils.get_peer_id(x): x
for x in
itertools.chain(result.users, result.chats)}
else:
return None
random_to_id = {}
id_to_message = {}
for update in updates:
if isinstance(update, types.UpdateMessageID):
random_to_id[update.random_id] = update.id
elif isinstance(update, (
types.UpdateNewChannelMessage, types.UpdateNewMessage)):
update.message._finish_init(self, entities, input_chat)
# Pinning a message with `updatePinnedMessage` seems to
# always produce a service message we can't map so return
# it directly. The same happens for kicking users.
#
# It could also be a list (e.g. when sending albums).
#
# TODO this method is getting messier and messier as time goes on
if hasattr(request, 'random_id') or utils.is_list_like(request):
id_to_message[update.message.id] = update.message
else:
return update.message
elif (isinstance(update, types.UpdateEditMessage)
and helpers._entity_type(request.peer) != helpers._EntityType.CHANNEL):
update.message._finish_init(self, entities, input_chat)
# Live locations use `sendMedia` but Telegram responds with
# `updateEditMessage`, which means we won't have `id` field.
if hasattr(request, 'random_id'):
id_to_message[update.message.id] = update.message
elif request.id == update.message.id:
return update.message
elif (isinstance(update, types.UpdateEditChannelMessage)
and utils.get_peer_id(request.peer) ==
utils.get_peer_id(update.message.peer_id)):
if request.id == update.message.id:
update.message._finish_init(self, entities, input_chat)
return update.message
elif isinstance(update, types.UpdateNewScheduledMessage):
update.message._finish_init(self, entities, input_chat)
# Scheduled IDs may collide with normal IDs. However, for a
# single request there *shouldn't* be a mix between "some
# scheduled and some not".
id_to_message[update.message.id] = update.message
elif isinstance(update, types.UpdateMessagePoll):
if request.media.poll.id == update.poll_id:
m = types.Message(
id=request.id,
peer_id=utils.get_peer(request.peer),
media=types.MessageMediaPoll(
poll=update.poll,
results=update.results
)
)
m._finish_init(self, entities, input_chat)
return m
if request is None:
return id_to_message
random_id = request if isinstance(request, (int, list)) else getattr(request, 'random_id', None)
if random_id is None:
# Can happen when pinning a message does not actually produce a service message.
self._log[__name__].warning(
'No random_id in %s to map to, returning None message for %s', request, result)
return None
if not utils.is_list_like(random_id):
msg = id_to_message.get(random_to_id.get(random_id))
if not msg:
self._log[__name__].warning(
'Request %s had missing message mapping %s', request, result)
return msg
try:
return [id_to_message[random_to_id[rnd]] for rnd in random_id]
except KeyError:
# Sometimes forwards fail (`MESSAGE_ID_INVALID` if a message gets
# deleted or `WORKER_BUSY_TOO_LONG_RETRY` if there are issues at
# Telegram), in which case we get some "missing" message mappings.
# Log them with the hope that we can better work around them.
#
# This also happens when trying to forward messages that can't
# be forwarded because they don't exist (0, service, deleted)
# among others which could be (like deleted or existing).
self._log[__name__].warning(
'Request %s had missing message mappings %s', request, result)
return [
id_to_message.get(random_to_id[rnd])
if rnd in random_to_id
else None
for rnd in random_id
]
# endregion
|
