111 lines
3.8 KiB
Python
111 lines
3.8 KiB
Python
# mautrix-telegram - A Matrix-Telegram puppeting bridge
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# Copyright (C) 2021 Tulir Asokan
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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from __future__ import annotations
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import re
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from telethon import TelegramClient
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from telethon.helpers import add_surrogate, del_surrogate, strip_text
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from telethon.tl.types import MessageEntityItalic, TypeMessageEntity
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from mautrix.types import MessageEventContent, RoomID
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from ...db import Message as DBMessage
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from ...types import TelegramID
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from .parser import MatrixParser
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command_regex = re.compile(r"^!([A-Za-z0-9@]+)")
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not_command_regex = re.compile(r"^\\(![A-Za-z0-9@]+)")
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MAX_LENGTH = 4096
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CUTOFF_TEXT = " [message cut]"
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CUT_MAX_LENGTH = MAX_LENGTH - len(CUTOFF_TEXT)
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class FormatError(Exception):
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pass
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async def matrix_reply_to_telegram(
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content: MessageEventContent, tg_space: TelegramID, room_id: RoomID | None = None
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) -> TelegramID | None:
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event_id = content.get_reply_to()
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if not event_id:
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return
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content.trim_reply_fallback()
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message = await DBMessage.get_by_mxid(event_id, room_id, tg_space)
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if message:
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return message.tgid
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return None
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async def matrix_to_telegram(
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client: TelegramClient, *, text: str | None = None, html: str | None = None
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) -> tuple[str, list[TypeMessageEntity]]:
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if html is not None:
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return await _matrix_html_to_telegram(client, html)
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elif text is not None:
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return _matrix_text_to_telegram(text)
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else:
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raise ValueError("text or html must be provided to convert formatting")
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async def _matrix_html_to_telegram(
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client: TelegramClient, html: str
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) -> tuple[str, list[TypeMessageEntity]]:
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try:
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html = command_regex.sub(r"<command>\1</command>", html)
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html = html.replace("\t", " " * 4)
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html = not_command_regex.sub(r"\1", html)
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parsed = await MatrixParser(client).parse(add_surrogate(html))
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text, entities = _cut_long_message(parsed.text, parsed.telegram_entities)
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text = del_surrogate(strip_text(text, entities))
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return text, entities
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except Exception as e:
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raise FormatError(f"Failed to convert Matrix format: {html}") from e
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def _cut_long_message(
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message: str, entities: list[TypeMessageEntity]
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) -> tuple[str, list[TypeMessageEntity]]:
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if len(message) > MAX_LENGTH:
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message = message[0:CUT_MAX_LENGTH] + CUTOFF_TEXT
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new_entities = []
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for entity in entities:
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if entity.offset > CUT_MAX_LENGTH:
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continue
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if entity.offset + entity.length > CUT_MAX_LENGTH:
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entity.length = CUT_MAX_LENGTH - entity.offset
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new_entities.append(entity)
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new_entities.append(MessageEntityItalic(CUT_MAX_LENGTH, len(CUTOFF_TEXT)))
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entities = new_entities
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return message, entities
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def _matrix_text_to_telegram(text: str) -> tuple[str, list[TypeMessageEntity]]:
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text = command_regex.sub(r"/\1", text)
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text = text.replace("\t", " " * 4)
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text = not_command_regex.sub(r"\1", text)
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entities = []
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surrogated_text = add_surrogate(text)
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if len(surrogated_text) > MAX_LENGTH:
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surrogated_text, entities = _cut_long_message(surrogated_text, entities)
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text = del_surrogate(surrogated_text)
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return text, entities
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