303 lines
11 KiB
Python
303 lines
11 KiB
Python
"""Telegram channel implementation using python-telegram-bot."""
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import asyncio
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import re
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from loguru import logger
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from telegram import Update
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from telegram.ext import Application, MessageHandler, filters, ContextTypes
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from nanobot.bus.events import OutboundMessage
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from nanobot.bus.queue import MessageBus
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from nanobot.channels.base import BaseChannel
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from nanobot.config.schema import TelegramConfig
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def _markdown_to_telegram_html(text: str) -> str:
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"""
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Convert markdown to Telegram-safe HTML.
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"""
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if not text:
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return ""
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# 1. Extract and protect code blocks (preserve content from other processing)
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code_blocks: list[str] = []
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def save_code_block(m: re.Match) -> str:
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code_blocks.append(m.group(1))
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return f"\x00CB{len(code_blocks) - 1}\x00"
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text = re.sub(r'```[\w]*\n?([\s\S]*?)```', save_code_block, text)
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# 2. Extract and protect inline code
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inline_codes: list[str] = []
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def save_inline_code(m: re.Match) -> str:
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inline_codes.append(m.group(1))
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return f"\x00IC{len(inline_codes) - 1}\x00"
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text = re.sub(r'`([^`]+)`', save_inline_code, text)
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# 3. Headers # Title -> just the title text
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text = re.sub(r'^#{1,6}\s+(.+)$', r'\1', text, flags=re.MULTILINE)
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# 4. Blockquotes > text -> just the text (before HTML escaping)
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text = re.sub(r'^>\s*(.*)$', r'\1', text, flags=re.MULTILINE)
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# 5. Escape HTML special characters
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text = text.replace("&", "&").replace("<", "<").replace(">", ">")
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# 6. Links [text](url) - must be before bold/italic to handle nested cases
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text = re.sub(r'\[([^\]]+)\]\(([^)]+)\)', r'<a href="\2">\1</a>', text)
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# 7. Bold **text** or __text__
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text = re.sub(r'\*\*(.+?)\*\*', r'<b>\1</b>', text)
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text = re.sub(r'__(.+?)__', r'<b>\1</b>', text)
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# 8. Italic _text_ (avoid matching inside words like some_var_name)
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text = re.sub(r'(?<![a-zA-Z0-9])_([^_]+)_(?![a-zA-Z0-9])', r'<i>\1</i>', text)
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# 9. Strikethrough ~~text~~
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text = re.sub(r'~~(.+?)~~', r'<s>\1</s>', text)
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# 10. Bullet lists - item -> • item
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text = re.sub(r'^[-*]\s+', '• ', text, flags=re.MULTILINE)
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# 11. Restore inline code with HTML tags
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for i, code in enumerate(inline_codes):
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# Escape HTML in code content
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escaped = code.replace("&", "&").replace("<", "<").replace(">", ">")
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text = text.replace(f"\x00IC{i}\x00", f"<code>{escaped}</code>")
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# 12. Restore code blocks with HTML tags
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for i, code in enumerate(code_blocks):
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# Escape HTML in code content
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escaped = code.replace("&", "&").replace("<", "<").replace(">", ">")
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text = text.replace(f"\x00CB{i}\x00", f"<pre><code>{escaped}</code></pre>")
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return text
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class TelegramChannel(BaseChannel):
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"""
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Telegram channel using long polling.
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Simple and reliable - no webhook/public IP needed.
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"""
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name = "telegram"
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def __init__(self, config: TelegramConfig, bus: MessageBus, groq_api_key: str = ""):
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super().__init__(config, bus)
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self.config: TelegramConfig = config
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self.groq_api_key = groq_api_key
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self._app: Application | None = None
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self._chat_ids: dict[str, int] = {} # Map sender_id to chat_id for replies
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async def start(self) -> None:
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"""Start the Telegram bot with long polling."""
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if not self.config.token:
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logger.error("Telegram bot token not configured")
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return
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self._running = True
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# Build the application
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self._app = (
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Application.builder()
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.token(self.config.token)
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.build()
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)
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# Add message handler for text, photos, voice, documents
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self._app.add_handler(
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MessageHandler(
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(filters.TEXT | filters.PHOTO | filters.VOICE | filters.AUDIO | filters.Document.ALL)
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& ~filters.COMMAND,
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self._on_message
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)
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)
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# Add /start command handler
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from telegram.ext import CommandHandler
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self._app.add_handler(CommandHandler("start", self._on_start))
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logger.info("Starting Telegram bot (polling mode)...")
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# Initialize and start polling
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await self._app.initialize()
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await self._app.start()
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# Get bot info
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bot_info = await self._app.bot.get_me()
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logger.info(f"Telegram bot @{bot_info.username} connected")
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# Start polling (this runs until stopped)
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await self._app.updater.start_polling(
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allowed_updates=["message"],
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drop_pending_updates=True # Ignore old messages on startup
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)
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# Keep running until stopped
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while self._running:
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await asyncio.sleep(1)
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async def stop(self) -> None:
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"""Stop the Telegram bot."""
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self._running = False
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if self._app:
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logger.info("Stopping Telegram bot...")
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await self._app.updater.stop()
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await self._app.stop()
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await self._app.shutdown()
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self._app = None
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async def send(self, msg: OutboundMessage) -> None:
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"""Send a message through Telegram."""
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if not self._app:
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logger.warning("Telegram bot not running")
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return
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try:
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# chat_id should be the Telegram chat ID (integer)
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chat_id = int(msg.chat_id)
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# Convert markdown to Telegram HTML
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html_content = _markdown_to_telegram_html(msg.content)
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await self._app.bot.send_message(
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chat_id=chat_id,
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text=html_content,
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parse_mode="HTML"
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)
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except ValueError:
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logger.error(f"Invalid chat_id: {msg.chat_id}")
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except Exception as e:
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# Fallback to plain text if HTML parsing fails
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logger.warning(f"HTML parse failed, falling back to plain text: {e}")
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try:
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await self._app.bot.send_message(
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chat_id=int(msg.chat_id),
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text=msg.content
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)
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except Exception as e2:
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logger.error(f"Error sending Telegram message: {e2}")
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async def _on_start(self, update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
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"""Handle /start command."""
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if not update.message or not update.effective_user:
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return
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user = update.effective_user
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await update.message.reply_text(
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f"👋 Hi {user.first_name}! I'm nanobot.\n\n"
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"Send me a message and I'll respond!"
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)
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async def _on_message(self, update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
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"""Handle incoming messages (text, photos, voice, documents)."""
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if not update.message or not update.effective_user:
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return
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message = update.message
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user = update.effective_user
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chat_id = message.chat_id
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# Use stable numeric ID, but keep username for allowlist compatibility
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sender_id = str(user.id)
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if user.username:
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sender_id = f"{sender_id}|{user.username}"
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# Store chat_id for replies
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self._chat_ids[sender_id] = chat_id
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# Build content from text and/or media
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content_parts = []
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media_paths = []
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# Text content
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if message.text:
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content_parts.append(message.text)
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if message.caption:
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content_parts.append(message.caption)
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# Handle media files
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media_file = None
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media_type = None
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if message.photo:
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media_file = message.photo[-1] # Largest photo
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media_type = "image"
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elif message.voice:
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media_file = message.voice
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media_type = "voice"
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elif message.audio:
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media_file = message.audio
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media_type = "audio"
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elif message.document:
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media_file = message.document
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media_type = "file"
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# Download media if present
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if media_file and self._app:
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try:
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file = await self._app.bot.get_file(media_file.file_id)
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ext = self._get_extension(media_type, getattr(media_file, 'mime_type', None))
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# Save to workspace/media/
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from pathlib import Path
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media_dir = Path.home() / ".nanobot" / "media"
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media_dir.mkdir(parents=True, exist_ok=True)
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file_path = media_dir / f"{media_file.file_id[:16]}{ext}"
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await file.download_to_drive(str(file_path))
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media_paths.append(str(file_path))
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# Handle voice transcription
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if media_type == "voice" or media_type == "audio":
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from nanobot.providers.transcription import GroqTranscriptionProvider
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transcriber = GroqTranscriptionProvider(api_key=self.groq_api_key)
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transcription = await transcriber.transcribe(file_path)
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if transcription:
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logger.info(f"Transcribed {media_type}: {transcription[:50]}...")
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content_parts.append(f"[transcription: {transcription}]")
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else:
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content_parts.append(f"[{media_type}: {file_path}]")
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else:
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content_parts.append(f"[{media_type}: {file_path}]")
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logger.debug(f"Downloaded {media_type} to {file_path}")
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except Exception as e:
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logger.error(f"Failed to download media: {e}")
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content_parts.append(f"[{media_type}: download failed]")
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content = "\n".join(content_parts) if content_parts else "[empty message]"
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logger.debug(f"Telegram message from {sender_id}: {content[:50]}...")
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# Forward to the message bus
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await self._handle_message(
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sender_id=sender_id,
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chat_id=str(chat_id),
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content=content,
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media=media_paths,
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metadata={
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"message_id": message.message_id,
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"user_id": user.id,
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"username": user.username,
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"first_name": user.first_name,
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"is_group": message.chat.type != "private"
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}
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)
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def _get_extension(self, media_type: str, mime_type: str | None) -> str:
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"""Get file extension based on media type."""
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if mime_type:
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ext_map = {
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"image/jpeg": ".jpg", "image/png": ".png", "image/gif": ".gif",
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"audio/ogg": ".ogg", "audio/mpeg": ".mp3", "audio/mp4": ".m4a",
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}
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if mime_type in ext_map:
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return ext_map[mime_type]
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type_map = {"image": ".jpg", "voice": ".ogg", "audio": ".mp3", "file": ""}
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return type_map.get(media_type, "")
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