"""SMS (Twilio) platform adapter. Connects to the Twilio REST API for outbound SMS and runs an aiohttp webhook server to receive inbound messages. Shares credentials with the optional telephony skill — same env vars: - TWILIO_ACCOUNT_SID - TWILIO_AUTH_TOKEN - TWILIO_PHONE_NUMBER (E.164 from-number, e.g. +15551234567) Gateway-specific env vars: - SMS_WEBHOOK_PORT (default 8080) - SMS_ALLOWED_USERS (comma-separated E.164 phone numbers) - SMS_ALLOW_ALL_USERS (true/false) - SMS_HOME_CHANNEL (phone number for cron delivery) """ import asyncio import base64 import json import logging import os import re import urllib.parse from typing import Any, Dict, List, Optional from gateway.config import Platform, PlatformConfig from gateway.platforms.base import ( BasePlatformAdapter, MessageEvent, MessageType, SendResult, ) logger = logging.getLogger(__name__) TWILIO_API_BASE = "https://api.twilio.com/2010-04-01/Accounts" MAX_SMS_LENGTH = 1600 # ~10 SMS segments DEFAULT_WEBHOOK_PORT = 8080 # E.164 phone number pattern for redaction _PHONE_RE = re.compile(r"\+[1-9]\d{6,14}") def _redact_phone(phone: str) -> str: """Redact a phone number for logging: +15551234567 -> +1555***4567.""" if not phone: return "" if len(phone) <= 8: return phone[:2] + "***" + phone[-2:] if len(phone) > 4 else "****" return phone[:5] + "***" + phone[-4:] def check_sms_requirements() -> bool: """Check if SMS adapter dependencies are available.""" try: import aiohttp # noqa: F401 except ImportError: return False return bool(os.getenv("TWILIO_ACCOUNT_SID") and os.getenv("TWILIO_AUTH_TOKEN")) class SmsAdapter(BasePlatformAdapter): """ Twilio SMS <-> Hermes gateway adapter. Each inbound phone number gets its own Hermes session (multi-tenant). Replies are always sent from the configured TWILIO_PHONE_NUMBER. """ MAX_MESSAGE_LENGTH = MAX_SMS_LENGTH def __init__(self, config: PlatformConfig): super().__init__(config, Platform.SMS) self._account_sid: str = os.environ["TWILIO_ACCOUNT_SID"] self._auth_token: str = os.environ["TWILIO_AUTH_TOKEN"] self._from_number: str = os.getenv("TWILIO_PHONE_NUMBER", "") self._webhook_port: int = int( os.getenv("SMS_WEBHOOK_PORT", str(DEFAULT_WEBHOOK_PORT)) ) self._runner = None self._http_session: Optional["aiohttp.ClientSession"] = None def _basic_auth_header(self) -> str: """Build HTTP Basic auth header value for Twilio.""" creds = f"{self._account_sid}:{self._auth_token}" encoded = base64.b64encode(creds.encode("ascii")).decode("ascii") return f"Basic {encoded}" # ------------------------------------------------------------------ # Required abstract methods # ------------------------------------------------------------------ async def connect(self) -> bool: import aiohttp from aiohttp import web if not self._from_number: logger.error("[sms] TWILIO_PHONE_NUMBER not set — cannot send replies") return False app = web.Application() app.router.add_post("/webhooks/twilio", self._handle_webhook) app.router.add_get("/health", lambda _: web.Response(text="ok")) self._runner = web.AppRunner(app) await self._runner.setup() site = web.TCPSite(self._runner, "0.0.0.0", self._webhook_port) await site.start() self._http_session = aiohttp.ClientSession() self._running = True logger.info( "[sms] Twilio webhook server listening on port %d, from: %s", self._webhook_port, _redact_phone(self._from_number), ) return True async def disconnect(self) -> None: if self._http_session: await self._http_session.close() self._http_session = None if self._runner: await self._runner.cleanup() self._runner = None self._running = False logger.info("[sms] Disconnected") async def send( self, chat_id: str, content: str, reply_to: Optional[str] = None, metadata: Optional[Dict[str, Any]] = None, ) -> SendResult: import aiohttp formatted = self.format_message(content) chunks = self.truncate_message(formatted) last_result = SendResult(success=True) url = f"{TWILIO_API_BASE}/{self._account_sid}/Messages.json" headers = { "Authorization": self._basic_auth_header(), } session = self._http_session or aiohttp.ClientSession() try: for chunk in chunks: form_data = aiohttp.FormData() form_data.add_field("From", self._from_number) form_data.add_field("To", chat_id) form_data.add_field("Body", chunk) try: async with session.post(url, data=form_data, headers=headers) as resp: body = await resp.json() if resp.status >= 400: error_msg = body.get("message", str(body)) logger.error( "[sms] send failed to %s: %s %s", _redact_phone(chat_id), resp.status, error_msg, ) return SendResult( success=False, error=f"Twilio {resp.status}: {error_msg}", ) msg_sid = body.get("sid", "") last_result = SendResult(success=True, message_id=msg_sid) except Exception as e: logger.error("[sms] send error to %s: %s", _redact_phone(chat_id), e) return SendResult(success=False, error=str(e)) finally: # Close session only if we created a fallback (no persistent session) if not self._http_session and session: await session.close() return last_result async def get_chat_info(self, chat_id: str) -> Dict[str, Any]: return {"name": chat_id, "type": "dm"} # ------------------------------------------------------------------ # SMS-specific formatting # ------------------------------------------------------------------ def format_message(self, content: str) -> str: """Strip markdown — SMS renders it as literal characters.""" content = re.sub(r"\*\*(.+?)\*\*", r"\1", content, flags=re.DOTALL) content = re.sub(r"\*(.+?)\*", r"\1", content, flags=re.DOTALL) content = re.sub(r"__(.+?)__", r"\1", content, flags=re.DOTALL) content = re.sub(r"_(.+?)_", r"\1", content, flags=re.DOTALL) content = re.sub(r"```[a-z]*\n?", "", content) content = re.sub(r"`(.+?)`", r"\1", content) content = re.sub(r"^#{1,6}\s+", "", content, flags=re.MULTILINE) content = re.sub(r"\[([^\]]+)\]\([^\)]+\)", r"\1", content) content = re.sub(r"\n{3,}", "\n\n", content) return content.strip() # ------------------------------------------------------------------ # Twilio webhook handler # ------------------------------------------------------------------ async def _handle_webhook(self, request) -> "aiohttp.web.Response": from aiohttp import web try: raw = await request.read() # Twilio sends form-encoded data, not JSON form = urllib.parse.parse_qs(raw.decode("utf-8")) except Exception as e: logger.error("[sms] webhook parse error: %s", e) return web.Response( text='', content_type="application/xml", status=400, ) # Extract fields (parse_qs returns lists) from_number = (form.get("From", [""]))[0].strip() to_number = (form.get("To", [""]))[0].strip() text = (form.get("Body", [""]))[0].strip() message_sid = (form.get("MessageSid", [""]))[0].strip() if not from_number or not text: return web.Response( text='', content_type="application/xml", ) # Ignore messages from our own number (echo prevention) if from_number == self._from_number: logger.debug("[sms] ignoring echo from own number %s", _redact_phone(from_number)) return web.Response( text='', content_type="application/xml", ) logger.info( "[sms] inbound from %s -> %s: %s", _redact_phone(from_number), _redact_phone(to_number), text[:80], ) source = self.build_source( chat_id=from_number, chat_name=from_number, chat_type="dm", user_id=from_number, user_name=from_number, ) event = MessageEvent( text=text, message_type=MessageType.TEXT, source=source, raw_message=form, message_id=message_sid, ) # Non-blocking: Twilio expects a fast response asyncio.create_task(self.handle_message(event)) # Return empty TwiML — we send replies via the REST API, not inline TwiML return web.Response( text='', content_type="application/xml", )