Add support for Twilio #42
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,78 @@ | ||
| """Handler for Twilio webhook validation and incoming call TwiML generation.""" | ||
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| import hashlib | ||
| import hmac | ||
| import logging | ||
| import time | ||
| from urllib.parse import urlparse, urlunparse | ||
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| from twilio.request_validator import RequestValidator | ||
| from twilio.twiml.voice_response import VoiceResponse | ||
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| logger = logging.getLogger(__name__) | ||
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| # Token validity period in seconds | ||
| _TOKEN_TTL = 60 | ||
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| class TwilioEventHandler: | ||
| """Validates Twilio webhook signatures and generates TwiML responses.""" | ||
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| def __init__(self, config): | ||
| self.auth_token = config.get("TWILIO_AUTH_TOKEN", "") | ||
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| def _reconstruct_url(self, raw_url: str) -> str: | ||
| """Reconstruct URL as Twilio sees it (https, no port for voice HTTPS).""" | ||
| parsed = urlparse(raw_url) | ||
| return urlunparse(("https", parsed.hostname, parsed.path, parsed.params, parsed.query, "")) | ||
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| def _generate_ws_token(self) -> str: | ||
| """Generate a short-lived HMAC token for WebSocket authentication.""" | ||
| timestamp = str(int(time.time())) | ||
| sig = hmac.new( | ||
| self.auth_token.encode(), timestamp.encode(), hashlib.sha256 | ||
| ).hexdigest() | ||
| return f"{timestamp}.{sig}" | ||
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| def verify_ws_token(self, token: str) -> bool: | ||
| """Verify a WebSocket token is valid and not expired.""" | ||
| if not self.auth_token or not token: | ||
| return False | ||
| parts = token.split(".", 1) | ||
| if len(parts) != 2: | ||
| return False | ||
| timestamp_str, sig = parts | ||
| try: | ||
| timestamp = int(timestamp_str) | ||
| except ValueError: | ||
| return False | ||
| # Check expiry | ||
| if time.time() - timestamp > _TOKEN_TTL: | ||
| return False | ||
| # Verify signature | ||
| expected = hmac.new( | ||
| self.auth_token.encode(), timestamp_str.encode(), hashlib.sha256 | ||
| ).hexdigest() | ||
| return hmac.compare_digest(sig, expected) | ||
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| def validate_request(self, url: str, params: dict, signature: str) -> bool: | ||
| """Validate a Twilio HTTP webhook request signature. | ||
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| Returns True if valid, False if invalid, None if auth token not configured. | ||
| """ | ||
| if not self.auth_token: | ||
| return None | ||
| validator = RequestValidator(self.auth_token) | ||
| reconstructed_url = self._reconstruct_url(url) | ||
| return validator.validate(reconstructed_url, params, signature) | ||
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| def generate_stream_twiml(self, ws_url: str) -> str: | ||
| """Generate TwiML response that connects the call to a media stream with auth token.""" | ||
| token = self._generate_ws_token() | ||
| resp = VoiceResponse() | ||
| resp.say("Please wait while we connect you to our AI assistant.") | ||
| connect = resp.connect() | ||
| stream = connect.stream(url=ws_url) | ||
| stream.parameter(name="token", value=token) | ||
| logger.info("Returning TwiML with stream URL: %s", ws_url) | ||
| return str(resp) |
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