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twilio_receiver.py
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twilio_receiver.py
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import logging
import re
import os
from twilio.rest import Client
from twilio.twiml.messaging_response import Message, MessagingResponse
from twilio.request_validator import RequestValidator
import sys
import urllib
sys.path.append('./package')
class TwilioReceiver:
def __init__(self, twilio_lambda_event = {}, logger = logging.getLogger()):
self.client = Client(os.environ.get('TWILIO_ACCOUNT_SID'), os.environ.get('TWILIO_AUTH_TOKEN'))
self.twilio_number = os.environ.get('TWILIO_NUMBER')
self.admin_numbers = [x.encode('utf8') for x in os.environ['ADMIN_NUMBERS'].split(',')]
self.logger = logger
self.event = {}
self.twilio_signature = ''
self.parse_event(twilio_lambda_event)
self.validator = RequestValidator(os.environ.get('TWILIO_AUTH_TOKEN'))
def message(self):
return self.event.get(u'Body', '')
def sender(self):
return self.event.get(u'From', '')
def ip(self):
try:
return re.split(r'whitelist\sadd|remove\s', self.message())[-1].strip().split(' as ')[0]
except IndexError:
return ''
def ip_description(self):
try:
return re.split(r'whitelist\sadd|remove\s', self.message())[-1].strip().split(' as ')[1]
except IndexError:
return ''
def parse_event(self, event):
try:
self.twilio_signature = event[u'twilioSignature']
self.event = {
k: urllib.parse.unquote_plus(v) for k, v in event.items() if k != u'twilioSignature'
}
except KeyError as key_error:
self.logger.error(f'Twilio event is missing key: {key_error}')
self.twilio_signature = ''
self.event = {}
def valid_request(self):
return self.validator.validate(
os.environ['REQUEST_URL'],
self.event,
self.twilio_signature
)
def requester_is_an_admin(self):
return (u'From' in self.event and self.event[u'From'].encode('utf8') in self.admin_numbers)
def validate(self):
return self.valid_request() and self.requester_is_an_admin()
def send_sms(self, phone_number, message):
twilio_message = self.client.messages.create(
body=message,
from_=self.twilio_number,
to=phone_number
)
self.logger.info(f'Sent SMS: {message}')
return message