text: # Copyright 2015 Google Inc. All Rights Reserved.
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  # [START app]
  import os
  
  from flask import Flask, request
  from twilio import twiml
  from twilio.rest import TwilioRestClient
  
  
  # [START configuration]
  TWILIO_ACCOUNT_SID = os.environ['TWILIO_ACCOUNT_SID']
  TWILIO_AUTH_TOKEN = os.environ['TWILIO_AUTH_TOKEN']
  TWILIO_NUMBER = os.environ['TWILIO_NUMBER']
  # [END configuration]
  
  
  app = Flask(__name__)
  
  
  # [START receive_call]
  @app.route('/call/receive', methods=['POST'])
  def receive_call():
      """Answers a call and replies with a simple greeting."""
      response = twiml.Response()
      response.say('Hello from Twilio!')
      return str(response), 200, {'Content-Type': 'application/xml'}
  # [END receive_call]
  
  
  # [START send_sms]
  @app.route('/sms/send')
  def send_sms():
      """Sends a simple SMS message."""
      to = request.args.get('to')
      if not to:
          return ('Please provide the number to message in the "to" query string'
                  ' parameter.')
  
      client = TwilioRestClient(TWILIO_ACCOUNT_SID, TWILIO_AUTH_TOKEN)
      rv = client.messages.create(
          to=to,
          from_=TWILIO_NUMBER,
          body='Hello from Twilio!')
      return str(rv)
  # [END send_sms]
  
  
  # [START receive_sms]
  @app.route('/sms/receive', methods=['POST'])
  def receive_sms():
      """Receives an SMS message and replies with a simple greeting."""
      sender = request.values.get('From')
      body = request.values.get('Body')
  
      message = 'Hello, {}, you said: {}'.format(sender, body)
  
      response = twiml.Response()
      response.message(message)
      return str(response), 200, {'Content-Type': 'application/xml'}
  # [END receive_sms]
  
  
  if __name__ == '__main__':
      # This is used when running locally. Gunicorn is used to run the
      # application on Google App Engine. See entrypoint in app.yaml.
      app.run(host='127.0.0.1', port=8080, debug=True)
  # [END app]
  