Parsing the entity type, entity value and intent from the api.ai webhook request

app.py

# -*- coding:utf8 -*-
# !/usr/bin/env python
# Copyright 2017 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.

from __future__ import print_function
from future.standard_library import install_aliases
install_aliases()

from urllib.parse import urlparse, urlencode
from urllib.request import urlopen, Request
from urllib.error import HTTPError

import json
import os

from flask import Flask
from flask import request
from flask import make_response

# Flask app should start in global layout
app = Flask(__name__)


@app.route('/webhook', methods=['POST'])
def webhook():
    req = request.get_json(silent=True, force=True)
    print("Request:")
    print(json.dumps(req, indent=4))

    res = processRequest(req)

    res = json.dumps(res, indent=4)
    print(res)
    r = make_response(res)
    r.headers['Content-Type'] = 'application/json'
    return r


def processRequest(req):
    # Parsing the POST request body into a dictionary for easy access. 
    req_dict = json.loads(request.data)
    entity_type = ""
    entity_value = ""
    # Accessing the fields on the POST request boduy of API.ai invocation of the webhook
    intent = req_dict["result"]["metadata"]["intentName"]

    entity_key_val = req_dict["result"]["parameters"]
    for key in entity_key_val:
	    entity_value = entity_key_val[key]
	    entity_type = key 
    
    # constructing the resposne string.
    speech = "Hey, Got your request, Responding from webhook " + "The Intent is: " + intent + ": The entity type is: " + entity_type + ": The entity value is: " + entity_value  
    res = makeWebhookResult(speech)
    return res


def makeWebhookResult(speech):
    print("Response:")
    print(speech)

    return {
        "speech": speech,
        "displayText": speech,
        "source": "Build conversational interface for your app in 10 minutes."
    }


if __name__ == '__main__':
    port = int(os.getenv('PORT', 5000))

    print("Starting app on port %d" % port)

    app.run(debug=False, port=port, host='0.0.0.0', threaded=True)