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:")
    # commented out by Naresh
    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):
    print ("starting processRequest...",req.get("result").get("action"))
    if req.get("result").get("action") != "yahooWeatherForecast":
        return {}
    baseurl = "https://query.yahooapis.com/v1/public/yql?"
    yql_query = makeYqlQuery(req)
    if yql_query is None:
        return {}
    yql_url = baseurl + urlencode({'q': yql_query}) + "&format=json"
    result = urlopen(yql_url).read()
    #data = json.loads(result)
    #for some the line above gives an error and hence decoding to utf-8 might help
    data = json.loads(result.decode('utf-8'))
    res = makeWebhookResult(data)
    return res


def makeYqlQuery(req):
    result = req.get("result")
    parameters = result.get("parameters")
    city = parameters.get("geo-city")
    if city is None:
        return None
    return "select * from weather.forecast where woeid in (select woeid from geo.places(1) where text='" + city + "')"


def makeWebhookResult(data):
    print ("starting makeWebhookResult...")
    query = data.get('query')
    if query is None:
        return {}

    result = query.get('results')
    if result is None:
        return {}

    channel = result.get('channel')
    if channel is None:
        return {}

    item = channel.get('item')
    location = channel.get('location')
    units = channel.get('units')
    if (location is None) or (item is None) or (units is None):
        return {}

    condition = item.get('condition')
    if condition is None:
        return {}

    # print(json.dumps(item, indent=4))

    speech = "Today the weather in " + location.get('city') + ": " + condition.get('text') + \
             ", And the temperature is " + condition.get('temp') + " " + units.get('temperature')

    print("Response:")
    print(speech)

    return {
        "speech": speech,
        "displayText": speech,
        # "data": data,
        # "contextOut": [],
        "source": "apiai-weather-webhook-sample"
    }


@app.route('/test', methods=['GET'])
def test():
    return  "Hello there my friend !!"


@app.route('/static_reply', methods=['POST'])
def static_reply():
    speech = "Hello there, this reply is from the webhook !! "
    my_result =  {
        "speech": speech,
        "displayText": speech,
        # "data": data,
        # "contextOut": [],
        "source": "apiai-weather-webhook-sample"
    }
    res = json.dumps(my_result, indent=4)
    r = make_response(res)
    r.headers['Content-Type'] = 'application/json'
    return r



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

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

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