ex_13_6_exam2_GeoJSON.py

'''
Calling a JSON API

In this assignment you will write a Python program somewhat similar to
http://www.py4e.com/code3/geojson.py.
The program will prompt for a location, contact a web service and retrieve JSON
for the web service and parse that data, and retrieve the first place_id from the JSON.
A place ID is a textual identifier that uniquely identifies a place as within Google Maps.

API End Points

To complete this assignment, you should use this API endpoint that has a static subset
of the Google Data:     http://py4e-data.dr-chuck.net/json?
This API uses the same parameter (address) as the Google API.
This API also has no rate limit so you can test as often as you like.
If you visit the URL with no parameters, you get "No address..." response.
To call the API, you need to include a key= parameter and provide the address that
you are requesting as the address= parameter that is properly URL encoded using
the urllib.parse.urlencode() function as shown in http://www.py4e.com/code3/geojson.py

Make sure to check that your code is using the API endpoint is as shown above.
You will get different results from the geojson and json endpoints so make sure
you are using the same end point as this autograder is using.
'''
import urllib.request, urllib.parse, urllib.error
import json
import ssl

api_key = False
# If you have a Google Places API key, enter it here
# api_key = 'AIzaSy___IDByT70'
# https://developers.google.com/maps/documentation/geocoding/intro

if api_key is False:
    api_key = 42
    serviceurl = 'http://py4e-data.dr-chuck.net/json?'
else :
    serviceurl = 'https://maps.googleapis.com/maps/api/geocode/json?'

# Ignore SSL certificate errors
ctx = ssl.create_default_context()
ctx.check_hostname = False
ctx.verify_mode = ssl.CERT_NONE

while True:
    address = input('Enter location: ') #The program takes the search string and constructs a URL
    if len(address) < 1: break

    parms = dict() #with the search string as a properly encoded parameter and then uses urllib
    parms['address'] = address #to retrieve the text from the Google geocoding API.
    if api_key is not False: parms['key'] = api_key
    url = serviceurl + urllib.parse.urlencode(parms)

    print('Retrieving', url)
    uh = urllib.request.urlopen(url, context=ctx)
    data = uh.read().decode()
    print('Retrieved', len(data), 'characters')
    #print(data) #print check

    try:
        js = json.loads(data)
    except:
        js = None

    if not js or 'status' not in js or js['status'] != 'OK':
        print('==== Failure To Retrieve ====')
        continue

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

    lat = js['results'][0]["place_id"]
    print('The Google ID of ', address, ' is: ', lat)
'''
Test Data / Sample Execution

You can test to see if your program is working with a location of
"South Federal University" which will have a
place_id of "ChIJ0V94rPl_bIcR6KyIGL16ZQA".

$ python3 solution.py
Enter location: South Federal University
Retrieving http://...
Retrieved 2458 characters
Place id ChIJ0V94rPl_bIcR6KyIGL16ZQA
Turn In

Please run your program to find the place_id for this location:

Weizmann Institute of Science

Make sure to enter the name and case exactly as above and enter the place_id
and your Python code below. Hint: The first seven characters of the
place_id are "ChIJnSq ..."
Make sure to retreive the data from the URL specified above and not the normal Google API.
Your program should work with the Google API - but the place_id may not match for this assignment.

'''