Pythonista script to trigger different Launch Center Pro actions based on internet availability

LCP Action Router.py

# Pythonista script to trigger different Launch Center Pro
# actions based on internet availability
# Author: Aaron Bach
# www: http://www.bachyaproductions.com/

import json
import re
import socket
import sys
import urllib
import webbrowser

def internet_reachable():
    """
    Determines internet availability by opening a socket
    to google.com (hopefully that domain name never goes
    away).
    """
    sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    try:
        sock.connect(('google.com', 80))
        good_connection = True
    except (OSError, Exception) as e:
        good_connection = False

    sock.close()
    return good_connection

def quote_url_parameters(match):
    """
    Takes a key=value URL argument and encodes the value portion.

    By unquoting then requoting the URL, the script can accommodate
    scenarious where:
        1. URLs come in unencoded
        2. URLs come in encoded
        3. URLs come in with a mixture of encoding
    """
    return '=' + urllib.quote(urllib.unquote(match.group(1)), '')

def main():
    """
    Main program.

    RE: passing arguments to this script: LCP requires Pythonista arguments
    to be surrounded by double quotes. Since we're using JSON loading (in
    my opinion, the safest method of turning a dict string into an actual
    dict), we also have to grapple with the fact the JSON parser requires
    double quotes around arguments. Thus, the following string replacement
    occurs:
    """
    urls = json.loads(sys.argv[1].replace("'", '"'))
    args = json.loads(sys.argv[2].replace("'", '"'))

    try:
        on_url = re.sub('=([^&]+)', quote_url_parameters, urls['URL On'].format(**args))
    except KeyError, e:
        print 'Missing argument or invalid URL token in "On" URL: ' + str(e)
        return

    try:
        off_url = re.sub('=([^&]+)', quote_url_parameters, urls['URL Off'].format(**args))
    except KeyError, e:
        print 'Missing argument or invalid URL token in "Off" URL: ' + str(e)
        return

    webbrowser.open(on_url if internet_reachable() else off_url)

if __name__ == '__main__':
    main()