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#!/usr/bin/env python
 
# google-voice-dialout.agi
# Paul Marks (http://pmarks.net)
#
# This is an Asterisk 1.6 script to place outgoing calls through Google Voice.
# It will automatically sign into the web interface, and submit a click2call
# request through your registered Gizmo number.  Asterisk can then answer
# the incoming call, and Bridge() it into your original outgoing call.
#
# I deduced the click2call sequence by using the "Live HTTP Headers" Firefox
# plugin.  If the website changes too much, this script will probably stop
# working, so don't use it for anything too important.
#
# This assumes you've already configured Asterisk to receive Gizmo calls.
#
#
# This rule will redirect outbound calls to this script:
#   exten => _1NXXNXXXXXX,1,AGI(google-voice-dialout.agi)
#
# This rule will connect the inbound GV/Gizmo calls:
#   exten => s/6502650000,1,Bridge(${DB_DELETE(gv_dialout/channel)}, p)
#              ^-- Put your 10-digit Google Voice number here.
#
#
# To test this script from the command line without Asterisk, type the
# following.  Be sure to type a few linefeeds at the end:
#
#   $ ./google-voice-dialout.agi
#   agi_channel:
#   agi_dnid: 18004664411
#
 
# Put your Google login and Gizmo number here:
USERNAME = "username@gmail.com"
PASSWORD = "password"
GIZMO_NUMBER = "17475555555"
 
import httplib
import urllib
import re
import sys
import time
 
class Error(Exception):
    pass
 
def ReadAgiEnvironment():
    env = {}
    while 1:
        line = sys.stdin.readline().strip()
        if not line:
            break
        key, data = line.split(':')
        env[key.strip()] = data.strip()
    return env
 
def SendAgi(cmd):
    sys.stdout.write("%s\n" % cmd)
    sys.stdout.flush()
    sys.stdin.readline()
 
class SimpleCookieJar(object):
    cookie_re = re.compile(r"(?i)set-cookie: (\w+)=([^;]+).*")
    def __init__(self):
        self.cookies = {}
    def addCookies(self, response):
        for header in response.msg.headers:
            m = self.cookie_re.match(header)
            if not m:
                continue
            self.cookies[m.group(1)] = m.group(2)
    def get(self):
        return "; ".join("%s=%s" % kv for kv in self.cookies.iteritems())
 
class GVClickToCall(object):
    USER_AGENT = "google-voice-dialout.agi/1.1"
 
    def __init__(self, username, password, via, dial):
        self.username = username
        self.password = password
        self.via = via
        self.dial = dial
        self.cj = SimpleCookieJar()
        self.h = httplib.HTTPSConnection("www.google.com")
        self.login()
        self.placeCall()
        self.logout()
 
    def login(self):
        print >>sys.stderr, "Logging in."
        postdata = urllib.urlencode({ "Email": self.username,
                                      "Passwd": self.password })
        self.doRequest(
            method="POST", url="/accounts/ServiceLoginAuth",
            body=postdata,
            headers={ "Content-Type": "application/x-www-form-urlencoded" })
 
        # Start at https://www.google.com/voice, and collect cookies as we
        # follow all the redirects.
        PREFIX = "https://www.google.com/"
        location = "/voice"
        for i in xrange(5):
            response, html = self.doRequest(
                method="GET", url=location,
                headers={})
 
            location = response.getheader("location")
            if not location:
                # No more redirects, yay!
                break
 
            # All redirects should fall within the same domain.
            if not location.startswith(PREFIX):
                raise Error("Unexpected redirect: %s" % location)
            location = location[len(PREFIX)-1:]
 
        # Scrape magic _rnr_se value from the HTML.
        m = re.search(r'name="_rnr_se" type="hidden" value="([^"]+)"', html)
        if not m:
            raise Error("Can't find _rnr_se.  Not logged in?")
        self.magic_rnr_se = m.group(1)
 
    def placeCall(self):
        print >>sys.stderr, "Calling %s via %s" % (self.dial, self.via)
        postdata = urllib.urlencode({ "outgoingNumber": self.dial,
                                      "forwardingNumber": self.via,
                                      "_rnr_se": self.magic_rnr_se })
        response, http = self.doRequest(
            method="POST", url="/voice/call/connect",
            body=postdata,
            headers={ "Content-Type": "application/x-www-form-urlencoded" })
        print >>sys.stderr, "Dial response:", http
 
    def logout(self):
        self.doRequest(
            method="GET", url="/accounts/Logout",
            headers={ "Connection": "close" })
        print >>sys.stderr, "Logged out."
 
    def doRequest(self, headers, **kw):
        headers["User-agent"] = self.USER_AGENT
        headers["Cookie"] = self.cj.get()
        self.h.request(headers=headers, **kw)
        response = self.h.getresponse()
        self.cj.addCookies(response)
        return response, response.read()
 
def main():
    env = ReadAgiEnvironment()
    print >>sys.stderr, env
 
    agi_channel = env["agi_channel"]
    agi_dnid = env["agi_dnid"]
 
    # Write the channel ID to Asterisk's database, so it can be accessed
    # by the incoming call when it arrives.
    SendAgi("database put gv_dialout channel %s" % agi_channel)
 
    SendAgi("answer")
    try:
        GVClickToCall(username=USERNAME, password=PASSWORD,
                      dial=agi_dnid, via=GIZMO_NUMBER)
 
        # Asterisk should patch in the incoming call while we're asleep.
        time.sleep(10)
    finally:
        SendAgi("hangup")
 
if __name__ == '__main__':
    main()