Basic concept for querying for Google Chrome updates based on current Chrome version/OS/arch

google_chrome_update_checker.py

#!/usr/bin/python

import xml.etree.ElementTree as ET
import requests
import uuid

params = {'cup2hreq': 'foo', 'cup2key': 'bar'}

platform = 'mac'
os_version = '10.12'

xml = """
<request protocol="3.0" requestid="{%s}"> 
        <os platform="%s" version="%s" />
        <app appid="com.google.Chrome" lang="en-us">
                <updatecheck />
        </app>
</request>
""" % (str(uuid.uuid1()), platform, os_version)

r = requests.post('https://tools.google.com/service/update2', params=params, data=xml)

root = ET.fromstring(r.text)

dmg_url_list = []

for tag in root.iter('url'):
    print tag.attrib['codebase']
    dmg_url_list.append(tag.attrib['codebase'])
    break

for tag in root.iter('package'):
    print tag.attrib['name']
    dmg_url_list.append(tag.attrib['name'])

dmg_url = ''.join(dmg_url_list)    
print dmg_url