Check for remote file changes

check-remote-file-change.py

#!/usr/bin/env python

"""This script checks the Last-Modified header of a remote file.
It will use Growl to notify the user, when the field differs from a specified comparison time.
"""

__author__ = 'Jan Beilicke'
__date__ = '2011-07-24'

import sys
import httplib
import urllib2
import Growl


if __name__ == '__main__':
    filename = 'lightning.xpi'
    check_uri = 'http://ftp.mozilla.org/pub/mozilla.org/calendar/lightning/nightly/latest-comm-miramar/macosx-xpi/%s' % filename
    compare_to = 'Sat, 02 Jul 2011 09:57:09 GMT'

    print 'Checking URL: %s' % check_uri

    growl_appname = 'Check remote file'    
    growl_notifications = ['Updated', 'Error']
    growl = Growl.GrowlNotifier(growl_appname, growl_notifications)
    growl.register()
    
    request = urllib2.Request(check_uri)
    opener = urllib2.build_opener()
    try:
        request.add_header('If-Modified-Since', compare_to)
        data = opener.open(request)
    except urllib2.HTTPError, e:
        print('%s - %s' % (e.msg, e.code))
        sys.exit()
    except urllib2.URLError, e:
        print(e.reason)
        growl.notify('Error', 'Moz-Update-Check', str(e.reason), sticky=True)
        sys.exit()
    
    print('File has been updated!')
    growl.notify('Updated', 'Moz-Update-Check', '%s has been updated!' % filename, sticky=True)