urlinfo

#!/usr/bin/env python2
#emacs: -*- mode: python; py-indent-offset: 4; tab-width: 4; indent-tabs-mode: nil -*- 
#ex: set sts=4 ts=4 sw=4 noet:
#------------------------- =+- Python script -+= -------------------------
"""
  Yaroslav Halchenko                                            Dartmouth
  web:     http://www.onerussian.com                              College
  e-mail:  yoh@onerussian.com                              ICQ#: 60653192

 DESCRIPTION (NOTES):

 COPYRIGHT: Yaroslav Halchenko 2013

 LICENSE: MIT

  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:

  The above copyright notice and this permission notice shall be included in
  all copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  THE SOFTWARE.
"""
#-----------------\____________________________________/------------------

__author__ = 'Yaroslav Halchenko'
__copyright__ = 'Copyright (c) 2013 Yaroslav Halchenko'
__license__ = 'MIT'

import argparse
import re, os, sys, urllib2

from urlparse import urlsplit

def main(cmdline=None):
    args = make_parser().parse_args(cmdline)

    for url in args.urls:
        if args.print_filename:
            print(get_filename(url))
        else:
            response = get_url(url)
            # by default just dump all the information
            print("URL: ", url)
            if url != response.url:
                print("REDIRECTED URL: ", response.url)
            print(response.info())

def make_parser():
    parser = argparse.ArgumentParser('%prog: little tool to help gather information about URL(s)')
    parser.add_argument('urls', nargs='*', help='URLs')
    parser.add_argument('-f', '--print-filename', action='store_true',
                        help='just print a content-disposition filename if present.'
                             ' Otherwise the trailing portion of the URL')
    return parser

def get_filename(url):
    response = get_url(url)
    info = response.info()
    if info.has_key('Content-Disposition'):
        res = re.match('.* filename="(.*)"', info['Content-Disposition'])
        return res.groups()[0]
    else:
        return os.path.basename(urllib2.unquote(urlsplit(response.url).path))

def test_get_filename():
    assert(get_filename('http://human.brain-map.org/api/v2/well_known_file_download/157722290') == 'T1.nii.gz')
    assert(get_filename('https://raw.githubusercontent.com/datalad/datalad/master/README.md') == 'README.md')


def get_url(url):
    request = urllib2.Request(url)
    request.add_header('Accept-encoding', 'gzip,deflate')
    response = urllib2.urlopen(request)
    return response

if __name__ == '__main__':
    # for some reason nose refused to load tests even with --exe
    # test_get_filename()
    sys.exit(main())