[Baypiggies] urllib2, basic HTTP authentication, and tr.im

[Benjamin Sergeant]

Warning: quick and dirty solution with no error checking using curl and a
unix pipe.

- Benjamin

[bsergean at localhost bin]$ cat trim.py
#!/usr/bin/env python

import os, sys
from getpass import getpass
import xml.dom.minidom

if len(sys.argv) != 2:
    print 'Usage: trim.py <url to shorten>'
    sys.exit(0)

user = raw_input('username: ')
passwd = getpass('password: ')

# See http://tr.im/api
url = 'http://api.tr.im/api/trim_url.xml?url=%s&newtrim=yes' % sys.argv[1]

# Warning: --silent don't show error messages
cmd  = 'curl --silent --basic -u %s:%s ' % (user, passwd)
cmd += url

fd = os.popen(cmd, 'r')
response = fd.read()
print response
fd.close()

Doc = xml.dom.minidom.parseString(response)
N = Doc.getElementsByTagName("url")
shortened_url = str((N[0].childNodes)[0].data)

print 'shortened url:', shortened_url


[bsergean at localhost bin]$ python trim.py
Usage: trim.py <url to shorten>
[bsergean at localhost bin]$ python trim.py
http://www.reddit.com/r/programming/
username: bsergean
password:
<?xml version="1.0" encoding="UTF-8"?>
<trim>
  <status result="OK" code="200" message="tr.im URL Added."/>
  <url>http://tr.im/hglC</url>
  <reference>ZfCAq7qcyouYXwfR2WsuBR6v3V4q7L</reference>
  <trimpath>hglC</trimpath>
</trim>

shortened url: http://tr.im/hglC






On Tue, Mar 10, 2009 at 11:51 PM, Shannon -jj Behrens <jjinux at gmail.com>wrote:

> It may help to look at what is being sent over the wire.
>
> -jj
>
> On Tue, Mar 10, 2009 at 8:26 AM, Daryl Spitzer <daryl.spitzer at gmail.com>
> wrote:
> > I'm playing around, trying to write some code to use the http://tr.im
> > APIs (http://tr.im/api/) to shorten a URL.
> >
> > After reading http://docs.python.org/library/urllib2.html, I tried:
> >
> >    TRIM_API_URL = 'http://api.tr.im/api'
> >    auth_handler = urllib2.HTTPBasicAuthHandler()
> >    auth_handler.add_password(realm='tr.im',
> >                              uri=TRIM_API_URL,
> >                              user=USERNAME,
> >                              passwd=PASSWORD)
> >    opener = urllib2.build_opener(auth_handler)
> >    urllib2.install_opener(opener)
> >    response = urllib2.urlopen('%s/trim_simple?url=%s'
> >                               % (TRIM_API_URL, url_to_trim))
> >    url = response.read().strip()
> >
> > response.code is 200 (I think it should be 202).  url is valid, but
> > the basic HTTP authentication doesn't seem to have worked, because the
> > shortened URL isn't in my list of URLs (at http://tr.im/?page=1).
> >
> > After reading
> http://www.voidspace.org.uk/python/articles/authentication.shtml#doing-it-properly
> > I also tried:
> >
> >    TRIM_API_URL = 'api.tr.im/api'
> >    password_mgr = urllib2.HTTPPasswordMgrWithDefaultRealm()
> >    password_mgr.add_password(None, TRIM_API_URL, USERNAME, PASSWORD)
> >    auth_handler = urllib2.HTTPBasicAuthHandler(password_mgr)
> >    opener = urllib2.build_opener(auth_handler)
> >    urllib2.install_opener(opener)
> >    response = urllib2.urlopen('http://%s/trim_simple?url=%s'
> >                               % (TRIM_API_URL, url_to_trim))
> >    url = response.read().strip()
> >
> > But I get the same results.  (response.code is 200 and url is valid,
> > but not recorded in my account at http://tr.im/.)
> >
> > If I use query string parameters instead of basic HTTP authentication,
> > like this:
> >
> >    TRIM_API_URL = 'http://api.tr.im/api'
> >    response =
> urllib2.urlopen('%s/trim_simple?url=%s&username=%s&password=%s'
> >                               % (TRIM_API_URL,
> >                                  url_to_trim,
> >                                  USERNAME,
> >                                  PASSWORD))
> >    url = response.read().strip()
> >
> > ...then not only is url valid but it's recorded in my tr.im account.
> > (Though response.code is still 200.)
> >
> > Either there must be something wrong in my authentication code, or in
> > tr.im's.  (I've written api at tr.im to see if it's a known problem and
> > haven't received a response.)
> >
> > Can anyone spot any problems?
> >
> > --
> > Daryl
> > _______________________________________________
> > Baypiggies mailing list
> > Baypiggies at python.org
> > To change your subscription options or unsubscribe:
> > http://mail.python.org/mailman/listinfo/baypiggies
> >
>
>
>
> --
> In this life we cannot do great things. We can only do small things
> with great love. -- Mother Teresa
> http://jjinux.blogspot.com/
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