Time for action – writing our own template for a URL redirector

Now, let's have a look at an example URL redirector program in Python, which can be extended to fit any scenario:

#!/usr/bin/env python

import sys

def redirect_url(line, concurrent):
  list = line.split(' ')
  # 1st or 2nd element of the list 
  # is the URL depending on concurrency
  if concurrent:
    old_url = list[1]
  else:
    old_url = list[0]

  # Do remember that the new_url 
  # should contain a '\n' at the end.
  new_url = '\n'
  # Take the decision and modify the url if needed
  if old_url.endswith('.avi'):
    # Rewrite example
    new_url = 'http://example.com/' + new_url
  elif old_url.endswith('.exe'):
    # Redirect example
    new_url = '302:http://google.co.in/' + new_url
  return new_url

def main(concurrent = True):
  # the format of the line read from stdin with concurrency is
  # ID URL ip-address/fqdn ident method myip=ip myport=port
  # and with concurrency disabled is
  # URL ip-address/fqdn ident...