File downloader | Python Fiddle

# Authors: Bish0pQ, Inori
# Website: http://www.bish0pq.pw
# Proud member of Sinister.ly (IDE)
# Proud member of Criminal.cat

from urllib2 import URLError,HTTPError,urlopen	# downloading functionality + error classes
from string import ascii_lowercase,digits	# strings with loweralpha + digit charsets
from argparse import ArgumentParser		# CLI argument parser
from random import choice			# random element selector

charset=ascii_lowercase+digits	# charset in use
attempted=[]			# list of last 16 attempted urls
successes=0			# number of successful downloads

# create a parser instance
parser=ArgumentParser(description="Hunt for files on hosting sites like pomf")

# Add arguments to the parser
parser.add_argument('-v','--verbose',type=bool,default=False,help='enable verbose logging')
parser.add_argument('-e','--ext',metavar='ex',default='zip',help='extension to look for (no .)')
parser.add_argument('-r','--results',metavar='n',type=int,default=5,help='number of results to print')
parser.add_argument('-l','--length',metavar='n',type=int,default=6,help='length of file names')
parser.add_argument('url',action="store",help='url of the search target')

# get arguments
args=parser.parse_args()

def generate_url():
	"""generate the random string to use for a url"""
	# generate a random string of the specified length
	rand_str=''.join(choice(charset) for _ in range(args.length))
	
	# if the url was generated recently (unlikely), return
	# a recursive method call
	if rand_str in attempted: return generate_url()

if len(attempted)==16: attempted.pop(0)	# pop the list if it's already 16 items long
	attempted.append(rand_str)		# append the new url to the list
	return rand_str				# return the url
	
def create_req(url):
	"""create an http request for the target site using the generated url"""
	# full path of the link
	full_path=args.url+'/'+url+'.'+args.ext
	try:	
		f=urlopen(full_path)			# attempt to download the file
		print("[+] downloading '%s'"%full_path)	# print a message
		successes+=1

with open(url+'.'+args.ext) as file:
			file.write(f.read())	# write the file locally
	except HTTPError as err:
		# report error if verbose logging is enabled
		if args.verbose:
			print("[-] %s returned HTTP error code %d (%s)"%(full_path,err.code,err.reason))
	except URLError as err:
		# report error if verbose logging is enabled
		if args.verbose:
			print("[-] %s threw a URL error: %s"%(full_path,err.reason))

# main loop
while successes<args.results:
	# generate a url and attempt to download it
	create_req(generate_url())

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