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 python3

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check_headers.py

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#!/usr/bin/env python2

import sys

from os import unlink

from os.path import exists

HEADERS = ('Content-Disposition', 'Content-Length', 'Content-Type',

'ETag', 'Last-Modified')

def is_sig_header(header):

header = header.lower()

for s in HEADERS:

if header.startswith(s.lower()):

return True

def do():

headers_fn = sys.argv[1]

signature_fn = sys.argv[2]

# first, get all the headers from the latest request

with open(headers_fn) as fd:

headers = [line.strip() for line in fd.readlines()]

last_index = 0

for index, header in enumerate(headers):

if header.startswith('HTTP/1.'):

last_index = index

headers = headers[last_index:]

# select few headers for the signature

headers = [header for header in headers if is_sig_header(header)]

signature = '\n'.join(headers)

# read the original signature

if exists(signature_fn):

with open(signature_fn) as fd:

original_signature = fd.read()

if original_signature == signature:

return 0

unlink(signature_fn)

if signature:

with open(signature_fn, 'w') as fd:

fd.write(signature)

try:

ret = do()

except:

ret = 1

sys.exit(ret)