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urlsigner.py
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urlsigner.py
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#!/usr/bin/python
# -*- coding: utf-8 -*-
""" Signs a URL using a URL signing secret """
import hashlib
import hmac
import base64
import urllib.parse as urlparse
def sign_url(input_url=None, secret=None):
""" Sign a request URL with a URL signing secret.
Usage:
from urlsigner import sign_url
signed_url = sign_url(input_url=my_url, secret=SECRET)
Args:
input_url - The URL to sign
secret - Your URL signing secret
Returns:
The signed request URL
"""
if not input_url or not secret:
raise Exception("Both input_url and secret are required")
url = urlparse.urlparse(input_url)
# We only need to sign the path+query part of the string
url_to_sign = url.path + "?" + url.query
# Decode the private key into its binary format
# We need to decode the URL-encoded private key
decoded_key = base64.urlsafe_b64decode(secret)
# Create a signature using the private key and the URL-encoded
# string using HMAC SHA1. This signature will be binary.
signature = hmac.new(decoded_key, str.encode(url_to_sign), hashlib.sha1)
# Encode the binary signature into base64 for use within a URL
encoded_signature = base64.urlsafe_b64encode(signature.digest())
original_url = url.scheme + "://" + url.netloc + url.path + "?" + url.query
# Return signed URL
return original_url + "&signature=" + encoded_signature.decode()
if __name__ == "__main__":
input_url = input("URL to Sign: ")
secret = input("URL signing secret: ")
print("Signed URL: " + sign_url(input_url, secret))