Compute signature of a http from Hoiio. This is used to authenticate the notification from Hoiio. Match this computed signature with the HTTP header "X-Hoiio-Signature".

hoiio_signature.py

import hmac
import hashlib

def sign(payload, key):
	dig = hmac.new(key, msg=payload, digestmod=hashlib.sha256).digest()
	return dig.encode('hex')

if __name__ == "__main__":
	import sys
	if (len(sys.argv) == 3):
		payload = sys.argv[1];
		accessToken = sys.argv[2];
	else:
		# Example
		payload 	= 'to=%2B6511111111&dest=&session=S32&tag=&call_state=ringing&from=%2B6522222222&txn_ref=AA-C-1000000'
		accessToken = 'AAAAAAAAAAAAAAAA'
	print "Computed Signature: " + sign(payload, accessToken)