old_contents: # Copyright (c) 2015, Frappe Technologies Pvt. Ltd. and Contributors
  # MIT License. See license.txt
  
  from __future__ import unicode_literals
  import hmac
  import urllib
  from frappe import _
  
  import frappe
  import frappe.utils
  
  def get_signed_params(params):
  	"""Sign a url by appending `&_signature=xxxxx` to given params (string or dict).
  
  	:param params: String or dict of parameters."""
  	if not isinstance(params, basestring):
  		params = urllib.urlencode(params)
  
  	signature = hmac.new(params)
  	signature.update(get_secret())
  	return params + "&_signature=" + signature.hexdigest()
  
  def get_secret():
  	return frappe.local.conf.get("secret") or str(frappe.db.get_value("User", "Administrator", "creation"))
  
  def verify_request():
  	"""Verify if the incoming signed request if it is correct."""
  	query_string = frappe.request.query_string if hasattr(frappe.request, "query_string") \
  		else frappe.local.flags.signed_query_string
  
  	params, signature = query_string.split("&_signature=")
  
  	given_signature = hmac.new(params.encode("utf-8"))
  
  	given_signature.update(get_secret())
  	valid = signature == given_signature.hexdigest()
  
  	if not valid:
  		frappe.respond_as_web_page(_("Invalid Link"),
  			_("This link is invalid or expired. Please make sure you have pasted correctly."))
  	return valid
  
  def get_url(cmd, params, nonce=None, secret=None):
  	if not nonce:
  		nonce = params
  	signature = get_signature(params, nonce, secret)
  	params['signature'] = signature
  	return frappe.utils.get_url("".join(['api/method/', cmd, '?', urllib.urlencode(params)]))
  
  def get_signature(params, nonce, secret=None):
  	params = "".join((frappe.utils.cstr(p) for p in params.values()))
  	if not secret:
  		secret = frappe.local.conf.get("secret") or "secret"
  
  	signature = hmac.new(str(nonce))
  	signature.update(secret)
  	signature.update(params)
  	return signature.hexdigest()
  
  def verify_using_doc(doc, signature, cmd):
  	params = doc.get_signature_params()
  	return signature == get_signature(params, doc.get_nonce())
  
  def get_url_using_doc(doc, cmd):
  	params = doc.get_signature_params()
  	return get_url(cmd, params, doc.get_nonce())
  
new_contents: # Copyright (c) 2015, Frappe Technologies Pvt. Ltd. and Contributors
  # MIT License. See license.txt
  
  from __future__ import unicode_literals
  import hmac
  import urllib
  from frappe import _
  
  import frappe
  import frappe.utils
  
  def get_signed_params(params):
  	"""Sign a url by appending `&_signature=xxxxx` to given params (string or dict).
  
  	:param params: String or dict of parameters."""
  	if not isinstance(params, basestring):
  		params = urllib.urlencode(params)
  
  	signature = hmac.new(params)
  	signature.update(get_secret())
  	return params + "&_signature=" + signature.hexdigest()
  
  def get_secret():
  	return frappe.local.conf.get("secret") or str(frappe.db.get_value("User", "Administrator", "creation"))
  
  def verify_request():
  	"""Verify if the incoming signed request if it is correct."""
  	query_string = frappe.local.flags.signed_query_string or \
  		getattr(frappe.request, 'query_string', None) \
  
  	valid = False
  
  	if '&_signature=' in query_string:
  		params, signature = query_string.split("&_signature=")
  
  		given_signature = hmac.new(params.encode("utf-8"))
  
  		given_signature.update(get_secret())
  		valid = signature == given_signature.hexdigest()
  
  	if not valid:
  		frappe.respond_as_web_page(_("Invalid Link"),
  			_("This link is invalid or expired. Please make sure you have pasted correctly."))
  
  	return valid
  
  def get_url(cmd, params, nonce=None, secret=None):
  	if not nonce:
  		nonce = params
  	signature = get_signature(params, nonce, secret)
  	params['signature'] = signature
  	return frappe.utils.get_url("".join(['api/method/', cmd, '?', urllib.urlencode(params)]))
  
  def get_signature(params, nonce, secret=None):
  	params = "".join((frappe.utils.cstr(p) for p in params.values()))
  	if not secret:
  		secret = frappe.local.conf.get("secret") or "secret"
  
  	signature = hmac.new(str(nonce))
  	signature.update(secret)
  	signature.update(params)
  	return signature.hexdigest()
  
  def verify_using_doc(doc, signature, cmd):
  	params = doc.get_signature_params()
  	return signature == get_signature(params, doc.get_nonce())
  
  def get_url_using_doc(doc, cmd):
  	params = doc.get_signature_params()
  	return get_url(cmd, params, doc.get_nonce())
  
subject: test for unsubscribe