website/www/conservancy/__init__.py

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import hashlib
from django.conf import settings
2016-11-28 19:53:27 +00:00
from django.template import RequestContext
# This is backwards compatibilty support for a custom function we wrote
# ourselves that is no longer necessary in modern Django.
from django.shortcuts import render as render_template_with_context
class ParameterValidator(object):
def __init__(self, given_hash_or_params, params_hash_key=None):
if params_hash_key is None:
self.given_hash = given_hash_or_params
else:
self.given_hash = given_hash_or_params.get(params_hash_key)
seed = getattr(settings, 'CONSERVANCY_SECRET_KEY', '').encode('utf-8')
self.hasher = hashlib.sha256(seed)
if isinstance(self.given_hash, basestring):
self.hash_type = type(self.given_hash)
else:
self.hash_type = type(self.hasher.hexdigest())
self.valid = None
if not (self.given_hash and seed):
self.fail()
def __enter__(self):
self.valid = self.valid and None
return self
def __exit__(self, exc_type, exc_value, exc_tb):
if exc_type is None:
self.check()
else:
self.fail()
def validate(self, data):
self.valid = self.valid and None
self.hasher.update(data)
def check(self):
if self.valid or (self.valid is None):
self.valid = self.hash_type(self.hasher.hexdigest()) == self.given_hash
return self.valid
def fail(self):
self.valid = False