Files @ 123eb7603cee
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Location: website/www/conservancy/__init__.py - annotation

Bradley M. Kuhn
Use typical way of putting the category in a block.

Django is so frustrating as it's never clear about how things trickle
up and down through templates, so move the category to the top like
the others.
import hashlib

from django.conf import settings
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', '')
        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