Files @ a8710b4b9f2a
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Location: website/www/conservancy/__init__.py

Denver Gingerich
Copyleft Compliance: mostly minor fixes to new pgs

These are mostly minor edits (typo fixes, etc.) to the enforcement
strategy and firmware liberation pages that were just added.

The one large change was to replace the first paragraph of the
enforcement strategy page with the full Conservancy description used
previously. The glue text used to shorten it appeared unsalvageable
and it wasn't immediately obvious how to replace it with something
better, so we used the full description instead.
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