Files @ 9b48cc94e651
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Location: website/www/conservancy/__init__.py - annotation

Bradley M. Kuhn
Continuing saga of the sizing chart problems for original shirts

Gildan removed the sizing chart entirely from their website again
after yet another redesign. Originally, we deep-linked into files in
their CDN for the charts, but it appears that in 5c72071 that I
introduced cut-and-paste error on the sizing charts. I cannot find
the original links, but finally I simply decided we'd mirror the
files in our CDN, which is where these now link to.

I suspect that I didn't do this to start for worrying about copyright
infringement, but upon second thought, I think it's very reasonably
fair use for us to distribute these images. We bought a lot of
t-shirts from Gildan and just trying to sell through.
from builtins import object
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', '').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