import hashlib
from django.conf import settings
from django.shortcuts import render_to_response
from django.template import RequestContext
HASH_ENCODING = 'utf-8'
def render_template_with_context(request, template_path, context_dict):
return render_to_response(template_path, context_dict,
context_instance=RequestContext(request))
def param_if_valid(params, param_name, hash_param_name, default=None):
try:
seed = settings.CONSERVANCY_SECRET_KEY
param_value = params[param_name]
param_bytes = param_value.encode(HASH_ENCODING)
given_hash = params[hash_param_name]
except (AttributeError, KeyError, UnicodeEncodeError):
return default
good_hash = hashlib.sha256()
good_hash.update(seed)
good_hash.update(param_bytes)
if given_hash == unicode(good_hash.hexdigest()):
return param_value
else: