48 lines
1.5 KiB
Python
48 lines
1.5 KiB
Python
import hashlib
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from django.conf import settings
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from django.shortcuts import render_to_response
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from django.template import RequestContext
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class ParameterValidator(object):
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def __init__(self, given_hash_or_params, params_hash_key=None):
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if params_hash_key is None:
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self.given_hash = given_hash_or_params
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else:
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self.given_hash = given_hash_or_params.get(params_hash_key)
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seed = getattr(settings, 'CONSERVANCY_SECRET_KEY', '')
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self.hasher = hashlib.sha256(seed)
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if isinstance(self.given_hash, basestring):
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self.hash_type = type(self.given_hash)
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else:
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self.hash_type = type(self.hasher.hexdigest())
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self.valid = None
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if not (self.given_hash and seed):
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self.fail()
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def __enter__(self):
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self.valid = self.valid and None
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return self
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def __exit__(self, exc_type, exc_value, exc_tb):
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if exc_type is None:
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self.check()
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else:
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self.fail()
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def validate(self, data):
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self.valid = self.valid and None
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self.hasher.update(data)
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def check(self):
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if self.valid or (self.valid is None):
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self.valid = self.hash_type(self.hasher.hexdigest()) == self.given_hash
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return self.valid
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def fail(self):
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self.valid = False
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def render_template_with_context(request, template_path, context_dict):
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return render_to_response(template_path, context_dict,
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context_instance=RequestContext(request))
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