71 lines
2.5 KiB
Python
71 lines
2.5 KiB
Python
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from __future__ import absolute_import
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import jws.algos as algos
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from .exceptions import AlgorithmNotImplemented, ParameterNotImplemented, ParameterNotUnderstood, RouteMissingError
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class HeaderBase(object):
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def __init__(self, name, value, data):
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self.name = name
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self.value = self.clean(value)
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self.data = data
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def sign(self): return self.value
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def verify(self): return self.value
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def clean(self, value): return value
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class GenericString(HeaderBase):
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def clean(self, value):
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return str(value)
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class SignNotImplemented(HeaderBase):
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def sign(self):
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raise ParameterNotImplemented("Header Parameter %s not implemented in the context of signing" % self.name)
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class VerifyNotImplemented(HeaderBase):
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def verify(self):
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raise ParameterNotImplemented("Header Parameter %s not implemented in the context of verifying" % self.name)
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class NotImplemented(HeaderBase):
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def clean(self, *a):
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raise ParameterNotUnderstood("Could not find an action for Header Parameter '%s'" % self.name)
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class Algorithm(HeaderBase):
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def clean(self, value):
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try:
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self.methods = algos.route(value)
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except RouteMissingError as e:
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raise AlgorithmNotImplemented('"%s" not implemented.' % value)
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def sign(self):
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self.data['signer'] = self.methods['sign']
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def verify(self):
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self.data['verifier'] = self.methods['verify']
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KNOWN_HEADERS = {
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# REQUIRED, signing algo, see signing_methods
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'alg': Algorithm,
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# OPTIONAL, type of signed content
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'typ': GenericString,
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# OPTIONAL, JSON Key URL. See http://self-issued.info/docs/draft-jones-json-web-key.html
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'jku': VerifyNotImplemented,
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# OPTIONAL, key id, hint for which key to use.
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'kid': VerifyNotImplemented,
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# OPTIONAL, x.509 URL pointing to certificate or certificate chain
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'x5u': VerifyNotImplemented,
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# OPTIONAL, x.509 certificate thumbprint
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'x5t': VerifyNotImplemented,
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}
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# data is by reference
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def process(data, step):
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for param in data['header']:
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# The JWS Header Input MUST be validated to only include parameters
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# and values whose syntax and semantics are both understood and
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# supported. --- this is why it defaults to NotImplemented, which
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# raises an exception
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cls = KNOWN_HEADERS.get(param, NotImplemented)
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instance = cls(param, data['header'][param], data)
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procedure = getattr(instance, step)
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procedure()
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return data
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