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'''
SRI Message Signature helper, generating responses that:
* Include or exclude an `Integrity-Digest` header depending on the request's
`digest` parameter.
* Include or exclude an `Signature` header depending on the request's
`signature` parameter.
* Include or exclude an `Signature-Input` header depending on the request's
`signatureInput` parameter.
* Include or exclude `Access-Control-Allow-Origin: *` depending on the
request's `cors` parameter.
* Sets a `Content-Type` header from the request's `type` parameter.
* Echos the `body` parameter into the response body.
'''
def main(request, response):
digest = request.GET.first(b'digest', b'')
signature = request.GET.first(b'signature', b'')
signatureInput = request.GET.first(b'signatureInput', b'')
if digest:
response.headers.set(b'unencoded-digest', digest)
if signature:
response.headers.set(b'signature', signature)
if signatureInput:
response.headers.set(b'signature-input', signatureInput)
cors = request.GET.first(b'cors', '')
if cors:
response.headers.set(b'access-control-allow-origin', b'*')
response.headers.set(b'content-type',
request.GET.first(b'type', b'text/plain'))
# Reflect the `accept-signature` header from the request to the response.
acceptSigs = request.headers.get(b'accept-signature', b'')
response.headers.set(b'accept-signature', acceptSigs)
response.headers.set(b'access-control-expose-headers', b'accept-signature')
response.status = int(request.GET.first(b'status', "200"))
response.content = request.GET.first(b'body', '')
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