def _signingPayload(self, canonical):
return '\n'.join([
'AWS4-HMAC-SHA256',
timestampToHttpString(self._timestamp),
self._scope(),
hashlib.sha256(canonical).hexdigest()
])
def _signingChunkPayload(self, previousSignature, chunkData):
return '\n'.join([
'AWS4-HMAC-SHA256-PAYLOAD',
timestampToHttpString(self._timestamp),
self._scope(),
previousSignature,
hashlib.sha256('').hexdigest(),
hashlib.sha256(chunkData).hexdigest()
])
def signRequest(self, request):
request.headers.addRawHeader(
'Date', timestampToHttpString(self._timestamp)
)
request.headers.addRawHeader(
'x-amz-content-sha256', request.bodyHash()
)
headers, canonical = request.canonicalized()
signingKey = self._signingKey()
signingPayload = self._signingPayload(canonical)
signature = sign(signingKey, signingPayload, True)
authorization = (
'AWS4-HMAC-SHA256 Credential={},SignedHeaders={},Signature={}'
.format(self._credentials(), headers, signature)
)
request.headers.addRawHeader('Authorization', authorization)
self._previousSignature = signature