81 lines
3.0 KiB
Python
81 lines
3.0 KiB
Python
###############################################################################
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#
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# The MIT License (MIT)
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#
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# Copyright (c) Tavendo GmbH
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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# THE SOFTWARE.
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#
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###############################################################################
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import hashlib
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from twisted.internet import reactor
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from autobahn.twisted.websocket import WebSocketServerFactory, \
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WebSocketServerProtocol, \
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listenWS
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class FrameBasedHashServerProtocol(WebSocketServerProtocol):
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"""
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Frame-based WebSockets server that computes a running SHA-256 for message
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data received. It will respond after every frame received with the digest
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computed up to that point. It can receive messages of unlimited number
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of frames. Digest is reset upon new message.
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"""
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def onMessageBegin(self, isBinary):
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WebSocketServerProtocol.onMessageBegin(self, isBinary)
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self.sha256 = hashlib.sha256()
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def onMessageFrame(self, payload):
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l = 0
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for data in payload:
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l += len(data)
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self.sha256.update(data)
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digest = self.sha256.hexdigest()
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print("Received frame with payload length {}, compute digest: {}".format(l, digest))
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self.sendMessage(digest.encode('utf8'))
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def onMessageEnd(self):
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self.sha256 = None
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if __name__ == '__main__':
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factory = WebSocketServerFactory(u"ws://127.0.0.1:9000")
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factory.protocol = FrameBasedHashServerProtocol
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enableCompression = False
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if enableCompression:
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from autobahn.websocket.compress import PerMessageDeflateOffer, \
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PerMessageDeflateOfferAccept
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# Function to accept offers from the client ..
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def accept(offers):
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for offer in offers:
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if isinstance(offer, PerMessageDeflateOffer):
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return PerMessageDeflateOfferAccept(offer)
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factory.setProtocolOptions(perMessageCompressionAccept=accept)
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listenWS(factory)
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reactor.run()
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