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100 lines
3.0 KiB
100 lines
3.0 KiB
"""
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@author Georg Hopp
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"""
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from base64 import b64encode, b64decode
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from hashlib import sha1
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from ..Protocol import Protocol
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from Parser import Parser
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from Composer import Composer
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from Message import Message
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from Protocol.Websocket.Websocket import Websocket
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class Http(Protocol):
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def __init__(self):
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self.parser = Parser()
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self.composer = Composer()
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def getParser(self):
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return self.parser
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def getComposer(self):
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return self.composer
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def createMessage(self, remote):
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return Message(remote)
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def createRequest(self, method=Message.METHOD_GET, uri='/', remote=None):
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request = self.createMessage(remote)
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request.setRequestLine(method, uri, 'HTTP/1.1')
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self._addCommonHeaders(request)
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return request
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def createResponse(self, request, code=200, resp_message='OK', remote=None):
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version = request.getHttpVersion()
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response = self.createMessage(remote)
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response.setStateLine(version, code, resp_message)
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self._addCommonHeaders(response)
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response.setHeader('Content-Length', '0')
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con_header = request.getHeader('Connection').lower()
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if 'keep-alive' in con_header:
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response.setHeader('Connection', 'Keep-Alive')
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if 'close' in con_header:
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response.setHeader('Connection', 'Close')
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return response
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def createUpgradeRequest(self, host, subprotocol=None):
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"""
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currently only for websocket updates
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"""
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request = self.createRequest()
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request.setHeaders([
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('Host', host),
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('Connection', 'Upgrade'),
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('Upgrade', 'websocket'),
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('Sec-WebSocket-Version', '13'),
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('Sec-WebSocket-Key', b64encode(''.join(chr(randint(0,255))
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for _ in range(16))))])
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if subprotocol:
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request.setHeader('Sec-WebSocket-Protocol', protocol)
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return request
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def createUpgradeResponse(self, request):
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"""
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currently only for websocket updates
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"""
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key = request.getHeader('Sec-WebSocket-Key')
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if not key:
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response = self.createResponse(request, 400, 'Bad Request')
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else:
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response = self.createResponse(request, 101, 'Switching Protocols')
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response.setHeaders([
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('Connection', 'Upgrade'),
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('Upgrade', 'websocket'),
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('Sec-WebSocket-Accept', b64encode(sha1(key+Websocket.WS_UUID).digest()))])
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return response
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def upgrade(self, message):
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"""
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TODO decide by the message which protocol to upgrade to.
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"""
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return Websocket()
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def _addCommonHeaders(self, message):
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from wsgiref.handlers import format_date_time
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from datetime import datetime
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from time import mktime
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date = format_date_time(mktime(datetime.now().timetuple()))
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message.setHeader('Date', date)
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# vim: set ft=python et ts=8 sw=4 sts=4:
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