409 lines
16 KiB
Python
409 lines
16 KiB
Python
import logging
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import time
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import traceback
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from urllib.parse import unquote
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from twisted.internet.defer import inlineCallbacks, maybeDeferred
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from twisted.internet.interfaces import IProtocolNegotiationFactory
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from twisted.protocols.policies import ProtocolWrapper
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from twisted.web import http
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from zope.interface import implementer
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from .utils import parse_x_forwarded_for
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logger = logging.getLogger(__name__)
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class WebRequest(http.Request):
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"""
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Request that either hands off information to channels, or offloads
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to a WebSocket class.
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Does some extra processing over the normal Twisted Web request to separate
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GET and POST out.
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"""
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error_template = (
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"""
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<html>
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<head>
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<title>%(title)s</title>
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<style>
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body { font-family: sans-serif; margin: 0; padding: 0; }
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h1 { padding: 0.6em 0 0.2em 20px; color: #896868; margin: 0; }
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p { padding: 0 0 0.3em 20px; margin: 0; }
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footer { padding: 1em 0 0.3em 20px; color: #999; font-size: 80%%; font-style: italic; }
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</style>
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</head>
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<body>
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<h1>%(title)s</h1>
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<p>%(body)s</p>
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<footer>Daphne</footer>
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</body>
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</html>
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""".replace(
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"\n", ""
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)
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.replace(" ", " ")
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.replace(" ", " ")
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.replace(" ", " ")
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) # Shorten it a bit, bytes wise
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def __init__(self, *args, **kwargs):
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try:
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http.Request.__init__(self, *args, **kwargs)
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# Easy server link
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self.server = self.channel.factory.server
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self.application_queue = None
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self._response_started = False
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self.server.protocol_connected(self)
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except Exception:
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logger.error(traceback.format_exc())
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raise
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### Twisted progress callbacks
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@inlineCallbacks
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def process(self):
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try:
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self.request_start = time.time()
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# Get upgrade header
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upgrade_header = None
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if self.requestHeaders.hasHeader(b"Upgrade"):
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upgrade_header = self.requestHeaders.getRawHeaders(b"Upgrade")[0]
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# Get client address if possible
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if hasattr(self.client, "host") and hasattr(self.client, "port"):
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# client.host and host.host are byte strings in Python 2, but spec
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# requires unicode string.
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self.client_addr = [str(self.client.host), self.client.port]
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self.server_addr = [str(self.host.host), self.host.port]
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else:
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self.client_addr = None
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self.server_addr = None
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self.client_scheme = "https" if self.isSecure() else "http"
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# See if we need to get the address from a proxy header instead
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if self.server.proxy_forwarded_address_header:
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self.client_addr, self.client_scheme = parse_x_forwarded_for(
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self.requestHeaders,
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self.server.proxy_forwarded_address_header,
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self.server.proxy_forwarded_port_header,
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self.server.proxy_forwarded_proto_header,
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self.client_addr,
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self.client_scheme,
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)
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# Check for unicodeish path (or it'll crash when trying to parse)
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try:
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self.path.decode("ascii")
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except UnicodeDecodeError:
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self.path = b"/"
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self.basic_error(400, b"Bad Request", "Invalid characters in path")
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return
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# Calculate query string
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self.query_string = b""
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if b"?" in self.uri:
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self.query_string = self.uri.split(b"?", 1)[1]
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try:
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self.query_string.decode("ascii")
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except UnicodeDecodeError:
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self.basic_error(400, b"Bad Request", "Invalid query string")
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return
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# Is it WebSocket? IS IT?!
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if upgrade_header and upgrade_header.lower() == b"websocket":
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# Make WebSocket protocol to hand off to
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protocol = self.server.ws_factory.buildProtocol(
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self.transport.getPeer()
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)
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if not protocol:
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# If protocol creation fails, we signal "internal server error"
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self.setResponseCode(500)
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logger.warn("Could not make WebSocket protocol")
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self.finish()
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# Give it the raw query string
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protocol._raw_query_string = self.query_string
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# Port across transport
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transport, self.transport = self.transport, None
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if isinstance(transport, ProtocolWrapper):
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# i.e. TLS is a wrapping protocol
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transport.wrappedProtocol = protocol
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else:
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transport.protocol = protocol
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protocol.makeConnection(transport)
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# Re-inject request
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data = self.method + b" " + self.uri + b" HTTP/1.1\x0d\x0a"
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for h in self.requestHeaders.getAllRawHeaders():
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data += h[0] + b": " + b",".join(h[1]) + b"\x0d\x0a"
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data += b"\x0d\x0a"
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data += self.content.read()
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protocol.dataReceived(data)
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# Remove our HTTP reply channel association
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logger.debug("Upgraded connection %s to WebSocket", self.client_addr)
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self.server.protocol_disconnected(self)
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# Resume the producer so we keep getting data, if it's available as a method
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self.channel._networkProducer.resumeProducing()
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# Boring old HTTP.
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else:
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# Sanitize and decode headers, potentially extracting root path
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self.clean_headers = []
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self.root_path = self.server.root_path
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for name, values in self.requestHeaders.getAllRawHeaders():
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# Prevent CVE-2015-0219
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if b"_" in name:
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continue
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for value in values:
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if name.lower() == b"daphne-root-path":
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self.root_path = unquote(value.decode("ascii"))
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else:
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self.clean_headers.append((name.lower(), value))
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logger.debug("HTTP %s request for %s", self.method, self.client_addr)
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self.content.seek(0, 0)
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# Work out the application scope and create application
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self.application_queue = yield maybeDeferred(
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self.server.create_application,
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self,
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{
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"type": "http",
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# TODO: Correctly say if it's 1.1 or 1.0
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"http_version": self.clientproto.split(b"/")[-1].decode(
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"ascii"
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),
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"method": self.method.decode("ascii"),
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"path": unquote(self.path.decode("ascii")),
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"raw_path": self.path,
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"root_path": self.root_path,
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"scheme": self.client_scheme,
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"query_string": self.query_string,
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"headers": self.clean_headers,
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"client": self.client_addr,
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"server": self.server_addr,
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},
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)
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# Check they didn't close an unfinished request
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if self.application_queue is None or self.content.closed:
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# Not much we can do, the request is prematurely abandoned.
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return
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# Run application against request
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buffer_size = self.server.request_buffer_size
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while True:
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chunk = self.content.read(buffer_size)
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more_body = not (len(chunk) < buffer_size)
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payload = {
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"type": "http.request",
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"body": chunk,
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"more_body": more_body,
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}
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self.application_queue.put_nowait(payload)
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if not more_body:
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break
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except Exception:
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logger.error(traceback.format_exc())
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self.basic_error(
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500, b"Internal Server Error", "Daphne HTTP processing error"
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)
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def connectionLost(self, reason):
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"""
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Cleans up reply channel on close.
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"""
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if self.application_queue:
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self.send_disconnect()
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logger.debug("HTTP disconnect for %s", self.client_addr)
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http.Request.connectionLost(self, reason)
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self.server.protocol_disconnected(self)
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def finish(self):
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"""
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Cleans up reply channel on close.
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"""
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if self.application_queue:
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self.send_disconnect()
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logger.debug("HTTP close for %s", self.client_addr)
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http.Request.finish(self)
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self.server.protocol_disconnected(self)
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### Server reply callbacks
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def handle_reply(self, message):
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"""
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Handles a reply from the client
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"""
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# Handle connections that are already closed
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if self.finished or self.channel is None:
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return
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# Check message validity
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if "type" not in message:
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raise ValueError("Message has no type defined")
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# Handle message
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if message["type"] == "http.response.start":
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if self._response_started:
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raise ValueError("HTTP response has already been started")
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self._response_started = True
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if "status" not in message:
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raise ValueError(
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"Specifying a status code is required for a Response message."
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)
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# Set HTTP status code
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self.setResponseCode(message["status"])
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# Write headers
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for header, value in message.get("headers", {}):
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self.responseHeaders.addRawHeader(header, value)
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if self.server.server_name and self.server.server_name.lower() != "daphne":
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self.setHeader(b"server", self.server.server_name.encode("utf-8"))
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logger.debug(
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"HTTP %s response started for %s", message["status"], self.client_addr
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)
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elif message["type"] == "http.response.body":
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if not self._response_started:
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raise ValueError(
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"HTTP response has not yet been started but got %s"
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% message["type"]
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)
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# Write out body
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http.Request.write(self, message.get("body", b""))
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# End if there's no more content
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if not message.get("more_body", False):
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self.finish()
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logger.debug("HTTP response complete for %s", self.client_addr)
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try:
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uri = self.uri.decode("ascii")
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except UnicodeDecodeError:
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# The path is malformed somehow - do our best to log something
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uri = repr(self.uri)
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try:
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self.server.log_action(
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"http",
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"complete",
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{
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"path": uri,
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"status": self.code,
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"method": self.method.decode("ascii", "replace"),
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"client": "%s:%s" % tuple(self.client_addr)
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if self.client_addr
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else None,
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"time_taken": self.duration(),
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"size": self.sentLength,
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},
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)
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except Exception:
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logger.error(traceback.format_exc())
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else:
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logger.debug("HTTP response chunk for %s", self.client_addr)
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else:
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raise ValueError("Cannot handle message type %s!" % message["type"])
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def handle_exception(self, exception):
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"""
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Called by the server when our application tracebacks
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"""
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self.basic_error(500, b"Internal Server Error", "Exception inside application.")
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def check_timeouts(self):
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"""
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Called periodically to see if we should timeout something
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"""
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# Web timeout checking
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if self.server.http_timeout and self.duration() > self.server.http_timeout:
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if self._response_started:
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logger.warning("Application timed out while sending response")
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self.finish()
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else:
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self.basic_error(
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503,
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b"Service Unavailable",
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"Application failed to respond within time limit.",
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)
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### Utility functions
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def send_disconnect(self):
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"""
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Sends a http.disconnect message.
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Useful only really for long-polling.
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"""
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# If we don't yet have a path, then don't send as we never opened.
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if self.path:
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self.application_queue.put_nowait({"type": "http.disconnect"})
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def duration(self):
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"""
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Returns the time since the start of the request.
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"""
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if not hasattr(self, "request_start"):
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return 0
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return time.time() - self.request_start
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def basic_error(self, status, status_text, body):
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"""
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Responds with a server-level error page (very basic)
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"""
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self.handle_reply(
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{
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"type": "http.response.start",
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"status": status,
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"headers": [(b"Content-Type", b"text/html; charset=utf-8")],
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}
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)
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self.handle_reply(
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{
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"type": "http.response.body",
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"body": (
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self.error_template
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% {
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"title": str(status) + " " + status_text.decode("ascii"),
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"body": body,
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}
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).encode("utf8"),
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}
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)
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def __hash__(self):
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return hash(id(self))
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def __eq__(self, other):
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return id(self) == id(other)
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@implementer(IProtocolNegotiationFactory)
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class HTTPFactory(http.HTTPFactory):
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"""
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Factory which takes care of tracking which protocol
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instances or request instances are responsible for which
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named response channels, so incoming messages can be
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routed appropriately.
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"""
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def __init__(self, server):
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http.HTTPFactory.__init__(self)
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self.server = server
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def buildProtocol(self, addr):
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"""
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Builds protocol instances. This override is used to ensure we use our
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own Request object instead of the default.
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"""
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try:
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protocol = http.HTTPFactory.buildProtocol(self, addr)
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protocol.requestFactory = WebRequest
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return protocol
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except Exception:
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logger.error("Cannot build protocol: %s" % traceback.format_exc())
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raise
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# IProtocolNegotiationFactory
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def acceptableProtocols(self):
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"""
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Protocols this server can speak after ALPN negotiation. Currently that
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is HTTP/1.1 and optionally HTTP/2. Websockets cannot be negotiated
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using ALPN, so that doesn't go here: anyone wanting websockets will
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negotiate HTTP/1.1 and then do the upgrade dance.
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"""
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baseProtocols = [b"http/1.1"]
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if http.H2_ENABLED:
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baseProtocols.insert(0, b"h2")
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return baseProtocols
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