mirror of
https://github.com/Grasscutters/mitmproxy.git
synced 2024-11-24 00:31:33 +00:00
255 lines
8.3 KiB
Python
255 lines
8.3 KiB
Python
from __future__ import (absolute_import, print_function, division)
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import itertools
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from hpack.hpack import Encoder, Decoder
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from netlib import http, utils
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from . import frame
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class HTTP2Protocol(object):
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ERROR_CODES = utils.BiDi(
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NO_ERROR=0x0,
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PROTOCOL_ERROR=0x1,
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INTERNAL_ERROR=0x2,
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FLOW_CONTROL_ERROR=0x3,
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SETTINGS_TIMEOUT=0x4,
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STREAM_CLOSED=0x5,
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FRAME_SIZE_ERROR=0x6,
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REFUSED_STREAM=0x7,
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CANCEL=0x8,
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COMPRESSION_ERROR=0x9,
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CONNECT_ERROR=0xa,
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ENHANCE_YOUR_CALM=0xb,
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INADEQUATE_SECURITY=0xc,
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HTTP_1_1_REQUIRED=0xd
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)
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# "PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n"
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CLIENT_CONNECTION_PREFACE =\
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'505249202a20485454502f322e300d0a0d0a534d0d0a0d0a'.decode('hex')
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ALPN_PROTO_H2 = 'h2'
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def __init__(self, tcp_handler, is_server=False, dump_frames=False):
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self.tcp_handler = tcp_handler
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self.is_server = is_server
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self.http2_settings = frame.HTTP2_DEFAULT_SETTINGS.copy()
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self.current_stream_id = None
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self.encoder = Encoder()
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self.decoder = Decoder()
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self.connection_preface_performed = False
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self.dump_frames = dump_frames
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def check_alpn(self):
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alp = self.tcp_handler.get_alpn_proto_negotiated()
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if alp != self.ALPN_PROTO_H2:
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raise NotImplementedError(
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"HTTP2Protocol can not handle unknown ALP: %s" % alp)
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return True
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def _receive_settings(self, hide=False):
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while True:
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frm = self.read_frame(hide)
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if isinstance(frm, frame.SettingsFrame):
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break
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def _read_settings_ack(self, hide=False): # pragma no cover
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while True:
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frm = self.read_frame(hide)
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if isinstance(frm, frame.SettingsFrame):
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assert frm.flags & frame.Frame.FLAG_ACK
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assert len(frm.settings) == 0
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break
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def perform_server_connection_preface(self, force=False):
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if force or not self.connection_preface_performed:
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self.connection_preface_performed = True
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magic_length = len(self.CLIENT_CONNECTION_PREFACE)
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magic = self.tcp_handler.rfile.safe_read(magic_length)
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assert magic == self.CLIENT_CONNECTION_PREFACE
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self.send_frame(frame.SettingsFrame(state=self), hide=True)
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self._receive_settings(hide=True)
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def perform_client_connection_preface(self, force=False):
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if force or not self.connection_preface_performed:
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self.connection_preface_performed = True
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self.tcp_handler.wfile.write(self.CLIENT_CONNECTION_PREFACE)
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self.send_frame(frame.SettingsFrame(state=self), hide=True)
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self._receive_settings(hide=True)
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def next_stream_id(self):
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if self.current_stream_id is None:
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if self.is_server:
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# servers must use even stream ids
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self.current_stream_id = 2
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else:
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# clients must use odd stream ids
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self.current_stream_id = 1
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else:
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self.current_stream_id += 2
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return self.current_stream_id
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def send_frame(self, frm, hide=False):
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raw_bytes = frm.to_bytes()
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self.tcp_handler.wfile.write(raw_bytes)
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self.tcp_handler.wfile.flush()
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if not hide and self.dump_frames: # pragma no cover
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print(frm.human_readable(">>"))
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def read_frame(self, hide=False):
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frm = frame.Frame.from_file(self.tcp_handler.rfile, self)
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if not hide and self.dump_frames: # pragma no cover
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print(frm.human_readable("<<"))
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if isinstance(frm, frame.SettingsFrame) and not frm.flags & frame.Frame.FLAG_ACK:
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self._apply_settings(frm.settings, hide)
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return frm
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def _apply_settings(self, settings, hide=False):
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for setting, value in settings.items():
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old_value = self.http2_settings[setting]
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if not old_value:
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old_value = '-'
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self.http2_settings[setting] = value
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frm = frame.SettingsFrame(
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state=self,
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flags=frame.Frame.FLAG_ACK)
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self.send_frame(frm, hide)
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# be liberal in what we expect from the other end
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# to be more strict use: self._read_settings_ack(hide)
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def _create_headers(self, headers, stream_id, end_stream=True):
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# TODO: implement max frame size checks and sending in chunks
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flags = frame.Frame.FLAG_END_HEADERS
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if end_stream:
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flags |= frame.Frame.FLAG_END_STREAM
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header_block_fragment = self.encoder.encode(headers)
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frm = frame.HeadersFrame(
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state=self,
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flags=flags,
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stream_id=stream_id,
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header_block_fragment=header_block_fragment)
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if self.dump_frames: # pragma no cover
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print(frm.human_readable(">>"))
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return [frm.to_bytes()]
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def _create_body(self, body, stream_id):
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if body is None or len(body) == 0:
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return b''
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# TODO: implement max frame size checks and sending in chunks
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# TODO: implement flow-control window
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frm = frame.DataFrame(
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state=self,
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flags=frame.Frame.FLAG_END_STREAM,
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stream_id=stream_id,
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payload=body)
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if self.dump_frames: # pragma no cover
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print(frm.human_readable(">>"))
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return [frm.to_bytes()]
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def create_request(self, method, path, headers=None, body=None):
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if headers is None:
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headers = []
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authority = self.tcp_handler.sni if self.tcp_handler.sni else self.tcp_handler.address.host
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if self.tcp_handler.address.port != 443:
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authority += ":%d" % self.tcp_handler.address.port
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headers = [
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(b':method', bytes(method)),
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(b':path', bytes(path)),
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(b':scheme', b'https'),
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(b':authority', authority),
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] + headers
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stream_id = self.next_stream_id()
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return list(itertools.chain(
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self._create_headers(headers, stream_id, end_stream=(body is None)),
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self._create_body(body, stream_id)))
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def read_response(self, *args):
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stream_id, headers, body = self._receive_transmission()
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response = http.Response("HTTP/2", headers[':status'], "", headers, body)
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response.stream_id = stream_id
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return response
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def read_request(self):
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stream_id, headers, body = self._receive_transmission()
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form_in = ""
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method = headers.get(':method', '')
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scheme = headers.get(':scheme', '')
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host = headers.get(':host', '')
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port = '' # TODO: parse port number?
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path = headers.get(':path', '')
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request = http.Request(form_in, method, scheme, host, port, path, "HTTP/2", headers, body)
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request.stream_id = stream_id
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return request
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def _receive_transmission(self):
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body_expected = True
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stream_id = 0
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header_block_fragment = b''
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body = b''
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while True:
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frm = self.read_frame()
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if isinstance(frm, frame.HeadersFrame)\
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or isinstance(frm, frame.ContinuationFrame):
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stream_id = frm.stream_id
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header_block_fragment += frm.header_block_fragment
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if frm.flags & frame.Frame.FLAG_END_STREAM:
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body_expected = False
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if frm.flags & frame.Frame.FLAG_END_HEADERS:
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break
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while body_expected:
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frm = self.read_frame()
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if isinstance(frm, frame.DataFrame):
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body += frm.payload
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if frm.flags & frame.Frame.FLAG_END_STREAM:
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break
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# TODO: implement window update & flow
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headers = {}
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for header, value in self.decoder.decode(header_block_fragment):
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headers[header] = value
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return stream_id, headers, body
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def create_response(self, code, stream_id=None, headers=None, body=None):
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if headers is None:
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headers = []
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headers = [(b':status', bytes(str(code)))] + headers
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if not stream_id:
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stream_id = self.next_stream_id()
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return list(itertools.chain(
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self._create_headers(headers, stream_id, end_stream=(body is None)),
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self._create_body(body, stream_id),
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))
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