Arthur Bols
48c4f207a8
Renamed ServerMessage and ClientMessage to respectively ResponseMessage and RequestMessage to make it more clear.
124 lines
3.9 KiB
Python
124 lines
3.9 KiB
Python
import logging
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import os
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import sys
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from datetime import datetime
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from socket import socket
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from time import mktime
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from typing import Union
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from urllib.parse import ParseResultBytes, ParseResult
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from wsgiref.handlers import format_date_time
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from httplib import parser
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from httplib.exceptions import MethodNotAllowed, BadRequest, UnsupportedEncoding, NotImplemented, NotFound, \
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HTTPVersionNotSupported
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from httplib.httpsocket import HTTPSocket, FORMAT
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from httplib.message import RequestMessage as Message
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from httplib.retriever import Retriever, PreambleRetriever
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from server import command
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from server.serversocket import ServerSocket
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METHODS = ("GET", "HEAD", "PUT", "POST")
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class RequestHandler:
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conn: HTTPSocket
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root = os.path.join(os.path.dirname(sys.argv[0]), "public")
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def __init__(self, conn: socket, host):
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self.conn = ServerSocket(conn, host)
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def listen(self):
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retriever = PreambleRetriever(self.conn)
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while True:
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line = self.conn.read_line()
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if line in ("\r\n", "\r", "\n"):
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continue
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retriever.reset_buffer(line)
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self._handle_message(retriever, line)
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def _handle_message(self, retriever, line):
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lines = retriever.retrieve()
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(method, target, version) = parser.parse_request_line(line)
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headers = parser.parse_headers(lines)
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message = Message(version, method, target, headers, retriever.buffer)
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logging.debug("---request begin---\r\n%s---request end---", "".join(message.raw))
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self._validate_request(message)
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body = b""
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if self._has_body(headers):
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try:
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retriever = Retriever.create(self.conn, headers)
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except UnsupportedEncoding as e:
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logging.error("Encoding not supported: %s=%s", e.enc_type, e.encoding)
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raise NotImplemented(f"{e.enc_type}={e.encoding}")
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for buffer in retriever.retrieve():
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body += buffer
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message.body = body
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# completed message
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cmd = command.create(message)
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msg = cmd.execute()
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logging.debug("---response begin---\r\n%s\r\n---response end---", msg.split(b"\r\n\r\n", 1)[0].decode(FORMAT))
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self.conn.conn.sendall(msg)
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def _check_request_line(self, method: str, target: Union[ParseResultBytes, ParseResult], version):
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if method not in METHODS:
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raise MethodNotAllowed(METHODS)
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if version not in ("1.0", "1.1"):
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raise HTTPVersionNotSupported(version)
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# only origin-form and absolute-form are allowed
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if target.scheme not in ("", "http"):
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# Only http is supported...
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raise BadRequest(f"scheme={target.scheme}")
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if target.netloc != "" and target.netloc != self.conn.host and target.netloc != self.conn.host.split(":")[0]:
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raise NotFound(str(target))
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if target.path == "" or target.path[0] != "/":
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raise NotFound(str(target))
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def _validate_request(self, msg):
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if msg.version == "1.1" and "host" not in msg.headers:
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raise BadRequest("Missing host header")
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self._check_request_line(msg.method, msg.target, msg.version)
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def _has_body(self, headers):
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if "transfer-encoding" in headers:
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return True
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if "content-length" in headers and int(headers["content-length"]) > 0:
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return True
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return False
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@staticmethod
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def _get_date():
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now = datetime.now()
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stamp = mktime(now.timetuple())
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return format_date_time(stamp)
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@staticmethod
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def send_error(client: socket, code, message):
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message = f"HTTP/1.1 {code} {message}\r\n"
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message += RequestHandler._get_date() + "\r\n"
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message += "Content-Length: 0\r\n"
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message += "\r\n"
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logging.debug("---response begin---\r\n%s---response end---", message)
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client.sendall(message.encode(FORMAT))
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