117 lines
3.8 KiB
Python
117 lines
3.8 KiB
Python
import logging
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import mimetypes
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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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from httplib.httpsocket import HTTPSocket, FORMAT
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from httplib.retriever import Retriever
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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 = HTTPSocket(conn, host)
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def listen(self):
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logging.debug("Parsing request line")
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(method, target, version) = parser.parse_request_line(self.conn)
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headers = parser.parse_request_headers(self.conn)
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self._validate_request(method, target, version, headers)
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logging.debug("Parsed request-line: method: %s, target: %r", method, target)
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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()
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for buffer in retriever.retrieve():
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body += buffer
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# completed message
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self._handle_message(method, target.path, body)
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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 BadRequest()
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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()
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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()
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if target.path == "" or target.path[0] != "/":
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raise NotFound()
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norm_path = os.path.normpath(target.path)
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if not os.path.exists(self.root + norm_path):
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raise NotFound()
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def _validate_request(self, method, target, version, headers):
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if version == "1.1" and "host" not in headers:
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raise BadRequest()
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self._check_request_line(method, target, version)
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def _has_body(self, headers):
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return "transfer-encoding" in headers or "content-encoding" in headers
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def _get_date(self):
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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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def _handle_message(self, method: str, target, body: bytes):
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date = self._get_date()
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if method == "GET":
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if target == "/":
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path = self.root + "/index.html"
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else:
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path = self.root + target
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mime = mimetypes.guess_type(path)[0]
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if mime.startswith("test"):
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file = open(path, "rb", FORMAT)
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else:
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file = open(path, "rb")
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buffer = file.read()
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file.close()
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message = "HTTP/1.1 200 OK\r\n"
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message += date + "\r\n"
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if mime:
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message += f"Content-Type: {mime}"
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if mime.startswith("test"):
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message += "; charset=UTF-8"
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message += "\r\n"
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message += f"Content-Length: {len(buffer)}\r\n"
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message += "\r\n"
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message = message.encode(FORMAT)
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message += buffer
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message += b"\r\n"
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logging.debug("Sending: %r", message)
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self.conn.conn.sendall(message)
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