cn-py-serv/server/main.py

import threading
import socket
import logging

import config

from .file_read import fileiter


MAX_REQLINE = 64 * 1024

STATUS_CODE = {
    200: "OK",
    404: "Not Found",
    500: "Internal Server Error",
}


class Response:
    def __iter__(self):
        return self

    def __init__(self, status_code=200, additional_headers={}, data=None):
        self.status_code = status_code
        self.additional_headers = additional_headers
        self.data = data
        self.first = True

    def __next__(self):
        if self.first:
            resp = "HTTP/1.1 {} {}\r\n"
            resp += "Server: cnserv\r\n"
            resp += "Connection: close\r\n"
            for key, val in self.additional_headers.items():
                resp += "{}: {}\r\n".format(key, val)
            resp += "\r\n"

            resp = resp.format(self.status_code, STATUS_CODE[self.status_code])
            resp = resp.encode("UTF-8")

            if type(self.data) == bytes:
                resp += self.data

            self.first = False
            return resp

        else:
            if type(self.data) == bytes:
                raise StopIteration

            elif hasattr(self.data, "__iter__"):
                try:
                    return next(self.data)
                except StopIteration:
                    raise StopIteration

class HTTPHandler:
    http_type = ""
    http_address = ""
    headers = {}
    data = b""

    def __init__(self, conn, addr):
        self.conn = conn
        self.addr = addr

        self.read_fb = conn.makefile("rb")
        self.write_fb = conn.makefile("wb")

        self.pre_handle_connection()

    def pre_handle_connection(self):
        raw = self.read_fb.readline(MAX_REQLINE + 1)

        if len(raw) > MAX_REQLINE:
            logging.debug("Request line too long")
            self.conn.send(b"")
            self.conn.close()
            return

        req_line = raw.decode().rstrip("\r\n")
        req_line_splited = req_line.split(" ")

        if len(req_line_splited) != 3:
            logging.debug("Request head too long")
            self.conn.send(b"")
            self.conn.close()
            return

        if req_line_splited[2] == "HTTP/1.0" or req_line_splited[2] == "HTTP/1.1":
            self.http_type = req_line_splited[0]
            self.http_address = req_line_splited[1]
            self.http_header_handle()
        else:
            self.conn.send(b"")
            self.conn.close()

    def http_header_handle(self):
        while True:
            raw = self.read_fb.readline(MAX_REQLINE + 1)

            if len(raw) > MAX_REQLINE:
                logging.debug("Request header line too long")
                self.conn.send(b"")
                self.conn.close()
                return

            if raw == b"":
                self.conn.send(b"")
                self.conn.close()
                return

            if raw == b"\r\n":
                self.http_data_handle()
                break
            else:
                decoded_data = raw.decode("UTF-8").rstrip("\r\n")
                decoded_data_split = decoded_data.split(":", 1)
                self.headers.update({decoded_data_split[0]: decoded_data_split[1].strip(" ")})

    def http_data_handle(self):
        # TODO: Get from headers Content-Length and get body from request
        """

        raw = self.read_fb.readline(1024)

        if len(raw) == 1024:
            while True:
                self.data += raw

                if len(raw) < 1024:
                    break
                else:
                    raw = self.read_fb.readline(1024)
        """

        logging.debug(self.http_type)
        logging.debug(self.http_address)
        logging.debug(self.headers)
        logging.debug(self.data)

        self.send_form_data()

    def send_form_data(self):
        found = False

        for elem in config.urls:
            if self.http_address in elem.keys():
                url_metadata = elem[self.http_address]

                if self.http_type in url_metadata[0]:
                    found = True

                    if url_metadata[1] == "static-file":
                        r = Response(data=fileiter(url_metadata[2]))

                        for i in r:
                            self.write_fb.write(i)
                            self.write_fb.flush()
                    else:
                        logging.warning("Address configured on server, but not allowed URL type in URLs list")
                        r = Response(status_code=404, data=b"Address configured on server, but not allowed URL type in URLs list")

                        for i in r:
                            self.write_fb.write(i)
                            self.write_fb.flush()

        if not found:
            r = Response(status_code=404, data=b"Not found!")

            for i in r:
                self.write_fb.write(i)
                self.write_fb.flush()

        self.write_fb.close()
        self.read_fb.close()
        self.conn.close()


def start():
    logging.basicConfig(filename="main.log", filemode="a", encoding="UTF-8",
        level=logging.DEBUG, format="[%(asctime)s][%(levelname)s] %(message)s")

    logging.info("=== Separator ===")
    try:
        with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as main_server_socket:
            main_server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, True)
            main_server_socket.bind(("0.0.0.0", config.SETUP["server"]["port"]))
            main_server_socket.listen()

            while True:
                conn, addr = main_server_socket.accept()
                logging.info("Accept connection from %s", addr[0])

                thr_serv_conn = threading.Thread(target=HTTPHandler, args=(conn, addr,))
                thr_serv_conn.run()

    except KeyboardInterrupt:
        logging.info("Server get keyboard interrupt. Initialize server to stop")