socket-http-server/http_server.py at master · WesWang93/socket-http-server · GitHub

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import socket
import sys
import traceback
from mimetypes import *
import os

def response_ok(body=b"This is a minimal response", mimetype=b"text/plain"):
    """
    returns a basic HTTP response
    Ex:
        response_ok(
            b"<html><h1>Welcome:</h1></html>",
            b"text/html"
        ) ->

        b'''
        HTTP/1.1 200 OK\r\n
        Content-Type: text/html\r\n
        \r\n
        <html><h1>Welcome:</h1></html>\r\n
        '''
    """

    # TODO: Implement response_ok
    return b"\r\n".join([
        b'HTTP/1.1 200 OK',
        b'Content-Type: ' + bytes(mimetype,'utf-8'),
        b'',
        body
    ])

def response_method_not_allowed():
    """Returns a 405 Method Not Allowed response"""

    # TODO: Implement response_method_not_allowed
    return b"\r\n".join([
        b'HTTP/1.1 405 Method Not Allowed',
        b'',
        b'Method not allowed on this server!'
    ])


def response_not_found():
    """Returns a 404 Not Found response"""

    # TODO: Implement response_not_found
    return b"\r\n".join([
        b'HTTP/1.1 404 Not Found',
        b'',
        b'Content not found!'
    ])


def parse_request(request):
    """
    Given the content of an HTTP request, returns the path of that request.

    This server only handles GET requests, so this method shall raise a
    NotImplementedError if the method of the request is not GET.
    """

    # TODO: implement parse_request
    method, path, version = request.split('\r\n')[0].split(' ')

    if method != 'GET':
        raise NotImplementedError

    return path

def response_path(path):
    """
    This method should return appropriate content and a mime type.

    If the requested path is a directory, then the content should be a
    plain-text listing of the contents with mimetype `text/plain`.

    If the path is a file, it should return the contents of that file
    and its correct mimetype.

    If the path does not map to a real location, it should raise an
    exception that the server can catch to return a 404 response.

    Ex:
        response_path('/a_web_page.html') -> (b"<html><h1>North Carolina...",
                                            b"text/html")

        response_path('/images/sample_1.png')
                        -> (b"A12BCF...",  # contents of sample_1.png
                            b"image/png")

        response_path('/') -> (b"images/, a_web_page.html, make_type.py,...",
                             b"text/plain")

        response_path('/a_page_that_doesnt_exist.html') -> Raises a NameError

    """

    # TODO: Raise a NameError if the requested content is not present
    # under webroot.
    path = os.path.join('webroot', path.strip('/'))
    if not path:
        raise NameError

    # TODO: Fill in the appropriate content and mime_type give the path.
    # See the assignment guidelines for help on "mapping mime-types", though
    # you might need to create a special case for handling make_time.py
    #
    # If the path is "make_time.py", then you may OPTIONALLY return the
    # result of executing `make_time.py`. But you need only return the
    # CONTENTS of `make_time.py`.
    try:
        with open(path, 'rb') as file:
            content = file.read()
        mime_type = guess_type(path)[0]
    except FileNotFoundError:
        raise NameError

    return content, mime_type


def server(log_buffer=sys.stderr):
    address = ('127.0.0.1', 10000)
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    print("making a server on {0}:{1}".format(*address), file=log_buffer)
    sock.bind(address)
    sock.listen(1)

    try:
        while True:
            print('waiting for a connection', file=log_buffer)
            conn, addr = sock.accept()  # blocking
            try:
                print('connection - {0}:{1}'.format(*addr), file=log_buffer)

                request = ''
                while True:
                    data = conn.recv(1024)
                    request += data.decode('utf8')

                    if '\r\n\r\n' in request or len(data) == 0:
                        break


                print("Request received:\n{}\n\n".format(request))

                # TODO: Use parse_request to retrieve the path from the request.
                try:
                    path = parse_request(request)

                # TODO: Use response_path to retrieve the content and the mimetype,
                # based on the request path.
                    if path == "/images" or path == "/":
                        image_path = os.path.join('webroot', path.strip('/'))
                        content = b'Files available under this path:'
                        for item in os.listdir(image_path):
                            content += b'<br>' + os.fsencode(item)
                        mime_type = 'text/html'
                    else:
                        content, mime_type = response_path(path)

                # TODO; If parse_request raised a NotImplementedError, then let
                # response be a method_not_allowed response. If response_path raised
                # a NameError, then let response be a not_found response. Else,
                # use the content and mimetype from response_path to build a
                # response_ok.
                    response = response_ok(
                        body=content,
                        mimetype=mime_type
                    )
                except NotImplementedError:
                    response = response_method_not_allowed()
                except NameError:
                    response = response_not_found()
                    traceback.print_exc()

                conn.sendall(response)
            except:
                traceback.print_exc()
            finally:
                conn.close()

    except KeyboardInterrupt:
        sock.close()
        return
    except:
        traceback.print_exc()


if __name__ == '__main__':
    server()
    sys.exit(0)