Webserver.py

import socket
import os

#---------------------------------------------------------

def IsHTTPRequestGet(request) :
	request_category = request.split("\r\n")

	request_line = request_category[0].split(' ')

	if len(request_line) < 3 :
	
		return False

	request_type = request_line[0]
	if request_type not in ["GET"]:
		return False

	path = request_line[1]

	http_version = request_line[2]
	if http_version not in ["HTTP/1.1","HTTP/1.0"] :
		return False

	return request_type, path, http_version


#---------------------------------------------------------

class HTTP_Request :

	def __init__(self, request_type, path, http_version):
	    self.request_type = request_type
	    self.path = path
	    self.full_path = os.getcwd() + self.path
	    self.http_version = http_version

	def response(self) :
		list_cases = [Path_to_item(), Path_to_directory(), Path_to_nowhere()]
		for case in list_cases :
			if case.test(self) :
				status_n_msg = case.act(self)
				break
		message = """\
HTTP/1.1 {code} {status}
{headers}

{msg}
"""		

		return message.format(code = status_n_msg["code"], status =status_n_msg["status"] , headers = status_n_msg["headers"], msg = status_n_msg["msg"])
#---------------------------------------------------------
class Path_to_item(object) :
	def test(self, handler):
		if os.path.isfile(handler.full_path) :
			return True
		else : 
			return False
	def act(self, handler) :
		_, file_extension = os.path.splitext(handler.full_path)
		file_size = os.path.getsize(handler.full_path)

		header_here = "Content-Type: text/html"

		if file_extension == ".png" :
			header_here = "Content-Type: image/png"
		elif file_extension == ".ico" :
			header_here = "Content-Type: image/x-icon"

		f = open (handler.full_path, "rb")
		l = f.read(file_size)
		msg = l

		return {"code":"200", "status":"OK","headers": header_here,"msg": msg }

class Path_to_directory(object) :

	def test(self, handler):
		if os.path.isdir(handler.full_path) :
			return True
		else : 
			return False

	def act(self, handler) :
		entries = os.listdir(handler.full_path)
		entry_list = ""
		for i in entries :
			if i[0] != "." :
				entry_list = entry_list + "<br><a href =' ./"+handler.path +"/" + str(i)+"' >" + str(i) +"</a>"
			else :
				pass

		msg = "<h1>this directory exists</h1>" + str(entry_list)
		return {"code":"200", "status":"OK","headers": "Content-Type: text/html","msg": msg }

class Path_to_nowhere(object) :

	def test(self, handler):
		return True
		
	def act(self, handler) :
		return {"code":"400", "status":"Not Found","headers":"Content-Type: text/html","msg":"<h1>this does not exist<h1>" }
#---------------------------------------------------------


HOST, PORT = '', 8888

#Create Socket W/ options
listen_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
listen_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
#bind socket to host and port
listen_socket.bind((HOST, PORT))

#socket.listen(backlog) :Listen for connections made to the socket. 
#The backlog argument specifies the maximum number of queued connections 
#and should be at least 0; the maximum value is system-dependent (usually 5), 
#the minimum value is forced to 0.
listen_socket.listen(1)
print ('Serving HTTP on port %s ...' % PORT)

while True:
    client_connection, _ = listen_socket.accept()
    #connection object (new socket object --> cf request)
    #adress of the client socket

    #get the data transmitted by the socket
    conn = client_connection.recv(1024)

    request = IsHTTPRequestGet(conn )

    if request!= False :

    	request_get = HTTP_Request(request[0],request[1], request[2] )
    	http_response = request_get.response()

    else :
    	http_response ="""\
		There is an error
		"""
	
    client_connection.sendall(http_response)
    client_connection.close()