from socket import *

import sys

if len(sys.argv) <= 1:

print 'Usage : "python ProxyServer.py server_ip"\n[server_ip : It is the IP Address Of Proxy Server'

sys.exit(2)

# Create a server socket, bind it to a port and start listening

tcpSerSock = socket(AF_INET, SOCK_STREAM)

tcpSerSock.bind((sys.argv[1],8888))

tcpSerSock.listen(100)

while 1:

#Start receiving data from the client

print ('Ready to serve...' )

tcpCliSock, addr = tcpSerSock.accept()

print ('Received a connection from:', addr)

message =   tcpCliSock.recv(1024)

  print (message)

#Extract the filename from the given message

print (message.split()[1])

filename = message.split()[1].partition("/")[2]

print (filename)

fileExist = "false"

filetouse = "/" + filename

print(fileouse)

try:

#Check wether the file exist in the cache

f = open(filetouse[1:], "r")

outputdata = f.readlines()

fileExist = "true"

#ProxyServer finds a cache hit and generates a response message

tcpCliSock.send("HTTP/1.0 200 OK\r\n")

tcpCliSock.send("Content-Type:text/html\r\n")

for i in range(0,len(outputdata)):

tcpCliSock.send(outputdata[i])

  print ('Read from cache')

  #Error handling for file not found in cache

  except IOError:

if fileExist == "false":

#Create a socket on the proxyserver

c = socket(AF_INET, SOCK_STREAM)

hostn = filename.replace("www."," ",1)

print (hostn)

try:

#Connect to the socket to port 80

c.connect((hosts,80))

# Create a temporary file on this socket and ask port 80 for the file requested by the client

fileobj = c.makefile('r', 0)

fileobj.write("GET "+"http://" + filename + "HTTP/1.0\n\n")

#Read the response into bufferFill in start.

   buffer = fileobj.readlines()

#Create a new file in the cache for the requested file.Also send the response in the buffer to #client socket and the corresponding file in the cache

tmpFile = open("./" + filename,"wb")

for line in buffer:

tmpFile.write(line)

tcpCliSock.send(line)

except:

print ("Illegal request")

else:

#HTTP response message for file not found

tcpCliSock.send("HTTP/1.0 404 sendErrorErrorError\r\n")

tcpCliSock.send("Content-Type:text/html\r\n")

tcpCliSock.send("\r\n")

#Close the client and the server sockets

tcpCliSock.close()

tcpSerSock.close()