Using the Python programming language, add the following features to the client/
ID: 3879158 • Letter: U
Question
Using the Python programming language, add the following features to the client/server side chat room program below. The program should also include (1) a warning message from the server to the client if users use an inappropriate word in the chatroom, or (2) if there is a taboo word entered (a word that goes over the line), the system will exit for that particular user. The basic logic for these conditions are listed below, but it is still unclear how to include this within the server side of the program which is listed also.
==============server code===========
# Python program to implement server side of chat room.
import socket
import select
import sys
from thread import *
"""The first argument AF_INET is the address domain of the
socket. This is used when we have an Internet Domain with
any two hosts The second argument is the type of socket.
SOCK_STREAM means that data or characters are read in
a continuous flow."""
server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
# checks whether sufficient arguments have been provided
if len(sys.argv) != 3:
print "Correct usage: script, IP address, port number"
exit()
# takes the first argument from command prompt as IP address
IP_address = str(sys.argv[1])
# takes second argument from command prompt as port number
Port = int(sys.argv[2])
"""
binds the server to an entered IP address and at the
specified port number.
The client must be aware of these parameters
"""
server.bind((IP_address, Port))
"""
listens for 100 active connections. This number can be
increased as per convenience.
"""
server.listen(100)
list_of_clients = []
def clientthread(conn, addr):
# sends a message to the client whose user object is conn
conn.send("Welcome to this chatroom!")
while True:
try:
message = conn.recv(2048)
if message:
"""prints the message and address of the
user who just sent the message on the server
terminal"""
print "<" + addr[0] + "> " + message
# Calls broadcast function to send message to all
message_to_send = "<" + addr[0] + "> " + message
broadcast(message_to_send, conn)
else:
"""message may have no content if the connection
is broken, in this case we remove the connection"""
remove(conn)
except:
continue
"""Using the below function, we broadcast the message to all
clients who's object is not the same as the one sending
the message """
def broadcast(message, connection):
for clients in list_of_clients:
if clients!=connection:
try:
clients.send(message)
except:
clients.close()
# if the link is broken, we remove the client
remove(clients)
"""The following function simply removes the object
from the list that was created at the beginning of
the program"""
def remove(connection):
if connection in list_of_clients:
list_of_clients.remove(connection)
while True:
"""Accepts a connection request and stores two parameters,
conn which is a socket object for that user, and addr
which contains the IP address of the client that just
connected"""
conn, addr = server.accept()
"""Maintains a list of clients for ease of broadcasting
a message to all available people in the chatroom"""
list_of_clients.append(conn)
# prints the address of the user that just connected
print addr[0] + " connected"
# creates and individual thread for every user
# that connects
start_new_thread(clientthread,(conn,addr))
conn.close()
server.close()
=============CLient side============
# Python program to implement client side of chat room.
import socket
import select
import sys
server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
if len(sys.argv) != 3:
print "Correct usage: script, IP address, port number"
exit()
IP_address = str(sys.argv[1])
Port = int(sys.argv[2])
server.connect((IP_address, Port))
while True:
# maintains a list of possible input streams
sockets_list = [sys.stdin, server]
""" There are two possible input situations. Either the
user wants to give manual input to send to other people,
or the server is sending a message to be printed on the
screen. Select returns from sockets_list, the stream that
is reader for input. So for example, if the server wants
to send a message, then the if condition will hold true
below.If the user wants to send a message, the else
condition will evaluate as true"""
read_sockets,write_socket, error_socket = select.select(sockets_list,[],[])
for socks in read_sockets:
if socks == server:
message = socks.recv(2048)
print message
else:
message = sys.stdin.readline()
server.send(message)
sys.stdout.write("")
sys.stdout.write(message)
sys.stdout.flush()
server.close()
Explanation / Answer
What you can do is write a function in server side to check for sanity. Below is the modified version of the implementation you can use in your code.
# Takes the message and check if it is appropriate or not.
#return the corresponding values based on the value of the response. works just like a switch case.
return {
0: "",
1: "watch your language"
}[response]
Use the function call for sanityCheck as shown below in clientthread fucntion of server code.
.........
# Calls broadcast function to send message to all
message_to_send = "<" + addr[0] + "> " + message
response = sanityCheck(message_to_send )
# check the respone from sanityCheck
if response!="" :
conn.send(response)
# check if the connection is closed .If not then broadcast the message
if conn in list_of_clients:
broadcast(message_to_send, conn)
...........
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