group12.py

import socket
import requests
import time

"""
tform shifts string :m: by :shift: values up the ASCII mapping
"""
def tform(m,shift):
    n = ""
    for c in m:
        n = n + str(chr(ord(c)+shift))
    return n

"""
listen_and_fetch starts up a server socket locally on port 1234 and if it is a potentially valid hostname, acts as a proxy,
returning the response generated by making a HTTP GET request thereto
"""
def listen_and_fetch():
    server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    try:
        server_socket.bind(('0.0.0.0', 1234))
        server_socket.listen(1)
    except:
        print("There was an error seting up Action 6. Please wait a few mins or restart your computer.")
        return
    print("Waiting for something...")
    while True:
        client_socket, client_address = server_socket.accept()
        try:
            client_socket.sendall("Try sending me some text and see what happens...".encode('utf-8'))
            hostname = client_socket.recv(1024).decode('utf-8').strip()
            if not hostname:
                print("Input was empty, so skipping...")
                continue
            if not "." in hostname:
                print("Conditioning input...")
                client_socket.sendall("Next time try adding a TLD at the end of your URL!".encode("utf-8"))
                hostname = hostname + ".com"
            try:
                response = requests.get(f"http://{hostname}")
                client_socket.sendall(response.text.encode("utf-8"))
                print("Congratulations on finding the surprise! Press Ctrl+C to close.")
            except requests.exceptions.RequestException as e:
                print("There was an error")
        except Exception as e:
            print("There was a different kind of error")
        client_socket.close()

"""
connect_and_communicate sends a string to tcpbin.com's TCP echo service, which sends the same string back
"""
def connect_and_communicate(m,d=('tcpbin.com',4242),size=1024):
    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
        try:
            s.connect(d)
            s.sendall(m.encode('utf-8'))
            response = s.recv(size).decode('utf-8')
        except Exception as e:
            print("A serious error occurred")

"""
connect_and_tform connects to localhost:42001, sends a message, and returns the message shifted by the group number
"""
def connect_and_tform(sh,d=('127.0.0.1',42001),size=1024):
    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
        try:
            s.connect(d)
            s.sendall("Try sending me text and see what happens...".encode('utf-8'))
            response = s.recv(size).decode('utf-8')
            s.sendall(tform(str(response),shift=sh).encode('utf-8'))
        except Exception as e:
            print("It seems this action has failed for some reason... :-)")

if __name__ == "__main__":
    group = 12
    try:
        print("Hello, Group " + str(group))
        print("Press Ctrl+C to close")
        print("Performing Action 1...")
        connect_and_communicate("Group " + str(group) + "")
        print("Performing Action 2...")
        t = requests.post('http://httpbin.org/post',data={"t":time.ctime()})
        print("Performing Action 3...")
        s = requests.get('http://example.com')
        print("Performing Action 4...")
        connect_and_communicate(s.text)
        print("Performing Action 5...")
        connect_and_tform(group)
        print("Performing Action 6...")
        listen_and_fetch()
    except KeyboardInterrupt:
        print("Exiting")