Added FTP Client and Server first draft

client.py

@@ -0,0 +1,102 @@
+import os
+import socket
+
+# This prints 1 line at first, then the whole list after running the command again
+def handle_list(conn, args):
+    # Show list of files received from server in response to LIST command
+    # Response is a multi-line string
+    response = conn.recv(1024).decode('latin-1').strip()
+    print(response)
+
+    # Check for multi-line response
+    while response.startswith("1"):
+        response = conn.recv(1024).decode("latin-1")
+        print(response)
+
+
+def handle_quit(conn, args):
+    conn.sendall("QUIT\r\n".encode())
+    # Receive response from server
+    # Decode bytes to string
+    response = conn.recv(1024).decode('utf-8').strip()
+    print(response)
+    conn.close()
+    return True
+
+
+def handle_dwld(conn, args):
+    filename = args
+    conn.sendall(f"DWLD {filename}\r".encode())
+
+    filedata = conn.recv(1024)
+    print(filedata)
+    with open(filename, "wb") as f:
+        f.write(filedata)
+    print("File downloaded successfully")
+
+def handle_UPLD(conn, args):
+    filename = args
+    if not os.path.exists(filename):
+        print("File does not exist")
+    else:
+        with open(filename, "rb") as f:
+            filedata = f.read(4096)
+            file_size = os.path.getsize(filename)
+            conn.sendall(f"UPLD {filename} {file_size}\r".encode())
+            conn.sendall(filedata)
+        response = conn.recv(1024).decode().strip()
+        print(response)
+
+def user_input():
+    # Get user input
+    user_input = input("> ").strip()
+
+    # Parse command and arguments
+    if " " in user_input:
+        command, args = user_input.split(" ", 1)
+    else:
+        command, args = user_input, ""
+
+    return command, args
+
+
+def ftp_cient(host, port):
+    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    sock.connect((host, port))
+
+    response = sock.recv(1024).decode().strip()
+    print(response)
+
+    while True:
+        user_input = input("> ").strip()
+
+        if " " in user_input:
+            command, args = user_input.split(" ", 1)
+        else:
+            command, args = user_input, ""
+
+        if command.upper() == "LIST":
+            sock.sendall("LIST\r\n".encode())
+            handle_list(sock, args)
+        elif command.upper() == "QUIT":
+            handle_quit(sock, args)
+            break
+        elif command.upper() == "DWLD":
+            handle_dwld(sock, args)
+        elif command.upper() == "UPLD":
+            handle_UPLD(sock, args)
+        elif command.upper() == "DELF":
+            filename = args
+            sock.sendall(f"DELF {filename}\r".encode())
+        elif command.upper() == "RNTO":
+            oldName, newName = args.split(" ", 1)
+            sock.sendall(f"RNTO {oldName} {newName}\r".encode())
+        else:
+            print("Invalid command")
+
+    sock.close()
+
+
+if __name__ == "__main__":
+    # FTP Client should be able to define IP and port
+    ftp_cient("127.0.0.1", 2001)