Add the simple CLI interface.

cryptography_s_des_exploring/cli.py

@@ -0,0 +1,95 @@
+import random
+from rich.console import Console
+from rich.prompt import Confirm, Prompt, IntPrompt
+from rich.markdown import Markdown
+
+from cryptography_s_des_exploring.sdes.decrypt import decrypt
+from cryptography_s_des_exploring.sdes.encrypt import encrypt
+
+
+def yes_no_prompt(question: str) -> bool:
+    return Confirm.ask(question)
+
+
+def cli_generate_keys(console):
+    KEY_LENGTH = 10
+    key = ''.join(random.choice('01') for _ in range(KEY_LENGTH))
+
+    console.print(f"[yellow b]The key:[/] {key}\n")
+
+
+def cli_key_input(console):
+    while True:
+        key = Prompt.ask(f"[b]Enter the [yellow]key[/]", password=True)
+
+        if len(key) == 10 and len(key.replace('0', '').replace('1', '')) == 0:
+            return key
+
+        console.print(
+            "[red b][Error] THE KEY MUST BE 10 CHARACTERS LONG AND CONTAIN ONLY 1 OR 0 SYMBOLS!!![/]\n"
+        )
+
+
+def cli_encrypt_message(console):
+    key = cli_key_input(console)
+
+    message = Prompt.ask(f"[b]Enter the [yellow]message[/]")
+
+    ciphertext = encrypt(key, message)
+
+    console.print(f"[yellow b]The ciphertext:[/] \"{ciphertext.decode('utf-8')}\"\n")
+
+
+def cli_decrypt_message(console):
+    key = cli_key_input(console)
+
+    ciphertext = Prompt.ask(f"[b]Enter the [yellow]ciphertext[/]")
+
+    message = decrypt(key, ciphertext)
+
+    console.print(f"[yellow b]The message:[/] \"{message}\"\n")
+
+
+COMMANDS = """
+0. Help
+1. Generate a key.
+2. Encrypt a message
+3. Decrypt a message
+4. Exit
+
+"""
+
+HELP = """
+# cryptography-s-des-exploring
+
+cryptography-s-des-exploring is the application that will help you to learn about the S-DES cipher.
+
+## Commands
+
+"""
+
+
+def help(console):
+    console.print(Markdown(HELP + COMMANDS))
+    console.print("\n")
+
+
+def cli():
+    console = Console()
+    choices = list(map(str, range(0, 5)))
+
+    while True:
+        console.print(f"Commands:\n{COMMANDS}")
+        option = Prompt.ask("Choose the command:", choices=choices, default="0")
+        match option:
+            case "0":
+                help(console)
+            case "1":
+                cli_generate_keys(console)
+            case "2":
+                cli_encrypt_message(console)
+            case "3":
+                cli_decrypt_message(console)
+            case "4":
+                break
+