Forging a new example: encrypt a directory for a single policy and label.

examples/populate_mario_box.py

@@ -0,0 +1,59 @@
+#!/usr/bin/env python
+
+import base64
+import json
+import os
+
+import click
+import libnacl.secret
+
+from nucypher.characters.lawful import Enrico
+from nucypher.cli.actions import make_cli_character
+from nucypher.config.characters import AliceConfiguration
+
+
+@click.command()
+# @click.option('--plaintext-pass-through', type=click.BOOL, required=True)  # FIXME
+@click.option('--plaintext-dir', type=click.STRING, required=True)
+@click.option('--alice-config', type=click.STRING)
+@click.option('--label', type=click.STRING, required=True)
+def mario_box_cli(plaintext_dir, alice_config, label):
+    click.secho("Starting Up...", fg='green')
+
+    # Derive Policy Encrypting Key
+    alice_configuration = AliceConfiguration.from_configuration_file(filepath=alice_config)
+    alice = make_cli_character(character_config=alice_configuration)
+    policy_encrypting_key = alice.get_policy_encrypting_key_from_label(label=label.encode())
+
+    message_kits = list()
+    paths = list(os.listdir(plaintext_dir))
+    for path in paths:
+        filepath = os.path.join(plaintext_dir, path)
+        click.secho(f'Processing {filepath}...')
+        with open(filepath, 'rb') as file:
+            plaintext = file.read()
+            encoded_plaintext = base64.b64encode(plaintext)
+
+            # Make the Box
+            box = libnacl.secret.SecretBox()
+
+            # Encrypt file contents symmetrically
+            ciphertext = box.encrypt(encoded_plaintext)
+            base64_ciphertext = base64.b64encode(ciphertext).decode()
+
+            # Encrypt the symmetric key
+            enrico = Enrico(policy_encrypting_key=policy_encrypting_key)
+            message_kit, _signature = enrico.encrypt_message(message=box.sk)
+            base64_message_kit = base64.b64encode(bytes(message_kit)).decode()
+
+            # Collect ciphertext-message-kit pairs.
+            message_kits.append((base64_ciphertext, base64_message_kit))
+            click.secho(f"Encrypted {filepath}...")
+
+    # Generate the output
+    output = {'ciphertexts': message_kits, 'pek': bytes(policy_encrypting_key).hex()}
+    click.secho(json.dumps(output))
+
+
+if __name__ == '__main__':
+    mario_box_cli()

nucypher/cli/actions.py

@@ -46,6 +46,7 @@ from nucypher.blockchain.eth.registry import (
 )
 from nucypher.blockchain.eth.token import NU
 from nucypher.blockchain.eth.token import Stake
+from nucypher.characters.control.emitters import StdoutEmitter
 from nucypher.cli import painting
 from nucypher.cli.types import IPV4_ADDRESS
 from nucypher.config.constants import DEFAULT_CONFIG_ROOT, NUCYPHER_ENVVAR_KEYRING_PASSWORD