Vault encrypt string cli (#21024)

* Add a vault 'encrypt_string' command.

The command will encrypt the string on the command
line and print out the yaml block that can be included
in a playbook.

To be prompted for a string to encrypt:
   
   ansible-vault encrypt_string --prompt

To specify a string on the command line:

   ansible-vault encrypt_string "some string to encrypt"

To read a string from stdin to encrypt:

   echo  "the plaintext to encrypt" | ansible-vault encrypt_string

If a --name or --stdin-name is provided, the output will include that name in yaml key value format: 

   $ ansible-vault encrypt_string "42" --name "the_answer"
    the_answer: !vault-encrypted |
          $ANSIBLE_VAULT;1.1;AES256
          <vault cipher text here>

plaintext provided via prompt, cli, and/or stdin can be mixed:

      $ ansible-vault encrypt_string "42" --name "the_answer" --prompt
      Vault password: 
      Variable name (enter for no name): some_variable
      String to encrypt: microfiber
      # The encrypted version of variable ("some_variable", the string #1 from the interactive prompt).
     some_variable: !vault-encrypted |
              $ANSIBLE_VAULT;1.1;AES256
              < vault cipher text here>
      # The encrypted version of variable ("the_answer", the string #2 from the command line args).
      the_answer: !vault-encrypted |
             $ANSIBLE_VAULT;1.1;AES256
             < vault cipher text here>

Encryption successful
* add stdin and prompting to vault 'encrypt_string'
* add a --name to encrypt_string to optional specify a var name
* prompt for a var name to use with --prompt
* add a --stdin-name for the var name for value read from stdin

1 files changed, 7 insertions, 0 deletions

diff --git a/lib/ansible/parsing/vault/__init__.py b/lib/ansible/parsing/vault/__init__.py
index 3c7a89a94c..2a98511f88 100644
--- a/lib/ansible/parsing/vault/__init__.py
+++ b/lib/ansible/parsing/vault/__init__.py
@@ -414,6 +414,13 @@ class VaultEditor:
         # shuffle tmp file into place
         self.shuffle_files(tmp_path, filename)
 
+    def encrypt_bytes(self, b_plaintext):
+        check_prereqs()
+
+        b_ciphertext = self.vault.encrypt(b_plaintext)
+
+        return b_ciphertext
+
     def encrypt_file(self, filename, output_file=None):
 
         check_prereqs()