How to encrypt files with Ruby and Active Support
In this tutorial, we will create a Ruby binstub that allows you to encrypt and decrypt files using Active Support’s EncryptedFile module. This script is particularly useful for those who need to protect sensitive information within their files.
These lines import the necessary Ruby modules: active_support/encrypted_file for encryption and decryption, and securerandom for key generation
The script expects one of three commands as the first argument: setup, write, or read. If no command is provided, the script will print an error message and exit.
The following build_encrypted_file method creates an instance of ActiveSupport::EncryptedFile with the necessary configuration options.
Next, we have two helper methods: handle_missing_key and handle_missing_file_argument. These methods print error messages and exit the script if a key or a file is missing, respectively.
For the write command, the script ensures that a file argument is provided and that a system editor is available to open the file. It then creates a new encrypted file if it does not exist and opens the file in the system editor for editing. When the editor is closed, the encrypted file is saved with the new content.
