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require "yaml"
require "active_support/message_encryptor"
require "active_support/core_ext/string/strip"
module Rails
# Greatly inspired by Ara T. Howard's magnificent sekrets gem. 😘
class Secrets # :nodoc:
class MissingKeyError < RuntimeError
def initialize
super(<<-end_of_message.squish)
Missing encryption key to decrypt secrets with.
Ask your team for your master key and put it in ENV["RAILS_MASTER_KEY"]
end_of_message
end
end
@cipher = "aes-128-gcm"
@root = File # Wonky, but ensures `join` uses the current directory.
class << self
attr_writer :root
def parse(paths, env:)
paths.each_with_object(Hash.new) do |path, all_secrets|
require "erb"
secrets = YAML.load(ERB.new(preprocess(path)).result) || {}
all_secrets.merge!(secrets["shared"].deep_symbolize_keys) if secrets["shared"]
all_secrets.merge!(secrets[env].deep_symbolize_keys) if secrets[env]
end
end
def generate_key
SecureRandom.hex(OpenSSL::Cipher.new(@cipher).key_len)
end
def key
ENV["RAILS_MASTER_KEY"] || read_key_file || handle_missing_key
end
def template
<<-end_of_template.strip_heredoc
# See `secrets.yml` for tips on generating suitable keys.
# production:
# external_api_key: 1466aac22e6a869134be3d09b9e89232fc2c2289…
end_of_template
end
def encrypt(data)
encryptor.encrypt_and_sign(data)
end
def decrypt(data)
encryptor.decrypt_and_verify(data)
end
def read
decrypt(IO.binread(path))
end
def write(contents)
IO.binwrite("#{path}.tmp", encrypt(contents))
FileUtils.mv("#{path}.tmp", path)
end
def read_for_editing(&block)
writing(read, &block)
end
def read_template_for_editing(&block)
writing(template, &block)
end
private
def handle_missing_key
raise MissingKeyError
end
def read_key_file
if File.exist?(key_path)
IO.binread(key_path).strip
end
end
def key_path
@root.join("config", "secrets.yml.key")
end
def path
@root.join("config", "secrets.yml.enc").to_s
end
def preprocess(path)
if path.end_with?(".enc")
decrypt(IO.binread(path))
else
IO.read(path)
end
end
def writing(contents)
tmp_path = File.join(Dir.tmpdir, File.basename(path))
File.write(tmp_path, contents)
yield tmp_path
write(File.read(tmp_path))
ensure
FileUtils.rm(tmp_path) if File.exist?(tmp_path)
end
def encryptor
@encryptor ||= ActiveSupport::MessageEncryptor.new([ key ].pack("H*"), cipher: @cipher)
end
end
end
end
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