Class: Kashi::SecretExpander

Inherits:
Object
  • Object
show all
Defined in:
lib/kashi/secret_expander.rb

Defined Under Namespace

Classes: Literal, Variable

Instance Method Summary collapse

Constructor Details

#initialize(provider_name) ⇒ SecretExpander

Returns a new instance of SecretExpander.



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# File 'lib/kashi/secret_expander.rb', line 11

def initialize(provider_name)
  @provider = load_provider(provider_name)
  @asked_variables = {}
end

Instance Method Details

#expand(str) ⇒ Object 



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# File 'lib/kashi/secret_expander.rb', line 16

def expand(str)
  return str unless str
  tokens = parse(str)
  variables = Set.new
  tokens.each do |token|
    if token.is_a?(Variable)
      unless @asked_variables.include?(token.name)
        variables << token.name
      end
    end
  end

  unless variables.empty?
    @provider.ask(variables).each do |k, v|
      @asked_variables[k] = v
    end
  end

  tokens.map do |token|
    case token
    when Literal
      token.literal
    when Variable
      @asked_variables.fetch(token.name)
    else
      raise ExpansionError.new("Unknown token type: #{token.class}")
    end
  end.join
end