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Class: ActiveSupport::EncryptedFile

Relationships & Source Files
Namespace Children
Exceptions:
InvalidKeyLengthError, MissingContentError, MissingKeyError
Extension / Inclusion / Inheritance Descendants
Subclasses:
EncryptedConfiguration
Inherits: Object
Defined in: activesupport/lib/active_support/encrypted_file.rb

Constant Summary

Class Method Summary

Instance Attribute Summary

Instance Method Summary

Constructor Details

.new(content_path:, key_path:, env_key:, raise_if_missing_key:) ⇒ EncryptedFile

[ GitHub ] 

  


# File 'activesupport/lib/active_support/encrypted_file.rb', line 42



def initialize(content_path:, key_path:, env_key:, raise_if_missing_key:)
  @content_path = Pathname.new(content_path).yield_self { |path| path.symlink? ? path.realpath : path }
  @key_path = Pathname.new(key_path)
  @env_key, @raise_if_missing_key = env_key, raise_if_missing_key
end


  







Class Method Details



  

    .expected_key_length  
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/encrypted_file.rb', line 35



def self.expected_key_length # :nodoc:
  @expected_key_length ||= generate_key.length
end


  








  

    .generate_key  
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/encrypted_file.rb', line 31



def self.generate_key
  SecureRandom.hex(ActiveSupport::MessageEncryptor.key_len(CIPHER))
end


  







Instance Attribute Details



  

    #content_path   (readonly)
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/encrypted_file.rb', line 40



attr_reader :content_path, :key_path, :env_key, :raise_if_missing_key


  








  

    #env_key   (readonly)
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/encrypted_file.rb', line 40



attr_reader :content_path, :key_path, :env_key, :raise_if_missing_key


  








  

    #key   (readonly)
  



  

    

Returns the encryption key, first trying the environment variable specified by #env_key, then trying the key file specified by #key_path. If #raise_if_missing_key is true, raises EncryptedFile::MissingKeyError if the environment variable is not set and the key file does not exist.


  



  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/encrypted_file.rb', line 52



def key
  read_env_key || read_key_file || handle_missing_key
end


  








  

    #key?  ⇒ Boolean  (readonly)
  



  

    

Returns truthy if #key is truthy. Returns falsy otherwise. Unlike #key, does not raise EncryptedFile::MissingKeyError when #raise_if_missing_key is true.


  





  


  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/encrypted_file.rb', line 58



def key?
  read_env_key || read_key_file
end


  








  

    #key_path   (readonly)
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/encrypted_file.rb', line 40



attr_reader :content_path, :key_path, :env_key, :raise_if_missing_key


  








  

    #raise_if_missing_key   (readonly)
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/encrypted_file.rb', line 40



attr_reader :content_path, :key_path, :env_key, :raise_if_missing_key


  







Instance Method Details



  

    #change(&block)  
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/encrypted_file.rb', line 83



def change(&block)
  writing read, &block
end


  








  

    #check_key_length   (private)
  



  

    
  





  
Raises:





  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/encrypted_file.rb', line 129



def check_key_length
  raise InvalidKeyLengthError if key&.length != self.class.expected_key_length
end


  








  

    #decrypt(contents)   (private)
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/encrypted_file.rb', line 108



def decrypt(contents)
  encryptor.decrypt_and_verify contents
end


  








  

    #encrypt(contents)   (private)
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/encrypted_file.rb', line 103



def encrypt(contents)
  check_key_length
  encryptor.encrypt_and_sign contents
end


  








  

    #encryptor   (private)
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/encrypted_file.rb', line 112



def encryptor
  @encryptor ||= ActiveSupport::MessageEncryptor.new([ key ].pack("H*"), cipher: CIPHER, serializer: Marshal)
end


  








  

    #handle_missing_key   (private)
  



  

    
  





  
Raises:





  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/encrypted_file.rb', line 125



def handle_missing_key
  raise MissingKeyError.new(key_path: key_path, env_key: env_key) if raise_if_missing_key
end


  








  

    #read  
  



  

    

Reads the file and returns the decrypted content.



Raises:



  



  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/encrypted_file.rb', line 70



def read
  if !key.nil? && content_path.exist?
    decrypt content_path.binread.strip
  else
    raise MissingContentError, content_path
  end
end


  








  

    #read_env_key   (private)
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/encrypted_file.rb', line 117



def read_env_key
  ENV[env_key].presence
end


  








  

    #read_key_file   (private)
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/encrypted_file.rb', line 121



def read_key_file
  @key_file_contents ||= (key_path.binread.strip if key_path.exist?)
end


  








  

    #write(contents)  
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/encrypted_file.rb', line 78



def write(contents)
  IO.binwrite "#{content_path}.tmp", encrypt(contents)
  FileUtils.mv "#{content_path}.tmp", content_path
end


  








  

    #writing(contents)   (private)
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/encrypted_file.rb', line 89



def writing(contents)
  Tempfile.create(["", "-" + content_path.basename.to_s.chomp(".enc")]) do |tmp_file|
    tmp_path = Pathname.new(tmp_file)
    tmp_path.binwrite contents

    yield tmp_path

    updated_contents = tmp_path.binread

    write(updated_contents) if updated_contents != contents
  end
end