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Class: ActiveRecord::Encryption::Scheme

Relationships & Source Files
Inherits: Object
Defined in: activerecord/lib/active_record/encryption/scheme.rb

Overview

A container of attribute encryption options.

It validates and serves attribute encryption options.

See EncryptedAttributeType, Context

Class Method Summary

Instance Attribute Summary

Instance Method Summary

Constructor Details

.new(key_provider: nil, key: nil, deterministic: nil, support_unencrypted_data: nil, downcase: nil, ignore_case: nil, previous_schemes: nil, compress: true, compressor: nil, **context_properties) ⇒ Scheme

[ GitHub ] 

  


# File 'activerecord/lib/active_record/encryption/scheme.rb', line 13



def initialize(key_provider: nil, key: nil, deterministic: nil, support_unencrypted_data: nil, downcase: nil, ignore_case: nil,
               previous_schemes: nil, compress: true, compressor: nil, **context_properties)
  # Initializing all attributes to nil as we want to allow a "not set" semantics so that we
  # can merge schemes without overriding values with defaults. See #merge

  @key_provider_param = key_provider
  @key = key
  @deterministic = deterministic
  @support_unencrypted_data = support_unencrypted_data
  @downcase = downcase || ignore_case
  @ignore_case = ignore_case
  @previous_schemes_param = previous_schemes
  @previous_schemes = Array.wrap(previous_schemes)
  @context_properties = context_properties
  @compress = compress
  @compressor = compressor

  validate_config!

  @context_properties[:encryptor] = Encryptor.new(compress: @compress) unless @compress
  @context_properties[:encryptor] = Encryptor.new(compressor: compressor) if compressor
end


  







Instance Attribute Details



  

    #deterministic?  ⇒ Boolean  (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/encryption/scheme.rb', line 44



def deterministic?
  !!@deterministic
end


  








  

    #downcase?  ⇒ Boolean  (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/encryption/scheme.rb', line 40



def downcase?
  @downcase
end


  








  

    #fixed?  ⇒ Boolean  (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/encryption/scheme.rb', line 52



def fixed?
  # by default deterministic encryption is fixed
  @fixed ||= @deterministic && (!@deterministic.is_a?(Hash) || @deterministic[:fixed])
end


  








  

    #ignore_case?  ⇒ Boolean  (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/encryption/scheme.rb', line 36



def ignore_case?
  @ignore_case
end


  








  

    #previous_schemes   (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/encryption/scheme.rb', line 11



attr_accessor :previous_schemes


  








  

    #support_unencrypted_data?  ⇒ Boolean  (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/encryption/scheme.rb', line 48



def support_unencrypted_data?
  @support_unencrypted_data.nil? ? ActiveRecord::Encryption.config.support_unencrypted_data : @support_unencrypted_data
end


  







Instance Method Details



  

    #compatible_with?(other_scheme)  ⇒ Boolean 
  



  

    
  





  


  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/encryption/scheme.rb', line 78



def compatible_with?(other_scheme)
  deterministic? == other_scheme.deterministic?
end


  








  

    #default_key_provider   (private)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/encryption/scheme.rb', line 102



def default_key_provider
  ActiveRecord::Encryption.key_provider
end


  








  

    #deterministic_key_provider   (private)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/encryption/scheme.rb', line 96



def deterministic_key_provider
  @deterministic_key_provider ||= if @deterministic
    DeterministicKeyProvider.new(ActiveRecord::Encryption.config.deterministic_key)
  end
end


  








  

    #key_provider  
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/encryption/scheme.rb', line 57



def key_provider
  @key_provider_param || key_provider_from_key || deterministic_key_provider || default_key_provider
end


  








  

    #key_provider_from_key   (private)
  

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# File 'activerecord/lib/active_record/encryption/scheme.rb', line 90



def key_provider_from_key
  @key_provider_from_key ||= if @key.present?
    DerivedSecretKeyProvider.new(@key)
  end
end


  








  

    #merge(other_scheme)  
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/encryption/scheme.rb', line 61



def merge(other_scheme)
  self.class.new(**to_h, **other_scheme.to_h)
end


  








  

    #to_h  
  

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# File 'activerecord/lib/active_record/encryption/scheme.rb', line 65



def to_h
  { key_provider: @key_provider_param, deterministic: @deterministic, downcase: @downcase, ignore_case: @ignore_case,
    previous_schemes: @previous_schemes_param, **@context_properties }.compact
end


  








  

    #validate_config!   (private)
  



  

    
  





  
Raises:





  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/encryption/scheme.rb', line 83



def validate_config!
  raise Errors::Configuration, "ignore_case: can only be used with deterministic encryption" if @ignore_case && !@deterministic
  raise Errors::Configuration, "key_provider: and key: can't be used simultaneously" if @key_provider_param && @key
  raise Errors::Configuration, "compressor: can't be used with compress: false" if !@compress && @compressor
  raise Errors::Configuration, "compressor: can't be used with encryptor" if @compressor && @context_properties[:encryptor]
end


  








  

    #with_context(&block)  
  

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# File 'activerecord/lib/active_record/encryption/scheme.rb', line 70



def with_context(&block)
  if @context_properties.present?
    ActiveRecord::Encryption.with_encryption_context(**@context_properties, &block)
  else
    block.call
  end
end