Class: IntercomRails::EncryptedMode

Inherits:
Object
  • Object
show all
Defined in:
lib/intercom-rails/encrypted_mode.rb

Constant Summary collapse

ENCRYPTED_MODE_SETTINGS_WHITELIST = 
[:app_id, :session_duration, :widget, :custom_launcher_selector, :hide_default_launcher, :alignment, :horizontal_padding, :vertical_padding]

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(secret, initialization_vector, options) ⇒ EncryptedMode

Returns a new instance of EncryptedMode.



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# File 'lib/intercom-rails/encrypted_mode.rb', line 7

def initialize(secret, initialization_vector, options)
  @secret = secret
  @initialization_vector = initialization_vector || SecureRandom.random_bytes(12)
  @enabled = options.fetch(:enabled, false)
end

Instance Attribute Details

#enabled ⇒ Object (readonly)

Returns the value of attribute enabled.



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# File 'lib/intercom-rails/encrypted_mode.rb', line 3

def enabled
  @enabled
end

#initialization_vector ⇒ Object (readonly)

Returns the value of attribute initialization_vector.



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# File 'lib/intercom-rails/encrypted_mode.rb', line 3

def initialization_vector
  @initialization_vector
end

#secret ⇒ Object (readonly)

Returns the value of attribute secret.



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# File 'lib/intercom-rails/encrypted_mode.rb', line 3

def secret
  @secret
end

Instance Method Details

#encrypt(payload) ⇒ Object 



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# File 'lib/intercom-rails/encrypted_mode.rb', line 21

def encrypt(payload)
  return nil unless enabled
  payload = payload.except(*ENCRYPTED_MODE_SETTINGS_WHITELIST)
  key = Digest::SHA256.digest(secret)
  cipher = OpenSSL::Cipher.new('aes-256-gcm')
  cipher.encrypt
  cipher.key = key
  cipher.iv = initialization_vector
  json = ActiveSupport::JSON.encode(payload).gsub('<', '\u003C')
  encrypted = initialization_vector + cipher.update(json) + cipher.final + cipher.auth_tag
  Base64.encode64(encrypted).gsub("\n", "\\n")
end

#encrypted_javascript(payload) ⇒ Object 



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# File 'lib/intercom-rails/encrypted_mode.rb', line 17

def encrypted_javascript(payload)
  enabled ? "window.intercomEncryptedPayload = \"#{encrypt(payload)}\";" : ""
end

#plaintext_part(settings) ⇒ Object 



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# File 'lib/intercom-rails/encrypted_mode.rb', line 13

def plaintext_part(settings)
  enabled ? settings.slice(*ENCRYPTED_MODE_SETTINGS_WHITELIST) : settings
end