Module: ActiveRecord::SecureToken::ClassMethods

Defined in:
lib/active_record/secure_token.rb

Instance Method Summary collapse

Instance Method Details

#generate_unique_secure_token(length: MINIMUM_TOKEN_LENGTH) ⇒ Object 



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# File 'lib/active_record/secure_token.rb', line 61

def generate_unique_secure_token(length: MINIMUM_TOKEN_LENGTH)
  SecureRandom.base58(length)
end

#has_secure_token(attribute = :token, length: MINIMUM_TOKEN_LENGTH, on: ActiveRecord.generate_secure_token_on) ⇒ Object

Example using #has_secure_token

# Schema: User(token:string, auth_token:string)
class User < ActiveRecord::Base
has_secure_token
has_secure_token :auth_token, length: 36
end

user = User.new
user.save
user.token # => "pX27zsMN2ViQKta1bGfLmVJE"
user.auth_token # => "tU9bLuZseefXQ4yQxQo8wjtBvsAfPc78os6R"
user.regenerate_token # => true
user.regenerate_auth_token # => true

SecureRandom::base58 is used to generate at minimum a 24-character unique token, so collisions are highly unlikely.

Note that it's still possible to generate a race condition in the database in the same way that validates_uniqueness_of can. You're encouraged to add a unique index in the database to deal with this even more unlikely scenario.

Options

[+:length+] Length of the Secure Random, with a minimum of 24 characters. It will default to 24.

[+:on+] The callback when the value is generated. When called with on:

:initialize</tt>, the value is generated in an
<tt>after_initialize</tt> callback, otherwise the value will be used
in a <tt>before_</tt> callback. When not specified, +:on+ will use the value of
<tt>config.active_record.generate_secure_token_on</tt>, which defaults to +:initialize+
starting in \Rails 7.1.


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# File 'lib/active_record/secure_token.rb', line 46

def has_secure_token(attribute = :token, length: MINIMUM_TOKEN_LENGTH, on: ActiveRecord.generate_secure_token_on)
  if length < MINIMUM_TOKEN_LENGTH
    raise MinimumLengthError, "Token requires a minimum length of #{MINIMUM_TOKEN_LENGTH} characters."
  end

  # Load securerandom only when has_secure_token is used.
  require "active_support/core_ext/securerandom"
  define_method("regenerate_#{attribute}") { update! attribute => self.class.generate_unique_secure_token(length: length) }
  set_callback on, on == :initialize ? :after : :before do
    if new_record? && !query_attribute(attribute)
      send("#{attribute}=", self.class.generate_unique_secure_token(length: length))
    end
  end
end