MessageVerifier
makes it easy to generate and verify messages
which are signed to prevent tampering.
This is useful for cases like remember-me tokens and auto-unsubscribe links where the session store isn’t suitable or available.
Remember Me:
cookies[:remember_me] = @verifier.generate([@user.id, 2.weeks.from_now])
In the authentication filter:
id, time = @verifier.verify(cookies[:remember_me]) if time < Time.now self.current_user = User.find(id) end
Namespace
Methods
Class Public methods
Source: show
# File activesupport/lib/active_support/message_verifier.rb, line 24 def initialize(secret, digest = 'SHA1') @secret = secret @digest = digest end
Instance Public methods
Source: show
# File activesupport/lib/active_support/message_verifier.rb, line 40 def generate(value) data = ActiveSupport::Base64.encode64s(Marshal.dump(value)) "#{data}--#{generate_digest(data)}" end
Source: show
# File activesupport/lib/active_support/message_verifier.rb, line 29 def verify(signed_message) raise InvalidSignature if signed_message.blank? data, digest = signed_message.split("--") if data.present? && digest.present? && secure_compare(digest, generate_digest(data)) Marshal.load(ActiveSupport::Base64.decode64(data)) else raise InvalidSignature end end