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Decrypt Rails 6.0 beta session cookies
require 'cgi'
require 'active_support'
def verify_and_decrypt_session_cookie(cookie, secret_key_base = Rails.application.secret_key_base)
config = Rails.application.config
cookie = CGI::unescape(cookie)
salt = config.action_dispatch.authenticated_encrypted_cookie_salt
encrypted_cookie_cipher = config.action_dispatch.encrypted_cookie_cipher || 'aes-256-gcm'
# serializer = ActiveSupport::MessageEncryptor::NullSerializer # use this line if you don't know your serializer
serializer = ActionDispatch::Cookies::JsonSerializer
key_generator = ActiveSupport::KeyGenerator.new(secret_key_base, iterations: 1000)
key_len = ActiveSupport::MessageEncryptor.key_len(encrypted_cookie_cipher)
secret = key_generator.generate_key(salt, key_len)
encryptor = ActiveSupport::MessageEncryptor.new(secret, cipher: encrypted_cookie_cipher, serializer: serializer)
session_key = config.session_options[:key].freeze
encryptor.decrypt_and_verify(cookie, purpose: "cookie.#{session_key}")
end
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