protect_from_forgery with :: exception在哪里？

Question

protect_from_forgery with: :exception工作怎么样？

我想编辑代码来查看它并从中学习.但是,我无法找到更高级别的抽象位置.

Answer 1

你可以在Github上找到它:https://github.com/rails/rails/blob/c60be72c5243c21303b067c9c5cc398111cf48c8/actionpack/lib/action_controller/metal/request_forgery_protection.rb#L88

def protect_from_forgery(options = {})
  self.forgery_protection_strategy = protection_method_class(options[:with] || :null_session)
  self.request_forgery_protection_token ||= :authenticity_token
  prepend_before_action :verify_authenticity_token, options
end

将with: :exception被传递给protection_method_class(:exception).这样做:

def protection_method_class(name)
  ActionController::RequestForgeryProtection::ProtectionMethods.const_get(name.to_s.classify)
  rescue NameError
  raise ArgumentError, 'Invalid request forgery protection method, use :null_session, :exception, or :reset_session'
end

然后这个ActionController::RequestForgeryProtection::ProtectionMethods.const_get(name.to_s.classify).name.to_s.classify这将是Exception.

然后你可以找到:

module ProtectionMethods
  class Exception
    def initialize(controller)
      @controller = controller
    end

    def handle_unverified_request
      raise ActionController::InvalidAuthenticityToken
    end
  end
end

所有这些都设置了处理无效真实性的方式.然后它设置before_action::verify_authenticity_token.

def verify_authenticity_token
  unless verified_request?
    logger.warn "Can't verify CSRF token authenticity" if logger
    handle_unverified_request
  end
end

其中使用了先前定义的策略:

def handle_unverified_request
  forgery_protection_strategy.new(self).handle_unverified_request
end

提出定义中的异常Exception.