关闭窗口时注销

Question

我的app中有restful_authentication。随之而来的是会话控制器。除了一件事，一切都在为我工作。当窗口关闭然后在同一台机器上重新打开时，将保存应用程序状态，包括登录用户。我需要我的应用程序在浏览器窗口关闭时将用户注销。但我不知道如何实现它。是否存在导致其保存的东西，或者我是否需要添加一些东西来杀死它？

这是会话控制器：

# This controller handles the login/logout function of the site.  
class SessionsController < ApplicationController

  # render new.rhtml
  def new
  end

  def create
    logout_keeping_session!
    user = User.authenticate(params[:login], params[:password])
    if user
      unless user.active?
        # ensures "deleted" users can't login
        user = nil
      end
    end
    if user
      # Protects against session fixation attacks, causes request forgery
      # protection if user resubmits an earlier form using back
      # button. Uncomment if you understand the tradeoffs.
      # reset_session
      self.current_user = user
      new_cookie_flag = (params[:remember_me] == "1")
      handle_remember_cookie! new_cookie_flag
      redirect_back_or_default('/')
    else
      note_failed_signin
      @login       = params[:login]
      @remember_me = params[:remember_me]
      render :action => 'new'
    end
  end

  def destroy
    logout_killing_session!
    redirect_back_or_default('/', :notice => "You have been logged out.")
  end

protected
  # Track failed login attempts
  def note_failed_signin
    flash.now[:alert] = "Couldn't log you in as '#{params[:login]}'"
    logger.warn "Failed login for '#{params[:login]}' from #{request.remote_ip} at #{Time.now.utc}"
  end
end

以下是authenticatedSystem模块（显然不相关的材料已移除）

module AuthenticatedSystem
  protected
    # Returns true or false if the user is logged in.
    # Preloads @current_user with the user model if they're logged in.
    def logged_in?
      !!current_user
    end

    # Accesses the current user from the session.
    # Future calls avoid the database because nil is not equal to false.
    def current_user
      @current_user ||= (login_from_session || login_from_basic_auth || login_from_cookie) unless @current_user == false
    end

    # Store the given user id in the session.
    def current_user=(new_user)
      session[:user_id] = new_user ? new_user.id : nil
      @current_user = new_user || false
    end


    def authorized?(action = action_name, resource = nil)
      logged_in?
    end


    def login_required
      authorized? || access_denied
    end


    def access_denied
      respond_to do |format|
        format.html do
          store_location
          redirect_to new_session_path
        end
        # format.any doesn't work in rails version < http://dev.rubyonrails.org/changeset/8987
        # Add any other API formats here.  (Some browsers, notably IE6, send Accept: */* and trigger 
        # the 'format.any' block incorrectly. See http://bit.ly/ie6_borken or http://bit.ly/ie6_borken2
        # for a workaround.)
        format.any(:json, :xml) do
          request_http_basic_authentication 'Web Password'
        end
      end
    end

    # Store the URI of the current request in the session.
    #
    # We can return to this location by calling #redirect_back_or_default.
    def store_location
      session[:return_to] = request.fullpath
    end

    # Redirect to the URI stored by the most recent store_location call or
    # to the passed default.  Set an appropriately modified
    #   after_filter :store_location, :only => [:index, :new, :show, :edit]
    # for any controller you want to be bounce-backable.
    def redirect_back_or_default(default, options = {})
      redirect_to((session[:return_to] || default), options)
      session[:return_to] = nil
    end

    # Inclusion hook to make #current_user and #logged_in?
    # available as ActionView helper methods.
    def self.included(base)
      base.send :helper_method, :current_user, :logged_in?, :authorized? if base.respond_to? :helper_method
    end

    #
    # Login
    #

    # Called from #current_user.  First attempt to login by the user id stored in the session.
    def login_from_session
      self.current_user = User.find_by_id(session[:user_id]) if session[:user_id]
    end

    # Called from #current_user.  Now, attempt to login by basic authentication information.
    def login_from_basic_auth
      authenticate_with_http_basic do |login, password|
        self.current_user = User.authenticate(login, password)
      end
    end

    #
    # Logout
    #

    # Called from #current_user.  Finaly, attempt to login by an expiring token in the cookie.
    # for the paranoid: we _should_ be storing user_token = hash(cookie_token, request IP)
    def login_from_cookie
      user = cookies[:auth_token] && User.find_by_remember_token(cookies[:auth_token])
      if user && user.remember_token?
        self.current_user = user
        handle_remember_cookie! false # freshen cookie token (keeping date)
        self.current_user
      end
    end

    # This is ususally what you want; resetting the session willy-nilly wreaks
    # havoc with forgery protection, and is only strictly necessary on login.
    # However, **all session state variables should be unset here**.
    def logout_keeping_session!
      # Kill server-side auth cookie
      @current_user.forget_me if @current_user.is_a? User
#      @current_user = false     # not logged in, and don't do it for me
      kill_remember_cookie!     # Kill client-side auth cookie
      session[:user_id] = nil   # keeps the session but kill our variable
      # explicitly kill any other session variables you set
    end

    # The session should only be reset at the tail end of a form POST --
    # otherwise the request forgery protection fails. It's only really necessary
    # when you cross quarantine (logged-out to logged-in).
    def logout_killing_session!
      logout_keeping_session!
      reset_session
    end

Answer 1

当您的浏览器（在我的情况下为Firefox）启动首选项设置为“从上次显示我的窗口和标签页”时，会发生这种情况。当关闭浏览器（所有窗口）时，“下次启动时保存选项卡”也会发生这种情况。在这些情况下，浏览器会记住sesssion，即它不会像通常那样删除会话cookie。

Answer 2

当用户重新打开浏览器时，您将通过cookie对其进行身份验证。尝试从

中删除login_from_cookie

def current_user
  @current_user ||= (login_from_session || login_from_basic_auth) unless @current_user == false
end