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end # Make logged_in available in templates as a helper helper_method :logged_in def access_denied redirect_to login_path, :notice => "Please log in to continue" and return false end end The current_user method acts like an accessor for the currently logged-in user. Because it returns a User object, you can call instance methods of User on it, such as current_user.email. The authenticate method is your filter method (the one you call from individual controllers). It checks whether there is a currently logged-in user via logged_in (which, in turn, checks that there is actually a User returned by current_user) and calls access_denied if there isn t. access_denied redirects to the login_path in the sessions controller with a notice message in the flash. You want two of these methods available in templates as well: logged_in and current_user. Having logged_in available allows you to make dynamic decisions about whether a user is logged in. You can use this to show or hide administrative controls (such as adding or editing a given article). Having current_user around also proves useful in templates, allowing you to access information about users, such as their email address. Rails provides a handy way to extend the visibility of methods to templates by declaring them as helpers. You can use helper_method followed by a symbolic reference to the method in question, as you do in helper_method :logged_in . You can also pass an array of method references to helper_method if you want to declare them all at once. Let s apply the filter to the articles controller now. You also apply a filter to the users controller to restrict who can edit user profiles.
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You apply filters using a declarative syntax. In this case, you want to check that a user is authenticated before you process a protected action, so you use before_filter. Add the filter to the articles controller, just inside the class body, as shown in Listing 7-24. Listing 7-24. Before Filter Added in app/controllers/articles_controller.rb: http://gist.github.com/341628 class ArticlesController < ApplicationController before_filter :authenticate, :except => [:index, :show] #... end Notice how you re able to selectively apply the filter to specific actions. Here, you want every action to be protected except index and show. The :except modifier accepts either a single value or an array. You use an array here. If you want to protect only a few actions, you can use the :only modifier, which, as you would expect, behaves the opposite of :except. You also want to use a filter in the users controller. Right now, anyone can edit a user as long as they know the user id. This would be risky in the real world. Ideally, you want the edit and update actions to
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respond only to the currently logged-in user, allowing that user to edit their profile. To do this, instead of retrieving User.find(params[:id]), you retrieve current_user and apply a filter to protect the edit and update actions. Listing 7-25 shows the latest version of the users controller; the updated code is highlighted in bold. Listing 7-25. Before Filter Added in app/controllers/users_controller.rb: http://gist.github.com/341632 class UsersController < ApplicationController before_filter :authenticate, :only => [:edit, :update] def new @user = User.new end def create @user = User.new(params[:user]) if @user.save redirect_to articles_path, :notice => 'User successfully added.' else render :action => 'new' end end def edit @user = current_user end def update @user = current_user if @user.update_attributes(params[:user]) redirect_to articles_path, :notice => 'Updated user information successfully.' else render :action => 'edit' end end end Try it. If you attempt to add, edit, or delete an article, you re asked to log in (see Figure 7-7).
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Figure 7-7. Authentication required You don t want to keep deleting a comment as a public task; therefore, authorization code is required in the comments controller. First, you add a before_filter to authorize users before calling the destroy action. Next, in the destroy action, you find the article, making sure it belongs to the current user by using current_user.articles.find. Then, you find the comment on that article; and finally, you destroy it. Listing 7-26 shows the updated code for the comments controller. Listing 7-26. Authorization Before Deleting a Comment in app/controllers/comments_controller.rb: http://gist.github.com/388584 class CommentsController < ApplicationController before_filter :load_article, :except => :destroy before_filter :authenticate, :only => :destroy def create @comment = @article.comments.new(params[:comment]) if @comment.save redirect_to @article, :notice => 'Thanks for your comment' else redirect_to @article, :alert => 'Unable to add comment' end end
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