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Now that we have a simple login form, our next task for limiting access is implementing a way to determine if the submitted password is the correct one. Since the needs of our application are pretty simple, we can do this by simply comparing what s in the session variable with the correct password in a method like this: def admin session[:password] == "my_ultra_secret_password" end Being merely a comparison check between two values, our admin method will return either true or false, depending on whether or not the passwords match. Doing it this way means that anywhere we need to limit access, we can now simply ask the question, if admin Now, the question is, where do we put our new admin method If we were going to build a user model, I would probably recommend adding this method within that user model, so that we could query the administrative status of a specific user: joe = User.find(params[:id]) if joe.admin // allow joe to do adminy type stuff else // stop it joe!! end But we don t need anything that granular all we require is a simple way to see if the person requesting the page access knows the current password. Because of that, I recommend placing the method in your application_controller (/app/controllers/application.rb) so that our admin method can be called from any controller: class ApplicationController < ActionController::Base session :session_key => '_webcomic_session_id' protected def admin session[:password] == "my_ultra_secret_password" end end

<rect x="200" y="200" width="400" height="400" fill="#FF0000" stroke-width="1" stroke="#000000" />

If you re not a programmer, you ll still be able to download the source code for the finished product and give it a go We ve also arranged the code so that the portion that actually uses MythTV is as small as possible and separate from the infrastructure needed to make it work, which means you can ignore the infrastructure code if you want First you ll learn how to make MythTV display on-screen text from the command line..

Immediately you ll notice that rectangles have a height and width just like the <svg> container node. SVG reuses attribute names whenever possible. The notion of x and y positional attributes should be familiar. The rectangle shown in Figure 3-1 sits right in the middle of the image.

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Tip If we needed to be able to call our new admin method from within one our view templates, we could

Figure 3-1. A rectangle defined with SVG You can use hex notation to color your images. The fill attribute sets the body color, and the stroke attribute sets the border color for the rectangle. And finally, the stroke-width attribute sets the width of the border to 1.

MythTV can display on-screen text as long as there is a recording or Live TV playing. In other words, it won t work if you re watching a show with something other than the MythTV internal player, and it won t work if you re currently in the menu system. With those limitations in mind,

With hex color notation, the first two digits of the hex number represent the red value (#FF0000), the Tip

simply add a helper_method :admin line command within our application controller; this would conveniently make our controller method accessible as a helper method as well.

second two represent the blue value (#00FF00), and the third represents the green (#0000FF). Black contains no red, no green, and no blue (#000000), and white has the full values of all (#FFFFFF). Other colors can be created by varying the values of each color. For example, #FF33CC produces a strange magenta color.

it s actually a useful feature. Common uses for on-screen displays include displaying caller ID information for incoming phone calls, warning the user about error conditions such as being low on disk space, and informing the user of waiting email. Figure 13-1 shows an example of an on-screen display.

SVG has an enormous number of node types you can use to draw images. A full list can be found in the SVG specifications. The most recent nondraft specification is version 1.1, which is available at www.w3.org/TR/SVG11/.

Let s use our new admin method to limit access to our administration section. We can do this easily by adding a before filter into our comics controller that verifies that only an administrator can access its methods: class ComicsController < ApplicationController before_filter :verify_admin (ommitted code) end Now, down at the bottom of our comics controller, we ll add a protected block where we ll build our verify_admin method to redirect users to the login form if they re not administrators: class ComicsController < ApplicationController before_filter :verify_admin (ommitted code) protected def verify_admin unless admin redirect_to login_path return false end true end end All that s left is to expand the create method in our sessions controller (/app/controllers/ sessions_controller.rb) to check that the submitted password and display an error message if the password doesn t match: def create session[:password] = params[:password] if admin redirect_to comics_path else flash[:notice] = "That password was incorrect" redirect_to login_path end end

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