Creating the Application Skeleton in Java

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We ll now begin coding the Compliments applicationWe ll start with a simple PHP skeleton that will implement just the basics of integrating with Facebook by handling application authorization and removalWe ll go over each part of it in detail From the Developer application, we ll need the API key, Secret key, and Canvas Callback URLWe ll create a file that sets these to constant values that we can include in all the files of the application Create a new file named globalsinc and save it in a subdirectory of your application root directory, named inc In this file, enter the code shown in Listing 61, replacing the name, key, and callback URL values with the ones you previously copied
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Listing 61 globalsinc: PHP to Set Global Constants
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< php require_once dirname(__FILE__)'//fblib/facebookphp'; // Facebook API Key define('FB_API_KEY', '<fill in your app api key>'); // Facebook Secret Key define('FB_APP_SECRET', '<fill in your app secret key>'); // Application name define('FB_APP_NAME', '<fill in your canvas page url application name>'); // root URL of application on Facebook define('FB_APP_URL', Facebook::get_facebook_url('apps')'/'FB_APP_NAME); // local application root URL define('LOCAL_APP_URL', '<fill in your application web root>/'FB_APP_NAME); >
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This file houses all the constant and global values we will need throughout the Compliments application as it s developedThe first thing we do is reference the Facebook library by including the Facebook PHP Library s web application code, found in facebookphpThis allows us to access all the types needed to communicate with Facebook from any page in our application that includes globalsinc Next, we define a set of constants that will be frequently used in the application code Note that we use the Facebook::get_facebook_url() method from the Facebook PHP client library to ensure that we get the Facebook URL defined by the PHP client library rather than hardcoding it Note
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For ease of explanation and code organization, we place globalsinc in a subdirectory of the web server s document root For security reasons, you would most likely not do this on a production web server Be sure you secure this and all other files that you do not want to be accessible via a browser using any and all means your web-server software supports!
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Next, open the indexphp file you created in your application s root directory and include the code in Listing 62
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Listing 62
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< php require_once 'inc/globalsinc'; $facebook = new Facebook(FB_API_KEY, FB_APP_SECRET); if( isset( $facebook->fb_params['authorized'] ) ) { // do new user initialization } else if ( isset($facebook->fb_params['uninstall'] ) ) { // do user cleanup } else { if( ! $facebook->api_client->added ) { // handle non-app users by giving them a link to add the application echo "<p>Hello, non-app user!</p> <a href='"$facebook->get_add_url()"'> Click here to add this application</a>"; } else { echo "<p>Hello, app user <fb:name uid='{$facebook->user}' useyou='false' />!</p>"; } } > indexphp is our first application canvas pageAlthough it s simple, this code accomplishes several complex tasks, including creating an instance of the Facebook object,
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Creating the Application Skeleton
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handling application authorization and removal, and rendering content to both users and non-users of the application First, we include the globalsinc file created in Listing 61This gives us access to the API key and Secret keyThese are important because they are required parameters of the Facebook class constructor Creating an instance of this class grants our application the capability to call the API through the PHP client libraryThankfully, the library handles all the necessary application authentication code that grants this access The next block handles the ping that Facebook sends to the Post-Authorize Callback URL we set in the Authentication Settings tab of the Developer application Currently, this block does nothing, but as the comment in the code suggests, this is where we can do any initialization or setup of a new user that did not require rendering anything to the browser (remember, it s a ping, not a redirection) For example, we could create a new user account in a database, store the time the application was installed for this user, or do any user-specific application setup that did not require visible outputWe use the Facebook class fb_params collection to check if the fb_sig_authorize POST variable was sent to the pageThis variable is sent when Facebook pings your Post-Authorize Callback URLWe discuss this in the section, Application Authorization We then check for application removal requestsAs mentioned previously, Facebook pings the application s Post-Remove Callback URL when a user removes an application This time, we check for the fb_sig_uninstall POST variable In this block, we would perform any user-specific application cleanup required, like removing a user account from a database, recording the application removal time, or determining how long this user had the application installedAs with the post-authorization code, this code should not try to render anything to the browser, because it will never be seen by the user Finally, we handle the actual rendering of the canvas page to both users who have authorized the application and those who have notThis is a critical point to understand: Users do not have to install an application to view canvas page content, and an application needs to provide at least some level of content to all Facebook users, whether or not they have authorized it In fact, as a best practice, Facebook suggests that you only require a user to authorize your application when it provides enough value to the user to warrant it, as discussed in 2 We check the $facebook->api_client->added property to determine if the current Facebook user viewing the canvas page has authorized the application Note that we use the api_client property of the Facebook instance to get access to addedThe api_client property wraps an instance of the FacebookRestClient class that we mentioned at the beginning of this chapter If they have not authorized the application, we render a welcome message and a link to the application s authorization page (provided by the Facebook::get_add_url() method) Figure 612 shows what a user who has not authorized the application sees when he first visits the rudimentary Compliments canvas pageWhen that user clicks the Click Here to Add This Application link, he is automatically directed to the Compliments application authorization page, shown in Figure 613
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