Developing Applications in Java

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Developing Applications
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6 The Basics of Creating Applications 7 Building the Canvas 8 Updating the Profile 9 Feed Stories, Feed Forms, and Templates 10 Publisher, Notifications, and Requests 11 FBJS, Mock AJAX, and Flash
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The Basics of Creating Applications
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his chapter covers the basics of creating and configuring a new Facebook application First, we cover the many configuration settings provided by the Facebook Developer application and how they should be set for a new application Next, we create the basic PHP skeleton of a Facebook application and introduce some of the functionality provided by Facebook Markup Language (FBML) and the official Facebook PHP client libraryThen, we discuss how applications are authorized by users and how Facebook authenticates applications Finally, Facebook sessions, signatures, and the data Facebook sends to an application s canvas page are covered In this chapter, you set up and create a sample application, ComplimentsThis application, which you will develop over the next several chapters, allows Facebook users to send compliments to their Facebook friends using all the integration points that Facebook provides
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Setting Up the Environment
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The first thing you need to do is download the Facebook PHP client library from Facebook from its public source control repository: http://svnfacebookcom/svnroot/platform/ clients/packages/facebook-platformtargzYou ll need to extract the files from the downloaded archive using your favorite archiving tool The PHP client library is comprised of three filesThe first, facebook_api_restlibphp, contains the implementation of the FacebookRestClient class that encapsulates the raw, low-level HTTP access of the Facebook REST-APIThe second file, facebookphp, provides an implementation of the Facebook class, which encapsulates Facebook web application behaviorThe third file, facebook_desktopphp, provides the FacebookDesktop class to do the same for Facebook desktop applications Both facebookphp and facebook_desktopphp include facebookapi_php5_restlibphp internally, so you never have to include it directly in your application code to access the Facebook API from PHP
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6 The Basics of Creating Applications
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Next, you need to set up a web server to host your application For the rest of this book, we refer to your web server in URLs, such as http://examplecom For the purposes of creating this application, it might be simplest to run on a local serverThere are also many hosting companies that specialize in Facebook application hosting Here are the steps to set up everything: 1 First, create a new directory on your web server for your application Create a new directory called Compliments to hold your application filesThis directory will be known as the application s root directory Next, create a new virtual directory, which maps to this physical directory Restart your web server 2 Now, install the Facebook PHP client library on your web server by extracting it to a location that the application can reference If you plan on writing multiple Facebook applications, you can either extract one copy of the PHP client library for each new application or use one global copy that will be referenced by all of your applicationsWe suggest the former because it limits compatibility errors that can arise if you update the library, and it breaks a feature in use by one of your older applicationsTo do this, extract the files to a new directory inside the compliments directory called fblibThe path to the facebookphp file should now be /compliments/fblib/facebookphp 3 Next, create the first file of your new Facebook application In the compliments directory create a new file called indexphp Put the following line in this file:
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< php phpinfo(); >
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4 To verify that your web server and new application are correctly set up, make sure that you can access the indexphp file from your web server Browse to the location of this new file using your favorite browser by typing http://examplecom/ compliments/indexphp in the browser s address bar You should now see the screen fill with information about the currently installed version of PHP Check your server s error logs for information if you cannot see the page or if your browser gives you an error 5 Finally, create a new MySQL database for the application called compliments For security purposes, it s good practice to create a new application-specific user for this database Ensure the user you choose for the Compliments application is granted the SELECT, ALTER, UPDATE, INSERT, and DELETE privileges for the new database Note this new user s username and passwordYou won t be using the database in this chapter, but you need it for 7, Building the Canvas
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