publisher_callbackphp: getPublisherError() Function in Java

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Listing 102 publisher_callbackphp: getPublisherError() Function
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/** Creates an error array to return to Facebook if the Publisher experiences an error */ function getPublisherError($msg) { return array( 'errorCode' => FACEBOOK_API_VALIDATION_ERROR,
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Listing 102
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'errorTitle' => 'Facebook Publisher Error', 'errorMessage'=> $msg );
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Listing 101 uses the getPublisherUI() function to provide the markup for the Publisher s user interface Facebook requests it after sending the publisher_getInterface POST variable getPublisherUI(), in turn, uses the getCSS() function to provide the styles for the Publisher Listing 103 shows the code for both of these functionsAdd these functions to the end of publisher_callbackphp
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Listing 103 publisher_callbackphp: Publisher User Interface Functions
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/** Returns the CSS for the Publisher interface */ function getCSS() { $css = " <style> h1 { font-size: 14px; font-weight:bold; text-align:center; margin-top:6px; margin-bottom:6px; } panel { text-align:center; background-color:#F7F7F7; padding:10px 0;} #complimentTable { margin: 5px auto; } #complimentTable textInput { width: 85%; } #complimentTable td { text-align:center; } category { float:left; height:75px; text-align:center; margin:8px; } category img { width:48px; height:48px; } category categoryTitle { height:20px; font-weight:bold; } </style>"; return $css; } /** Gets the Publisher's FBML markup */ function getPublisherUI( $uid ) { global $g_categories; $out = getCSS(); $out = " <div class='panel'> <form> <table id='complimentTable'> <tr> <td> <fb:if-is-friends-with-viewer uid='$uid' includeself='false'> <h1> <fb:name uid='$uid' firstnameonly='true' linked='false'/> is: </h1>
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Listing 103
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<fb:else> <h1> <fb:name uid='$uid' capitalize='true' linked='false'/> are: </h1> </fb:else> </fb:if-is-friends-with-viewer> </td> </tr> <tr> <td>"; foreach( $g_categories as $name => $info ){ $out = " <div class='category'> <img class='catImg' src='"LOCAL_APP_URL"/img/{$info['bigimg']}'/><br> <span class='categoryTitle'>{$info['title']}</span><br/> <input type='radio' name='category' value='$name'/> </div>"; } $out = " <div style='clear:both;'></div> </td> </tr> <tr> <td> <fb:if-is-friends-with-viewer uid='$uid' includeself='false'> <h1>because they:</h1> <fb:else> <h1>because you:</h1> </fb:else> </fb:if-is-friends-with-viewer> </td> </tr> <tr> <td> <input class='textInput' name='compliment' /> </td> </tr> </table> </form> </div>"; return $out; }
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The most important parts of the code in Listing 101 are the sections that deal with responding to the receipt of the method variable in the POST variables received from FacebookWhen the value of method is publisher_getInterface, your code must provide Facebook with a specific JSON response that provides it with the raw FBML that comprises the Publisher s user interface, as follows:
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if( 'publisher_getInterface' === $publisherAction ) { $markup = getPublisherUI($isSelfPub $publisher : $target); // The reponse to publisher_getInterface $fbResponse = array( 'content'=> array( 'fbml' => $markup, 'publishEnabled' => true ), 'method' => $publisherAction ); }
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The associative array stored in the $fbResponse variable will ultimately be JSONencoded before printing it back to Facebook, just like we did with the Feed form data in 9The first entry in the array must be named content and be set to an associative array itself containing two entries named fbml and publishEnabledThe first entry, fbml, must be set to the raw FBML that renders the Publisher interfaceThe final entry in the array must be named method and be set to the value for the method POST variable, which, in this case, is publisher_getInterface The publishEnabled value deserves a closer lookWhen it is set to true, the Share button is always enabled, and the user can submit the Publisher content immediately When it is set to false, the Share button is disabled until the application uses the FacebooksetPublishStatus() FBJS function to enable itThis manual enabling allows the application to perform client-side validation Our code sets it to true for simplicity; obviously, this would be unwise in production code that accepts user input, and we rectify that in 11, FBJS, Mock AJAX, and Flash When Facebook sets the value of the method POST variable to publisher_getFeedStory, it expects your code to return to it another specifically formatted JSON response containing the template data needed to produce the appropriate Feed story from the Publisher For Compliments, this callback happens after the user submits the Publisher form Listing 101 responds to this by storing the compliment in the database and then building the template dataThe following excerpt focuses on how the template data is created and returned:
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else if ( 'publisher_getFeedStory' === $publisherAction ) { $formValues = $_POST['app_params']; // elided for clarity $feed = array( 'template_id' => $isSelfPub TEMPLATE_BUNDLE_SELF_PUBLISH_1 : TEMPLATE_BUNDLE_OTHER_PUBLISH_1, 'template_data' => array( 'app' =>'<ahref="'FB_APP_URL'">Compliments</a>', 'ctitle' => $categoryInfo['title'], 'ctext' => $formValues['compliment'],
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