footnotes/class/dashboard/init.php

<?php
/**
 * Includes the Plugin settings menu.
 *
 * @filesource
 * @author Stefan Herndler
 * @since  1.5.0 12.09.14 10:26
 */


/**
 * Handles the Settings interface of the Plugin.
 *
 * @author Stefan Herndler
 * @since  1.5.0
 */
class MCI_Footnotes_Layout_Init {

	/**
	 * Slug for the Plugin main menu.
	 *
	 * @author Stefan Herndler
	 * @since 1.5.0
	 * @var string
	 */
	const C_STR_MAIN_MENU_SLUG = "mfmmf";

	/**
	 * Plugin main menu name.
	 *
	 * @author Stefan Herndler
	 * @since 1.5.0
	 * @var string
	 */
	const C_STR_MAIN_MENU_TITLE = "ManFisher";

	/**
	 *
	 * @author Stefan Herndler
	 * @since 1.5.0
	 * @var array
	 */
	private $a_arr_SubPageClasses = array();

	/**
	 * Class Constructor. Initializes all WordPress hooks for the Plugin Settings.
	 *
	 * @author Stefan Herndler
	 * @since  1.5.0
	 */
	public function __construct() {
		// iterate through each class define in the current script
		foreach(get_declared_classes() as $l_str_ClassName) {
			// accept only child classes of the layout engine
			if(is_subclass_of($l_str_ClassName, 'MCI_Footnotes_LayoutEngine')) {
				/** @var MCI_Footnotes_LayoutEngine $l_obj_Class */
				$l_obj_Class = new $l_str_ClassName();
				// append new instance of the layout engine sub class
				$this->a_arr_SubPageClasses[$l_obj_Class->getPriority()] = $l_obj_Class;
			}
		}
		ksort($this->a_arr_SubPageClasses);

		// register hooks/actions
		add_action('admin_init', array($this, 'initializeSettings'));
		add_action('admin_menu', array($this, 'registerMainMenu'));
		// register AJAX callbacks for Plugin information
		add_action("wp_ajax_nopriv_footnotes_getPluginInfo", array($this, "getPluginMetaInformation"));
		add_action("wp_ajax_footnotes_getPluginInfo", array($this, "getPluginMetaInformation"));
	}

	/**
	 * Initializes all sub pages and registers the settings.
	 *
	 * @author Stefan Herndler
	 * @since  1.5.0
	 */
	public function initializeSettings() {
		MCI_Footnotes_Settings::instance()->RegisterSettings();
		// iterate though each sub class of the layout engine and register their sections
		/** @var MCI_Footnotes_LayoutEngine $l_obj_LayoutEngineSubClass */
		foreach($this->a_arr_SubPageClasses as $l_obj_LayoutEngineSubClass) {
			$l_obj_LayoutEngineSubClass->registerSections();
		}
	}

	/**
	 * Registers the new main menu for the WordPress dashboard.
	 * Registers all sub menu pages for the new main menu.
	 *
	 * @author Stefan Herndler
	 * @since  1.5.0
	 * @see http://codex.wordpress.org/Function_Reference/add_menu_page
	 */
	public function registerMainMenu() {
		global $menu;
		// iterate through each main menu
		foreach($menu as $l_arr_MainMenu) {
			// iterate through each main menu attribute
			foreach($l_arr_MainMenu as $l_str_Attribute) {
				// main menu already added, append sub pages and stop
				if ($l_str_Attribute == self::C_STR_MAIN_MENU_SLUG) {
					$this->registerSubPages();
					return;
				}
			}
		}

		// add a new main menu page to the WordPress dashboard
		add_menu_page(
			self::C_STR_MAIN_MENU_TITLE, // page title
			self::C_STR_MAIN_MENU_TITLE, // menu title
			'manage_options', // capability
			self::C_STR_MAIN_MENU_SLUG, // menu slug
			array($this, "displayOtherPlugins"), // function
			plugins_url('footnotes/img/main-menu.png'), // icon url
			null // position
		);
		$this->registerSubPages();
	}

	/**
	 * Registers all SubPages for this Plugin.
	 *
	 * @author Stefan Herndler
	 * @since 1.5.0
	 */
	private function registerSubPages() {
		// first registered sub menu page MUST NOT contain a unique slug suffix
		// iterate though each sub class of the layout engine and register their sub page
		/** @var MCI_Footnotes_LayoutEngine $l_obj_LayoutEngineSubClass */
		foreach($this->a_arr_SubPageClasses as $l_obj_LayoutEngineSubClass) {
			$l_obj_LayoutEngineSubClass->registerSubPage();
		}
	}

	/**
	 * Displays other Plugins from the developers.
	 *
	 * @author Stefan Herndler
	 * @since 1.5.0
	 */
	public function displayOtherPlugins() {
		printf("<br/><br/>");
		// load template file
		$l_obj_Template = new MCI_Footnotes_Template(MCI_Footnotes_Template::C_STR_DASHBOARD, "manfisher");
		echo $l_obj_Template->getContent();

		printf('<em>visit <a href="https://cheret.de/plugins/footnotes-2/" target="_blank">Mark Cheret</a></em>');
		printf("<br/><br/>");
		
		printf('</div>');
	}

	/**
	 * AJAX call. returns a JSON string containing meta information about a specific WordPress Plugin.
	 *
	 * @author Stefan Herndler
	 * @since 1.5.0
	 */
	public function getPluginMetaInformation() {
		// get plugin internal name from POST data
		$l_str_PluginName = array_key_exists("plugin", $_POST) ? $_POST["plugin"] : null;
		if (empty($l_str_PluginName)) {
			echo json_encode(array("error" => "Plugin name invalid."));
			exit;
		}
		$l_str_Url = "https://api.wordpress.org/plugins/info/1.0/".$l_str_PluginName.".json";
		// call URL and collect data
		$l_arr_Response = wp_remote_get($l_str_Url);
		// check if response is valid
		if (is_wp_error($l_arr_Response)) {
			echo json_encode(array("error" => "Error receiving Plugin Information from WordPress."));
			exit;
		}
		if (!array_key_exists("body", $l_arr_Response)) {
			echo json_encode(array("error" => "Error reading WordPress API response message."));
			exit;
		}
		// get the body of the response
		$l_str_Response = $l_arr_Response["body"];
		// get plugin object
		$l_arr_Plugin = json_decode($l_str_Response, true);
		if (empty($l_arr_Plugin)) {
			echo json_encode(array("error" => "Error reading Plugin meta information.<br/>URL: " . $l_str_Url . "<br/>Response: " . $l_str_Response));
			exit;
		}

        $l_int_NumRatings = array_key_exists("num_ratings", $l_arr_Plugin) ? intval($l_arr_Plugin["num_ratings"]) : 0;
        $l_int_Rating = array_key_exists("rating", $l_arr_Plugin) ? floatval($l_arr_Plugin["rating"]) : 0.0;
        $l_int_Stars = round(5 * $l_int_Rating / 100.0, 1);

		// return Plugin information as JSON encoded string
		echo json_encode(
			array(
				"error" => "",
				"PluginDescription" => array_key_exists("short_description", $l_arr_Plugin) ? html_entity_decode($l_arr_Plugin["short_description"]) : "Error reading Plugin information",
				"PluginAuthor" => array_key_exists("author", $l_arr_Plugin) ? html_entity_decode($l_arr_Plugin["author"]) : "unknown",
				"PluginRatingText" => $l_int_Stars . " " . __("rating based on", MCI_Footnotes_Config::C_STR_PLUGIN_NAME) . " " . $l_int_NumRatings . " " . __("ratings", MCI_Footnotes_Config::C_STR_PLUGIN_NAME),
                "PluginRating1" => $l_int_Stars >= 0.5 ? "star-full" : "star-empty",
                "PluginRating2" => $l_int_Stars >= 1.5 ? "star-full" : "star-empty",
                "PluginRating3" => $l_int_Stars >= 2.5 ? "star-full" : "star-empty",
                "PluginRating4" => $l_int_Stars >= 3.5 ? "star-full" : "star-empty",
                "PluginRating5" => $l_int_Stars >= 4.5 ? "star-full" : "star-empty",
                "PluginRating" => $l_int_NumRatings,
                "PluginLastUpdated" => array_key_exists("last_updated", $l_arr_Plugin) ? $l_arr_Plugin["last_updated"] : "unknown",
                "PluginDownloads" => array_key_exists("downloaded", $l_arr_Plugin) ? $l_arr_Plugin["downloaded"] : "---"
			)
		);
		exit;
	}
}