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178 lines
5.1 KiB
178 lines
5.1 KiB
<?php |
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/** |
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* An extension manager to load extensions present in EXTENSIONS_PATH. |
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*/ |
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class Minz_ExtensionManager { |
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private static $ext_metaname = 'metadata.json'; |
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private static $ext_entry_point = 'extension.php'; |
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private static $ext_list = array(); |
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private static $ext_list_enabled = array(); |
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private static $ext_auto_enabled = array(); |
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/** |
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* Initialize the extension manager by loading extensions in EXTENSIONS_PATH. |
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* |
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* A valid extension is a directory containing metadata.json and |
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* extension.php files. |
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* metadata.json is a JSON structure where the only required fields are |
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* `name` and `entry_point`. |
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* extension.php should contain at least a class named <name>Extension where |
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* <name> must match with the entry point in metadata.json. This class must |
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* inherit from Minz_Extension class. |
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*/ |
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public static function init() { |
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$list_potential_extensions = array_values(array_diff( |
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scandir(EXTENSIONS_PATH), |
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array('..', '.') |
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)); |
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self::$ext_auto_enabled = Minz_Configuration::extensionsEnabled(); |
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foreach ($list_potential_extensions as $ext_dir) { |
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$ext_pathname = EXTENSIONS_PATH . '/' . $ext_dir; |
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$metadata_filename = $ext_pathname . '/' . self::$ext_metaname; |
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// Try to load metadata file. |
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if (!file_exists($metadata_filename)) { |
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// No metadata file? Invalid! |
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continue; |
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} |
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$meta_raw_content = file_get_contents($metadata_filename); |
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$meta_json = json_decode($meta_raw_content, true); |
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if (!$meta_json || !self::is_valid_metadata($meta_json)) { |
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// metadata.json is not a json file? Invalid! |
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// or metadata.json is invalid (no required information), invalid! |
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Minz_Log::warning('`' . $metadata_filename . '` is not a valid metadata file'); |
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continue; |
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} |
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$meta_json['path'] = $ext_pathname; |
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// Try to load extension itself |
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$extension = self::load($meta_json); |
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if (!is_null($extension)) { |
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self::register($extension); |
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} |
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} |
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} |
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/** |
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* Indicates if the given parameter is a valid metadata array. |
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* |
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* Required fields are: |
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* - `name`: the name of the extension |
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* - `entry_point`: a class name to load the extension source code |
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* If the extension class name is `TestExtension`, entry point will be `Test`. |
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* `entry_point` must be composed of alphanumeric characters. |
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* |
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* @param $meta is an array of values. |
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* @return true if the array is valid, false else. |
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*/ |
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public static function is_valid_metadata($meta) { |
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return !(empty($meta['name']) || |
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empty($meta['entrypoint']) || |
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!ctype_alnum($meta['entrypoint'])); |
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} |
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/** |
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* Load the extension source code based on info metadata. |
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* |
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* @param $info an array containing information about extension. |
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* @return an extension inheriting from Minz_Extension. |
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*/ |
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public static function load($info) { |
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$entry_point_filename = $info['path'] . '/' . self::$ext_entry_point; |
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$ext_class_name = $info['entrypoint'] . 'Extension'; |
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include($entry_point_filename); |
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// Test if the given extension class exists. |
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if (!class_exists($ext_class_name)) { |
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Minz_Log::warning('`' . $ext_class_name . |
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'` cannot be found in `' . $entry_point_filename . '`'); |
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return null; |
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} |
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// Try to load the class. |
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$extension = null; |
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try { |
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$extension = new $ext_class_name($info); |
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} catch (Minz_ExtensionException $e) { |
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// We cannot load the extension? Invalid! |
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Minz_Log::warning('In `' . $metadata_filename . '`: ' . $e->getMessage()); |
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return null; |
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} |
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// Test if class is correct. |
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if (!($extension instanceof Minz_Extension)) { |
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Minz_Log::warning('`' . $ext_class_name . |
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'` is not an instance of `Minz_Extension`'); |
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return null; |
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} |
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return $extension; |
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} |
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/** |
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* Add the extension to the list of the known extensions ($ext_list). |
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* |
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* If the extension is present in $ext_auto_enabled and if its type is "system", |
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* it will be enabled in the same time. |
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* |
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* @param $ext a valid extension. |
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*/ |
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public static function register($ext) { |
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$name = $ext->getName(); |
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self::$ext_list[$name] = $ext; |
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if ($ext->getType() === 'system' && |
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in_array($name, self::$ext_auto_enabled)) { |
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self::enable($ext->getName()); |
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} |
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} |
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/** |
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* Enable an extension so it will be called when necessary. |
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* |
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* The extension init() method will be called. |
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* |
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* @param $ext_name is the name of a valid extension present in $ext_list. |
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*/ |
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public static function enable($ext_name) { |
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if (isset(self::$ext_list[$ext_name])) { |
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$ext = self::$ext_list[$ext_name]; |
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self::$ext_list_enabled[$ext_name] = $ext; |
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$ext->enable(); |
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$ext->init(); |
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} |
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} |
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/** |
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* Enable a list of extensions. |
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* |
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* @param $ext_list the names of extensions we want to load. |
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*/ |
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public static function enable_by_list($ext_list) { |
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foreach ($ext_list as $ext_name) { |
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self::enable($ext_name); |
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} |
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} |
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/** |
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* Returns a list of extensions. |
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* |
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* @param $only_enabled if true returns only the enabled extensions (false by default). |
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* @return an array of extensions. |
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*/ |
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public static function list_extensions($only_enabled = false) { |
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if ($only_enabled) { |
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return self::$ext_list_enabled; |
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} else { |
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return self::$ext_list; |
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} |
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} |
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}
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