sion', 'homepage', 'tested',
		'download_url', 'upgrade_notice', 'filename',
		'translations'
	);

	/**
	 * Create a new instance of PluginUpdate from its JSON-encoded representation.
	 *
	 * @param string $json
	 * @return PluginUpdate_3_1|null
	 */
	public static function fromJson($json){
		//Since update-related information is simply a subset of the full plugin info,
		//we can parse the update JSON as if it was a plugin info string, then copy over
		//the parts that we care about.
		$pluginInfo = PluginInfo_3_1::fromJson($json);
		if ( $pluginInfo != null ) {
			return self::fromPluginInfo($pluginInfo);
		} else {
			return null;
		}
	}

	/**
	 * Create a new instance of PluginUpdate based on an instance of PluginInfo.
	 * Basically, this just copies a subset of fields from one object to another.
	 *
	 * @param PluginInfo_3_1 $info
	 * @return PluginUpdate_3_1
	 */
	public static function fromPluginInfo($info){
		return self::fromObject($info);
	}

	/**
	 * Create a new instance of PluginUpdate by copying the necessary fields from
	 * another object.
	 *
	 * @param StdClass|PluginInfo_3_1|PluginUpdate_3_1 $object The source object.
	 * @return PluginUpdate_3_1 The new copy.
	 */
	public static function fromObject($object) {
		$update = new self();
		$fields = self::$fields;
		if ( !empty($object->slug) ) {
			$fields = apply_filters('puc_retain_fields-' . $object->slug, $fields);
		}
		foreach($fields as $field){
			if (property_exists($object, $field)) {
				$update->$field = $object->$field;
			}
		}
		return $update;
	}

	/**
	 * Create an instance of StdClass that can later be converted back to
	 * a PluginUpdate. Useful for serialization and caching, as it avoids
	 * the "incomplete object" problem if the cached value is loaded before
	 * this class.
	 *
	 * @return StdClass
	 */
	public function toStdClass() {
		$object = new stdClass();
		$fields = self::$fields;
		if ( !empty($this->slug) ) {
			$fields = apply_filters('puc_retain_fields-' . $this->slug, $fields);
		}
		foreach($fields as $field){
			if (property_exists($this, $field)) {
				$object->$field = $this->$field;
			}
		}
		return $object;
	}


	/**
	 * Transform the update into the format used by WordPress native plugin API.
	 *
	 * @return object
	 */
	public function toWpFormat(){
		$update = new stdClass;

		$update->id = $this->id;
		$update->slug = $this->slug;
		$update->new_version = $this->version;
		$update->url = $this->homepage;
		$update->package = $this->download_url;
		$update->tested = $this->tested;
		$update->plugin = $this->filename;

		if ( !empty($this->upgrade_notice) ){
			$update->upgrade_notice = $this->upgrade_notice;
		}

		return $update;
	}
}

endif;

if ( !class_exists('PucScheduler_3_1', false) ):

/**
 * The scheduler decides when and how often to check for updates.
 * It calls @see PluginUpdateChecker::checkForUpdates() to perform the actual checks.
 *
 * @version 3.0
 */
class PucScheduler_3_1 {
	public $checkPeriod = 12; //How often to check for updates (in hours).
	public $throttleRedundantChecks = false; //Check less often if we already know that an update is available.
	public $throttledCheckPeriod = 72;

	/**
	 * @var PluginUpdateChecker_3_1
	 */
	protected $updateChecker;

	private $cronHook = null;

	/**
	 * Scheduler constructor.
	 *
	 * @param PluginUpdateChecker_3_1 $updateChecker
	 * @param int $checkPeriod How often to check for updates (in hours).
	 */
	public function __construct($updateChecker, $checkPeriod) {
		$this->updateChecker = $updateChecker;
		$this->checkPeriod = $checkPeriod;

		//Set up the periodic update checks
		$this->cronHook = 'check_plugin_updates-' . $this->updateChecker->slug;
		if ( $this->checkPeriod > 0 ){

			//Trigger the check via Cron.
			//Try to use one of the default schedules if possible as it's less likely to conflict
			//with other plugins and their custom schedules.
			$defaultSchedules = array(
				1  => 'hourly',
				12 => 'twicedaily',
				24 => 'daily',
			);
			if ( array_key_exists($this->checkPeriod, $defaultSchedules) ) {
				$scheduleName = $defaultSchedules[$this->checkPeriod];
			} else {
				//Use a custom cron schedule.
				$scheduleName = 'every' . $this->checkPeriod . 'hours';
				add_filter('cron_schedules', array($this, '_addCustomSchedule'));
			}

			if ( !wp_next_scheduled($this->cronHook) && !defined('WP_INSTALLING') ) {
				wp_schedule_event(time(), $scheduleName, $this->cronHook);
			}
			add_action($this->cronHook, array($this, 'maybeCheckForUpdates'));

			register_deactivation_hook($this->updateChecker->pluginFile, array($this, '_removeUpdaterCron'));

			//In case Cron is disabled or unreliable, we also manually trigger
			//the periodic checks while the user is browsing the Dashboard.
			add_action( 'admin_init', array($this, 'maybeCheckForUpdates') );

			//Like WordPress itself, we check more often on certain pages.
			/** @see wp_update_plugins */
			add_action('load-update-core.php', array($this, 'maybeCheckForUpdates'));
			add_action('load-plugins.php', array($this, 'maybeCheckForUpdates'));
			add_action('load-update.php', array($this, 'maybeCheckForUpdates'));
			//This hook fires after a bulk update is complete.
			add_action('upgrader_process_complete', array($this, 'maybeCheckForUpdates'), 11, 0);

		} else {
			//Periodic checks are disabled.
			wp_clear_scheduled_hook($this->cronHook);
		}
	}

	/**
	 * Check for updates if the configured check interval has already elapsed.
	 * Will use a shorter check interval on certain admin pages like "Dashboard -> Updates" or when doing cron.
	 *
	 * You can override the default behaviour by using the "puc_check_now-$slug" filter.
	 * The filter callback will be passed three parameters:
	 *     - Current decision. TRUE = check updates now, FALSE = don't check now.
	 *     - Last check time as a Unix timestamp.
	 *     - Configured check period in hours.
	 * Return TRUE to check for updates immediately, or FALSE to cancel.
	 *
	 * This method is declared public because it's a hook callback. Calling it directly is not recommended.
	 */
	public function maybeCheckForUpdates(){
		if ( empty($this->checkPeriod) ){
			return;
		}

		$state = $this->updateChecker->getUpdateState();
		$shouldCheck =
			empty($state) ||
			!isset($state->lastCheck) ||
			( (time() - $state->lastCheck) >= $this->getEffectiveCheckPeriod() );

		//Let plugin authors substitute their own algorithm.
		$shouldCheck = apply_filters(
			'puc_check_now-' . $this->updateChecker->slug,
			$shouldCheck,
			(!empty($state) && isset($state->lastCheck)) ? $state->lastCheck : 0,
			$this->checkPeriod
		);

		if ( $shouldCheck ) {
			$this->updateChecker->checkForUpdates();
		}
	}

	/**
	 * Calculate the actual check period based on the current status and environment.
	 *
	 * @return int Check period in seconds.
	 */
	protected function getEffectiveCheckPeriod() {
		$currentFilter = current_filter();
		if ( in_array($currentFilter, array('load-update-core.php', 'upgrader_process_complete')) ) {
			//Check more often when the user visits "Dashboard -> Updates" or does a bulk update.
			$period = 60;
		} else if ( in_array($currentFilter, array('load-plugins.php', 'load-update.php')) ) {
			//Also check more often on the "Plugins" page and /wp-admin/update.php.
			$period = 3600;
		} else if ( $this->throttleRedundantChecks && ($this->updateChecker->getUpdate() !== null) ) {
			//Check less frequently if it's already known that an update is available.
			$period = $this->throttledCheckPeriod * 3600;
		} else if ( defined('DOING_CRON') && constant('DOING_CRON') ) {
			//WordPress cron schedules are not exact, so lets do an update check even
			//if slightly less than $checkPeriod hours have elapsed since the last check.
			$cronFuzziness = 20 * 60;
			$period = $this->checkPeriod * 3600 - $cronFuzziness;
		} else {
			$period = $this->checkPeriod * 3600;
		}

		return $period;
	}

	/**
	 * Add our custom schedule to the array of Cron schedules used by WP.
	 *
	 * @param array $schedules
	 * @return array
	 */
	public function _addCustomSchedule($schedules){
		if ( $this->checkPeriod && ($this->checkPeriod > 0) ){
			$scheduleName = 'every' . $this->checkPeriod . 'hours';
			$schedules[$scheduleName] = array(
				'interval' => $this->checkPeriod * 3600,
				'display' => sprintf('Every %d hours', $this->checkPeriod),
			);
		}
		return $schedules;
	}

	/**
	 * Remove the scheduled cron event that the library uses to check for updates.
	 *
	 * @return void
	 */
	public function _removeUpdaterCron(){
		wp_clear_scheduled_hook($this->cronHook);
	}

	/**
	 * Get the name of the update checker's WP-cron hook. Mostly useful for debugging.
	 *
	 * @return string
	 */
	public function getCronHookName() {
		return $this->cronHook;
	}
}

endif;


if ( !class_exists('PucUpgraderStatus_3_1', false) ):

/**
 * A utility class that helps figure out which plugin WordPress is upgrading.
 *
 * It may seem strange to have an separate class just for that, but the task is surprisingly complicated.
 * Core classes like Plugin_Upgrader don't expose the plugin file name during an in-progress update (AFAICT).
 * This class uses a few workarounds and heuristics to get the file name.
 */
class PucUpgraderStatus_3_1 {
	private $upgradedPluginFile = null; //The plugin that is currently being upgraded by WordPress.

	public function __construct() {
		//Keep track of which plugin WordPress is currently upgrading.
		add_filter('upgrader_pre_install', array($this, 'setUpgradedPlugin'), 10, 2);
		add_filter('upgrader_package_options', array($this, 'setUpgradedPluginFromOptions'), 10, 1);
		add_filter('upgrader_post_install', array($this, 'clearUpgradedPlugin'), 10, 1);
		add_action('upgrader_process_complete', array($this, 'clearUpgradedPlugin'), 10, 1);
	}

	/**
	 * Is there and update being installed RIGHT NOW, for a specific plugin?
	 *
	 * Caution: This method is unreliable. WordPress doesn't make it easy to figure out what it is upgrading,
	 * and upgrader implementations are liable to change without notice.
	 *
	 * @param string $pluginFile The plugin to check.
	 * @param WP_Upgrader|null $upgrader The upgrader that's performing the current update.
	 * @return bool True if the plugin identified by $pluginFile is being upgraded.
	 */
	public function isPluginBeingUpgraded($pluginFile, $upgrader = null) {
		if ( isset($upgrader) ) {
			$upgradedPluginFile = $this->getPluginBeingUpgradedBy($upgrader);
			if ( !empty($upgradedPluginFile) ) {
				$this->upgradedPluginFile = $upgradedPluginFile;
			}
		}
		return ( !empty($this->upgradedPluginFile) && ($this->upgradedPluginFile === $pluginFile) );
	}

	/**
	 * Get the file name of the plugin that's currently being upgraded.
	 *
	 * @param Plugin_Upgrader|WP_Upgrader $upgrader
	 * @return string|null
	 */
	private function getPluginBeingUpgradedBy($upgrader) {
		if ( !isset($upgrader, $upgrader->skin) ) {
			return null;
		}

		//Figure out which plugin is being upgraded.
		$pluginFile = null;
		$skin = $upgrader->skin;
		if ( $skin instanceof Plugin_Upgrader_Skin ) {
			if ( isset($skin->plugin) && is_string($skin->plugin) && ($skin->plugin !== '') ) {
				$pluginFile = $skin->plugin;
			}
		} elseif ( isset($skin->plugin_info) && is_array($skin->plugin_info) ) {
			//This case is tricky because Bulk_Plugin_Upgrader_Skin (etc) doesn't actually store the plugin
			//filename anywhere. Instead, it has the plugin headers in $plugin_info. So the best we can
			//do is compare those headers to the headers of installed plugins.
			$pluginFile = $this->identifyPluginByHeaders($skin->plugin_info);
		}

		return $pluginFile;
	}

	/**
	 * Identify an installed plugin based on its headers.
	 *
	 * @param array $searchHeaders The plugin file header to look for.
	 * @return string|null Plugin basename ("foo/bar.php"), or NULL if we can't identify the plugin.
	 */
	private function identifyPluginByHeaders($searchHeaders) {
		if ( !function_exists('get_plugins') ){
			/** @noinspection PhpIncludeInspection */
			require_once( ABSPATH . '/wp-admin/includes/plugin.php' );
		}

		$installedPlugins = get_plugins();
		$matches = array();
		foreach($installedPlugins as $pluginBasename => $headers) {
			$diff1 = array_diff_assoc($headers, $searchHeaders);
			$diff2 = array_diff_assoc($searchHeaders, $headers);
			if ( empty($diff1) && empty($diff2) ) {
				$matches[] = $pluginBasename;
			}
		}

		//It's possible (though very unlikely) that there could be two plugins with identical
		//headers. In that case, we can't unambiguously identify the plugin that's being upgraded.
		if ( count($matches) !== 1 ) {
			return null;
		}

		return reset($matches);
	}

	/**
	 * @access private
	 *
	 * @param mixed $input
	 * @param array $hookExtra
	 * @return mixed Returns $input unaltered.
	 */
	public function setUpgradedPlugin($input, $hookExtra) {
		if (!empty($hookExtra['plugin']) && is_string($hookExtra['plugin'])) {
			$this->upgradedPluginFile = $hookExtra['plugin'];
		} else {
			$this->upgradedPluginFile = null;
		}
		return $input;
	}

	/**
	 * @access private
	 *
	 * @param array $options
	 * @return array
	 */
	public function setUpgradedPluginFromOptions($options) {
		if (isset($options['hook_extra']['plugin']) && is_string($options['hook_extra']['plugin'])) {
			$this->upgradedPluginFile = $options['hook_extra']['plugin'];
		} else {
			$this->upgradedPluginFile = null;
		}
		return $options;
	}

	/**
	 * @access private
	 *
	 * @param mixed $input
	 * @return mixed Returns $input unaltered.
	 */
	public function clearUpgradedPlugin($input = null) {
		$this->upgradedPluginFile = null;
		return $input;
	}
}

endif;


if ( !class_exists('PucFactory', false) ):

/**
 * A factory that builds instances of other classes from this library.
 *
 * When multiple versions of the same class have been loaded (e.g. PluginUpdateChecker 1.2
 * and 1.3), this factory will always use the latest available version. Register class
 * versions by calling {@link PucFactory::addVersion()}.
 *
 * At the moment it can only build instances of the PluginUpdateChecker class. Other classes
 * are intended mainly for internal use and refer directly to specific implementations. If you
 * want to instantiate one of them anyway, you can use {@link PucFactory::getLatestClassVersion()}
 * to get the class name and then create it with <code>new $class(...)</code>.
 */
class PucFactory {
	protected static $classVersions = array();
	protected static $sorted = false;

	/**
	 * Create a new instance of PluginUpdateChecker.
	 *
	 * @see PluginUpdateChecker::__construct()
	 *
	 * @param $metadataUrl
	 * @param $pluginFile
	 * @param string $slug
	 * @param int $checkPeriod
	 * @param string $optionName
	 * @param string $muPluginFile
	 * @return PluginUpdateChecker_3_1
	 */
	public static function buildUpdateChecker($metadataUrl, $pluginFile, $slug = '', $checkPeriod = 12, $optionName = '', $muPluginFile = '') {
		$class = self::getLatestClassVersion('PluginUpdateChecker');
		return new $class($metadataUrl, $pluginFile, $slug, $checkPeriod, $optionName, $muPluginFile);
	}

	/**
	 * Get the specific class name for the latest available version of a class.
	 *
	 * @param string $class
	 * @return string|null
	 */
	public static function getLatestClassVersion($class) {
		if ( !self::$sorted ) {
			self::sortVersions();
		}

		if ( isset(self::$classVersions[$class]) ) {
			return reset(self::$classVersions[$class]);
		} else {
			return null;
		}
	}

	/**
	 * Sort available class versions in descending order (i.e. newest first).
	 */
	protected static function sortVersions() {
		foreach ( self::$classVersions as $class => $versions ) {
			uksort($versions, array(__CLASS__, 'compareVersions'));
			self::$classVersions[$class] = $versions;
		}
		self::$sorted = true;
	}

	protected static function compareVersions($a, $b) {
		return -version_compare($a, $b);
	}

	/**
	 * Register a version of a class.
	 *
	 * @access private This method is only for internal use by the library.
	 *
	 * @param string $generalClass Class name without version numbers, e.g. 'PluginUpdateChecker'.
	 * @param string $versionedClass Actual class name, e.g. 'PluginUpdateChecker_1_2'.
	 * @param string $version Version number, e.g. '1.2'.
	 */
	public static function addVersion($generalClass, $versionedClass, $version) {
		if ( !isset(self::$classVersions[$generalClass]) ) {
			self::$classVersions[$generalClass] = array();
		}
		self::$classVersions[$generalClass][$version] = $versionedClass;
		self::$sorted = false;
	}
}

endif;

require_once(dirname(__FILE__) . '/github-checker.php');

//Register classes defined in this file with the factory.
PucFactory::addVersion('PluginUpdateChecker', 'PluginUpdateChecker_3_1', '3.1');
PucFactory::addVersion('PluginUpdate', 'PluginUpdate_3_1', '3.1');
PucFactory::addVersion('PluginInfo', 'PluginInfo_3_1', '3.1');
PucFactory::addVersion('PucGitHubChecker', 'PucGitHubChecker_3_1', '3.1');