<?php

/**

 * WordPress Plugin Administration API

 *

 * @package WordPress

 * @subpackage Administration

 */

/**

 * Parse the plugin contents to retrieve plugin's metadata.

 *

 * The metadata of the plugin's data searches for the following in the plugin's

 * header. All plugin data must be on its own line. For plugin description, it

 * must not have any newlines or only parts of the description will be displayed

 * and the same goes for the plugin data. The below is formatted for printing.

 *

 * <code>

 * /*

 * Plugin Name: Name of Plugin

 * Plugin URI: Link to plugin information

 * Description: Plugin Description

 * Author: Plugin author's name

 * Author URI: Link to the author's web site

 * Version: Must be set in the plugin for WordPress 2.3+

 * Text Domain: Optional. Unique identifier, should be same as the one used in

 *		plugin_text_domain()

 * Domain Path: Optional. Only useful if the translations are located in a

 *		folder above the plugin's base path. For example, if .mo files are

 *		located in the locale folder then Domain Path will be "/locale/" and

 *		must have the first slash. Defaults to the base folder the plugin is

 *		located in.

 *  * / # Remove the space to close comment

 * </code>

 *

 * Plugin data returned array contains the following:

 *		'Name' - Name of the plugin, must be unique.

 *		'Title' - Title of the plugin and the link to the plugin's web site.

 *		'Description' - Description of what the plugin does and/or notes

 *		from the author.

 *		'Author' - The author's name

 *		'AuthorURI' - The authors web site address.

 *		'Version' - The plugin version number.

 *		'PluginURI' - Plugin web site address.

 *		'TextDomain' - Plugin's text domain for localization.

 *		'DomainPath' - Plugin's relative directory path to .mo files.

 *

 * Some users have issues with opening large files and manipulating the contents

 * for want is usually the first 1kiB or 2kiB. This function stops pulling in

 * the plugin contents when it has all of the required plugin data.

 *

 * The first 8kiB of the file will be pulled in and if the plugin data is not

 * within that first 8kiB, then the plugin author should correct their plugin

 * and move the plugin data headers to the top.

 *

 * The plugin file is assumed to have permissions to allow for scripts to read

 * the file. This is not checked however and the file is only opened for

 * reading.

 *

 * @link http://trac.wordpress.org/ticket/5651 Previous Optimizations.

 * @link http://trac.wordpress.org/ticket/7372 Further and better Optimizations.

 * @since 1.5.0

 *

 * @param string $plugin_file Path to the plugin file

 * @param bool $markup If the returned data should have HTML markup applied

 * @param bool $translate If the returned data should be translated

 * @return array See above for description.

 */

function get_plugin_data( $plugin_file, $markup = true, $translate = true ) {

	$default_headers = array( 

		'Name' => 'Plugin Name', 

		'PluginURI' => 'Plugin URI', 

		'Version' => 'Version', 

		'Description' => 'Description', 

		'Author' => 'Author', 

		'AuthorURI' => 'Author URI', 

		'TextDomain' => 'Text Domain', 

		'DomainPath' => 'Domain Path' 

		);

	$plugin_data = get_file_data( $plugin_file, $default_headers, 'plugin' );

	//For backward compatibility by default Title is the same as Name.

	$plugin_data['Title'] = $plugin_data['Name'];

	if ( $markup || $translate )

		$plugin_data = _get_plugin_data_markup_translate( $plugin_file, $plugin_data, $markup, $translate );

	return $plugin_data;

}

function _get_plugin_data_markup_translate($plugin_file, $plugin_data, $markup = true, $translate = true) {

	//Translate fields

	if( $translate && ! empty($plugin_data['TextDomain']) ) {

		if( ! empty( $plugin_data['DomainPath'] ) )

			load_plugin_textdomain($plugin_data['TextDomain'], false, dirname($plugin_file). $plugin_data['DomainPath']);

		else

			load_plugin_textdomain($plugin_data['TextDomain'], false, dirname($plugin_file));

		foreach ( array('Name', 'PluginURI', 'Description', 'Author', 'AuthorURI', 'Version') as $field )

			$plugin_data[ $field ] = translate($plugin_data[ $field ], $plugin_data['TextDomain']);

	}

	//Apply Markup

	if ( $markup ) {

		if ( ! empty($plugin_data['PluginURI']) && ! empty($plugin_data['Name']) )

			$plugin_data['Title'] = '<a href="' . $plugin_data['PluginURI'] . '" title="' . __( 'Visit plugin homepage' ) . '">' . $plugin_data['Name'] . '</a>';

		else

			$plugin_data['Title'] = $plugin_data['Name'];

		if ( ! empty($plugin_data['AuthorURI']) && ! empty($plugin_data['Author']) )

			$plugin_data['Author'] = '<a href="' . $plugin_data['AuthorURI'] . '" title="' . __( 'Visit author homepage' ) . '">' . $plugin_data['Author'] . '</a>';

		$plugin_data['Description'] = wptexturize( $plugin_data['Description'] );

		if( ! empty($plugin_data['Author']) )

			$plugin_data['Description'] .= ' <cite>' . sprintf( __('By %s'), $plugin_data['Author'] ) . '.</cite>';

	}

	$plugins_allowedtags = array('a' => array('href' => array(),'title' => array()),'abbr' => array('title' => array()),'acronym' => array('title' => array()),'code' => array(),'em' => array(),'strong' => array());

	// Sanitize all displayed data

	$plugin_data['Title']       = wp_kses($plugin_data['Title'], $plugins_allowedtags);

	$plugin_data['Version']     = wp_kses($plugin_data['Version'], $plugins_allowedtags);

	$plugin_data['Description'] = wp_kses($plugin_data['Description'], $plugins_allowedtags);

	$plugin_data['Author']      = wp_kses($plugin_data['Author'], $plugins_allowedtags);

	return $plugin_data;

}

/**

 * Get a list of a plugin's files.

 *

 * @since 2.8.0

 *

 * @param string $plugin Plugin ID

 * @return array List of files relative to the plugin root.

 */

function get_plugin_files($plugin) {

	$plugin_file = WP_PLUGIN_DIR . '/' . $plugin;

	$dir = dirname($plugin_file);

	$plugin_files = array($plugin);

	if ( is_dir($dir) && $dir != WP_PLUGIN_DIR ) {

		$plugins_dir = @ opendir( $dir );

		if ( $plugins_dir ) {

			while (($file = readdir( $plugins_dir ) ) !== false ) {

				if ( substr($file, 0, 1) == '.' )

					continue;

				if ( is_dir( $dir . '/' . $file ) ) {

					$plugins_subdir = @ opendir( $dir . '/' . $file );

					if ( $plugins_subdir ) {

						while (($subfile = readdir( $plugins_subdir ) ) !== false ) {

							if ( substr($subfile, 0, 1) == '.' )

								continue;

							$plugin_files[] = plugin_basename("$dir/$file/$subfile");

						}

						@closedir( $plugins_subdir );

					}

				} else {

					if ( plugin_basename("$dir/$file") != $plugin )

						$plugin_files[] = plugin_basename("$dir/$file");

				}

			}

			@closedir( $plugins_dir );

		}

	}

	return $plugin_files;

}

/**

 * Check the plugins directory and retrieve all plugin files with plugin data.

 *

 * WordPress only supports plugin files in the base plugins directory

 * (wp-content/plugins) and in one directory above the plugins directory

 * (wp-content/plugins/my-plugin). The file it looks for has the plugin data and

 * must be found in those two locations. It is recommended that do keep your

 * plugin files in directories.

 *

 * The file with the plugin data is the file that will be included and therefore

 * needs to have the main execution for the plugin. This does not mean

 * everything must be contained in the file and it is recommended that the file

 * be split for maintainability. Keep everything in one file for extreme

 * optimization purposes.

 *

 * @since unknown

 *

 * @param string $plugin_folder Optional. Relative path to single plugin folder.

 * @return array Key is the plugin file path and the value is an array of the plugin data.

 */

function get_plugins($plugin_folder = '') {

	if ( ! $cache_plugins = wp_cache_get('plugins', 'plugins') )

		$cache_plugins = array();

	if ( isset($cache_plugins[ $plugin_folder ]) )

		return $cache_plugins[ $plugin_folder ];

	$wp_plugins = array ();

	$plugin_root = WP_PLUGIN_DIR;

	if( !empty($plugin_folder) )

		$plugin_root .= $plugin_folder;

	// Files in wp-content/plugins directory

	$plugins_dir = @ opendir( $plugin_root);

	$plugin_files = array();

	if ( $plugins_dir ) {

		while (($file = readdir( $plugins_dir ) ) !== false ) {

			if ( substr($file, 0, 1) == '.' )

				continue;

			if ( is_dir( $plugin_root.'/'.$file ) ) {

				$plugins_subdir = @ opendir( $plugin_root.'/'.$file );

				if ( $plugins_subdir ) {

					while (($subfile = readdir( $plugins_subdir ) ) !== false ) {

						if ( substr($subfile, 0, 1) == '.' )

							continue;

						if ( substr($subfile, -4) == '.php' )

							$plugin_files[] = "$file/$subfile";

					}

				}

			} else {

				if ( substr($file, -4) == '.php' )

					$plugin_files[] = $file;

			}

		}

	}

	@closedir( $plugins_dir );

	@closedir( $plugins_subdir );

	if ( !$plugins_dir || empty($plugin_files) )

		return $wp_plugins;

	foreach ( $plugin_files as $plugin_file ) {

		if ( !is_readable( "$plugin_root/$plugin_file" ) )

			continue;

		$plugin_data = get_plugin_data( "$plugin_root/$plugin_file", false, false ); //Do not apply markup/translate as it'll be cached.

		if ( empty ( $plugin_data['Name'] ) )

			continue;

		$wp_plugins[plugin_basename( $plugin_file )] = $plugin_data;

	}

	uasort( $wp_plugins, create_function( '$a, $b', 'return strnatcasecmp( $a["Name"], $b["Name"] );' ));

	$cache_plugins[ $plugin_folder ] = $wp_plugins;

	wp_cache_set('plugins', $cache_plugins, 'plugins');

	return $wp_plugins;

}

/**

 * Check whether the plugin is active by checking the active_plugins list.

 *

 * @since 2.5.0

 *

 * @param string $plugin Base plugin path from plugins directory.

 * @return bool True, if in the active plugins list. False, not in the list.

 */

function is_plugin_active($plugin) {

	return in_array( $plugin, apply_filters( 'active_plugins', get_option( 'active_plugins' ) ) );

}

/**

 * Attempts activation of plugin in a "sandbox" and redirects on success.

 *

 * A plugin that is already activated will not attempt to be activated again.

 *

 * The way it works is by setting the redirection to the error before trying to

 * include the plugin file. If the plugin fails, then the redirection will not

 * be overwritten with the success message. Also, the options will not be

 * updated and the activation hook will not be called on plugin error.

 *

 * It should be noted that in no way the below code will actually prevent errors

 * within the file. The code should not be used elsewhere to replicate the

 * "sandbox", which uses redirection to work.

 * {@source 13 1}

 *

 * If any errors are found or text is outputted, then it will be captured to

 * ensure that the success redirection will update the error redirection.

 *

 * @since unknown

 *

 * @param string $plugin Plugin path to main plugin file with plugin data.

 * @param string $redirect Optional. URL to redirect to.

 * @return WP_Error|null WP_Error on invalid file or null on success.

 */

function activate_plugin($plugin, $redirect = '') {

	$current = get_option('active_plugins');

	$plugin = plugin_basename(trim($plugin));

	$valid = validate_plugin($plugin);

	if ( is_wp_error($valid) )

		return $valid;

	if ( !in_array($plugin, $current) ) {

		if ( !empty($redirect) )

			wp_redirect(add_query_arg('_error_nonce', wp_create_nonce('plugin-activation-error_' . $plugin), $redirect)); // we'll override this later if the plugin can be included without fatal error

		ob_start();

		@include(WP_PLUGIN_DIR . '/' . $plugin);

		$current[] = $plugin;

		sort($current);

		do_action( 'activate_plugin', trim( $plugin) );

		update_option('active_plugins', $current);

		do_action( 'activate_' . trim( $plugin ) );

		do_action( 'activated_plugin', trim( $plugin) );

		ob_end_clean();

	}

	return null;

}

/**

 * Deactivate a single plugin or multiple plugins.

 *

 * The deactivation hook is disabled by the plugin upgrader by using the $silent

 * parameter.

 *

 * @since unknown

 *

 * @param string|array $plugins Single plugin or list of plugins to deactivate.

 * @param bool $silent Optional, default is false. Prevent calling deactivate hook.

 */

function deactivate_plugins($plugins, $silent= false) {

	$current = get_option('active_plugins');

	if ( !is_array($plugins) )

		$plugins = array($plugins);

	foreach ( $plugins as $plugin ) {

		$plugin = plugin_basename($plugin);

		if( ! is_plugin_active($plugin) )

			continue;

		if ( ! $silent )

			do_action( 'deactivate_plugin', trim( $plugin ) );

		$key = array_search( $plugin, (array) $current );

		if ( false !== $key )

			array_splice( $current, $key, 1 );

		//Used by Plugin updater to internally deactivate plugin, however, not to notify plugins of the fact to prevent plugin output.

		if ( ! $silent ) {

			do_action( 'deactivate_' . trim( $plugin ) );

			do_action( 'deactivated_plugin', trim( $plugin ) );

		}

	}

	update_option('active_plugins', $current);

}

/**

 * Activate multiple plugins.

 *

 * When WP_Error is returned, it does not mean that one of the plugins had

 * errors. It means that one or more of the plugins file path was invalid.

 *

 * The execution will be halted as soon as one of the plugins has an error.

 *

 * @since unknown

 *

 * @param string|array $plugins

 * @param string $redirect Redirect to page after successful activation.

 * @return bool|WP_Error True when finished or WP_Error if there were errors during a plugin activation.

 */

function activate_plugins($plugins, $redirect = '') {

	if ( !is_array($plugins) )

		$plugins = array($plugins);

	$errors = array();

	foreach ( (array) $plugins as $plugin ) {

		if ( !empty($redirect) )

			$redirect = add_query_arg('plugin', $plugin, $redirect);

		$result = activate_plugin($plugin, $redirect);

		if ( is_wp_error($result) )

			$errors[$plugin] = $result;

	}

	if ( !empty($errors) )

		return new WP_Error('plugins_invalid', __('One of the plugins is invalid.'), $errors);

	return true;

}

/**

 * Remove directory and files of a plugin for a single or list of plugin(s).

 *

 * If the plugins parameter list is empty, false will be returned. True when

 * completed.

 *

 * @since unknown

 *

 * @param array $plugins List of plugin

 * @param string $redirect Redirect to page when complete.

 * @return mixed

 */

function delete_plugins($plugins, $redirect = '' ) {

	global $wp_filesystem;