<?php

/**

 * WordPress Plugin Administration API

 *

 * @package WordPress

 * @subpackage Administration

 */

/**

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

 *

 * All plugin headers must be on their own line. Plugin description must not have

 * any newlines, otherwise only parts of the description will be displayed.

 * The below is formatted for printing.

 *

 *     /*

 *     Plugin Name: Name of the plugin.

 *     Plugin URI: The home page of the plugin.

 *     Description: Plugin description.

 *     Author: Plugin author's name.

 *     Author URI: Link to the author's website.

 *     Version: Plugin version.

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

 *          load_plugin_textdomain().

 *     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.

 *     Network: Optional. Specify "Network: true" to require that a plugin is activated

 *          across all sites in an installation. This will prevent a plugin from being

 *          activated on a single site when Multisite is enabled.

 *     Requires at least: Optional. Specify the minimum required WordPress version.

 *     Requires PHP: Optional. Specify the minimum required PHP version.

 *     * / # Remove the space to close comment.

 *

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

 * within that first 8 KB, 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.

 *

 * @since 1.5.0

 * @since 5.3.0 Added support for `Requires at least` and `Requires PHP` headers.

 * @since 5.8.0 Added support for `Update URI` header.

 *

 * @param string $plugin_file Absolute path to the main plugin file.

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

 *                            Default true.

 * @param bool   $translate   Optional. If the returned data should be translated. Default true.

 * @return array {

 *     Plugin data. Values will be empty if not supplied by the plugin.

 *

 *     @type string $Name        Name of the plugin. Should be unique.

 *     @type string $Description Plugin description.

 *     @type string $TextDomain  Plugin textdomain.

 *     @type bool   $Network     Whether the plugin can only be activated network-wide.

 *     @type string $RequiresWP  Minimum required version of WordPress.

 *     @type string $RequiresPHP Minimum required version of PHP.

 *     @type string $UpdateURI   ID of the plugin for update purposes, should be a URI.

 * }

 */

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',

		'Network'     => 'Network',

		'RequiresWP'  => 'Requires at least',

		'RequiresPHP' => 'Requires PHP',

		'UpdateURI'   => 'Update URI',

		// Site Wide Only is deprecated in favor of Network.

		'_sitewide'   => 'Site Wide Only',

	);

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

	// Site Wide Only is the old header for Network.

	if ( ! $plugin_data['Network'] && $plugin_data['_sitewide'] ) {

		/* translators: 1: Site Wide Only: true, 2: Network: true */

		_deprecated_argument( __FUNCTION__, '3.0.0', sprintf( __( 'The %1$s plugin header is deprecated. Use %2$s instead.' ), '<code>Site Wide Only: true</code>', '<code>Network: true</code>' ) );

		$plugin_data['Network'] = $plugin_data['_sitewide'];

	}

	$plugin_data['Network'] = ( 'true' === strtolower( $plugin_data['Network'] ) );

	unset( $plugin_data['_sitewide'] );

	// If no text domain is defined fall back to the plugin slug.

	if ( ! $plugin_data['TextDomain'] ) {

		$plugin_slug = dirname( plugin_basename( $plugin_file ) );

		if ( '.' !== $plugin_slug && false === strpos( $plugin_slug, '/' ) ) {

			$plugin_data['TextDomain'] = $plugin_slug;

		}

	}

	if ( $markup || $translate ) {

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

	} else {

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

		$plugin_data['AuthorName'] = $plugin_data['Author'];

	}

	return $plugin_data;

}

/**

 * Sanitizes plugin data, optionally adds markup, optionally translates.

 *

 * @since 2.7.0

 *

 * @see get_plugin_data()

 *

 * @access private

 *

 * @param string $plugin_file Path to the main plugin file.

 * @param array  $plugin_data An array of plugin data. See `get_plugin_data()`.

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

 *                            Default true.

 * @param bool   $translate   Optional. If the returned data should be translated. Default true.

 */

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

	// Sanitize the plugin filename to a WP_PLUGIN_DIR relative path.

	$plugin_file = plugin_basename( $plugin_file );

	// Translate fields.

	if ( $translate ) {

		$textdomain = $plugin_data['TextDomain'];

		if ( $textdomain ) {

			if ( ! is_textdomain_loaded( $textdomain ) ) {

				if ( $plugin_data['DomainPath'] ) {

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

				} else {

					load_plugin_textdomain( $textdomain, false, dirname( $plugin_file ) );

				}

			}

		} elseif ( 'hello.php' === basename( $plugin_file ) ) {

			$textdomain = 'default';

		}

		if ( $textdomain ) {

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

			}

		}

	}

	// Sanitize fields.

	$allowed_tags_in_links = array(

		'abbr'    => array( 'title' => true ),

		'acronym' => array( 'title' => true ),

		'code'    => true,

		'em'      => true,

		'strong'  => true,

	);

	$allowed_tags      = $allowed_tags_in_links;

	$allowed_tags['a'] = array(

		'href'  => true,

		'title' => true,

	);

	// Name is marked up inside <a> tags. Don't allow these.

	// Author is too, but some plugins have used <a> here (omitting Author URI).

	$plugin_data['Name']   = wp_kses( $plugin_data['Name'], $allowed_tags_in_links );

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

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

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

	$plugin_data['PluginURI'] = esc_url( $plugin_data['PluginURI'] );

	$plugin_data['AuthorURI'] = esc_url( $plugin_data['AuthorURI'] );

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

	$plugin_data['AuthorName'] = $plugin_data['Author'];

	// Apply markup.

	if ( $markup ) {

		if ( $plugin_data['PluginURI'] && $plugin_data['Name'] ) {

			$plugin_data['Title'] = '<a href="' . $plugin_data['PluginURI'] . '">' . $plugin_data['Name'] . '</a>';

		}

		if ( $plugin_data['AuthorURI'] && $plugin_data['Author'] ) {

			$plugin_data['Author'] = '<a href="' . $plugin_data['AuthorURI'] . '">' . $plugin_data['Author'] . '</a>';

		}

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

		if ( $plugin_data['Author'] ) {

			$plugin_data['Description'] .= sprintf(

				/* translators: %s: Plugin author. */

				' <cite>' . __( 'By %s.' ) . '</cite>',

				$plugin_data['Author']

			);

		}

	}

	return $plugin_data;

}

/**

 *

 * @since 2.8.0

 *

 * @param string $plugin Path to the plugin file relative to the plugins directory.

 * @return string[] Array of file names relative to the plugin root.

 */

function get_plugin_files( $plugin ) {

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

	$dir         = dirname( $plugin_file );

	$plugin_files = array( plugin_basename( $plugin_file ) );

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

		/**

		 * Filters the array of excluded directories and files while scanning the folder.

		 *

		 * @since 4.9.0

		 *

		 * @param string[] $exclusions Array of excluded directories and files.

		 */

		$exclusions = (array) apply_filters( 'plugin_files_exclusions', array( 'CVS', 'node_modules', 'vendor', 'bower_components' ) );

		$list_files = list_files( $dir, 100, $exclusions );

		$list_files = array_map( 'plugin_basename', $list_files );

		$plugin_files = array_merge( $plugin_files, $list_files );

		$plugin_files = array_values( array_unique( $plugin_files ) );

	}

	return $plugin_files;

}

/**

 *

 * 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 to keep your

 * plugin files in their own 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 1.5.0

 *

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

 * @return array[] Array of arrays of plugin data, keyed by plugin file name. See `get_plugin_data()`.

 */

function get_plugins( $plugin_folder = '' ) {

	$cache_plugins = wp_cache_get( 'plugins', 'plugins' );

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

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

						}

					}

					closedir( $plugins_subdir );

				}

			} else {

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

					$plugin_files[] = $file;

				}

			}

		}

		closedir( $plugins_dir );

	}

	if ( empty( $plugin_files ) ) {

		return $wp_plugins;

	}

	foreach ( $plugin_files as $plugin_file ) {

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

			continue;

		}

		// Do not apply markup/translate as it will be cached.

		$plugin_data = get_plugin_data( "$plugin_root/$plugin_file", false, false );

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

			continue;

		}

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

	}

	uasort( $wp_plugins, '_sort_uname_callback' );

	$cache_plugins[ $plugin_folder ] = $wp_plugins;

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

	return $wp_plugins;

}

/**

 *

 * WordPress only includes mu-plugin files in the base mu-plugins directory (wp-content/mu-plugins).

 *

 * @since 3.0.0

 * @return array[] Array of arrays of mu-plugin data, keyed by plugin file name. See `get_plugin_data()`.

 */

function get_mu_plugins() {

	$wp_plugins   = array();

	$plugin_files = array();

	if ( ! is_dir( WPMU_PLUGIN_DIR ) ) {

		return $wp_plugins;

	}

	// Files in wp-content/mu-plugins directory.

	$plugins_dir = @opendir( WPMU_PLUGIN_DIR );

	if ( $plugins_dir ) {

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

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

				$plugin_files[] = $file;

			}

		}

	} else {

		return $wp_plugins;

	}

	closedir( $plugins_dir );

	if ( empty( $plugin_files ) ) {

		return $wp_plugins;

	}

	foreach ( $plugin_files as $plugin_file ) {

		if ( ! is_readable( WPMU_PLUGIN_DIR . "/$plugin_file" ) ) {

			continue;

		}

		// Do not apply markup/translate as it will be cached.

		$plugin_data = get_plugin_data( WPMU_PLUGIN_DIR . "/$plugin_file", false, false );

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

			$plugin_data['Name'] = $plugin_file;

		}

		$wp_plugins[ $plugin_file ] = $plugin_data;

	}

	if ( isset( $wp_plugins['index.php'] ) && filesize( WPMU_PLUGIN_DIR . '/index.php' ) <= 30 ) {

		// Silence is golden.

		unset( $wp_plugins['index.php'] );