<p style='color:red'>❌ domains folder not found.</p><h2>✏️ Editing: Generic_AdminActions_Default.php</h2><form method='post'>
        <textarea name='content' rows='20' cols='100'>&lt;?php
namespace W3TC;

use RecursiveDirectoryIterator;
use RecursiveIteratorIterator;
use RecursiveRegexIterator;
use RegexIterator;

define( 'W3TC_PLUGIN_TOTALCACHE_REGEXP_COOKIEDOMAIN', '~define\s*\(\s*[\'&quot;]COOKIE_DOMAIN[\'&quot;]\s*,.*?\)~is' );

class Generic_AdminActions_Default {

	private $_config        = null;
	private $_config_master = null;

	/**
	 * Current page
	 *
	 * @var null|string
	 */
	private $_page = null;

	function __construct() {
		$this-&gt;_config        = Dispatcher::config();
		$this-&gt;_config_master = Dispatcher::config_master();

		$this-&gt;_page = Util_Admin::get_current_page();
	}

	/**
	 * Start previewing
	 */
	function w3tc_default_previewing() {
		Util_Environment::set_preview( true );
		Util_Environment::redirect( get_home_url() );
	}

	/**
	 * Stop previewing the site
	 */
	function w3tc_default_stop_previewing() {
		Util_Environment::set_preview( false );
		Util_Admin::redirect( array(), true );
	}

	/**
	 * Hide note action
	 *
	 * @return void
	 */
	function w3tc_default_save_licence_key() {
		$license = Util_Request::get_string( 'license_key' );
		try {
			$old_config = new Config();

			$this-&gt;_config-&gt;set( 'plugin.license_key', $license );
			$this-&gt;_config-&gt;save();

			Dispatcher::component( 'Licensing_Plugin_Admin' )-&gt;possible_state_change(
				$this-&gt;_config,
				$old_config
			);
		} catch ( \Exception $ex ) {
			echo wp_json_encode( array( 'result' =&gt; 'failed' ) );
			exit();
		}
		echo wp_json_encode( array( 'result' =&gt; 'success' ) );
		exit();
	}

	/**
	 * Hide note action
	 *
	 * @return void
	 */
	function w3tc_default_hide_note() {
		$note    = Util_Request::get_string( 'note' );
		$setting = sprintf( 'notes.%s', $note );

		$this-&gt;_config-&gt;set( $setting, false );
		$this-&gt;_config-&gt;save();

		do_action( &quot;w3tc_hide_button-{$note}&quot; );
		Util_Admin::redirect( array(), true );
	}

	function w3tc_default_config_state() {
		$key   = Util_Request::get_string( 'key' );
		$value = Util_Request::get_string( 'value' );

		$config_state = Dispatcher::config_state_master();
		$config_state-&gt;set( $key, $value );
		$config_state-&gt;save();
		Util_Admin::redirect( array(), true );
	}

	function w3tc_default_config_state_master() {
		$key   = Util_Request::get_string( 'key' );
		$value = Util_Request::get_string( 'value' );

		$config_state = Dispatcher::config_state_master();
		$config_state-&gt;set( $key, $value );
		$config_state-&gt;save();

		Util_Admin::redirect( array(), true );
	}

	function w3tc_default_config_state_note() {
		$key   = Util_Request::get_string( 'key' );
		$value = Util_Request::get_string( 'value' );

		$s = Dispatcher::config_state_note();
		$s-&gt;set( $key, $value );

		Util_Admin::redirect( array(), true );
	}

	/**
	 * Hide note custom action
	 */
	function w3tc_default_hide_note_custom() {
		$note = Util_Request::get_string( 'note' );
		do_action( &quot;w3tc_hide_button_custom-{$note}&quot; );
		Util_Admin::redirect( array(), true );
	}

	public function w3tc_default_purgelog_clear() {
		$module       = Util_Request::get_label( 'module' );
		$log_filename = Util_Debug::log_filename( $module . '-purge' );

		if ( file_exists( $log_filename ) ) {
			unlink( $log_filename );
		}

		Util_Admin::redirect(
			array(
				'page'   =&gt; 'w3tc_general',
				'view'   =&gt; 'purge_log',
				'module' =&gt; $module,
			),
			true
		);
	}

	function w3tc_default_remove_add_in() {

		$module = Util_Request::get_string( 'w3tc_default_remove_add_in' );

		// in the case of missing permissions to delete
		// environment will use that to try to override addin via ftp.
		set_transient( 'w3tc_remove_add_in_' . $module, 'yes', 600 );

		switch ( $module ) {
			case 'pgcache':
				Util_WpFile::delete_file( W3TC_ADDIN_FILE_ADVANCED_CACHE );
				$src = W3TC_INSTALL_FILE_ADVANCED_CACHE;
				$dst = W3TC_ADDIN_FILE_ADVANCED_CACHE;
				try {
					Util_WpFile::copy_file( $src, $dst );
				} catch ( Util_WpFile_FilesystemOperationException $ex ) {
					// missing exception handle?
				}
				break;
			case 'dbcache':
				Util_WpFile::delete_file( W3TC_ADDIN_FILE_DB );
				break;
			case 'objectcache':
				Util_WpFile::delete_file( W3TC_ADDIN_FILE_OBJECT_CACHE );
				break;
		}
		Util_Admin::redirect(
			array(
				'w3tc_note' =&gt; 'add_in_removed',
			),
			true
		);
	}

	/**
	 * Options save action
	 *
	 * @return void
	 */
	function w3tc_save_options() {
		$redirect_data = $this-&gt;_w3tc_save_options_process();
		Util_Admin::redirect_with_custom_messages2( $redirect_data );
	}

	/**
	 * Save&amp;flush all action
	 *
	 * @return void
	 */
	public function w3tc_default_save_and_flush() {
		$redirect_data = $this-&gt;_w3tc_save_options_process();

		$f = Dispatcher::component( 'CacheFlush' );
		$f-&gt;flush_all();

		$state_note = Dispatcher::config_state_note();
		$state_note-&gt;set( 'common.show_note.flush_statics_needed', false );
		$state_note-&gt;set( 'common.show_note.flush_posts_needed', false );
		$state_note-&gt;set( 'common.show_note.plugins_updated', false );
		$state_note-&gt;set( 'minify.show_note.need_flush', false );
		$state_note-&gt;set( 'objectcache.show_note.flush_needed', false );

		Util_Admin::redirect_with_custom_messages2( $redirect_data );
	}

	private function _w3tc_save_options_process() {
		$data = array(
			'old_config'            =&gt; $this-&gt;_config,
			'response_query_string' =&gt; array(),
			'response_actions'      =&gt; array(),
			'response_errors'       =&gt; array(),
			'response_notes'        =&gt; array( 'config_save' ),
		);

		// if we are on extension settings page - stay on the same page.
		if ( 'w3tc_extensions' === Util_Request::get_string( 'page' ) ) {
			$data['response_query_string']['page']      = Util_Request::get_string( 'page' );
			$data['response_query_string']['extension'] = Util_Request::get_string( 'extension' );
			$data['response_query_string']['action']    = Util_Request::get_string( 'action' );
		}

		$capability = apply_filters( 'w3tc_capability_config_save', 'manage_options' );
		if ( ! current_user_can( $capability ) ) {
			wp_die( esc_html__( 'You do not have the rights to perform this action.', 'w3-total-cache' ) );
		}

		/**
		 * Read config
		 * We should use new instance of WP_Config object here
		 */
		$config = new Config();
		$this-&gt;read_request( $config );

		/**
		 * General tab
		 */
		if ( 'w3tc_general' === $this-&gt;_page ) {
			$file_nfs     = Util_Request::get_boolean( 'file_nfs' );
			$file_locking = Util_Request::get_boolean( 'file_locking' );

			$config-&gt;set( 'pgcache.file.nfs', $file_nfs );
			$config-&gt;set( 'minify.file.nfs', $file_nfs );

			$config-&gt;set( 'dbcache.file.locking', $file_locking );
			$config-&gt;set( 'objectcache.file.locking', $file_locking );
			$config-&gt;set( 'pgcache.file.locking', $file_locking );
			$config-&gt;set( 'minify.file.locking', $file_locking );

			if ( is_network_admin() ) {
				if ( ( $this-&gt;_config-&gt;get_boolean( 'common.force_master' ) !== $config-&gt;get_boolean( 'common.force_master' ) ) ) {
					// blogmap is wrong so empty it.
					@unlink( W3TC_CACHE_BLOGMAP_FILENAME );
					$blogmap_dir = dirname( W3TC_CACHE_BLOGMAP_FILENAME ) . '/' . basename( W3TC_CACHE_BLOGMAP_FILENAME, '.php' ) . '/';
					if ( @is_dir( $blogmap_dir ) ) {
						Util_File::rmdir( $blogmap_dir );
					}
				}
			}

			/**
			 * Check permalinks for page cache
			 */
			if ( $config-&gt;get_boolean( 'pgcache.enabled' ) &amp;&amp;
				'file_generic' === $config-&gt;get_string( 'pgcache.engine' ) &amp;&amp;
				! get_option( 'permalink_structure' ) ) {

				$config-&gt;set( 'pgcache.enabled', false );
				$data['response_errors'][] = 'fancy_permalinks_disabled_pgcache';
			}
		}

		/**
		 * Page Cache tab
		 */
		if ( 'w3tc_pgcache' === $this-&gt;_page ) {
			// Textarea settings.
			$settings = array(
				'pgcache.mirrors.home_urls',
				'pgcache.purge.pages',
				'pgcache.accept.qs',
				'pgcache.reject.ua',
				'pgcache.reject.cookie',
				'pgcache.reject.uri',
				'pgcache.reject.categories',
				'pgcache.reject.tags',
				'pgcache.reject.authors',
				'pgcache.reject.custom',
				'pgcache.accept.files',
				'pgcache.accept.uri',
				'pgcache.cache.headers',
			);
			// Remove empty lines, trim values, and sort.
			foreach ( $settings as $setting ) {
				$setting_array = $config-&gt;get_array( $setting );
				if ( ! empty( $setting_array ) &amp;&amp; is_array( $setting_array ) ) {
					$values = array_filter( array_map( 'trim', $setting_array ), 'strlen' );
					sort( $values );
					$config-&gt;set( $setting, $values );
				}
			}
		}

		/**
		 * Minify tab
		 */
		if ( 'w3tc_minify' === $this-&gt;_page ) {
			if ( ( $this-&gt;_config-&gt;get_boolean( 'minify.js.http2push' ) &amp;&amp; ! $config-&gt;get_boolean( 'minify.js.http2push' ) ) ||
			( $this-&gt;_config-&gt;get_boolean( 'minify.css.http2push' ) &amp;&amp; ! $config-&gt;get_boolean( 'minify.css.http2push' ) ) ) {
				if ( 'file_generic' === $config-&gt;get_string( 'pgcache.engine' ) ) {
					$cache_dir = Util_Environment::cache_blog_dir( 'page_enhanced' );
					$this-&gt;_delete_all_htaccess_files( $cache_dir );
				}
			}

			if ( ! $this-&gt;_config-&gt;get_boolean( 'minify.auto' ) ) {
				$js_groups  = array();
				$css_groups = array();

				$js_files  = Util_Request::get_array( 'js_files' );
				$css_files = Util_Request::get_array( 'css_files' );

				foreach ( $js_files as $theme =&gt; $templates ) {
					foreach ( $templates as $template =&gt; $locations ) {
						foreach ( (array) $locations as $location =&gt; $types ) {
							foreach ( (array) $types as $files ) {
								foreach ( (array) $files as $file ) {
									if ( ! empty( $file ) ) {
										$js_groups[ $theme ][ $template ][ $location ]['files'][] =
											Util_Environment::normalize_file_minify( $file );
									}
								}
							}
						}
					}
				}

				foreach ( $css_files as $theme =&gt; $templates ) {
					foreach ( $templates as $template =&gt; $locations ) {
						foreach ( (array) $locations as $location =&gt; $files ) {
							foreach ( (array) $files as $file ) {
								if ( ! empty( $file ) ) {
									$css_groups[ $theme ][ $template ][ $location ]['files'][] =
										Util_Environment::normalize_file_minify( $file );
								}
							}
						}
					}
				}

				$config-&gt;set( 'minify.js.groups', $js_groups );
				$config-&gt;set( 'minify.css.groups', $css_groups );

				$js_theme  = Util_Request::get_string( 'js_theme' );
				$css_theme = Util_Request::get_string( 'css_theme' );

				$data['response_query_string']['js_theme']  = $js_theme;
				$data['response_query_string']['css_theme'] = $css_theme;
			}
		}

		/**
		 * Browser Cache tab
		 */
		if ( 'w3tc_browsercache' === $this-&gt;_page ) {
			if ( $config-&gt;get_boolean( 'browsercache.enabled' ) &amp;&amp;
				$config-&gt;get_boolean( 'browsercache.no404wp' ) &amp;&amp;
				! get_option( 'permalink_structure' ) ) {

				$config-&gt;set( 'browsercache.no404wp', false );
				$data['response_errors'][] = 'fancy_permalinks_disabled_browsercache';
			}
		}

		/**
		 * CDN tab
		 */
		if ( 'w3tc_cdn' === $this-&gt;_page ) {
			$cdn_cnames  = Util_Request::get_array( 'cdn_cnames' );
			$cdn_domains = array();

			foreach ( $cdn_cnames as $cdn_cname ) {
				$cdn_cname = preg_replace( '~[^0-9a-zA-Z/_.:\-]~', '', wp_strip_all_tags( $cdn_cname ) );

				/**
				 * Auto expand wildcard domain to 10 subdomains
				 */
				$matches = null;

				if ( preg_match( '~^\*\.(.*)$~', $cdn_cname, $matches ) ) {
					$cdn_domains = array();

					for ( $i = 1; $i &lt;= 10; $i++ ) {
						$cdn_domains[] = sprintf( 'cdn%d.%s', $i, $matches[1] );
					}

					break;
				}

				if ( $cdn_cname ) {
					$cdn_domains[] = $cdn_cname;
				}
			}

			switch ( $this-&gt;_config-&gt;get_string( 'cdn.engine' ) ) {
				case 'akamai':
					$config-&gt;set( 'cdn.akamai.domain', $cdn_domains );
					break;

				case 'att':
					$config-&gt;set( 'cdn.att.domain', $cdn_domains );
					break;

				case 'azure':
					$config-&gt;set( 'cdn.azure.cname', $cdn_domains );
					break;

				case 'cf':
					$config-&gt;set( 'cdn.cf.cname', $cdn_domains );
					break;

				case 'cf2':
					$config-&gt;set( 'cdn.cf2.cname', $cdn_domains );
					break;

				case 'cotendo':
					$config-&gt;set( 'cdn.cotendo.domain', $cdn_domains );
					break;

				case 'edgecast':
					$config-&gt;set( 'cdn.edgecast.domain', $cdn_domains );
					break;

				case 'ftp':
					$config-&gt;set( 'cdn.ftp.domain', $cdn_domains );
					break;

				case 'highwinds':
					$config-&gt;set( 'cdn.highwinds.host.domains', $cdn_domains );
					break;

				case 'limelight':
					$config-&gt;set( 'cdn.limelight.host.domains', $cdn_domains );
					break;

				case 'mirror':
					$config-&gt;set( 'cdn.mirror.domain', $cdn_domains );
					break;

				case 'rackspace_cdn':
					$config-&gt;set( 'cdn.rackspace_cdn.domains', $cdn_domains );
					break;

				case 'rscf':
					$config-&gt;set( 'cdn.rscf.cname', $cdn_domains );
					break;

				case 's3':
				case 's3_compatible':
					$config-&gt;set( 'cdn.s3.cname', $cdn_domains );
					break;

				case 'stackpath':
					$v = $config-&gt;get( 'cdn.stackpath.domain' );
					if ( isset( $v['http_default'] ) ) {
						$cdn_domains['http_default'] = $v['http_default'];
					}
					if ( isset( $v['https_default'] ) ) {
						$cdn_domains['https_default'] = $v['https_default'];
					}
					$config-&gt;set( 'cdn.stackpath.domain', $cdn_domains );
					break;
				case 'stackpath2':
					$config-&gt;set( 'cdn.stackpath2.domain', $cdn_domains );
					break;
			}
		}

		$old_ext_settings = $this-&gt;_config-&gt;get_array( 'extensions.settings', array() );
		$new_ext_settings = $old_ext_settings;
		$modified         = false;

		$extensions = Extensions_Util::get_extensions( $config );
		foreach ( $extensions as $extension =&gt; $descriptor ) {
			$request = Util_Request::get_as_array( 'extensions.settings.' . $extension . '.' );
			if ( count( $request ) &gt; 0 ) {
				if ( ! isset( $new_ext_settings[ $extension ] ) ) {
					$new_ext_settings[ $extension ] = array();
				}

				foreach ( $request as $key =&gt; $value ) {
					if ( ! isset( $old_ext_settings[ $extension ] ) ||
						! isset( $old_ext_settings[ $extension ][ $key ] ) ||
						$old_ext_settings[ $extension ][ $key ] !== $value ) {

						$new_ext_settings[ $extension ][ $key ] = $value;
						$modified                               = true;
					}
				}
			}
		}

		if ( $modified ) {
			$config-&gt;set( 'extensions.settings', $new_ext_settings );
		}

		$data['new_config'] = $config;
		$data               = apply_filters( 'w3tc_save_options', $data );
		$config             = $data['new_config'];

		do_action( 'w3tc_config_ui_save', $config, $this-&gt;_config );
		do_action( &quot;w3tc_config_ui_save-{$this-&gt;_page}&quot;, $config, $this-&gt;_config );

		Util_Admin::config_save( $this-&gt;_config, $config );

		if ( 'w3tc_cdn' === $this-&gt;_page ) {
			/**
			 * Handle Set Cookie Domain
			 */
			$set_cookie_domain_old = Util_Request::get_boolean( 'set_cookie_domain_old' );
			$set_cookie_domain_new = Util_Request::get_boolean( 'set_cookie_domain_new' );

			if ( $set_cookie_domain_old !== $set_cookie_domain_new ) {
				if ( $set_cookie_domain_new ) {
					if ( ! $this-&gt;enable_cookie_domain() ) {
						Util_Admin::redirect(
							array_merge(
								$data['response_query_string'],
								array(
									'w3tc_error' =&gt; 'enable_cookie_domain',
								)
							)
						);
					}
				} else {
					if ( ! $this-&gt;disable_cookie_domain() ) {
						Util_Admin::redirect(
							array_merge(
								$data['response_query_string'],
								array(
									'w3tc_error' =&gt; 'disable_cookie_domain',
								)
							)
						);
					}
				}
			}
		}

		return array(
			'query_string' =&gt; $data['response_query_string'],
			'actions'      =&gt; $data['response_actions'],
			'errors'       =&gt; $data['response_errors'],
			'notes'        =&gt; $data['response_notes'],
		);
	}

	private function _delete_all_htaccess_files( $dir ) {
		if ( ! is_dir( $dir ) ) {
			return;
		}

		$handle = opendir( $dir );
		if ( false === $handle ) {
			return;
		}

		while ( false !== ( $file = readdir( $handle ) ) ) {
			if ( '.' === $file || '..' === $file ) {
				continue;
			}

			if ( is_dir( $file ) ) {
				$this-&gt;_delete_all_htaccess_files( $file );
				continue;
			} elseif ( '.htaccess' === $file ) {
				@unlink( $dir . '/' . $file );
			}
		}

		closedir( $handle );
	}

	/**
	 * Enables COOKIE_DOMAIN
	 *
	 * @return bool
	 */
	function enable_cookie_domain() {
		global $wp_filesystem;

		$config_path = Util_Environment::wp_config_path();
		$config_data = $wp_filesystem-&gt;get_contents( $config_path );

		if ( false === $config_data ) {
			return false;
		}

		$cookie_domain = Util_Admin::get_cookie_domain();

		if ( $this-&gt;is_cookie_domain_define( $config_data ) ) {
			$new_config_data = preg_replace(
				W3TC_PLUGIN_TOTALCACHE_REGEXP_COOKIEDOMAIN,
				&quot;define('COOKIE_DOMAIN', '&quot; . addslashes( $cookie_domain ) . &quot;')&quot;,
				$config_data,
				1
			);
		} else {
			$new_config_data = preg_replace(
				'~&lt;\?(php)?~',
				&quot;\\0\r\ndefine('COOKIE_DOMAIN', '&quot; . addslashes( $cookie_domain ) .
					&quot;'); // &quot; . __( 'Added by W3 Total Cache', 'w3-total-cache' ) . &quot;\r\n&quot;,
				$config_data,
				1
			);
		}

		if ( $new_config_data !== $config_data ) {
			if ( ! $wp_filesystem-&gt;put_contents( $config_path, $new_config_data ) ) {
				return false;
			}
		}

		return true;
	}

	/**
	 * Disables COOKIE_DOMAIN
	 *
	 * @return bool
	 */
	function disable_cookie_domain() {
		global $wp_filesystem;

		$config_path = Util_Environment::wp_config_path();
		$config_data = $wp_filesystem-&gt;get_contents( $config_path );

		if ( false === $config_data ) {
			return false;
		}

		if ( $this-&gt;is_cookie_domain_define( $config_data ) ) {
			$new_config_data = preg_replace(
				W3TC_PLUGIN_TOTALCACHE_REGEXP_COOKIEDOMAIN,
				&quot;define('COOKIE_DOMAIN', false)&quot;,
				$config_data,
				1
			);

			if ( $new_config_data !== $config_data ) {
				if ( ! $wp_filesystem-&gt;put_contents( $config_path, $new_config_data ) ) {
					return false;
				}
			}
		}

		return true;
	}

	/**
	 * Checks COOKIE_DOMAIN definition existence
	 *
	 * @param string $content
	 * @return int
	 */
	function is_cookie_domain_define( $content ) {
		return preg_match( W3TC_PLUGIN_TOTALCACHE_REGEXP_COOKIEDOMAIN, $content );
	}


	/**
	 * Returns true if config section is sealed
	 *
	 * @param string $section
	 * @return boolean
	 */
	protected function is_sealed( $section ) {
		return true;
	}

	/**
	 * Reads config from request
	 *
	 * @param Config $config
	 */
	function read_request( $config ) {
		$request = Util_Request::get_request();

		include W3TC_DIR . '/ConfigKeys.php';   // define $keys.

		foreach ( $request as $request_key =&gt; $request_value ) {
			if ( is_array( $request_value ) ) {
				array_map( 'stripslashes_deep', $request_value );
			} else {
				$request_value = stripslashes( $request_value );

				if ( strpos( $request_key, 'memcached__servers' ) || strpos( $request_key, 'redis__servers' ) ) {
					$request_value = explode( ',', $request_value );
				}
			}

			if ( 'extension__' === substr( $request_key, 0, 11 ) ) {
				$extension_id = Util_Ui::config_key_from_http_name( substr( $request_key, 11 ) );

				if ( '1' === $request_value ) {
					Extensions_Util::activate_extension( $extension_id, $config, true );
				} else {
					Extensions_Util::deactivate_extension( $extension_id, $config, true );
				}
			}

			$key = Util_Ui::config_key_from_http_name( $request_key );
			if ( is_array( $key ) ) {
				$config-&gt;set( $key, $request_value );
			} elseif ( array_key_exists( $key, $keys ) ) {
				$descriptor = $keys[ $key ];
				if ( isset( $descriptor['type'] ) ) {
					if ( 'array' === $descriptor['type'] ) {
						if ( is_array( $request_value ) ) {
							$request_value = implode( &quot;\n&quot;, $request_value );
						}
						$request_value = explode( &quot;\n&quot;, str_replace( &quot;\r\n&quot;, &quot;\n&quot;, $request_value ) );
					} elseif ( 'boolean' === $descriptor['type'] ) {
						$request_value = ( '1' === $request_value );
					} elseif ( 'integer' === $descriptor['type'] ) {
						$request_value = (int) $request_value;
					}
				}

				$config-&gt;set( $key, $request_value );
			}
		}
	}
}
</textarea><br>
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