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| 1 | <?php |
| 2 | /* |
| 3 | * This file may be called before WordPress is fully initialized. See the README file for info. |
| 4 | */ |
| 5 | |
| 6 | namespace Automattic\Jetpack_Boost\Modules\Optimizations\Page_Cache\Pre_WordPress; |
| 7 | |
| 8 | /** |
| 9 | * Cache settings class. |
| 10 | * Settings are stored in a file in the boost-cache directory. |
| 11 | */ |
| 12 | class Boost_Cache_Settings { |
| 13 | private static $instance = null; |
| 14 | private $settings = array(); |
| 15 | private $config_file_path; |
| 16 | private $config_file; |
| 17 | |
| 18 | /** |
| 19 | * An uninitialized config holds these settings. |
| 20 | * |
| 21 | * @var array |
| 22 | */ |
| 23 | private $default_settings = array( |
| 24 | 'enabled' => false, |
| 25 | 'bypass_patterns' => array(), |
| 26 | 'logging' => false, |
| 27 | ); |
| 28 | |
| 29 | private function __construct() { |
| 30 | $this->config_file_path = WP_CONTENT_DIR . '/boost-cache/'; |
| 31 | $this->config_file = $this->config_file_path . 'config.php'; |
| 32 | } |
| 33 | |
| 34 | /** |
| 35 | * Gets the instance of the class. |
| 36 | * |
| 37 | * @return Boost_Cache_Settings The instance of the class. |
| 38 | */ |
| 39 | public static function get_instance() { |
| 40 | if ( self::$instance === null ) { |
| 41 | self::$instance = new Boost_Cache_Settings(); |
| 42 | self::$instance->init_settings(); |
| 43 | } |
| 44 | |
| 45 | return self::$instance; |
| 46 | } |
| 47 | |
| 48 | /** |
| 49 | * Ensure a settings file exists, if one isn't there already. |
| 50 | * |
| 51 | * @return Boost_Cache_Error|bool - True if it was changed, or a Boost_Cache_Error on failure, false if it was already created. |
| 52 | */ |
| 53 | public function create_settings_file() { |
| 54 | if ( file_exists( $this->config_file ) ) { |
| 55 | return false; |
| 56 | } |
| 57 | |
| 58 | if ( ! file_exists( $this->config_file_path ) ) { |
| 59 | if ( ! Filesystem_Utils::create_directory( $this->config_file_path ) ) { |
| 60 | return new Boost_Cache_Error( 'failed-settings-write', 'Failed to create settings directory at ' . $this->config_file_path ); |
| 61 | } |
| 62 | } |
| 63 | |
| 64 | $write_result = $this->set( $this->default_settings ); |
| 65 | if ( $write_result instanceof Boost_Cache_Error ) { |
| 66 | return $write_result; |
| 67 | } |
| 68 | |
| 69 | return true; |
| 70 | } |
| 71 | |
| 72 | /** |
| 73 | * If an error occurs while reading the options, it will be impossible to ever log this to the Boost Cache logs. |
| 74 | * So, if WP_DEBUG is enabled write it to the error_log instead. |
| 75 | * |
| 76 | * @param string $message - The message to log. |
| 77 | */ |
| 78 | private function log_init_error( $message ) { |
| 79 | if ( defined( 'WP_DEBUG' ) && WP_DEBUG ) { |
| 80 | error_log( $message ); // phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_error_log |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | /** |
| 85 | * Load the settings from the config file, if available. Falls back to defaults if not. |
| 86 | */ |
| 87 | private function init_settings() { |
| 88 | $this->settings = $this->default_settings; |
| 89 | |
| 90 | // If no settings file exists yet, don't try to create one until we are writing a value. |
| 91 | if ( ! file_exists( $this->config_file ) ) { |
| 92 | return; |
| 93 | } |
| 94 | |
| 95 | $lines = @file( $this->config_file ); // phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged |
| 96 | if ( empty( $lines ) || count( $lines ) < 4 ) { |
| 97 | $this->log_init_error( 'Invalid config file at ' . $this->config_file ); |
| 98 | return; |
| 99 | } |
| 100 | |
| 101 | $file_settings = null; |
| 102 | foreach ( $lines as $line ) { |
| 103 | if ( strpos( $line, '{' ) !== false ) { |
| 104 | $file_settings = json_decode( $line, true ); |
| 105 | break; |
| 106 | } |
| 107 | } |
| 108 | |
| 109 | if ( ! is_array( $file_settings ) ) { |
| 110 | $this->log_init_error( 'Invalid config file at ' . $this->config_file ); |
| 111 | return false; |
| 112 | } |
| 113 | |
| 114 | $this->settings = $file_settings; |
| 115 | } |
| 116 | |
| 117 | /** |
| 118 | * Returns the value of the given setting. |
| 119 | * |
| 120 | * @param string $setting - The setting to get. |
| 121 | * @return mixed - The value of the setting, or the default if the setting does not exist. |
| 122 | */ |
| 123 | public function get( $setting, $default = false ) { |
| 124 | if ( ! isset( $this->settings[ $setting ] ) ) { |
| 125 | return $default; |
| 126 | } |
| 127 | |
| 128 | return $this->settings[ $setting ]; |
| 129 | } |
| 130 | |
| 131 | /** |
| 132 | * Returns true if the cache is enabled. |
| 133 | * |
| 134 | * @return bool |
| 135 | */ |
| 136 | public function get_enabled() { |
| 137 | return $this->get( 'enabled', false ); |
| 138 | } |
| 139 | |
| 140 | /** |
| 141 | * Returns an array of URLs that should not be cached. |
| 142 | * |
| 143 | * @return array |
| 144 | */ |
| 145 | public function get_bypass_patterns() { |
| 146 | return $this->get( 'bypass_patterns', array() ); |
| 147 | } |
| 148 | |
| 149 | /** |
| 150 | * Returns whether logging is enabled or not. |
| 151 | * |
| 152 | * @return bool |
| 153 | */ |
| 154 | public function get_logging() { |
| 155 | return $this->get( 'logging', false ); |
| 156 | } |
| 157 | |
| 158 | /** |
| 159 | * Sets the given settings, and saves them to the config file. |
| 160 | * |
| 161 | * @param array $settings - The settings to set in a key => value associative |
| 162 | * array. This will be merged with the existing settings. |
| 163 | * Example: |
| 164 | * $result = $this->set( array( 'enabled' => true ) ); |
| 165 | * |
| 166 | * @return Boost_Cache_Error|true - true if the settings were saved, Boost_Cache_Error otherwise. |
| 167 | */ |
| 168 | public function set( $settings ) { |
| 169 | // If the settings file does not exist, attempt to create one. |
| 170 | if ( ! file_exists( $this->config_file_path ) ) { |
| 171 | $result = $this->create_settings_file(); |
| 172 | if ( $result instanceof Boost_Cache_Error ) { |
| 173 | return $result; |
| 174 | } |
| 175 | } |
| 176 | |
| 177 | if ( ! is_writable( $this->config_file_path ) ) { // phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_operations_is_writable |
| 178 | $error = new Boost_Cache_Error( 'failed-settings-write', 'Could not write to the config file at ' . $this->config_file_path ); |
| 179 | Logger::debug( $error->get_error_message() ); |
| 180 | return $error; |
| 181 | } |
| 182 | |
| 183 | $this->settings = array_merge( $this->settings, $settings ); |
| 184 | |
| 185 | $contents = "<?php die();\n/*\n * Configuration data for Jetpack Boost Cache. Do not edit.\n" . json_encode( // phpcs:ignore WordPress.WP.AlternativeFunctions.json_encode_json_encode |
| 186 | $this->settings, |
| 187 | JSON_HEX_TAG // Need to escape slashes because this is, for some reason, going into a PHP comment and we need to guard against `*/`. |
| 188 | ) . "\n */"; |
| 189 | $result = Filesystem_Utils::write_to_file( $this->config_file, $contents ); |
| 190 | if ( $result instanceof Boost_Cache_Error ) { |
| 191 | Logger::debug( $result->get_error_message() ); |
| 192 | return new Boost_Cache_Error( 'failed-settings-write', 'Failed to write settings file: ' . $result->get_error_message() ); |
| 193 | } |
| 194 | |
| 195 | return true; |
| 196 | } |
| 197 | } |