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<?php |
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|
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if (!defined('WPO_VERSION')) die('No direct access allowed'); |
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|
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require_once 'class-wp-optimize-htaccess.php'; |
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|
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/** |
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* Class WP_Optimize_Browser_Cache |
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*/ |
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class WP_Optimize_Browser_Cache { |
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|
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private $_htaccess = null; |
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|
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private $_options = null; |
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|
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private $_wp_optimize = null; |
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|
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/** |
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* Browser cache section in htaccess will wrapped with this comment |
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* |
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* @var string |
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*/ |
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private $_htaccess_section_comment = 'WP-Optimize Browser Cache'; |
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|
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/** |
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* WP_Optimize_Browser_Cache constructor. |
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*/ |
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public function __construct() { |
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$this->_wp_optimize = WP_Optimize(); |
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|
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$this->_htaccess = new WP_Optimize_Htaccess(); |
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|
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$this->_options = $this->_wp_optimize->get_options(); |
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} |
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|
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/*** |
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* Check headers for Cache-Control and Etag. And if they are exist return true. |
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* |
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* @return bool|WP_Error |
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*/ |
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public function is_cache_enabled() { |
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$style = get_template_directory_uri() . '/style.css'; |
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|
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$response = wp_remote_get($style, array('timeout' => 15)); |
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|
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if (is_a($response, 'WP_Error')) return $response; |
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|
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$headers = wp_remote_retrieve_headers($response); |
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|
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if (is_a($headers, 'Requests_Utility_CaseInsensitiveDictionary')) { |
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$headers = $headers->getAll(); |
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} |
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|
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if (false === array_key_exists('etag', $headers) && array_key_exists('cache-control', $headers)) { |
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return true; |
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} |
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|
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if ($this->is_browser_cache_section_exists() && !$this->_wp_optimize->is_apache_module_loaded(array('mod_expires', 'mod_headers'))) { |
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return new WP_Error('Browser cache', __('We successfully updated your .htaccess file. But it seems one of Apache modules - mod_expires or mod_headers is not active.', 'wp-optimize')); |
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} |
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|
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return false; |
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} |
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|
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/** |
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* Enable browser cache - add settings into .htaccess. |
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* |
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* @param string $expiry_time |
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*/ |
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public function enable($expiry_time = '1 month') { |
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$this->_htaccess->update_commented_section($this->prepare_browser_cache_section($expiry_time), $this->_htaccess_section_comment); |
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$this->_htaccess->write_file(); |
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} |
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|
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/** |
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* Disable cache - remove settings from .htaccess added in enable() function. |
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*/ |
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public function disable() { |
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$this->_htaccess->remove_commented_section($this->_htaccess_section_comment); |
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$this->_htaccess->write_file(); |
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} |
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|
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/** |
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* Check if section with browser cache settings already exists. |
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*/ |
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public function is_browser_cache_section_exists() { |
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return $this->_htaccess->is_commented_section_exists($this->_htaccess_section_comment); |
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} |
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|
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/** |
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* Handle for enable_browser_cache command used in WP_Optimize_Commands. |
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* |
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* @param array $params - ['browser_cache_expire' => '1 month 15 days 2 hours' || '' - for disable cache] |
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* @return array |
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*/ |
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public function enable_browser_cache_command_handler($params) { |
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$expire_days = isset($params['browser_cache_expire_days']) ? $params['browser_cache_expire_days'] : ''; |
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$expire_hours = isset($params['browser_cache_expire_hours']) ? $params['browser_cache_expire_hours'] : ''; |
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|
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$current_expire_days = $this->_options->get_option('browser_cache_expire_days', ''); |
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$current_expire_hours = $this->_options->get_option('browser_cache_expire_hours', ''); |
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|
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$section_updated = false; |
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|
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$expiry_time = $this->prepare_interval($expire_days, $expire_hours); |
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|
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$enable = ('' == $expiry_time) ? false : true; |
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|
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/** |
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* If we don't need to do anything in .htaccess then return message. |
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*/ |
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if ($enable == $this->_htaccess->is_commented_section_exists() && $expire_days == $current_expire_days && $expire_hours == $current_expire_hours) { |
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$message = __('Browser static caching settings already exists in the .htaccess file', 'wp-optimize'); |
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|
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return array( |
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'success' => true, |
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'enabled' => $enable, |
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'message' => $message, |
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); |
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} |
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|
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if ($this->_htaccess->is_writable()) { |
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// update commented section |
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|
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if ($enable) { |
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$this->enable($expiry_time); |
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} else { |
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$this->disable(); |
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} |
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|
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// read updated file. |
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$this->_htaccess->read_file(); |
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// check if section added or removed successfully. |
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$section_exists = $this->_htaccess->is_commented_section_exists(); |
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// set correct $section-updated flag. |
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$section_updated = $enable === $section_exists; |
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} |
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|
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if ($section_updated) { |
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$enabled = $this->is_cache_enabled(); |
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|
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// save $expire value to options. |
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$this->_options->update_option('browser_cache_expire_days', $expire_days); |
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$this->_options->update_option('browser_cache_expire_hours', $expire_hours); |
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|
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if (is_wp_error($enabled)) { |
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return array( |
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'success' => true, |
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'enabled' => $enabled, |
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'error_message' => $enabled->get_error_message(), |
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); |
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} else { |
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return array( |
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'success' => true, |
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'enabled' => $enabled, |
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'message' => __('We successfully updated your .htaccess file.', 'wp-optimize'), |
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); |
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} |
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} else { |
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$cache_section = $this->prepare_browser_cache_section($expiry_time); |
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|
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if ($enable) { |
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$message = sprintf(__('We can\'t update your %s file. Please try to add following lines manually:', 'wp-optimize'), $this->_htaccess->get_filename()); |
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$output = htmlentities($this->_htaccess->get_section_begin_comment() . PHP_EOL . |
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join(PHP_EOL, $this->_htaccess->get_flat_array($cache_section)). |
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PHP_EOL . $this->_htaccess->get_section_end_comment()); |
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} else { |
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$message = sprintf(__('We can\'t update your %s file. Please try to remove following lines manually:', 'wp-optimize'), $this->_htaccess->get_filename()); |
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$output = htmlentities($this->_htaccess->get_section_begin_comment() . PHP_EOL . |
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' ... ... ... '. |
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PHP_EOL . $this->_htaccess->get_section_end_comment()); |
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} |
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|
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return array( |
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'success' => false, |
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'enabled' => $this->is_cache_enabled(), |
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'error_message' => $message, |
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'output' => $output, |
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); |
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} |
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} |
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|
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/** |
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* Use $days an $hours values to build correct time interval as a string like '2 days 3 hours' or empty string if date is empty. |
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* |
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* @param int $days |
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* @param int $hours |
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* @return string |
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*/ |
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private function prepare_interval($days, $hours) { |
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|
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$days = floor($days); |
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$hours = floor($hours); |
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|
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if (0 == $days && 0 == $hours) { |
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return ''; |
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} |
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|
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$parts = array(); |
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|
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// if hours value more than one day then fix it. |
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$days += floor($hours / 24); |
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$hours = $hours % 24; |
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|
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$years = floor($days / 365); |
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$days = $days % 365; |
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$months = floor($days / 30); |
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$days = $days % 30; |
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|
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if ($years > 0) { |
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$parts[] = $years . ($years > 1 ? ' years' : ' year'); |
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} |
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|
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if ($months > 0) { |
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$parts[] = $months . ($months > 1 ? ' months' : ' month'); |
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} |
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|
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if ($days > 0) { |
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$parts[] = $days . ($days > 1 ? ' days' : ' day'); |
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} |
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|
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if ($hours > 0) { |
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$parts[] = $hours . ($hours > 1 ? ' hours' : ' hour'); |
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} |
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|
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return join(' ', $parts); |
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} |
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|
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/** |
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* Build browser cache section array. |
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* |
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* @param string $expire - value like - 1 day 12 hours 15 minutes |
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* @return array |
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*/ |
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public function prepare_browser_cache_section($expire) { |
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return array( |
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array( |
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'<IfModule mod_expires.c>', |
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'ExpiresActive On', |
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'ExpiresByType text/css "access '.$expire.'"', |
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'ExpiresByType text/html "access '.$expire.'"', |
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'ExpiresByType image/gif "access '.$expire.'"', |
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'ExpiresByType image/png "access '.$expire.'"', |
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'ExpiresByType image/jpg "access '.$expire.'"', |
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'ExpiresByType image/jpeg "access '.$expire.'"', |
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'ExpiresByType image/webp "access '.$expire.'"', |
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'ExpiresByType image/x-icon "access '.$expire.'"', |
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'ExpiresByType application/pdf "access '.$expire.'"', |
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'ExpiresByType application/javascript "access '.$expire.'"', |
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'ExpiresByType text/x-javascript "access '.$expire.'"', |
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'ExpiresByType application/x-shockwave-flash "access '.$expire.'"', |
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'ExpiresDefault "access '.$expire.'"', |
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'</IfModule>', |
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), |
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'', |
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array( |
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'<IfModule mod_headers.c>', |
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array( |
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'<filesMatch "\.(ico|jpe?g|png|gif|webp|swf)$">', |
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'Header set Cache-Control "public"', |
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'</filesMatch>', |
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), |
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array( |
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'<filesMatch "\.(css)$">', |
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'Header set Cache-Control "public"', |
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'</filesMatch>', |
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), |
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array( |
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'<filesMatch "\.(js)$">', |
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'Header set Cache-Control "private"', |
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'</filesMatch>', |
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), |
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array( |
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'<filesMatch "\.(x?html?|php)$">', |
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'Header set Cache-Control "private, must-revalidate"', |
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'</filesMatch>', |
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), |
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'</IfModule>', |
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), |
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'', |
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'#Disable ETag', |
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'FileETag None', |
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); |
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} |
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} |
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|
