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<?php
class N2WordpressAssetInjector {
private static $nextend_js = '';
private static $nextend_css = '';
private static $priority = 100;
public static function init() {
/**
* Borlabs cache
* @url https://borlabs.io/download/
*/
if (defined('BORLABS_CACHE_SLUG') && !is_admin()) {
add_action('template_redirect', 'N2WordpressAssetInjector::outputStart', -1 * self::$priority);
add_action('shutdown', 'N2WordpressAssetInjector::closeOutputBuffers', -1 * self::$priority);
} else {
add_action('init', 'N2WordpressAssetInjector::outputStart', self::$priority);
add_action('shutdown', 'N2WordpressAssetInjector::closeOutputBuffers', -1 * self::$priority);
add_action('pp_end_html', 'N2WordpressAssetInjector::closeOutputBuffers', -10000); // ProPhoto 6 theme: we must close the buffer before the cache
add_action('headway_html_close', 'N2WordpressAssetInjector::closeOutputBuffers', self::$priority); // Headway theme
}
add_action('wp_print_scripts', 'N2WordpressAssetInjector::injectCSSComment');
/**
* Fix for Gravity Forms MC Unique ID Generator Field
* @url https://wordpress.org/plugins/gf-mc-unique-id-generator-field/
*/
if (defined('MCGFUIDGEN_PLUGIN_VERSION')) {
remove_action('init', 'mcgfuidgen_head', 0);
add_action('init', 'mcgfuidgen_head', 1000000);
}
/**
* Fix for KeyCDN cache enabled
* @url https://wordpress.org/plugins/cache-enabler/
*/
if (class_exists('Cache_Enabler', false)) {
add_action('template_redirect', function () {
ob_start("N2WordpressAssetInjector::output_callback");
}, 0);
}
/**
* Fix for Hyper Cache
* @url https://wordpress.org/plugins/hyper-cache/
*/
if (function_exists('hyper_cache_callback')) {
add_filter('cache_buffer', 'N2WordpressAssetInjector::platformRenderEnd');
}
}
public static function outputStart() {
static $started = false;
if ($started) {
return true;
}
$started = true;
if (defined('AUTOPTIMIZE_PLUGIN_DIR')) {
add_filter('autoptimize_filter_html_before_minify', array(
'N2WordpressAssetInjector',
'platformRenderEnd'
));
}
/**
* Gantry 4 improvement to use the inbuilt output filter
*/
if (defined('GANTRY_VERSION') && version_compare(GANTRY_VERSION, '4.0.0', '>=') && version_compare(GANTRY_VERSION, '5.0.0', '<')) {
if (!is_admin()) {
add_filter('gantry_before_render_output', array(
'N2WordpressAssetInjector',
'platformRenderEnd'
));
remove_action('shutdown', 'N2WordpressAssetInjector::closeOutputBuffers', -1 * self::$priority);
return true;
}
}
ob_start("N2WordpressAssetInjector::output_callback");
if (defined('SMART_SLIDER_OB_START')) {
for ($i = 0; $i < SMART_SLIDER_OB_START; $i++) {
ob_start();
}
}
/**
* Ultimate reviews open a buffer on init and tries to close it on wp_footer.
* To prevent that, lets open a new buffer which can be closed on wp_footer.
*
* @bug install Speed Contact Bar + Ultimate Reviews
* @see https://wordpress.org/plugins/ultimate-reviews/
*/
if (function_exists('EWD_URP_add_ob_start')) {
ob_start();
}
/**
* Cart66 closes our output buffer in forceDownload method
* @url http://www.cart66.com
*/
if (class_exists('Cart66')) {
ob_start();
}
return true;
}
public static function closeOutputBuffers() {
$handlers = ob_list_handlers();
if (in_array('N2WordpressAssetInjector::output_callback', $handlers)) {
for ($i = count($handlers) - 1; $i >= 0; $i--) {
ob_end_flush();
if ($handlers[$i] === 'N2WordpressAssetInjector::output_callback') {
break;
}
}
}
}
public static function output_callback($buffer, $phase) {
if ($phase & PHP_OUTPUT_HANDLER_FINAL || $phase & PHP_OUTPUT_HANDLER_END) {
return self::platformRenderEnd($buffer);
}
return $buffer;
}
public static function platformRenderEnd($buffer) {
static $once = false;
if (!$once) {
$once = true;
self::finalizeCssJs();
if (self::$nextend_css != '' && strpos($buffer, '<!--n2css-->') !== false) {
$buffer = str_replace('<!--n2css-->', self::$nextend_css, $buffer);
self::$nextend_css = '';
}
if (self::$nextend_css != '' || self::$nextend_js != '') {
$parts = preg_split('/<\/head[\s]*>/', $buffer, 2);
return implode(self::$nextend_css . self::$nextend_js . '</head>', $parts);
}
}
return $buffer;
}
public static function finalizeCssJs() {
static $finalized = false;
if (!$finalized) {
$finalized = true;
if (defined('N2LIBRARY')) {
if (class_exists('N2AssetsManager')) {
self::$nextend_css = N2AssetsManager::getCSS();
}
if (class_exists('N2AssetsManager')) {
self::$nextend_js = N2AssetsManager::getJs();
}
}
}
return true;
}
public static function injectCSSComment() {
static $once;
if (!$once) {
echo "<!--n2css-->";
$once = true;
}
}
}
N2WordpressAssetInjector::init();
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