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wp-content/plugins/wp-asset-clean-up/classes/OptimiseAssets/FontsLocal.php

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+<?php
+namespace WpAssetCleanUp\OptimiseAssets;
+
+use WpAssetCleanUp\Main;
+use WpAssetCleanUp\Plugin;
+
+/**
+ * Class LocalFonts
+ * @package WpAssetCleanUp\OptimiseAssets
+ */
+class FontsLocal
+{
+	/**
+	 *
+	 */
+	public function init()
+	{
+		if (self::preventAnyChange()) {
+			return;
+		}
+
+		add_action('wp_head', array($this, 'preloadFontFiles'), 1);
+	}
+
+	/**
+	 *
+	 */
+	public function preloadFontFiles()
+	{
+		// AMP page or Test Mode? Do not print anything
+		if ( Plugin::preventAnyFrontendOptimization() || Main::isTestModeActive() ) {
+			return;
+		}
+
+		if (! $preloadFontFiles = trim(Main::instance()->settings['local_fonts_preload_files'])) {
+			return;
+		}
+
+		$preloadFontFilesArray = array();
+
+		if (strpos($preloadFontFiles, "\n") !== false) {
+			foreach (explode("\n", $preloadFontFiles) as $preloadFontFile) {
+				$preloadFontFile = trim($preloadFontFile);
+
+				if (! $preloadFontFile) {
+					continue;
+				}
+
+				$preloadFontFilesArray[] = $preloadFontFile;
+			}
+		} else {
+			$preloadFontFilesArray[] = $preloadFontFiles;
+		}
+
+		$preloadFontFilesArray = array_unique($preloadFontFilesArray);
+
+		$preloadFontFilesOutput = '';
+
+		// Finally, go through the list
+		foreach ($preloadFontFilesArray as $preloadFontFile) {
+			$preloadFontFilesOutput .= '<link rel="preload" as="font" href="'.esc_attr($preloadFontFile).'" data-wpacu-preload-font="1" crossorigin>'."\n";
+		}
+
+		echo apply_filters('wpacu_preload_local_font_files_output', $preloadFontFilesOutput);
+	}
+
+	/**
+	 * @return bool
+	 */
+	public static function preventAnyChange()
+	{
+		if (defined('WPACU_ALLOW_ONLY_UNLOAD_RULES') && WPACU_ALLOW_ONLY_UNLOAD_RULES) {
+			return true;
+		}
+
+		return false;
+	}
+}