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

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+<?php
+namespace WpAssetCleanUp\OptimiseAssets;
+
+/**
+ * Class DynamicLoadedAssets
+ * @package WpAssetCleanUp
+ */
+class DynamicLoadedAssets
+{
+	/**
+	 * @param $from
+	 * @param $value
+	 *
+	 * @return bool|mixed|string
+	 */
+	public static function getAssetContentFrom($from, $value)
+	{
+		$assetContent = '';
+
+		if ($from === 'simple-custom-css') {
+			/*
+			 * Special Case: "Simple Custom CSS" Plugin
+			 *
+			 * /?sccss=1
+			 *
+			 * As it is (no minification or optimization), it adds extra load time to the page
+			 * as the CSS is read via PHP and all the WP environment is loading
+			 */
+			if (! $assetContent = self::getSimpleCustomCss()) {
+				return false;
+			}
+		}
+
+		if ($from === 'dynamic') { // /? .php? etc.
+			if (! OptimizeCommon::isSourceFromSameHost($value->src)) {
+				return array();
+			}
+
+			$response = wp_remote_get(
+				$value->src
+				);
+
+			if (wp_remote_retrieve_response_code($response) !== 200) {
+				return false;
+			}
+
+			if (! $assetContent = wp_remote_retrieve_body($response)) {
+				return false;
+			}
+		}
+
+		return $assetContent;
+	}
+
+	/**
+	 * "Simple Custom CSS" (better retrieval, especially for localhost and password-protected sites)
+	 *
+	 * @return string
+	 */
+	public static function getSimpleCustomCss()
+	{
+		$sccssOptions    = get_option('sccss_settings');
+		$sccssRawContent = isset($sccssOptions['sccss-content']) ? $sccssOptions['sccss-content'] : '';
+		$cssContent      = wp_kses($sccssRawContent, array('\'', '\"'));
+		$cssContent      = str_replace('&gt;', '>', $cssContent);
+
+		return trim($cssContent);
+	}
+}