add wp-rocket

wp-content/plugins/wp-rocket/inc/Engine/Optimization/DelayJS/HTML.php

@@ -0,0 +1,175 @@
+<?php
+
+namespace WP_Rocket\Engine\Optimization\DelayJS;
+
+use WP_Rocket\Admin\Options_Data;
+
+class HTML {
+
+	/**
+	 * Plugin options instance.
+	 *
+	 * @since  3.7
+	 *
+	 * @var Options_Data
+	 */
+	protected $options;
+
+	/**
+	 * Allowed scripts regex.
+	 *
+	 * @since 3.7
+	 *
+	 * @var string
+	 */
+	private $allowed_scripts = '';
+
+	/**
+	 * Creates an instance of HTML.
+	 *
+	 * @since  3.7
+	 *
+	 * @param Options_Data $options Plugin options instance.
+	 */
+	public function __construct( Options_Data $options ) {
+		$this->options = $options;
+	}
+
+	/**
+	 * Adjust HTML to have delay js structure.
+	 *
+	 * @param string $html Buffer html for the page.
+	 *
+	 * @return string
+	 */
+	public function delay_js( $html ) {
+
+		if ( ! $this->is_allowed() ) {
+			return $html;
+		}
+
+		$this->allowed_scripts = $this->prepare_allowed_scripts_regex();
+
+		if ( empty( $this->allowed_scripts ) ) {
+			return $html;
+		}
+
+		return $this->parse( $html );
+	}
+
+	/**
+	 * Checks if is allowed to Delay JS.
+	 *
+	 * @since 3.7
+	 *
+	 * @return bool
+	 */
+	public function is_allowed() {
+		if ( rocket_bypass() ) {
+			return false;
+		}
+
+		if ( rocket_get_constant( 'DONOTROCKETOPTIMIZE' ) ) {
+			return false;
+		}
+
+		if ( is_rocket_post_excluded_option( 'delay_js' ) ) {
+			return false;
+		}
+
+		return (bool) $this->options->get( 'delay_js', 0 );
+	}
+
+	/**
+	 * Parse the html and add/remove attributes from specific scripts.
+	 *
+	 * @param string $html Buffer html for the page.
+	 *
+	 * @return string
+	 */
+	private function parse( $html ) {
+		$replaced_html = preg_replace_callback( '/<script\s*(?<attr>[^>]*)?>(?<content>.*)?<\/script>/Uims', [ $this, 'replace_scripts' ], $html );
+
+		if ( empty( $replaced_html ) ) {
+			return $html;
+		}
+
+		return $replaced_html;
+	}
+
+	/**
+	 * Callback method for preg_replace_callback that is used to adjust attributes for specific scripts.
+	 *
+	 * @param array $matches Matches array for scripts regex.
+	 *
+	 * @return string
+	 */
+	public function replace_scripts( $matches ) {
+		if (
+			empty( $this->allowed_scripts )
+			||
+			(
+				! empty( $this->allowed_scripts )
+				&&
+				! preg_match( '#(' . $this->allowed_scripts . ')#', $matches[0] )
+			)
+		) {
+			return $matches[0];
+		}
+
+		$src             = '';
+		$matches['attr'] = trim( $matches['attr'] );
+
+		if ( ! empty( $matches['attr'] ) ) {
+			if ( preg_match( '/src=(["\'])(.*?)\1/', $matches['attr'], $src_matches ) ) {
+				$src = $src_matches[2];
+
+				// Remove the src attribute.
+				$matches['attr'] = str_replace( $src_matches[0], '', $matches['attr'] );
+			}
+		}
+
+		if ( empty( $src ) ) {
+			// Get the JS content.
+			if ( ! empty( $matches['content'] ) ) {
+				$src = 'data:text/javascript;base64,' . base64_encode( $matches['content'] );// phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions.obfuscation_base64_encode
+			}
+		}
+
+		if ( empty( $src ) ) {
+			return $matches[0];
+		}
+
+		return "<script data-rocketlazyloadscript='{$src}' {$matches['attr']}></script>";
+	}
+
+	/**
+	 * Prepare allowed scripts to be used as regex.
+	 *
+	 * @return string
+	 */
+	private function prepare_allowed_scripts_regex() {
+		$delay_js_scripts = $this->options->get( 'delay_js_scripts', [] );
+
+		/**
+		 * Filters JS files to included into delay JS.
+		 *
+		 * @since 3.7
+		 *
+		 * @param array $delay_js_scripts List of allowed JS files.
+		 */
+		$delay_js_scripts = (array) apply_filters( 'rocket_delay_js_scripts', $delay_js_scripts );
+
+		if ( empty( $delay_js_scripts ) ) {
+			return '';
+		}
+
+		foreach ( $delay_js_scripts as $i => $delay_js_script ) {
+			$delay_js_scripts[ $i ] = preg_quote( str_replace( '#', '\#', $delay_js_script ), '#' );
+		}
+
+		return implode( '|', $delay_js_scripts );
+
+	}
+
+}