installed plugin W3 Total Cache version 2.3.2

wp-content/plugins/w3-total-cache/Util_Content.php

@@ -0,0 +1,110 @@
+<?php
+namespace W3TC;
+
+class Util_Content {
+	/**
+	 * Check if content is HTML
+	 *
+	 * @param string  $content
+	 * @return boolean
+	 */
+	static public function is_html( $content ) {
+		$content = Util_Content::_is_html_prepare( $content );
+		return stripos( $content, '<html' ) === 0 ||
+			stripos( $content, '<!DOCTYPE' ) === 0;
+	}
+
+	/**
+	 * Check if content is HTML or XML
+	 *
+	 * @param string  $content
+	 * @return boolean
+	 */
+	static public function is_html_xml( $content ) {
+		$content = Util_Content::_is_html_prepare( $content );
+		return stripos( $content, '<?xml' ) === 0 ||
+			stripos( $content, '<html' ) === 0 ||
+			stripos( $content, '<!DOCTYPE' ) === 0;
+	}
+
+	static private function _is_html_prepare( $content ) {
+		if ( strlen( $content ) > 1000 ) {
+			$content = substr( $content, 0, 1000 );
+		}
+
+		if ( strstr( $content, '<!--' ) !== false ) {
+			$content = preg_replace( '~<!--.*?-->~s', '', $content );
+		}
+
+		$content = ltrim( $content, "\x00\x09\x0A\x0D\x20\xBB\xBF\xEF" );
+		return $content;
+	}
+
+	/**
+	 * If content can handle HTML comments, can disable printout per request using filter 'w3tc_can_print_comment'
+	 *
+	 * @param unknown $buffer
+	 * @return bool
+	 */
+	static public function can_print_comment( $buffer ) {
+		if ( function_exists( 'apply_filters' ) )
+			return apply_filters( 'w3tc_can_print_comment', Util_Content::is_html_xml( $buffer ) && !defined( 'DOING_AJAX' ) );
+		return Util_Content::is_html_xml( $buffer ) && !defined( 'DOING_AJAX' );
+	}
+
+	/**
+	 * Returns GMT date
+	 *
+	 * @param integer $time
+	 * @return string
+	 */
+	static public function http_date( $time ) {
+		return gmdate( 'D, d M Y H:i:s \G\M\T', $time );
+	}
+
+	/**
+	 * Escapes HTML comment
+	 *
+	 * @param string  $comment
+	 * @return mixed
+	 */
+	static public function escape_comment( $comment ) {
+		while ( strstr( $comment, '--' ) !== false ) {
+			$comment = str_replace( '--', '- -', $comment );
+		}
+
+		return $comment;
+	}
+
+
+
+	/**
+	 * Deprecated. Added to prevent loading-order errors during upgrades
+	 * from older w3tc plugin versions
+	 **/
+	static public function is_database_error() {
+		return false;
+	}
+
+
+
+	/**
+	 * Converts
+	 * 127.0.0.1:1234 to ( '123.0.0.1', 1234 )
+	 * tls://127.0.0.1:1234 to ( 'tls://123.0.0.1', 1234 )
+	 * unix:/my/pipe to ( 'unix:/my/pipe', 0 )
+	 *
+	 * Doesnt fit to that class perfectly but selected due to common usage
+	 * of loaded classes
+	 */
+	static public function endpoint_to_host_port( $server, $port_default = 0 ) {
+		$p = strrpos( $server, ':' );
+		if ( substr( $server, 0, 5 ) == 'unix:' || $p === false ) {
+			return array( trim( $server ), $port_default );
+		}
+
+		return array(
+			trim( substr( $server, 0, $p ) ),
+			(int)substr( $server, $p + 1 ) );
+	}
+}