first commit

system/library/response.php

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+<?php
+/**
+ * @package		OpenCart
+ * @author		Daniel Kerr
+ * @copyright	Copyright (c) 2005 - 2022, OpenCart, Ltd. (https://www.opencart.com/)
+ * @license		https://opensource.org/licenses/GPL-3.0
+ * @link		https://www.opencart.com
+*/
+namespace Opencart\System\Library;
+/**
+ * Class Response
+ *
+ * Stores the response so the correct headers can go out before the response output is shown.
+ *
+ */
+class Response {
+	/**
+	 * @var array
+	 */
+	private array $headers = [];
+	/**
+	 * @var int
+	 */
+	private int $level = 0;
+	/**
+	 * @var string
+	 */
+	private string $output = '';
+
+	/**
+	 * Constructor
+	 *
+	 * @param	string	$header
+	 *
+ 	*/
+	public function addHeader(string $header): void {
+		$this->headers[] = $header;
+	}
+
+	/**
+	 * Get Headers
+	 *
+	 * @param	array
+	 *
+ 	*/
+	public function getHeaders(): array {
+		return $this->headers;
+	}
+
+	/**
+	 * Redirect
+	 *
+	 * @param	string	$url
+	 * @param	int		$status
+	 *
+ 	*/
+	public function redirect(string $url, int $status = 302): void {
+		header('Location: ' . str_replace(['&amp;', "\n", "\r"], ['&', '', ''], $url), true, $status);
+		exit();
+	}
+
+	/**
+	 * Set Compression
+	 *
+	 * @param	int		$level
+ 	*/
+	public function setCompression(int $level): void {
+		$this->level = $level;
+	}
+
+	/**
+	 * Set Output
+	 *
+	 * @param	string	$output
+ 	*/	
+	public function setOutput(string $output): void {
+		$this->output = $output;
+	}
+
+	/**
+	 * Get Output
+	 *
+	 * @return	array
+	 */
+	public function getOutput(): string {
+		return $this->output;
+	}
+
+	/**
+	 * Compress
+	 *
+	 * @param	string	$data
+	 * @param	int		$level
+	 * 
+	 * @return	string
+ 	*/
+	private function compress(string $data, int $level = 0): string {
+		if (isset($_SERVER['HTTP_ACCEPT_ENCODING']) && (strpos($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip') !== false)) {
+			$encoding = 'gzip';
+		}
+
+		if (isset($_SERVER['HTTP_ACCEPT_ENCODING']) && (strpos($_SERVER['HTTP_ACCEPT_ENCODING'], 'x-gzip') !== false)) {
+			$encoding = 'x-gzip';
+		}
+
+		if (!isset($encoding) || ($level < -1 || $level > 9)) {
+			return $data;
+		}
+
+		if (!extension_loaded('zlib') || ini_get('zlib.output_compression')) {
+			return $data;
+		}
+
+		if (headers_sent()) {
+			return $data;
+		}
+
+		if (connection_status()) {
+			return $data;
+		}
+
+		$this->addHeader('Content-Encoding: ' . $encoding);
+
+		return gzencode($data, $level);
+	}
+
+	/**
+	 * Output
+	 *
+	 * Displays the set HTML output
+ 	*/
+	public function output(): void {
+		if ($this->output) {
+			$output = $this->level ? $this->compress($this->output, $this->level) : $this->output;
+
+			if (!headers_sent()) {
+				foreach ($this->headers as $header) {
+					header($header, true);
+				}
+			}
+
+			echo $output;
+		}
+	}
+}