first commit

wp-content/plugins/akeebabackupwp/app/Solo/Model/Json/Task/DownloadDirect.php

@@ -0,0 +1,172 @@
+<?php
+/**
+ * @package    solo
+ * @copyright  Copyright (c)2014-2019 Nicholas K. Dionysopoulos / Akeeba Ltd
+ * @license    GNU GPL version 3 or later
+ */
+
+namespace Solo\Model\Json\Task;
+
+use Akeeba\Engine\Factory;
+use Akeeba\Engine\Platform;
+use Awf\Application\Application;
+use Solo\Model\Json\TaskInterface;
+
+/**
+ * Download an entire backup archive directly over HTTP
+ */
+class DownloadDirect implements TaskInterface
+{
+	/**
+	 * Return the JSON API task's name ("method" name). Remote clients will use it to call us.
+	 *
+	 * @return  string
+	 */
+	public function getMethodName()
+	{
+		return 'downloadDirect';
+	}
+
+	/**
+	 * Execute the JSON API task
+	 *
+	 * @param   array $parameters The parameters to this task
+	 *
+	 * @return  mixed
+	 *
+	 * @throws  \RuntimeException  In case of an error
+	 */
+	public function execute(array $parameters = array())
+	{
+		// Get the passed configuration values
+		$defConfig = array(
+			'backup_id' => 0,
+			'part_id'   => 1,
+		);
+
+		$defConfig = array_merge($defConfig, $parameters);
+
+		$backup_id = (int)$defConfig['backup_id'];
+		$part_id   = (int)$defConfig['part_id'];
+
+		$container = Application::getInstance()->getContainer();
+
+		$backup_stats = Platform::getInstance()->get_statistics($backup_id);
+
+		if (empty($backup_stats))
+		{
+			// Backup record doesn't exist
+			@ob_end_clean();
+			header('HTTP/1.1 500 Invalid backup record identifier');
+			flush();
+
+			$container->application->close();
+		}
+
+		$files = Factory::getStatistics()->get_all_filenames($backup_stats);
+
+		if ((count($files) < $part_id) || ($part_id <= 0))
+		{
+			// Invalid part
+			@ob_end_clean();
+			header('HTTP/1.1 500 Invalid backup part');
+			flush();
+
+			$container->application->close();
+		}
+
+		$filename = $files[ $part_id - 1 ];
+		@clearstatcache();
+
+		// For a certain unmentionable browser
+		if (function_exists('ini_get') && function_exists('ini_set'))
+		{
+			if (ini_get('zlib.output_compression'))
+			{
+				ini_set('zlib.output_compression', 'Off');
+			}
+		}
+
+		// Remove php's time limit
+		if (function_exists('ini_get') && function_exists('set_time_limit'))
+		{
+			if (!ini_get('safe_mode'))
+			{
+				@set_time_limit(0);
+			}
+		}
+
+		$basename  = @basename($filename);
+		$fileSize  = @filesize($filename);
+		$extension = strtolower(str_replace(".", "", strrchr($filename, ".")));
+
+		while (@ob_end_clean())
+		{
+			;
+		}
+		@clearstatcache();
+		// Send MIME headers
+		header('MIME-Version: 1.0');
+		header('Content-Disposition: attachment; filename="' . $basename . '"');
+		header('Content-Transfer-Encoding: binary');
+		header('Accept-Ranges: bytes');
+
+		switch ($extension)
+		{
+			case 'zip':
+				// ZIP MIME type
+				header('Content-Type: application/zip');
+				break;
+
+			default:
+				// Generic binary data MIME type
+				header('Content-Type: application/octet-stream');
+				break;
+		}
+
+		// Notify of file size, if this info is available
+		if ($fileSize > 0)
+		{
+			header('Content-Length: ' . @filesize($filename));
+		}
+
+		// Disable caching
+		header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
+		header("Expires: 0");
+		header('Pragma: no-cache');
+		flush();
+
+		if ($fileSize > 0)
+		{
+			// If the filesize is reported, use 1M chunks for echoing the data to the browser
+			$blockSize = 1048576; //1M chunks
+			$handle    = @fopen($filename, "r");
+
+			// Now we need to loop through the file and echo out chunks of file data
+			if ($handle !== false)
+			{
+				while (!@feof($handle))
+				{
+					echo @fread($handle, $blockSize);
+					@ob_flush();
+					flush();
+				}
+			}
+
+			if ($handle !== false)
+			{
+				@fclose($handle);
+			}
+		}
+		else
+		{
+			// If the filesize is not reported, hope that readfile works
+			@readfile($filename);
+		}
+
+		flush();
+
+		$container->application->close();
+
+	}
+}