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libraries/f0f/download/adapter/fopen.php

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+<?php
+/**
+ * @package     FrameworkOnFramework
+ * @subpackage  dispatcher
+ * @copyright   Copyright (C) 2010-2016 Nicholas K. Dionysopoulos / Akeeba Ltd. All rights reserved.
+ * @license     GNU General Public License version 2 or later; see LICENSE.txt
+ */
+// Protect from unauthorized access
+defined('F0F_INCLUDED') or die;
+
+/**
+ * A download adapter using URL fopen() wrappers
+ */
+class F0FDownloadAdapterFopen extends F0FDownloadAdapterAbstract implements F0FDownloadInterface
+{
+	public function __construct()
+	{
+		$this->priority = 100;
+		$this->supportsFileSize = false;
+		$this->supportsChunkDownload = true;
+		$this->name = 'fopen';
+
+		// If we are not allowed to use ini_get, we assume that URL fopen is
+		// disabled.
+		if (!function_exists('ini_get'))
+		{
+			$this->isSupported = false;
+		}
+		else
+		{
+			$this->isSupported = ini_get('allow_url_fopen');
+		}
+	}
+
+	/**
+	 * Download a part (or the whole) of a remote URL and return the downloaded
+	 * data. You are supposed to check the size of the returned data. If it's
+	 * smaller than what you expected you've reached end of file. If it's empty
+	 * you have tried reading past EOF. If it's larger than what you expected
+	 * the server doesn't support chunk downloads.
+	 *
+	 * If this class' supportsChunkDownload returns false you should assume
+	 * that the $from and $to parameters will be ignored.
+	 *
+	 * @param   string   $url     The remote file's URL
+	 * @param   integer  $from    Byte range to start downloading from. Use null for start of file.
+	 * @param   integer  $to      Byte range to stop downloading. Use null to download the entire file ($from is ignored)
+	 * @param   array    $params  Additional params that will be added before performing the download
+	 *
+	 * @return  string  The raw file data retrieved from the remote URL.
+	 *
+	 * @throws  Exception  A generic exception is thrown on error
+	 */
+	public function downloadAndReturn($url, $from = null, $to = null, array $params = array())
+	{
+		if (empty($from))
+		{
+			$from = 0;
+		}
+
+		if (empty($to))
+		{
+			$to = 0;
+		}
+
+		if ($to < $from)
+		{
+			$temp = $to;
+			$to   = $from;
+			$from = $temp;
+
+			unset($temp);
+		}
+
+		if (!(empty($from) && empty($to)))
+		{
+			$options = array(
+				'http'	=> array(
+					'method'	=> 'GET',
+					'header'	=> "Range: bytes=$from-$to\r\n"
+				),
+				'ssl' => array(
+					'verify_peer'   => true,
+					'cafile'        => __DIR__ . '/cacert.pem',
+					'verify_depth'  => 5,
+				)
+			);
+
+			$options = array_merge($options, $params);
+
+			$context = stream_context_create($options);
+			$result  = @file_get_contents($url, false, $context, $from - $to + 1);
+		}
+		else
+		{
+			$options = array(
+				'http'	=> array(
+					'method'	=> 'GET',
+				),
+				'ssl' => array(
+					'verify_peer'   => true,
+					'cafile'        => __DIR__ . '/cacert.pem',
+					'verify_depth'  => 5,
+				)
+			);
+
+			$options = array_merge($options, $params);
+
+			$context = stream_context_create($options);
+			$result  = @file_get_contents($url, false, $context);
+		}
+
+		if ($result === false)
+		{
+			$error = JText::sprintf('LIB_FOF_DOWNLOAD_ERR_HTTPERROR');
+			throw new Exception($error, 1);
+		}
+		else
+		{
+			return $result;
+		}
+	}
+}