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libraries/fof30/Download/Adapter/AbstractAdapter.php

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+<?php
+/**
+ * @package   FOF
+ * @copyright Copyright (c)2010-2021 Nicholas K. Dionysopoulos / Akeeba Ltd
+ * @license   GNU General Public License version 2, or later
+ */
+
+namespace FOF30\Download\Adapter;
+
+defined('_JEXEC') || die;
+
+use FOF30\Download\DownloadInterface;
+use FOF30\Download\Exception\DownloadError;
+
+abstract class AbstractAdapter implements DownloadInterface
+{
+	/**
+	 * Load order priority
+	 *
+	 * @var  int
+	 */
+	public $priority = 100;
+
+	/**
+	 * Name of the adapter (identical to filename)
+	 *
+	 * @var  string
+	 */
+	public $name = '';
+
+	/**
+	 * Is this adapter supported in the current execution environment?
+	 *
+	 * @var  bool
+	 */
+	public $isSupported = false;
+
+	/**
+	 * Does this adapter support chunked downloads?
+	 *
+	 * @var  bool
+	 */
+	public $supportsChunkDownload = false;
+
+	/**
+	 * Does this adapter support querying the remote file's size?
+	 *
+	 * @var  bool
+	 */
+	public $supportsFileSize = false;
+
+	/**
+	 * Does this download adapter support downloading files in chunks?
+	 *
+	 * @return  boolean  True if chunk download is supported
+	 */
+	public function supportsChunkDownload()
+	{
+		return $this->supportsChunkDownload;
+	}
+
+	/**
+	 * Does this download adapter support reading the size of a remote file?
+	 *
+	 * @return  boolean  True if remote file size determination is supported
+	 */
+	public function supportsFileSize()
+	{
+		return $this->supportsFileSize;
+	}
+
+	/**
+	 * Is this download class supported in the current server environment?
+	 *
+	 * @return  boolean  True if this server environment supports this download class
+	 */
+	public function isSupported()
+	{
+		return $this->isSupported;
+	}
+
+	/**
+	 * Get the priority of this adapter. If multiple download adapters are
+	 * supported on a site, the one with the highest priority will be
+	 * used.
+	 *
+	 * @return  boolean
+	 */
+	public function getPriority()
+	{
+		return $this->priority;
+	}
+
+	/**
+	 * Returns the name of this download adapter in use
+	 *
+	 * @return  string
+	 */
+	public function getName()
+	{
+		return $this->name;
+	}
+
+	/**
+	 * 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    $params  Additional params that will be added before performing the download
+	 *
+	 * @return  string  The raw file data retrieved from the remote URL.
+	 *
+	 * @throws  DownloadError  A generic exception is thrown on error
+	 */
+	public function downloadAndReturn($url, $from = null, $to = null, array $params = [])
+	{
+		return '';
+	}
+
+	/**
+	 * Get the size of a remote file in bytes
+	 *
+	 * @param   string  $url  The remote file's URL
+	 *
+	 * @return  integer  The file size, or -1 if the remote server doesn't support this feature
+	 */
+	public function getFileSize($url)
+	{
+		return -1;
+	}
+}