124 lines
4.5 KiB
PHP
124 lines
4.5 KiB
PHP
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<?php
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/* vim: set expandtab tabstop=4 shiftwidth=4: */
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// +----------------------------------------------------------------------+
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// | PHP version 4 |
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// +----------------------------------------------------------------------+
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// | Copyright (c) 1997-2003 The PHP Group |
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// +----------------------------------------------------------------------+
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// | This source file is subject to version 2.0 of the PHP license, |
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// | that is bundled with this package in the file LICENSE, and is |
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// | available through the world-wide-web at |
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// | http://www.php.net/license/2_02.txt. |
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// | If you did not receive a copy of the PHP license and are unable to |
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// | obtain it through the world-wide-web, please send a note to |
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// | license@php.net so we can mail you a copy immediately. |
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// +----------------------------------------------------------------------+
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// | Author: Marshall Roch <marshall@exclupen.com> |
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// +----------------------------------------------------------------------+
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//
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// $Id: Common.php,v 1.1.1.1 2003/09/13 15:03:53 mroch Exp $
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/**
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* @author Marshall Roch <marshall@exclupen.com>
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* @copyright Copyright 2003 Marshall Roch
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* @license http://www.php.net/license/2_02.txt PHP License 2.0
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* @package Services_ExchangeRates
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*/
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/**
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* Cache_Lite is needed to cache the feeds
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*/
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if ( !class_exists('Cache_Lite') ) {
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require_once 'Cache/Lite.php';
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}
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/**
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* Common functions for data retrieval
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*
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* Provides base functions to retrieve and cache data feeds in different
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* formats.
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*
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* @package Services_ExchangeRates
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*/
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class Services_ExchangeRates_Common {
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/**
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* Retrieves data from cache, if it's there. If it is, but it's expired,
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* it performs a conditional GET to see if the data is updated. If it
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* isn't, it down updates the modification time of the cache file and
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* returns the data. If the cache is not there, or the remote file has been
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* modified, it is downloaded and cached.
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*
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* @param string URL of remote file to retrieve
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* @param int Length of time to cache file locally before asking the server
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* if it changed.
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* @return string File contents
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*/
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function retrieveFile($url, $cacheLength, $cacheDir) {
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$cacheID = md5($url);
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$cache = new Cache_Lite(array("cacheDir" => $cacheDir,
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"lifeTime" => $cacheLength));
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if ($data = $cache->get($cacheID)) {
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return $data;
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} else {
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// we need to perform a request, so include HTTP_Request
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include_once 'HTTP/Request.php';
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// HTTP_Request has moronic redirect "handling", turn that off (Alexey Borzov)
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$req = new HTTP_Request($url, array('allowRedirects' => false));
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// if $cache->get($cacheID) found the file, but it was expired,
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// $cache->_file will exist
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if (isset($cache->_file) && file_exists($cache->_file)) {
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$req->addHeader('If-Modified-Since', gmdate("D, d M Y H:i:s", filemtime($cache->_file)) ." GMT");
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}
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$req->addHeader('User-Agent', 'Firefox (WindowsXP) – Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.8.1.6) Gecko/20070725 Firefox/2.0.0.6');
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$req->sendRequest();
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if (!($req->getResponseCode() == 304)) {
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// data is changed, so save it to cache
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$data = $req->getResponseBody();
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$cache->save($data, $cacheID);
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return $data;
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} else {
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// retrieve the data, since the first time we did this failed
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if ($data = $cache->get($cacheID, 'default', true)) {
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return $data;
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}
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}
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}
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Services_ExchangeRates::raiseError("Unable to retrieve file ${url} (unknown reason)", SERVICES_EXCHANGERATES_ERROR_RETRIEVAL_FAILED);
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return false;
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}
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/**
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* Downloads XML file or returns it from cache
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*
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* @param string URL of XML file
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* @param int Length of time to cache
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* @return object XML_Tree object
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*/
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function retrieveXML($url, $cacheLength, $cacheDir) {
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include_once 'XML/Tree.php';
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if ($data = $this->retrieveFile($url, $cacheLength, $cacheDir)) {
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$tree = new XML_Tree();
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$root = $tree->getTreeFromString($data);
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return $root;
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}
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return false;
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}
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}
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?>
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