[5146] | 1 | <?php |
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| 2 | /** |
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| 3 | * PEAR_REST |
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| 4 | * |
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| 5 | * PHP versions 4 and 5 |
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| 6 | * |
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| 7 | * @category pear |
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| 8 | * @package PEAR |
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| 9 | * @author Greg Beaver <cellog@php.net> |
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| 10 | * @copyright 1997-2009 The Authors |
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| 11 | * @license http://opensource.org/licenses/bsd-license.php New BSD License |
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| 12 | * @version CVS: $Id: REST.php 313023 2011-07-06 19:17:11Z dufuz $ |
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| 13 | * @link http://pear.php.net/package/PEAR |
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| 14 | * @since File available since Release 1.4.0a1 |
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| 15 | */ |
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| 16 | |
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| 17 | /** |
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| 18 | * For downloading xml files |
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| 19 | */ |
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| 20 | require_once 'PEAR.php'; |
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| 21 | require_once 'PEAR/XMLParser.php'; |
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| 22 | |
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| 23 | /** |
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| 24 | * Intelligently retrieve data, following hyperlinks if necessary, and re-directing |
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| 25 | * as well |
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| 26 | * @category pear |
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| 27 | * @package PEAR |
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| 28 | * @author Greg Beaver <cellog@php.net> |
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| 29 | * @copyright 1997-2009 The Authors |
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| 30 | * @license http://opensource.org/licenses/bsd-license.php New BSD License |
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| 31 | * @version Release: 1.9.4 |
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| 32 | * @link http://pear.php.net/package/PEAR |
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| 33 | * @since Class available since Release 1.4.0a1 |
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| 34 | */ |
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| 35 | class PEAR_REST |
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| 36 | { |
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| 37 | var $config; |
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| 38 | var $_options; |
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| 39 | |
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| 40 | function PEAR_REST(&$config, $options = array()) |
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| 41 | { |
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| 42 | $this->config = &$config; |
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| 43 | $this->_options = $options; |
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| 44 | } |
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| 45 | |
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| 46 | /** |
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| 47 | * Retrieve REST data, but always retrieve the local cache if it is available. |
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| 48 | * |
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| 49 | * This is useful for elements that should never change, such as information on a particular |
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| 50 | * release |
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| 51 | * @param string full URL to this resource |
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| 52 | * @param array|false contents of the accept-encoding header |
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| 53 | * @param boolean if true, xml will be returned as a string, otherwise, xml will be |
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| 54 | * parsed using PEAR_XMLParser |
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| 55 | * @return string|array |
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| 56 | */ |
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| 57 | function retrieveCacheFirst($url, $accept = false, $forcestring = false, $channel = false) |
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| 58 | { |
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| 59 | $cachefile = $this->config->get('cache_dir') . DIRECTORY_SEPARATOR . |
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| 60 | md5($url) . 'rest.cachefile'; |
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| 61 | |
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| 62 | if (file_exists($cachefile)) { |
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| 63 | return unserialize(implode('', file($cachefile))); |
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| 64 | } |
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| 65 | |
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| 66 | return $this->retrieveData($url, $accept, $forcestring, $channel); |
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| 67 | } |
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| 68 | |
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| 69 | /** |
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| 70 | * Retrieve a remote REST resource |
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| 71 | * @param string full URL to this resource |
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| 72 | * @param array|false contents of the accept-encoding header |
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| 73 | * @param boolean if true, xml will be returned as a string, otherwise, xml will be |
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| 74 | * parsed using PEAR_XMLParser |
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| 75 | * @return string|array |
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| 76 | */ |
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| 77 | function retrieveData($url, $accept = false, $forcestring = false, $channel = false) |
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| 78 | { |
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| 79 | $cacheId = $this->getCacheId($url); |
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| 80 | if ($ret = $this->useLocalCache($url, $cacheId)) { |
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| 81 | return $ret; |
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| 82 | } |
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| 83 | |
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| 84 | $file = $trieddownload = false; |
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| 85 | if (!isset($this->_options['offline'])) { |
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| 86 | $trieddownload = true; |
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| 87 | $file = $this->downloadHttp($url, $cacheId ? $cacheId['lastChange'] : false, $accept, $channel); |
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| 88 | } |
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| 89 | |
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| 90 | if (PEAR::isError($file)) { |
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| 91 | if ($file->getCode() !== -9276) { |
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| 92 | return $file; |
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| 93 | } |
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| 94 | |
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| 95 | $trieddownload = false; |
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| 96 | $file = false; // use local copy if available on socket connect error |
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| 97 | } |
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| 98 | |
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| 99 | if (!$file) { |
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| 100 | $ret = $this->getCache($url); |
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| 101 | if (!PEAR::isError($ret) && $trieddownload) { |
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| 102 | // reset the age of the cache if the server says it was unmodified |
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| 103 | $result = $this->saveCache($url, $ret, null, true, $cacheId); |
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| 104 | if (PEAR::isError($result)) { |
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| 105 | return PEAR::raiseError($result->getMessage()); |
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| 106 | } |
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| 107 | } |
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| 108 | |
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| 109 | return $ret; |
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| 110 | } |
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| 111 | |
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| 112 | if (is_array($file)) { |
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| 113 | $headers = $file[2]; |
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| 114 | $lastmodified = $file[1]; |
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| 115 | $content = $file[0]; |
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| 116 | } else { |
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| 117 | $headers = array(); |
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| 118 | $lastmodified = false; |
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| 119 | $content = $file; |
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| 120 | } |
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| 121 | |
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| 122 | if ($forcestring) { |
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| 123 | $result = $this->saveCache($url, $content, $lastmodified, false, $cacheId); |
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| 124 | if (PEAR::isError($result)) { |
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| 125 | return PEAR::raiseError($result->getMessage()); |
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| 126 | } |
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| 127 | |
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| 128 | return $content; |
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| 129 | } |
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| 130 | |
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| 131 | if (isset($headers['content-type'])) { |
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| 132 | switch ($headers['content-type']) { |
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| 133 | case 'text/xml' : |
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| 134 | case 'application/xml' : |
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| 135 | case 'text/plain' : |
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| 136 | if ($headers['content-type'] === 'text/plain') { |
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| 137 | $check = substr($content, 0, 5); |
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| 138 | if ($check !== '<?xml') { |
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| 139 | break; |
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| 140 | } |
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| 141 | } |
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| 142 | |
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| 143 | $parser = new PEAR_XMLParser; |
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| 144 | PEAR::pushErrorHandling(PEAR_ERROR_RETURN); |
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| 145 | $err = $parser->parse($content); |
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| 146 | PEAR::popErrorHandling(); |
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| 147 | if (PEAR::isError($err)) { |
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| 148 | return PEAR::raiseError('Invalid xml downloaded from "' . $url . '": ' . |
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| 149 | $err->getMessage()); |
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| 150 | } |
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| 151 | $content = $parser->getData(); |
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| 152 | case 'text/html' : |
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| 153 | default : |
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| 154 | // use it as a string |
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| 155 | } |
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| 156 | } else { |
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| 157 | // assume XML |
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| 158 | $parser = new PEAR_XMLParser; |
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| 159 | $parser->parse($content); |
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| 160 | $content = $parser->getData(); |
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| 161 | } |
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| 162 | |
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| 163 | $result = $this->saveCache($url, $content, $lastmodified, false, $cacheId); |
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| 164 | if (PEAR::isError($result)) { |
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| 165 | return PEAR::raiseError($result->getMessage()); |
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| 166 | } |
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| 167 | |
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| 168 | return $content; |
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| 169 | } |
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| 170 | |
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| 171 | function useLocalCache($url, $cacheid = null) |
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| 172 | { |
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| 173 | if ($cacheid === null) { |
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| 174 | $cacheidfile = $this->config->get('cache_dir') . DIRECTORY_SEPARATOR . |
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| 175 | md5($url) . 'rest.cacheid'; |
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| 176 | if (!file_exists($cacheidfile)) { |
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| 177 | return false; |
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| 178 | } |
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| 179 | |
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| 180 | $cacheid = unserialize(implode('', file($cacheidfile))); |
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| 181 | } |
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| 182 | |
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| 183 | $cachettl = $this->config->get('cache_ttl'); |
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| 184 | // If cache is newer than $cachettl seconds, we use the cache! |
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| 185 | if (time() - $cacheid['age'] < $cachettl) { |
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| 186 | return $this->getCache($url); |
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| 187 | } |
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| 188 | |
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| 189 | return false; |
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| 190 | } |
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| 191 | |
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| 192 | function getCacheId($url) |
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| 193 | { |
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| 194 | $cacheidfile = $this->config->get('cache_dir') . DIRECTORY_SEPARATOR . |
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| 195 | md5($url) . 'rest.cacheid'; |
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| 196 | |
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| 197 | if (!file_exists($cacheidfile)) { |
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| 198 | return false; |
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| 199 | } |
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| 200 | |
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| 201 | $ret = unserialize(implode('', file($cacheidfile))); |
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| 202 | return $ret; |
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| 203 | } |
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| 204 | |
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| 205 | function getCache($url) |
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| 206 | { |
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| 207 | $cachefile = $this->config->get('cache_dir') . DIRECTORY_SEPARATOR . |
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| 208 | md5($url) . 'rest.cachefile'; |
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| 209 | |
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| 210 | if (!file_exists($cachefile)) { |
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| 211 | return PEAR::raiseError('No cached content available for "' . $url . '"'); |
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| 212 | } |
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| 213 | |
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| 214 | return unserialize(implode('', file($cachefile))); |
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| 215 | } |
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| 216 | |
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| 217 | /** |
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| 218 | * @param string full URL to REST resource |
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| 219 | * @param string original contents of the REST resource |
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| 220 | * @param array HTTP Last-Modified and ETag headers |
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| 221 | * @param bool if true, then the cache id file should be regenerated to |
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| 222 | * trigger a new time-to-live value |
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| 223 | */ |
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| 224 | function saveCache($url, $contents, $lastmodified, $nochange = false, $cacheid = null) |
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| 225 | { |
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| 226 | $cache_dir = $this->config->get('cache_dir'); |
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| 227 | $d = $cache_dir . DIRECTORY_SEPARATOR . md5($url); |
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| 228 | $cacheidfile = $d . 'rest.cacheid'; |
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| 229 | $cachefile = $d . 'rest.cachefile'; |
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| 230 | |
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| 231 | if (!is_dir($cache_dir)) { |
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| 232 | if (System::mkdir(array('-p', $cache_dir)) === false) { |
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| 233 | return PEAR::raiseError("The value of config option cache_dir ($cache_dir) is not a directory and attempts to create the directory failed."); |
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| 234 | } |
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| 235 | } |
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| 236 | |
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| 237 | if ($cacheid === null && $nochange) { |
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| 238 | $cacheid = unserialize(implode('', file($cacheidfile))); |
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| 239 | } |
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| 240 | |
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| 241 | $idData = serialize(array( |
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| 242 | 'age' => time(), |
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| 243 | 'lastChange' => ($nochange ? $cacheid['lastChange'] : $lastmodified), |
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| 244 | )); |
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| 245 | |
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| 246 | $result = $this->saveCacheFile($cacheidfile, $idData); |
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| 247 | if (PEAR::isError($result)) { |
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| 248 | return $result; |
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| 249 | } elseif ($nochange) { |
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| 250 | return true; |
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| 251 | } |
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| 252 | |
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| 253 | $result = $this->saveCacheFile($cachefile, serialize($contents)); |
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| 254 | if (PEAR::isError($result)) { |
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| 255 | if (file_exists($cacheidfile)) { |
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| 256 | @unlink($cacheidfile); |
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| 257 | } |
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| 258 | |
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| 259 | return $result; |
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| 260 | } |
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| 261 | |
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| 262 | return true; |
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| 263 | } |
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| 264 | |
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| 265 | function saveCacheFile($file, $contents) |
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| 266 | { |
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| 267 | $len = strlen($contents); |
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| 268 | |
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| 269 | $cachefile_fp = @fopen($file, 'xb'); // x is the O_CREAT|O_EXCL mode |
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| 270 | if ($cachefile_fp !== false) { // create file |
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| 271 | if (fwrite($cachefile_fp, $contents, $len) < $len) { |
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| 272 | fclose($cachefile_fp); |
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| 273 | return PEAR::raiseError("Could not write $file."); |
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| 274 | } |
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| 275 | } else { // update file |
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| 276 | $cachefile_lstat = lstat($file); |
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| 277 | $cachefile_fp = @fopen($file, 'wb'); |
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| 278 | if (!$cachefile_fp) { |
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| 279 | return PEAR::raiseError("Could not open $file for writing."); |
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| 280 | } |
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| 281 | |
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| 282 | $cachefile_fstat = fstat($cachefile_fp); |
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| 283 | if ( |
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| 284 | $cachefile_lstat['mode'] == $cachefile_fstat['mode'] && |
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| 285 | $cachefile_lstat['ino'] == $cachefile_fstat['ino'] && |
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| 286 | $cachefile_lstat['dev'] == $cachefile_fstat['dev'] && |
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| 287 | $cachefile_fstat['nlink'] === 1 |
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| 288 | ) { |
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| 289 | if (fwrite($cachefile_fp, $contents, $len) < $len) { |
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| 290 | fclose($cachefile_fp); |
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| 291 | return PEAR::raiseError("Could not write $file."); |
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| 292 | } |
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| 293 | } else { |
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| 294 | fclose($cachefile_fp); |
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| 295 | $link = function_exists('readlink') ? readlink($file) : $file; |
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| 296 | return PEAR::raiseError('SECURITY ERROR: Will not write to ' . $file . ' as it is symlinked to ' . $link . ' - Possible symlink attack'); |
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| 297 | } |
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| 298 | } |
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| 299 | |
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| 300 | fclose($cachefile_fp); |
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| 301 | return true; |
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| 302 | } |
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| 303 | |
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| 304 | /** |
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| 305 | * Efficiently Download a file through HTTP. Returns downloaded file as a string in-memory |
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| 306 | * This is best used for small files |
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| 307 | * |
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| 308 | * If an HTTP proxy has been configured (http_proxy PEAR_Config |
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| 309 | * setting), the proxy will be used. |
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| 310 | * |
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| 311 | * @param string $url the URL to download |
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| 312 | * @param string $save_dir directory to save file in |
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| 313 | * @param false|string|array $lastmodified header values to check against for caching |
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| 314 | * use false to return the header values from this download |
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| 315 | * @param false|array $accept Accept headers to send |
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| 316 | * @return string|array Returns the contents of the downloaded file or a PEAR |
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| 317 | * error on failure. If the error is caused by |
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| 318 | * socket-related errors, the error object will |
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| 319 | * have the fsockopen error code available through |
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| 320 | * getCode(). If caching is requested, then return the header |
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| 321 | * values. |
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| 322 | * |
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| 323 | * @access public |
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| 324 | */ |
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| 325 | function downloadHttp($url, $lastmodified = null, $accept = false, $channel = false) |
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| 326 | { |
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| 327 | static $redirect = 0; |
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| 328 | // always reset , so we are clean case of error |
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| 329 | $wasredirect = $redirect; |
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| 330 | $redirect = 0; |
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| 331 | |
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| 332 | $info = parse_url($url); |
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| 333 | if (!isset($info['scheme']) || !in_array($info['scheme'], array('http', 'https'))) { |
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| 334 | return PEAR::raiseError('Cannot download non-http URL "' . $url . '"'); |
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| 335 | } |
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| 336 | |
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| 337 | if (!isset($info['host'])) { |
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| 338 | return PEAR::raiseError('Cannot download from non-URL "' . $url . '"'); |
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| 339 | } |
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| 340 | |
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| 341 | $host = isset($info['host']) ? $info['host'] : null; |
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| 342 | $port = isset($info['port']) ? $info['port'] : null; |
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| 343 | $path = isset($info['path']) ? $info['path'] : null; |
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| 344 | $schema = (isset($info['scheme']) && $info['scheme'] == 'https') ? 'https' : 'http'; |
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| 345 | |
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| 346 | $proxy_host = $proxy_port = $proxy_user = $proxy_pass = ''; |
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| 347 | if ($this->config->get('http_proxy')&& |
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| 348 | $proxy = parse_url($this->config->get('http_proxy')) |
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| 349 | ) { |
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| 350 | $proxy_host = isset($proxy['host']) ? $proxy['host'] : null; |
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| 351 | if ($schema === 'https') { |
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| 352 | $proxy_host = 'ssl://' . $proxy_host; |
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| 353 | } |
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| 354 | |
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| 355 | $proxy_port = isset($proxy['port']) ? $proxy['port'] : 8080; |
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| 356 | $proxy_user = isset($proxy['user']) ? urldecode($proxy['user']) : null; |
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| 357 | $proxy_pass = isset($proxy['pass']) ? urldecode($proxy['pass']) : null; |
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| 358 | $proxy_schema = (isset($proxy['scheme']) && $proxy['scheme'] == 'https') ? 'https' : 'http'; |
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| 359 | } |
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| 360 | |
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| 361 | if (empty($port)) { |
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| 362 | $port = (isset($info['scheme']) && $info['scheme'] == 'https') ? 443 : 80; |
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| 363 | } |
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| 364 | |
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| 365 | if (isset($proxy['host'])) { |
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| 366 | $request = "GET $url HTTP/1.1\r\n"; |
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| 367 | } else { |
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| 368 | $request = "GET $path HTTP/1.1\r\n"; |
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| 369 | } |
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| 370 | |
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| 371 | $request .= "Host: $host\r\n"; |
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| 372 | $ifmodifiedsince = ''; |
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| 373 | if (is_array($lastmodified)) { |
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| 374 | if (isset($lastmodified['Last-Modified'])) { |
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| 375 | $ifmodifiedsince = 'If-Modified-Since: ' . $lastmodified['Last-Modified'] . "\r\n"; |
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| 376 | } |
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| 377 | |
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| 378 | if (isset($lastmodified['ETag'])) { |
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| 379 | $ifmodifiedsince .= "If-None-Match: $lastmodified[ETag]\r\n"; |
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| 380 | } |
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| 381 | } else { |
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| 382 | $ifmodifiedsince = ($lastmodified ? "If-Modified-Since: $lastmodified\r\n" : ''); |
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| 383 | } |
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| 384 | |
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| 385 | $request .= $ifmodifiedsince . |
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| 386 | "User-Agent: PEAR/1.9.4/PHP/" . PHP_VERSION . "\r\n"; |
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| 387 | |
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| 388 | $username = $this->config->get('username', null, $channel); |
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| 389 | $password = $this->config->get('password', null, $channel); |
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| 390 | |
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| 391 | if ($username && $password) { |
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| 392 | $tmp = base64_encode("$username:$password"); |
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| 393 | $request .= "Authorization: Basic $tmp\r\n"; |
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| 394 | } |
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| 395 | |
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| 396 | if ($proxy_host != '' && $proxy_user != '') { |
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| 397 | $request .= 'Proxy-Authorization: Basic ' . |
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| 398 | base64_encode($proxy_user . ':' . $proxy_pass) . "\r\n"; |
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| 399 | } |
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| 400 | |
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| 401 | if ($accept) { |
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| 402 | $request .= 'Accept: ' . implode(', ', $accept) . "\r\n"; |
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| 403 | } |
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| 404 | |
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| 405 | $request .= "Accept-Encoding:\r\n"; |
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| 406 | $request .= "Connection: close\r\n"; |
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| 407 | $request .= "\r\n"; |
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| 408 | |
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| 409 | if ($proxy_host != '') { |
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| 410 | $fp = @fsockopen($proxy_host, $proxy_port, $errno, $errstr, 15); |
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| 411 | if (!$fp) { |
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| 412 | return PEAR::raiseError("Connection to `$proxy_host:$proxy_port' failed: $errstr", -9276); |
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| 413 | } |
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| 414 | } else { |
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| 415 | if ($schema === 'https') { |
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| 416 | $host = 'ssl://' . $host; |
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| 417 | } |
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| 418 | |
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| 419 | $fp = @fsockopen($host, $port, $errno, $errstr); |
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| 420 | if (!$fp) { |
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| 421 | return PEAR::raiseError("Connection to `$host:$port' failed: $errstr", $errno); |
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| 422 | } |
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| 423 | } |
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| 424 | |
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| 425 | fwrite($fp, $request); |
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| 426 | |
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| 427 | $headers = array(); |
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| 428 | $reply = 0; |
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| 429 | while ($line = trim(fgets($fp, 1024))) { |
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| 430 | if (preg_match('/^([^:]+):\s+(.*)\s*\\z/', $line, $matches)) { |
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| 431 | $headers[strtolower($matches[1])] = trim($matches[2]); |
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| 432 | } elseif (preg_match('|^HTTP/1.[01] ([0-9]{3}) |', $line, $matches)) { |
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| 433 | $reply = (int)$matches[1]; |
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| 434 | if ($reply == 304 && ($lastmodified || ($lastmodified === false))) { |
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| 435 | return false; |
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| 436 | } |
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| 437 | |
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| 438 | if (!in_array($reply, array(200, 301, 302, 303, 305, 307))) { |
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| 439 | return PEAR::raiseError("File $schema://$host:$port$path not valid (received: $line)"); |
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| 440 | } |
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| 441 | } |
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| 442 | } |
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| 443 | |
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| 444 | if ($reply != 200) { |
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| 445 | if (!isset($headers['location'])) { |
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| 446 | return PEAR::raiseError("File $schema://$host:$port$path not valid (redirected but no location)"); |
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| 447 | } |
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| 448 | |
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| 449 | if ($wasredirect > 4) { |
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| 450 | return PEAR::raiseError("File $schema://$host:$port$path not valid (redirection looped more than 5 times)"); |
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| 451 | } |
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| 452 | |
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| 453 | $redirect = $wasredirect + 1; |
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| 454 | return $this->downloadHttp($headers['location'], $lastmodified, $accept, $channel); |
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| 455 | } |
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| 456 | |
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| 457 | $length = isset($headers['content-length']) ? $headers['content-length'] : -1; |
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| 458 | |
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| 459 | $data = ''; |
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| 460 | while ($chunk = @fread($fp, 8192)) { |
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| 461 | $data .= $chunk; |
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| 462 | } |
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| 463 | fclose($fp); |
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| 464 | |
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| 465 | if ($lastmodified === false || $lastmodified) { |
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| 466 | if (isset($headers['etag'])) { |
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| 467 | $lastmodified = array('ETag' => $headers['etag']); |
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| 468 | } |
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| 469 | |
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| 470 | if (isset($headers['last-modified'])) { |
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| 471 | if (is_array($lastmodified)) { |
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| 472 | $lastmodified['Last-Modified'] = $headers['last-modified']; |
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| 473 | } else { |
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| 474 | $lastmodified = $headers['last-modified']; |
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| 475 | } |
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| 476 | } |
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| 477 | |
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| 478 | return array($data, $lastmodified, $headers); |
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| 479 | } |
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| 480 | |
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| 481 | return $data; |
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| 482 | } |
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| 483 | } |
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