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REST.php
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REST.php
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<?php
/**
* PEAR_REST
*
* PHP versions 4 and 5
*
* @category pear
* @package PEAR
* @author Greg Beaver <cellog@php.net>
* @copyright 1997-2009 The Authors
* @license http://opensource.org/licenses/bsd-license.php New BSD License
* @link http://pear.php.net/package/PEAR
* @since File available since Release 1.4.0a1
*/
/**
* For downloading xml files
*/
require_once 'PEAR.php';
require_once 'PEAR/XMLParser.php';
require_once 'PEAR/Proxy.php';
/**
* Intelligently retrieve data, following hyperlinks if necessary, and re-directing
* as well
* @category pear
* @package PEAR
* @author Greg Beaver <cellog@php.net>
* @copyright 1997-2009 The Authors
* @license http://opensource.org/licenses/bsd-license.php New BSD License
* @version Release: @package_version@
* @link http://pear.php.net/package/PEAR
* @since Class available since Release 1.4.0a1
*/
class PEAR_REST
{
var $config;
var $_options;
function __construct(&$config, $options = array())
{
$this->config = &$config;
$this->_options = $options;
}
/**
* Retrieve REST data, but always retrieve the local cache if it is available.
*
* This is useful for elements that should never change, such as information on a particular
* release
* @param string full URL to this resource
* @param array|false contents of the accept-encoding header
* @param boolean if true, xml will be returned as a string, otherwise, xml will be
* parsed using PEAR_XMLParser
* @return string|array
*/
function retrieveCacheFirst($url, $accept = false, $forcestring = false, $channel = false)
{
$cachefile = $this->config->get('cache_dir') . DIRECTORY_SEPARATOR .
md5($url) . 'rest.cachefile';
if (file_exists($cachefile)) {
return unserialize(implode('', file($cachefile)));
}
return $this->retrieveData($url, $accept, $forcestring, $channel);
}
/**
* Retrieve a remote REST resource
* @param string full URL to this resource
* @param array|false contents of the accept-encoding header
* @param boolean if true, xml will be returned as a string, otherwise, xml will be
* parsed using PEAR_XMLParser
* @return string|array
*/
function retrieveData($url, $accept = false, $forcestring = false, $channel = false)
{
$cacheId = $this->getCacheId($url);
if ($ret = $this->useLocalCache($url, $cacheId)) {
return $ret;
}
$file = $trieddownload = false;
if (!isset($this->_options['offline'])) {
$trieddownload = true;
$file = $this->downloadHttp($url, $cacheId ? $cacheId['lastChange'] : false, $accept, $channel);
}
if (PEAR::isError($file)) {
if ($file->getCode() !== -9276) {
return $file;
}
$trieddownload = false;
$file = false; // use local copy if available on socket connect error
}
if (!$file) {
$ret = $this->getCache($url);
if (!PEAR::isError($ret) && $trieddownload) {
// reset the age of the cache if the server says it was unmodified
$result = $this->saveCache($url, $ret, null, true, $cacheId);
if (PEAR::isError($result)) {
return PEAR::raiseError($result->getMessage());
}
}
return $ret;
}
if (is_array($file)) {
$headers = $file[2];
$lastmodified = $file[1];
$content = $file[0];
} else {
$headers = array();
$lastmodified = false;
$content = $file;
}
if ($forcestring) {
$result = $this->saveCache($url, $content, $lastmodified, false, $cacheId);
if (PEAR::isError($result)) {
return PEAR::raiseError($result->getMessage());
}
return $content;
}
if (isset($headers['content-type'])) {
$content_type = explode(";", $headers['content-type']);
$content_type = $content_type[0];
switch ($content_type) {
case 'text/xml' :
case 'application/xml' :
case 'text/plain' :
if ($content_type === 'text/plain') {
$check = substr($content, 0, 5);
if ($check !== '<?xml') {
break;
}
}
$parser = new PEAR_XMLParser;
PEAR::pushErrorHandling(PEAR_ERROR_RETURN);
$err = $parser->parse($content);
PEAR::popErrorHandling();
if (PEAR::isError($err)) {
return PEAR::raiseError('Invalid xml downloaded from "' . $url . '": ' .
$err->getMessage());
}
$content = $parser->getData();
case 'text/html' :
default :
// use it as a string
}
} else {
// assume XML
$parser = new PEAR_XMLParser;
$parser->parse($content);
$content = $parser->getData();
}
$result = $this->saveCache($url, $content, $lastmodified, false, $cacheId);
if (PEAR::isError($result)) {
return PEAR::raiseError($result->getMessage());
}
return $content;
}
function useLocalCache($url, $cacheid = null)
{
if (!is_array($cacheid)) {
$cacheid = $this->getCacheId($url);
}
$cachettl = $this->config->get('cache_ttl');
// If cache is newer than $cachettl seconds, we use the cache!
if (is_array($cacheid) && time() - $cacheid['age'] < $cachettl) {
return $this->getCache($url);
}
return false;
}
/**
* @param string $url
*
* @return bool|mixed
*/
function getCacheId($url)
{
$cacheidfile = $this->config->get('cache_dir') . DIRECTORY_SEPARATOR .
md5($url) . 'rest.cacheid';
if (!file_exists($cacheidfile)) {
return false;
}
$ret = unserialize(implode('', file($cacheidfile)));
return $ret;
}
function getCache($url)
{
$cachefile = $this->config->get('cache_dir') . DIRECTORY_SEPARATOR .
md5($url) . 'rest.cachefile';
if (!file_exists($cachefile)) {
return PEAR::raiseError('No cached content available for "' . $url . '"');
}
return unserialize(implode('', file($cachefile)));
}
/**
* @param string full URL to REST resource
* @param string original contents of the REST resource
* @param array HTTP Last-Modified and ETag headers
* @param bool if true, then the cache id file should be regenerated to
* trigger a new time-to-live value
*/
function saveCache($url, $contents, $lastmodified, $nochange = false, $cacheid = null)
{
$cache_dir = $this->config->get('cache_dir');
$d = $cache_dir . DIRECTORY_SEPARATOR . md5($url);
$cacheidfile = $d . 'rest.cacheid';
$cachefile = $d . 'rest.cachefile';
if (!is_dir($cache_dir)) {
if (System::mkdir(array('-p', $cache_dir)) === false) {
return PEAR::raiseError("The value of config option cache_dir ($cache_dir) is not a directory and attempts to create the directory failed.");
}
}
if (!is_writeable($cache_dir)) {
// If writing to the cache dir is not going to work, silently do nothing.
// An ugly hack, but retains compat with PEAR 1.9.1 where many commands
// work fine as non-root user (w/out write access to default cache dir).
return true;
}
if ($cacheid === null && $nochange) {
$cacheid = unserialize(implode('', file($cacheidfile)));
}
$idData = serialize(array(
'age' => time(),
'lastChange' => ($nochange ? $cacheid['lastChange'] : $lastmodified),
));
$result = $this->saveCacheFile($cacheidfile, $idData);
if (PEAR::isError($result)) {
return $result;
} elseif ($nochange) {
return true;
}
$result = $this->saveCacheFile($cachefile, serialize($contents));
if (PEAR::isError($result)) {
if (file_exists($cacheidfile)) {
@unlink($cacheidfile);
}
return $result;
}
return true;
}
function saveCacheFile($file, $contents)
{
$len = strlen($contents);
$cachefile_fp = @fopen($file, 'xb'); // x is the O_CREAT|O_EXCL mode
if ($cachefile_fp !== false) { // create file
if (fwrite($cachefile_fp, $contents, $len) < $len) {
fclose($cachefile_fp);
return PEAR::raiseError("Could not write $file.");
}
} else { // update file
$cachefile_fp = @fopen($file, 'r+b'); // do not truncate file
if (!$cachefile_fp) {
return PEAR::raiseError("Could not open $file for writing.");
}
if (OS_WINDOWS) {
$not_symlink = !is_link($file); // see bug #18834
} else {
$cachefile_lstat = lstat($file);
$cachefile_fstat = fstat($cachefile_fp);
$not_symlink = $cachefile_lstat['mode'] == $cachefile_fstat['mode']
&& $cachefile_lstat['ino'] == $cachefile_fstat['ino']
&& $cachefile_lstat['dev'] == $cachefile_fstat['dev']
&& $cachefile_fstat['nlink'] === 1;
}
if ($not_symlink) {
ftruncate($cachefile_fp, 0); // NOW truncate
if (fwrite($cachefile_fp, $contents, $len) < $len) {
fclose($cachefile_fp);
return PEAR::raiseError("Could not write $file.");
}
} else {
fclose($cachefile_fp);
$link = function_exists('readlink') ? readlink($file) : $file;
return PEAR::raiseError('SECURITY ERROR: Will not write to ' . $file . ' as it is symlinked to ' . $link . ' - Possible symlink attack');
}
}
fclose($cachefile_fp);
return true;
}
/**
* Efficiently Download a file through HTTP. Returns downloaded file as a string in-memory
* This is best used for small files
*
* If an HTTP proxy has been configured (http_proxy PEAR_Config
* setting), the proxy will be used.
*
* @param string $url the URL to download
* @param string $save_dir directory to save file in
* @param false|string|array $lastmodified header values to check against for caching
* use false to return the header values from this download
* @param false|array $accept Accept headers to send
* @return string|array Returns the contents of the downloaded file or a PEAR
* error on failure. If the error is caused by
* socket-related errors, the error object will
* have the fsockopen error code available through
* getCode(). If caching is requested, then return the header
* values.
*
* @access public
*/
function downloadHttp($url, $lastmodified = null, $accept = false, $channel = false)
{
static $redirect = 0;
// always reset , so we are clean case of error
$wasredirect = $redirect;
$redirect = 0;
$info = parse_url($url);
if (!isset($info['scheme']) || !in_array($info['scheme'], array('http', 'https'))) {
return PEAR::raiseError('Cannot download non-http URL "' . $url . '"');
}
if (!isset($info['host'])) {
return PEAR::raiseError('Cannot download from non-URL "' . $url . '"');
}
$host = isset($info['host']) ? $info['host'] : null;
$port = isset($info['port']) ? $info['port'] : null;
$path = isset($info['path']) ? $info['path'] : null;
$schema = (isset($info['scheme']) && $info['scheme'] == 'https') ? 'https' : 'http';
$proxy = new PEAR_Proxy($this->config);
if (empty($port)) {
$port = (isset($info['scheme']) && $info['scheme'] == 'https') ? 443 : 80;
}
if ($proxy->isProxyConfigured() && $schema === 'http') {
$request = "GET $url HTTP/1.1\r\n";
} else {
$request = "GET $path HTTP/1.1\r\n";
}
$request .= "Host: $host\r\n";
$ifmodifiedsince = '';
if (is_array($lastmodified)) {
if (isset($lastmodified['Last-Modified'])) {
$ifmodifiedsince = 'If-Modified-Since: ' . $lastmodified['Last-Modified'] . "\r\n";
}
if (isset($lastmodified['ETag'])) {
$ifmodifiedsince .= "If-None-Match: $lastmodified[ETag]\r\n";
}
} else {
$ifmodifiedsince = ($lastmodified ? "If-Modified-Since: $lastmodified\r\n" : '');
}
$request .= $ifmodifiedsince .
"User-Agent: PEAR/@package_version@/PHP/" . PHP_VERSION . "\r\n";
$username = $this->config->get('username', null, $channel);
$password = $this->config->get('password', null, $channel);
if ($username && $password) {
$tmp = base64_encode("$username:$password");
$request .= "Authorization: Basic $tmp\r\n";
}
$proxyAuth = $proxy->getProxyAuth();
if ($proxyAuth) {
$request .= 'Proxy-Authorization: Basic ' .
$proxyAuth . "\r\n";
}
if ($accept) {
$request .= 'Accept: ' . implode(', ', $accept) . "\r\n";
}
$request .= "Accept-Encoding:\r\n";
$request .= "Connection: close\r\n";
$request .= "\r\n";
$secure = ($schema == 'https');
$fp = $proxy->openSocket($host, $port, $secure);
if (PEAR::isError($fp)) {
return $fp;
}
fwrite($fp, $request);
$headers = array();
$reply = 0;
while ($line = trim(fgets($fp, 1024))) {
if (preg_match('/^([^:]+):\s+(.*)\s*\\z/', $line, $matches)) {
$headers[strtolower($matches[1])] = trim($matches[2]);
} elseif (preg_match('|^HTTP/1.[01] ([0-9]{3}) |', $line, $matches)) {
$reply = (int)$matches[1];
if ($reply == 304 && ($lastmodified || ($lastmodified === false))) {
return false;
}
if (!in_array($reply, array(200, 301, 302, 303, 305, 307))) {
return PEAR::raiseError("File $schema://$host:$port$path not valid (received: $line)");
}
}
}
if ($reply != 200) {
if (!isset($headers['location'])) {
return PEAR::raiseError("File $schema://$host:$port$path not valid (redirected but no location)");
}
if ($wasredirect > 4) {
return PEAR::raiseError("File $schema://$host:$port$path not valid (redirection looped more than 5 times)");
}
$redirect = $wasredirect + 1;
return $this->downloadHttp($headers['location'], $lastmodified, $accept, $channel);
}
$length = isset($headers['content-length']) ? $headers['content-length'] : -1;
$data = '';
while ($chunk = @fread($fp, 8192)) {
$data .= $chunk;
}
fclose($fp);
if ($lastmodified === false || $lastmodified) {
if (isset($headers['etag'])) {
$lastmodified = array('ETag' => $headers['etag']);
}
if (isset($headers['last-modified'])) {
if (is_array($lastmodified)) {
$lastmodified['Last-Modified'] = $headers['last-modified'];
} else {
$lastmodified = $headers['last-modified'];
}
}
return array($data, $lastmodified, $headers);
}
return $data;
}
}