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<?php
/**
* Elgg RewriteTester.
* Test if URL rewriting is working.
*
* @package Elgg
* @subpackage Installer
*/
class ElggRewriteTester {
protected $webserver;
protected $serverSupportsRemoteRead;
protected $rewriteTestPassed;
protected $htaccessIssue;
public function __construct() {
$this->webserver = 'unknown';
}
/**
* Run the rewrite test and return a status array
*
* @param string $url URL of rewrite test
* @param string $path Root directory of Elgg with trailing slash
* @return array
*/
public function run($url, $path) {
$this->guessWebServer();
$this->rewriteTestPassed = $this->runRewriteTest($url);
if ($this->rewriteTestPassed == FALSE) {
if ($this->webserver == 'apache' || $this->webserver == 'unknown') {
if ($this->createHtaccess($path)) {
$this->rewriteTestPassed = $this->runRewriteTest($url);
}
}
}
return $this->returnStatus($url);
}
/**
* Guess the web server from $_SERVER['SERVER_SOFTWARE']
*/
protected function guessWebServer() {
$serverString = strtolower($_SERVER['SERVER_SOFTWARE']);
$possibleServers = array('apache', 'nginx', 'lighttpd', 'iis');
foreach ($possibleServers as $server) {
if (strpos($serverString, $server) !== FALSE) {
$this->webserver = $server;
return;
}
}
}
/**
* Hit the rewrite test URL to determine if the rewrite rules are working
*
* @param string $url Rewrite test URL
* @return bool
*/
protected function runRewriteTest($url) {
$this->serverSupportsRemoteRead = TRUE;
if (function_exists('curl_init')) {
// try curl if installed
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_TIMEOUT, 10);
$response = curl_exec($ch);
curl_close($ch);
return $response === 'success';
} else if (ini_get('allow_url_fopen')) {
// use file_get_contents as fallback
$response = file_get_contents($url);
return $response === 'success';
} else {
$this->serverSupportsRemoteRead = FALSE;
return FALSE;
}
}
/**
* Create Elgg's .htaccess file or confirm that it exists
*
* @param string $path Elgg's root directory with trailing slash
* @return bool
*/
protected function createHtaccess($path) {
$filename = "{$path}.htaccess";
if (file_exists($filename)) {
// check that this is the Elgg .htaccess
$data = file_get_contents($filename);
if ($data === FALSE) {
// don't have permission to read the file
$this->htaccessIssue = 'read_permission';
return FALSE;
}
if (strpos($data, 'Elgg') === FALSE) {
$this->htaccessIssue = 'non_elgg_htaccess';
return FALSE;
} else {
return TRUE;
}
}
if (!is_writable($path)) {
$this->htaccessIssue = 'write_permission';
return FALSE;
}
// create the .htaccess file
$result = copy("{$path}htaccess_dist", $filename);
if (!$result) {
$this->htaccessIssue = 'cannot_copy';
return FALSE;
}
return TRUE;
}
/**
* Create the status array required by the ElggInstaller
*
* @param string $url Rewrite test URL
* @return array
*/
protected function returnStatus($url) {
if ($this->rewriteTestPassed) {
return array(
'severity' => 'pass',
'message' => elgg_echo('install:check:rewrite:success'),
);
}
if ($this->serverSupportsRemoteRead == FALSE) {
$msg = sprintf(elgg_echo('install:warning:rewrite:unknown'), $url);
return array(
'severity' => 'warning',
'message' => $msg,
);
}
if ($this->webserver == 'apache') {
$serverString = elgg_echo('install:error:rewrite:apache');
$msg = "$serverString\n\n";
if (!isset($this->htaccessIssue)) {
$msg .= elgg_echo('install:error:rewrite:allowoverride');
return array(
'severity' => 'failure',
'message' => $msg,
);
}
$msg .= elgg_echo("install:error:rewrite:htaccess:{$this->htaccessIssue}");
return array(
'severity' => 'failure',
'message' => $msg,
);
}
if ($this->webserver != 'unknown') {
$serverString = elgg_echo("install:error:rewrite:{$this->webserver}");
$msg = "$serverString\n\n";
$msg .= elgg_echo("install:error:rewrite:altserver");
return array(
'severity' => 'failure',
'message' => $msg,
);
}
return array(
'severity' => 'failure',
'message' => elgg_echo('install:error:rewrite:unknown'),
);
}
}
|
