/**
* @author Chris Smith <*****@*****.**>
* @copyright 2006 Project Minerva Team
* @param string $path The path which we should attempt to resolve.
* @return mixed
*/
function phpbb_own_realpath($path)
{
// Now to perform funky shizzle
// Switch to use UNIX slashes
$path = str_replace(DIRECTORY_SEPARATOR, '/', $path);
$path_prefix = '';
// Determine what sort of path we have
if (is_absolute($path)) {
$absolute = true;
if ($path[0] == '/') {
// Absolute path, *NIX style
$path_prefix = '';
} else {
// Absolute path, Windows style
// Remove the drive letter and colon
$path_prefix = $path[0] . ':';
$path = substr($path, 2);
}
} else {
// Relative Path
// Prepend the current working directory
if (function_exists('getcwd')) {
// This is the best method, hopefully it is enabled!
$path = str_replace(DIRECTORY_SEPARATOR, '/', getcwd()) . '/' . $path;
$absolute = true;
if (preg_match('#^[a-z]:#i', $path)) {
$path_prefix = $path[0] . ':';
$path = substr($path, 2);
} else {
$path_prefix = '';
}
} else {
if (isset($_SERVER['SCRIPT_FILENAME']) && !empty($_SERVER['SCRIPT_FILENAME'])) {
// Warning: If chdir() has been used this will lie!
// Warning: This has some problems sometime (CLI can create them easily)
$path = str_replace(DIRECTORY_SEPARATOR, '/', dirname($_SERVER['SCRIPT_FILENAME'])) . '/' . $path;
$absolute = true;
$path_prefix = '';
} else {
// We have no way of getting the absolute path, just run on using relative ones.
$absolute = false;
$path_prefix = '.';
}
}
}
// Remove any repeated slashes
$path = preg_replace('#/{2,}#', '/', $path);
// Remove the slashes from the start and end of the path
$path = trim($path, '/');
// Break the string into little bits for us to nibble on
$bits = explode('/', $path);
// Remove any . in the path, renumber array for the loop below
$bits = array_values(array_diff($bits, array('.')));
// Lets get looping, run over and resolve any .. (up directory)
for ($i = 0, $max = sizeof($bits); $i < $max; $i++) {
// @todo Optimise
if ($bits[$i] == '..') {
if (isset($bits[$i - 1])) {
if ($bits[$i - 1] != '..') {
// We found a .. and we are able to traverse upwards, lets do it!
unset($bits[$i]);
unset($bits[$i - 1]);
$i -= 2;
$max -= 2;
$bits = array_values($bits);
}
} else {
if ($absolute) {
// We have an absolute path trying to descend above the root of the filesystem
// ... Error!
return false;
}
}
}
}
// Prepend the path prefix
array_unshift($bits, $path_prefix);
$resolved = '';
$max = sizeof($bits) - 1;
// Check if we are able to resolve symlinks, Windows cannot.
$symlink_resolve = function_exists('readlink') ? true : false;
foreach ($bits as $i => $bit) {
if (@is_dir("{$resolved}/{$bit}") || $i == $max && @is_file("{$resolved}/{$bit}")) {
// Path Exists
if ($symlink_resolve && is_link("{$resolved}/{$bit}") && ($link = readlink("{$resolved}/{$bit}"))) {
// Resolved a symlink.
$resolved = $link . ($i == $max ? '' : '/');
continue;
}
} else {
// Something doesn't exist here!
// This is correct realpath() behaviour but sadly open_basedir and safe_mode make this problematic
// return false;
}
$resolved .= $bit . ($i == $max ? '' : '/');
}
// @todo If the file exists fine and open_basedir only has one path we should be able to prepend it
// because we must be inside that basedir, the question is where...
// @internal The slash in is_dir() gets around an open_basedir restriction
if (!@file_exists($resolved) || !is_dir($resolved . '/') && !is_file($resolved)) {
return false;
}
// Put the slashes back to the native operating systems slashes
$resolved = str_replace('/', DIRECTORY_SEPARATOR, $resolved);
// Check for DIRECTORY_SEPARATOR at the end (and remove it!)
if (substr($resolved, -1) == DIRECTORY_SEPARATOR) {
return substr($resolved, 0, -1);
}
return $resolved;
// We got here, in the end!
}
/**
* @dataProvider is_absolute_data
*/
public function test_is_absolute($path, $expected)
{
$this->assertEquals($expected, is_absolute($path));
}
