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<?php
final class BridgeFactory
{
private $folder;
private $bridgeNames = [];
private $whitelist = [];
public function __construct(string $folder = PATH_LIB_BRIDGES)
{
$this->folder = $folder;
// create names
foreach (scandir($this->folder) as $file) {
if (preg_match('/^([^.]+)Bridge\.php$/U', $file, $m)) {
$this->bridgeNames[] = $m[1];
}
}
// create whitelist
if (file_exists(WHITELIST)) {
$contents = trim(file_get_contents(WHITELIST));
} elseif (file_exists(WHITELIST_DEFAULT)) {
$contents = trim(file_get_contents(WHITELIST_DEFAULT));
} else {
$contents = '';
}
if ($contents === '*') { // Whitelist all bridges
$this->whitelist = $this->getBridgeNames();
} else {
foreach (explode("\n", $contents) as $bridgeName) {
$this->whitelist[] = $this->sanitizeBridgeName($bridgeName);
}
}
}
public function create(string $name): BridgeInterface
{
if (preg_match('/^[A-Z][a-zA-Z0-9-]*$/', $name)) {
$className = sprintf('%sBridge', $this->sanitizeBridgeName($name));
return new $className();
}
throw new \InvalidArgumentException('Bridge name invalid!');
}
public function getBridgeNames(): array
{
return $this->bridgeNames;
}
public function isWhitelisted($name): bool
{
return in_array($this->sanitizeBridgeName($name), $this->whitelist);
}
private function sanitizeBridgeName($name)
{
if (!is_string($name)) {
return null;
}
// Trim trailing '.php' if exists
if (preg_match('/(.+)(?:\.php)/', $name, $matches)) {
$name = $matches[1];
}
// Trim trailing 'Bridge' if exists
if (preg_match('/(.+)(?:Bridge)/i', $name, $matches)) {
$name = $matches[1];
}
// Improve performance for correctly written bridge names
if (in_array($name, $this->getBridgeNames())) {
$index = array_search($name, $this->getBridgeNames());
return $this->getBridgeNames()[$index];
}
// The name is valid if a corresponding bridge file is found on disk
if (in_array(strtolower($name), array_map('strtolower', $this->getBridgeNames()))) {
$index = array_search(strtolower($name), array_map('strtolower', $this->getBridgeNames()));
return $this->getBridgeNames()[$index];
}
Debug::log('Invalid bridge name specified: "' . $name . '"!');
return null;
}
}
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