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<?php
declare(strict_types=1);
namespace BrettParson\MiniRoute\Routing;
use BrettParson\MiniRoute\Attribute\Middleware;
use BrettParson\MiniRoute\Attribute\RouteAttribute;
use ReflectionAttribute;
use ReflectionClass;
use ReflectionException;
use ReflectionMethod;
final class RouteLoader
{
/**
* Scan a controller class and compile the routes declared on its public
* methods.
*
* @param class-string $controllerClass
* @return list<RouteDef>
*/
public function load(string $controllerClass): array
{
if (!class_exists($controllerClass)) {
throw new RouteRegistrationException("Controller class not found: {$controllerClass}");
}
try {
$reflector = new ReflectionClass($controllerClass);
} catch (ReflectionException $e) {
throw new RouteRegistrationException("Unable to reflect controller: {$controllerClass}", 0, $e);
}
$classMiddleware = $this->middlewareClasses($reflector->getAttributes(Middleware::class));
$routes = [];
foreach ($reflector->getMethods(ReflectionMethod::IS_PUBLIC) as $method) {
foreach ($this->loadMethod($controllerClass, $method, $classMiddleware) as $route) {
$routes[] = $route;
}
}
return $routes;
}
/**
* @param list<string> $classMiddleware
* @return list<RouteDef>
*/
private function loadMethod(string $controllerClass, ReflectionMethod $method, array $classMiddleware): array
{
$routeAttributes = $method->getAttributes(RouteAttribute::class, ReflectionAttribute::IS_INSTANCEOF);
if ($routeAttributes === []) {
return [];
}
$methodMiddleware = $this->middlewareClasses($method->getAttributes(Middleware::class));
$middleware = array_merge($classMiddleware, $methodMiddleware);
$routes = [];
foreach ($routeAttributes as $attribute) {
/** @var RouteAttribute $route */
$route = $attribute->newInstance();
$routes[] = new RouteDef(
strtoupper($route->method()),
$route->path(),
$controllerClass,
$method->getName(),
$middleware,
);
}
return $routes;
}
/**
* @param list<ReflectionAttribute> $attributes
* @return list<string>
*/
private function middlewareClasses(array $attributes): array
{
$classes = [];
foreach ($attributes as $attribute) {
/** @var Middleware $middleware */
$middleware = $attribute->newInstance();
$classes[] = $middleware->middlewareClass;
}
return $classes;
}
}
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