UsernameResolver.php

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<?php
 
declare(strict_types=1);
 
namespace ILIAS\ApacheAuth\UsernameProvider;
 
use Psr\Http\Message\ServerRequestInterface;
 
final class UsernameResolver
{
    private array $providers;
 
    public function __construct(array $providers, private readonly \ilLogger $logger)
    {
        if (!array_is_list($providers)) {
            throw new \InvalidArgumentException('Providers must be passed as list');
        }
 
        $this->providers = $providers;
 
        // Sort by descending priority, this also ensures the expected type of the elements
        usort(
            $this->providers,
            static fn(UsernameProvider $a, UsernameProvider $b): int => $b->getPriority() <=> $a->getPriority()
        );
    }
 
    public function resolve(ServerRequestInterface $request): UsernameInterface
    {
        foreach ($this->providers as $provider) {
            $this->logger->debug('Trying to resolve username using provider {provider} with prio {priority}', [
                'provider' => $provider::class,
                'priority' => $provider->getPriority(),
            ]);
 
            $username = $provider->getUsername($request);
 
            if (!$username->isEmpty()) {
                $this->logger->debug('Username resolved to {username} by provider {provider}', [
                    'username' => $username->asString(),
                    'provider' => $provider::class,
                ]);
 
                return $username;
            }
 
            $this->logger->debug('Provider {provider} could not resolve a username', [
                'provider' => $provider::class,
            ]);
        }
 
        $this->logger->debug('No username could be resolved by any provider, returning NullUsername');
 
        return new NullUsername();
    }
}