diff --git a/src/Middleware/ResourceServerMiddleware.php b/src/Middleware/ResourceServerMiddleware.php
index 1b127608..7836a4ce 100644
--- a/src/Middleware/ResourceServerMiddleware.php
+++ b/src/Middleware/ResourceServerMiddleware.php
@@ -3,23 +3,23 @@
 namespace League\OAuth2\Server\Middleware;
 
 use League\OAuth2\Server\Exception\OAuthServerException;
-use League\OAuth2\Server\Server;
+use League\OAuth2\Server\ResourceServer;
 use Psr\Http\Message\ResponseInterface;
 use Psr\Http\Message\ServerRequestInterface;
 
 class ResourceServerMiddleware
 {
     /**
-     * @var \League\OAuth2\Server\Server
+     * @var \League\OAuth2\Server\ResourceServer
      */
     private $server;
 
     /**
      * ResourceServerMiddleware constructor.
      *
-     * @param \League\OAuth2\Server\Server $server
+     * @param \League\OAuth2\Server\ResourceServer $server
      */
-    public function __construct(Server $server)
+    public function __construct(ResourceServer $server)
     {
         $this->server = $server;
     }
diff --git a/src/ResourceServer.php b/src/ResourceServer.php
new file mode 100644
index 00000000..1b12e8de
--- /dev/null
+++ b/src/ResourceServer.php
@@ -0,0 +1,74 @@
+<?php
+
+namespace League\OAuth2\Server;
+
+use League\OAuth2\Server\AuthorizationValidators\AuthorizationValidatorInterface;
+use League\OAuth2\Server\AuthorizationValidators\BearerTokenValidator;
+use League\OAuth2\Server\Repositories\AccessTokenRepositoryInterface;
+use Psr\Http\Message\ServerRequestInterface;
+
+class ResourceServer
+{
+    /**
+     * @var \League\OAuth2\Server\Repositories\AccessTokenRepositoryInterface
+     */
+    private $accessTokenRepository;
+    /**
+     * @var \League\OAuth2\Server\CryptKey|string
+     */
+    private $publicKey;
+    /**
+     * @var \League\OAuth2\Server\AuthorizationValidators\AuthorizationValidatorInterface|null
+     */
+    private $authorizationValidator;
+
+    /**
+     * New server instance.
+     *
+     * @param \League\OAuth2\Server\Repositories\AccessTokenRepositoryInterface                  $accessTokenRepository
+     * @param \League\OAuth2\Server\CryptKey|string                                              $publicKey
+     * @param null|\League\OAuth2\Server\AuthorizationValidators\AuthorizationValidatorInterface $authorizationValidator
+     */
+    public function __construct(
+        AccessTokenRepositoryInterface $accessTokenRepository,
+        $publicKey,
+        AuthorizationValidatorInterface $authorizationValidator = null
+    ) {
+        $this->accessTokenRepository = $accessTokenRepository;
+
+        if (!$publicKey instanceof CryptKey) {
+            $publicKey = new CryptKey($publicKey);
+        }
+        $this->publicKey = $publicKey;
+
+        $this->authorizationValidator = $authorizationValidator;
+    }
+
+    /**
+     * @return \League\OAuth2\Server\AuthorizationValidators\AuthorizationValidatorInterface
+     */
+    protected function getAuthorizationValidator()
+    {
+        if (!$this->authorizationValidator instanceof AuthorizationValidatorInterface) {
+            $this->authorizationValidator = new BearerTokenValidator($this->accessTokenRepository);
+        }
+
+        $this->authorizationValidator->setPublicKey($this->publicKey);
+
+        return $this->authorizationValidator;
+    }
+
+    /**
+     * Determine the access token validity.
+     *
+     * @param \Psr\Http\Message\ServerRequestInterface $request
+     *
+     * @throws \League\OAuth2\Server\Exception\OAuthServerException
+     *
+     * @return \Psr\Http\Message\ServerRequestInterface
+     */
+    public function validateAuthenticatedRequest(ServerRequestInterface $request)
+    {
+        return $this->getAuthorizationValidator()->validateAuthorization($request);
+    }
+}