Add support for the OAuth2 "Implicit" grant flow.

Author: Potherca

src/Factory/ConfigFactory.php

@@ -47,6 +47,7 @@ final public function create() : Config
         $grantTypes = [
             GrantType::AUTH_CODE,
             GrantType::CLIENT_CREDENTIALS,
+            GrantType::IMPLICIT,
             GrantType::REFRESH_TOKEN,
         ];
 

src/Factory/GrantTypeFactory.php

@@ -8,6 +8,7 @@
 use League\OAuth2\Server\Grant\AuthCodeGrant;
 use League\OAuth2\Server\Grant\ClientCredentialsGrant;
 use League\OAuth2\Server\Grant\GrantTypeInterface;
+use League\OAuth2\Server\Grant\ImplicitGrant;
 use League\OAuth2\Server\Grant\RefreshTokenGrant;
 use Pdsinterop\Solid\Auth\Config\Expiration;
 use Pdsinterop\Solid\Auth\Enum\OAuth2\GrantType;
@@ -52,6 +53,10 @@ final public function createGrantType(string $grantType) : GrantTypeInterface
                 $grant = $this->createClientCredentialsGrant();
                 break;
 
+            case GrantType::IMPLICIT:
+                $grant = $this->createImplicitGrant($expiration->forAccessToken());
+                break;
+
             case GrantType::REFRESH_TOKEN:
                 $grant = $this->createRefreshTokenGrant($factory);
                 break;
@@ -88,6 +93,11 @@ private function createAuthCodeGrant(RepositoryFactory $factory, DateInterval $e
         );
     }
 
+    private function createImplicitGrant(DateInterval $expiration) : ImplicitGrant
+    {
+        return new ImplicitGrant($expiration);
+    }
+
     private function createRefreshTokenGrant(RepositoryFactory $factory) : RefreshTokenGrant
     {
         return new RefreshTokenGrant(