client id can be anything

database/migrations/structure/20230412_0208_oauth_client_id_longer.sql

@@ -0,0 +1,2 @@
+ALTER TABLE `oauth_clients`
+MODIFY `client_id` varchar(255) CHARACTER SET ascii COLLATE ascii_bin NOT NULL;

src/Cli/AddOAuthClientCommand.php

@@ -14,12 +14,13 @@ class AddOAuthClientCommand extends Command
     {
         $this->setName('oauth:add-client')
             ->setDescription('Adding of OAuth client.')
+            ->addArgument('client-id', InputArgument::OPTIONAL, 'Client ID')
             ->addArgument('preapproved', InputArgument::OPTIONAL, 'Preapproved');
     }
 
     public function execute(InputInterface $input, OutputInterface $output): int
     {
-        $clientId = bin2hex(random_bytes(8));
+        $clientId = $input->getArgument('client-id') ? $input->getArgument('client-id') : bin2hex(random_bytes(8));
         $clientSecret = bin2hex(random_bytes(20));
 
         $oAuthClient = new OAuthClient();
@@ -27,7 +28,7 @@ class AddOAuthClientCommand extends Command
         $oAuthClient->setClientSecret($clientSecret);
         $oAuthClient->setCreatedDate(new DateTime());
 
-        if ($input->hasArgument('preapproved') && $input->getArgument('preapproved')) {
+        if ($input->getArgument('preapproved')) {
             $oAuthClient->setPreapproved($input->getArgument('preapproved'));
         }
 

src/Controller/OAuthController.php

@@ -59,6 +59,7 @@ class OAuthController
             'iat' => (int)$token->getCreatedDate()->getTimestamp(),
             'nbf' => (int)$token->getCreatedDate()->getTimestamp(),
             'exp' => (int)$token->getExpiresDate()->getTimestamp(),
+            'aud' => $clientId,
             'nonce' => $token->getNonce()
         ], $this->getUserInfoInternal(
             $this->userRepository->getById($token->getUserId()),