Describe the Bug
When trying to use Zitadel Identity server for OIDC login to bookstack, it always fails as it does not expect audience claim to be array. According to standard, aud should usually be array, only in special case, when only one audience is available, it may present it as string. Source: https://datatracker.ietf.org/doc/html/rfc7519#section-4.1.3
It may not be usually presented as an array, but sadly Zitadel always sends aud as an array and there is currently no way to disable that behaviour, though it's kinda expected as they do not break the standard with that implementation.
Stack trace in log:
[2023-11-19 19:30:28] production.ERROR: invalid_grant {"exception":"[object] (League\\OAuth2\\Client\\Provider\\Exception\\IdentityProviderException(code: 400): invalid_grant at /var/www/bookstack/app/Access/Oidc/OidcOAuthProvider.php:104)
[stacktrace]
#0 /var/www/bookstack/vendor/league/oauth2-client/src/Provider/AbstractProvider.php(726): BookStack\\Access\\Oidc\\OidcOAuthProvider->checkResponse()
#1 /var/www/bookstack/vendor/league/oauth2-client/src/Provider/AbstractProvider.php(635): League\\OAuth2\\Client\\Provider\\AbstractProvider->getParsedResponse()
#2 /var/www/bookstack/app/Access/Oidc/OidcService.php(67): League\\OAuth2\\Client\\Provider\\AbstractProvider->getAccessToken()
#3 /var/www/bookstack/app/Access/Controllers/OidcController.php(57): BookStack\\Access\\Oidc\\OidcService->processAuthorizeResponse()
#4 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Routing/Controller.php(54): BookStack\\Access\\Controllers\\OidcController->callback()
#5 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php(43): Illuminate\\Routing\\Controller->callAction()
#6 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Routing/Route.php(259): Illuminate\\Routing\\ControllerDispatcher->dispatch()
#7 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Routing/Route.php(205): Illuminate\\Routing\\Route->runController()
#8 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Routing/Router.php(798): Illuminate\\Routing\\Route->run()
#9 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(141): Illuminate\\Routing\\Router->Illuminate\\Routing\\{closure}()
#10 /var/www/bookstack/app/Http/Middleware/CheckGuard.php(27): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#11 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): BookStack\\Http\\Middleware\\CheckGuard->handle()
#12 /var/www/bookstack/app/Http/Middleware/Localization.php(45): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#13 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): BookStack\\Http\\Middleware\\Localization->handle()
#14 /var/www/bookstack/app/Http/Middleware/RunThemeActions.php(26): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#15 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): BookStack\\Http\\Middleware\\RunThemeActions->handle()
#16 /var/www/bookstack/app/Http/Middleware/CheckEmailConfirmed.php(47): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#17 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): BookStack\\Http\\Middleware\\CheckEmailConfirmed->handle()
#18 /var/www/bookstack/app/Http/Middleware/PreventAuthenticatedResponseCaching.php(21): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#19 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): BookStack\\Http\\Middleware\\PreventAuthenticatedResponseCaching->handle()
#20 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/VerifyCsrfToken.php(78): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#21 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\\Foundation\\Http\\Middleware\\VerifyCsrfToken->handle()
#22 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/View/Middleware/ShareErrorsFromSession.php(49): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#23 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\\View\\Middleware\\ShareErrorsFromSession->handle()
#24 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Session/Middleware/StartSession.php(121): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#25 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Session/Middleware/StartSession.php(64): Illuminate\\Session\\Middleware\\StartSession->handleStatefulRequest()
#26 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\\Session\\Middleware\\StartSession->handle()
#27 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Cookie/Middleware/AddQueuedCookiesToResponse.php(37): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#28 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\\Cookie\\Middleware\\AddQueuedCookiesToResponse->handle()
#29 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Cookie/Middleware/EncryptCookies.php(67): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#30 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\\Cookie\\Middleware\\EncryptCookies->handle()
#31 /var/www/bookstack/app/Http/Middleware/ApplyCspRules.php(33): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#32 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): BookStack\\Http\\Middleware\\ApplyCspRules->handle()
#33 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(116): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#34 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Routing/Router.php(797): Illuminate\\Pipeline\\Pipeline->then()
#35 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Routing/Router.php(776): Illuminate\\Routing\\Router->runRouteWithinStack()
#36 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Routing/Router.php(740): Illuminate\\Routing\\Router->runRoute()
#37 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Routing/Router.php(729): Illuminate\\Routing\\Router->dispatchToRoute()
#38 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(190): Illuminate\\Routing\\Router->dispatch()
#39 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(141): Illuminate\\Foundation\\Http\\Kernel->Illuminate\\Foundation\\Http\\{closure}()
#40 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Http/Middleware/TrustProxies.php(39): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#41 /var/www/bookstack/app/Http/Middleware/TrustProxies.php(41): Illuminate\\Http\\Middleware\\TrustProxies->handle()
#42 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): BookStack\\Http\\Middleware\\TrustProxies->handle()
#43 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/TransformsRequest.php(21): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#44 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/TrimStrings.php(40): Illuminate\\Foundation\\Http\\Middleware\\TransformsRequest->handle()
#45 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\\Foundation\\Http\\Middleware\\TrimStrings->handle()
#46 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/ValidatePostSize.php(27): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#47 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\\Foundation\\Http\\Middleware\\ValidatePostSize->handle()
#48 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/PreventRequestsDuringMaintenance.php(86): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#49 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\\Foundation\\Http\\Middleware\\PreventRequestsDuringMaintenance->handle()
#50 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(116): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#51 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(165): Illuminate\\Pipeline\\Pipeline->then()
#52 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(134): Illuminate\\Foundation\\Http\\Kernel->sendRequestThroughRouter()
#53 /var/www/bookstack/public/index.php(52): Illuminate\\Foundation\\Http\\Kernel->handle()
#54 {main}
Steps to Reproduce
- Configure OIDC according to docs
- Click on sign in with SSO
- See error: ID token validate failewd with error: Token audience value has 2 values, Expected 1
Expected Behaviour
- Configure OIDC according to docs
- Click on sign in with SSO
- Successfully log in
Screenshots or Additional Context

Browser Details
Brave 1.60.118 Chromium: 119.0.6045.163 on Windows 11
Exact BookStack Version
v23.10.2
Describe the Bug
When trying to use Zitadel Identity server for OIDC login to bookstack, it always fails as it does not expect audience claim to be array. According to standard,
audshould usually be array, only in special case, when only one audience is available, it may present it as string. Source: https://datatracker.ietf.org/doc/html/rfc7519#section-4.1.3It may not be usually presented as an array, but sadly Zitadel always sends
audas an array and there is currently no way to disable that behaviour, though it's kinda expected as they do not break the standard with that implementation.Stack trace in log:
Steps to Reproduce
Expected Behaviour
Screenshots or Additional Context
Browser Details
Brave 1.60.118 Chromium: 119.0.6045.163 on Windows 11
Exact BookStack Version
v23.10.2