Merge pull request #9518 from nextcloud/feature/5986/public_share_controller_middleware

apps/files_sharing/appinfo/routes.php

apps/files_sharing/js/public.js

.../files_sharing/lib/Controller/PublicPreviewController.php

apps/files_sharing/lib/Controller/ShareController.php

apps/files_sharing/lib/Middleware/SharingCheckMiddleware.php

..._sharing/tests/Controller/PublicPreviewControllerTest.php

apps/files_sharing/tests/Controller/ShareControllerTest.php

...s_sharing/tests/Middleware/SharingCheckMiddlewareTest.php

core/css/publicshareauth.css

core/js/publicshareauth.js

core/templates/publicshareauth.php

lib/composer/composer/autoload_classmap.php

lib/composer/composer/autoload_static.php

lib/private/AppFramework/DependencyInjection/DIContainer.php

...re/PublicShare/Exceptions/NeedAuthenticationException.php

...ramework/Middleware/PublicShare/PublicShareMiddleware.php

lib/private/legacy/template/functions.php

lib/public/AppFramework/AuthPublicShareController.php

lib/public/AppFramework/PublicShareController.php

.../acceptance/features/bootstrap/FilesSharingAppContext.php