fix: improve type hinting for unified share listing methods

apps/sharing/lib/Controller/ApiV1Controller.php

@@ -557,7 +557,7 @@ public function getShare(string $id, ?string $secret = null, array $arguments =
 	 * Get multiple shares.
 	 *
 	 * @param ?class-string<IShareSourceType> $filterSourceTypeClass Source type class to filter by.
-	 * @param ?string $filterSourceTypeValue Source type value to filter by.
+	 * @param ?non-empty-string $filterSourceTypeValue Source type value to filter by.
 	 * @param ?string $lastShareID The ID of the previous share. This is used as an offset and only shares with higher IDs are returned.
 	 * @param int<1, 100> $limit The number of shares to return.
 	 * @return DataResponse<Http::STATUS_OK, list<SharingShare>, array{}>|DataResponse<Http::STATUS_BAD_REQUEST, string, array{}>
@@ -578,6 +578,15 @@ public function getShares(?string $filterSourceTypeClass, ?string $filterSourceT
 			return new DataResponse('The limit is too high.', Http::STATUS_BAD_REQUEST);
 		}
 
+		/** @psalm-suppress TypeDoesNotContainType */
+		if ($filterSourceTypeValue === '') {
+			return new DataResponse('Filter source value is empty.', Http::STATUS_BAD_REQUEST);
+		}
+
+		if ($filterSourceTypeClass && !isset($this->registry->getSourceTypes()[$filterSourceTypeClass])) {
+			return new DataResponse('The filter source type is not registered: ' . $filterSourceTypeClass, Http::STATUS_BAD_REQUEST);
+		}
+
 		try {
 			$this->dbConnection->beginTransaction();
 

apps/sharing/openapi.json

@@ -3110,7 +3110,8 @@
                         "description": "Source type value to filter by.",
                         "schema": {
                             "type": "string",
-                            "nullable": true
+                            "nullable": true,
+                            "minLength": 1
                         }
                     },
                     {

apps/sharing/tests/Controller/ApiV1ControllerTest.php

@@ -8,7 +8,6 @@
 declare(strict_types=1);
 
 use NCU\Sharing\ISharingManager;
-use NCU\Sharing\ISharingRegistry;
 use NCU\Sharing\Permission\SharePermission;
 use NCU\Sharing\Property\ShareProperty;
 use NCU\Sharing\Recipient\ShareRecipient;
@@ -47,7 +46,7 @@ public function testDefaultShareAccessContext(): void {
 			Server::get(IRequest::class),
 			Server::get(IUserSession::class),
 			Server::get(ISharingManager::class),
-			Server::get(ISharingRegistry::class),
+			$this->registry,
 			Server::get(IFactory::class),
 			Server::get(IURLGenerator::class),
 			Server::get(IUserManager::class),
@@ -68,7 +67,7 @@ private function executeRequest(ShareAccessContext $accessContext, Closure $clos
 			Server::get(IRequest::class),
 			Server::get(IUserSession::class),
 			Server::get(ISharingManager::class),
-			Server::get(ISharingRegistry::class),
+			$this->registry,
 			Server::get(IFactory::class),
 			Server::get(IURLGenerator::class),
 			Server::get(IUserManager::class),

lib/private/Sharing/SharingBackend.php

@@ -556,6 +556,7 @@ private function hideDisabledUserShares(): bool {
 
 	/**
 	 * @param ?class-string<IShareSourceType> $filterSourceTypeClass
+	 * @param ?non-empty-string $filterSourceTypeValue
 	 * @return list<Share>
 	 */
 	private function list(ShareAccessContext $accessContext, ?string $filterShareID, ?string $filterSourceTypeClass, ?string $filterSourceTypeValue, ?string $lastShareID, ?int $limit): array {

lib/private/Sharing/SharingManager.php

@@ -698,7 +698,7 @@ private function validateInteraction(ShareAccessContext $accessContext, Share $s
 		$action = new ShareAction(null, array_values(array_map(static fn (SharePermission $permission): string => $permission->class, $share->getEnabledPermissions())));
 
 		$usersToCheck = [];
-		if ($share->owner->instance === null && ($ownerUser = $this->userManager->get($share->owner->userId)) !== null) {
+		if ($share->owner->instance === null && ($ownerUser = $this->userManager->get($share->owner->userId)) instanceof IUser) {
 			$usersToCheck[] = $ownerUser;
 		}
 

lib/unstable/Sharing/ISharingBackend.php

@@ -174,6 +174,7 @@ public function getShare(ShareAccessContext $accessContext, string $id): Share;
 	 * Get multiple shares.
 	 *
 	 * @param ?class-string<IShareSourceType> $filterSourceTypeClass
+	 * @param ?non-empty-string $filterSourceTypeValue
 	 * @param ?positive-int $limit
 	 * @return list<Share>
 	 * @experimental 35.0.0

lib/unstable/Sharing/ISharingManager.php

@@ -216,6 +216,7 @@ public function getShare(ShareAccessContext $accessContext, string $id): Share;
 	 * Get multiple shares.
 	 *
 	 * @param ?class-string<IShareSourceType> $filterSourceTypeClass
+	 * @param ?non-empty-string $filterSourceTypeValue
 	 * @param ?positive-int $limit
 	 * @return list<Share>
 	 * @experimental 35.0.0

openapi.json

@@ -39006,7 +39006,8 @@
                         "description": "Source type value to filter by.",
                         "schema": {
                             "type": "string",
-                            "nullable": true
+                            "nullable": true,
+                            "minLength": 1
                         }
                     },
                     {