feat: introduce a function to bind a teamfolder to a team

lib/private/Teams/TeamManager.php

@@ -16,6 +16,7 @@
 use OCP\IURLGenerator;
 use OCP\Server;
 use OCP\Teams\ITeamManager;
+use OCP\Teams\ITeamFolderProvider;
 use OCP\Teams\ITeamResourceProvider;
 use OCP\Teams\Team;
 use Psr\Container\ContainerExceptionInterface;
@@ -70,6 +71,17 @@ public function getProvider(string $providerId): ITeamResourceProvider {
 		throw new \RuntimeException('No provider found for id ' . $providerId);
 	}
 
+	#[\Override]
+	public function getTeamFolderProvider(): ?ITeamFolderProvider {
+		foreach ($this->getProviders() as $provider) {
+			if ($provider instanceof ITeamFolderProvider) {
+				return $provider;
+			}
+		}
+
+		return null;
+	}
+
 	#[\Override]
 	public function getSharedWith(string $teamId, string $userId): array {
 		if (!$this->hasTeamSupport()) {

lib/public/Teams/ITeamFolderProvider.php

@@ -0,0 +1,51 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2026 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCP\Teams;
+
+/**
+ * Provides the exclusive folder belonging to a team.
+ *
+ * Register implementations through
+ * {@see \OCP\AppFramework\Bootstrap\IRegistrationContext::registerTeamResourceProvider()}.
+ *
+ * @since 35.0.0
+ */
+interface ITeamFolderProvider extends ITeamResourceProvider {
+	/**
+	 * Return the folder exclusively linked to the team.
+	 *
+	 * @since 35.0.0
+	 */
+	public function getTeamFolder(string $teamId): ?TeamFolder;
+
+	/**
+	 * Create the exclusive folder for a team, or return its existing folder.
+	 *
+	 * @param Team $team The team that owns the folder.
+	 * @param int $quota Quota in bytes; zero means unlimited.
+	 * @since 35.0.0
+	 */
+	public function createTeamFolder(Team $team, int $quota = 0): TeamFolder;
+
+	/**
+	 * Remove the exclusive relationship but retain the folder and its contents.
+	 *
+	 * @return TeamFolder|null The unlinked folder, if one existed.
+	 * @since 35.0.0
+	 */
+	public function unlinkTeamFolder(string $teamId): ?TeamFolder;
+
+	/**
+	 * Remove the team folder and its contents.
+	 *
+	 * @since 35.0.0
+	 */
+	public function removeTeamFolder(string $teamId): bool;
+}

lib/public/Teams/ITeamManager.php

@@ -26,6 +26,14 @@ public function getProviders(): array;
 	 */
 	public function getProvider(string $providerId): ITeamResourceProvider;
 
+	/**
+	 * Get the registered provider of exclusive team folders.
+	 *
+	 * @return ITeamFolderProvider|null Null when no folder provider is enabled.
+	 * @since 35.0.0
+	 */
+	public function getTeamFolderProvider(): ?ITeamFolderProvider;
+
 	/**
 	 * Returns all team resources for a given team and user
 	 *

lib/public/Teams/TeamFolder.php

@@ -0,0 +1,52 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2026 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCP\Teams;
+
+/**
+ * A folder exclusively linked to a team.
+ *
+ * @since 35.0.0
+ */
+class TeamFolder implements \JsonSerializable {
+	/**
+	 * @since 35.0.0
+	 */
+	public function __construct(
+		private int $id,
+		private string $mountPoint,
+	) {
+	}
+
+	/**
+	 * @since 35.0.0
+	 */
+	public function getId(): int {
+		return $this->id;
+	}
+
+	/**
+	 * @since 35.0.0
+	 */
+	public function getMountPoint(): string {
+		return $this->mountPoint;
+	}
+
+	/**
+	 * @return array{id: int, mountPoint: string}
+	 * @since 35.0.0
+	 */
+	#[\Override]
+	public function jsonSerialize(): array {
+		return [
+			'id' => $this->id,
+			'mountPoint' => $this->mountPoint,
+		];
+	}
+}

tests/lib/Teams/TeamFolderTest.php

@@ -0,0 +1,23 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2026 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace Test\Teams;
+
+use OCP\Teams\TeamFolder;
+use Test\TestCase;
+
+class TeamFolderTest extends TestCase {
+	public function testSerializesFolderIdentity(): void {
+		$folder = new TeamFolder(42, 'Engineering');
+
+		$this->assertSame(42, $folder->getId());
+		$this->assertSame('Engineering', $folder->getMountPoint());
+		$this->assertSame(['id' => 42, 'mountPoint' => 'Engineering'], $folder->jsonSerialize());
+	}
+}

tests/lib/Teams/TeamManagerTest.php

@@ -0,0 +1,61 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2026 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace Test\Teams;
+
+use OC\AppFramework\Bootstrap\Coordinator;
+use OC\Teams\TeamManager;
+use OCA\Circles\CirclesManager;
+use OCP\IURLGenerator;
+use OCP\Teams\ITeamFolderProvider;
+use OCP\Teams\ITeamResourceProvider;
+use Test\TestCase;
+
+class TeamManagerTest extends TestCase {
+	public function testGetTeamFolderProviderReturnsNullWithoutTeamSupport(): void {
+		$teamManager = $this->createTeamManager(null);
+
+		$this->assertNull($teamManager->getTeamFolderProvider());
+	}
+
+	public function testGetTeamFolderProviderReturnsNullWithoutFolderProvider(): void {
+		$teamManager = $this->createTeamManager($this->createMock(CirclesManager::class));
+		$this->setProviders($teamManager, [
+			'other' => $this->createMock(ITeamResourceProvider::class),
+		]);
+
+		$this->assertNull($teamManager->getTeamFolderProvider());
+	}
+
+	public function testGetTeamFolderProviderReturnsRegisteredFolderProvider(): void {
+		$teamManager = $this->createTeamManager($this->createMock(CirclesManager::class));
+		$folderProvider = $this->createMock(ITeamFolderProvider::class);
+		$this->setProviders($teamManager, [
+			'other' => $this->createMock(ITeamResourceProvider::class),
+			'folder' => $folderProvider,
+		]);
+
+		$this->assertSame($folderProvider, $teamManager->getTeamFolderProvider());
+	}
+
+	private function createTeamManager(?CirclesManager $circlesManager): TeamManager {
+		return new TeamManager(
+			$this->createMock(Coordinator::class),
+			$this->createMock(IURLGenerator::class),
+			$circlesManager,
+		);
+	}
+
+	/**
+	 * @param array<string, ITeamResourceProvider> $providers
+	 */
+	private function setProviders(TeamManager $teamManager, array $providers): void {
+		(new \ReflectionProperty(TeamManager::class, 'providers'))->setValue($teamManager, $providers);
+	}
+}