4 files changed, 155 insertions, 66 deletions

diff --git a/lib/private/Files/Config/MountProviderCollection.php b/lib/private/Files/Config/MountProviderCollection.php
index 6a5407934c8..9d63184e05f 100644
--- a/lib/private/Files/Config/MountProviderCollection.php
+++ b/lib/private/Files/Config/MountProviderCollection.php
@@ -24,60 +24,43 @@ class MountProviderCollection implements IMountProviderCollection, Emitter {
 	use EmitterTrait;
 
 	/**
-	 * @var \OCP\Files\Config\IHomeMountProvider[]
+	 * @var list<IHomeMountProvider>
 	 */
-	private $homeProviders = [];
+	private array $homeProviders = [];
 
 	/**
-	 * @var \OCP\Files\Config\IMountProvider[]
+	 * @var list<IMountProvider>
 	 */
-	private $providers = [];
+	private array $providers = [];
 
-	/** @var \OCP\Files\Config\IRootMountProvider[] */
-	private $rootProviders = [];
+	/** @var list<IRootMountProvider> */
+	private array $rootProviders = [];
 
-	/**
-	 * @var \OCP\Files\Storage\IStorageFactory
-	 */
-	private $loader;
-
-	/**
-	 * @var \OCP\Files\Config\IUserMountCache
-	 */
-	private $mountCache;
-
-	/** @var callable[] */
-	private $mountFilters = [];
+	/** @var list<callable> */
+	private array $mountFilters = [];
 
-	private IEventLogger $eventLogger;
-
-	/**
-	 * @param \OCP\Files\Storage\IStorageFactory $loader
-	 * @param IUserMountCache $mountCache
-	 */
 	public function __construct(
-		IStorageFactory $loader,
-		IUserMountCache $mountCache,
-		IEventLogger $eventLogger,
+		private IStorageFactory $loader,
+		private IUserMountCache $mountCache,
+		private IEventLogger $eventLogger,
 	) {
-		$this->loader = $loader;
-		$this->mountCache = $mountCache;
-		$this->eventLogger = $eventLogger;
 	}
 
+	/**
+	 * @return list<IMountPoint>
+	 */
 	private function getMountsFromProvider(IMountProvider $provider, IUser $user, IStorageFactory $loader): array {
 		$class = str_replace('\\', '_', get_class($provider));
 		$uid = $user->getUID();
 		$this->eventLogger->start('fs:setup:provider:' . $class, "Getting mounts from $class for $uid");
 		$mounts = $provider->getMountsForUser($user, $loader) ?? [];
 		$this->eventLogger->end('fs:setup:provider:' . $class);
-		return $mounts;
+		return array_values($mounts);
 	}
 
 	/**
-	 * @param IUser $user
-	 * @param IMountProvider[] $providers
-	 * @return IMountPoint[]
+	 * @param list<IMountProvider> $providers
+	 * @return list<IMountPoint>
 	 */
 	private function getUserMountsForProviders(IUser $user, array $providers): array {
 		$loader = $this->loader;
@@ -90,10 +73,16 @@ class MountProviderCollection implements IMountProviderCollection, Emitter {
 		return $this->filterMounts($user, $mounts);
 	}
 
+	/**
+	 * @return list<IMountPoint>
+	 */
 	public function getMountsForUser(IUser $user): array {
 		return $this->getUserMountsForProviders($user, $this->providers);
 	}
 
+	/**
+	 * @return list<IMountPoint>
+	 */
 	public function getUserMountsForProviderClasses(IUser $user, array $mountProviderClasses): array {
 		$providers = array_filter(
 			$this->providers,
@@ -102,7 +91,10 @@ class MountProviderCollection implements IMountProviderCollection, Emitter {
 		return $this->getUserMountsForProviders($user, $providers);
 	}
 
-	public function addMountForUser(IUser $user, IMountManager $mountManager, ?callable $providerFilter = null) {
+	/**
+	 * @return list<IMountPoint>
+	 */
+	public function addMountForUser(IUser $user, IMountManager $mountManager, ?callable $providerFilter = null): array {
 		// shared mount provider gets to go last since it needs to know existing files
 		// to check for name collisions
 		$firstMounts = [];
@@ -135,18 +127,15 @@ class MountProviderCollection implements IMountProviderCollection, Emitter {
 		array_walk($lateMounts, [$mountManager, 'addMount']);
 		$this->eventLogger->end('fs:setup:add-mounts');
 
-		return array_merge($lateMounts, $firstMounts);
+		return array_values(array_merge($lateMounts, $firstMounts));
 	}
 
 	/**
 	 * Get the configured home mount for this user
 	 *
-	 * @param \OCP\IUser $user
-	 * @return \OCP\Files\Mount\IMountPoint
 	 * @since 9.1.0
 	 */
-	public function getHomeMountForUser(IUser $user) {
-		/** @var \OCP\Files\Config\IHomeMountProvider[] $providers */
+	public function getHomeMountForUser(IUser $user): IMountPoint {
 		$providers = array_reverse($this->homeProviders); // call the latest registered provider first to give apps an opportunity to overwrite builtin
 		foreach ($providers as $homeProvider) {
 			if ($mount = $homeProvider->getHomeMountForUser($user, $this->loader)) {
@@ -159,34 +148,36 @@ class MountProviderCollection implements IMountProviderCollection, Emitter {
 
 	/**
 	 * Add a provider for mount points
-	 *
-	 * @param \OCP\Files\Config\IMountProvider $provider
 	 */
-	public function registerProvider(IMountProvider $provider) {
+	public function registerProvider(IMountProvider $provider): void {
 		$this->providers[] = $provider;
 
 		$this->emit('\OC\Files\Config', 'registerMountProvider', [$provider]);
 	}
 
-	public function registerMountFilter(callable $filter) {
+	public function registerMountFilter(callable $filter): void {
 		$this->mountFilters[] = $filter;
 	}
 
-	private function filterMounts(IUser $user, array $mountPoints) {
-		return array_filter($mountPoints, function (IMountPoint $mountPoint) use ($user) {
+	/**
+	 * @param list<IMountPoint> $mountPoints
+	 * @return list<IMountPoint>
+	 */
+	private function filterMounts(IUser $user, array $mountPoints): array {
+		return array_values(array_filter($mountPoints, function (IMountPoint $mountPoint) use ($user) {
 			foreach ($this->mountFilters as $filter) {
 				if ($filter($mountPoint, $user) === false) {
 					return false;
 				}
 			}
 			return true;
-		});
+		}));
 	}
 
 	/**
 	 * Add a provider for home mount points
 	 *
-	 * @param \OCP\Files\Config\IHomeMountProvider $provider
+	 * @param IHomeMountProvider $provider
 	 * @since 9.1.0
 	 */
 	public function registerHomeProvider(IHomeMountProvider $provider) {
@@ -196,21 +187,19 @@ class MountProviderCollection implements IMountProviderCollection, Emitter {
 
 	/**
 	 * Get the mount cache which can be used to search for mounts without setting up the filesystem
-	 *
-	 * @return IUserMountCache
 	 */
-	public function getMountCache() {
+	public function getMountCache(): IUserMountCache {
 		return $this->mountCache;
 	}
 
-	public function registerRootProvider(IRootMountProvider $provider) {
+	public function registerRootProvider(IRootMountProvider $provider): void {
 		$this->rootProviders[] = $provider;
 	}
 
 	/**
 	 * Get all root mountpoints
 	 *
-	 * @return \OCP\Files\Mount\IMountPoint[]
+	 * @return list<IMountPoint>
 	 * @since 20.0.0
 	 */
 	public function getRootMounts(): array {
@@ -226,16 +215,33 @@ class MountProviderCollection implements IMountProviderCollection, Emitter {
 			throw new \Exception('No root mounts provided by any provider');
 		}
 
-		return $mounts;
+		return array_values($mounts);
 	}
 
-	public function clearProviders() {
+	public function clearProviders(): void {
 		$this->providers = [];
 		$this->homeProviders = [];
 		$this->rootProviders = [];
 	}
 
+	/**
+	 * @return list<IMountProvider>
+	 */
 	public function getProviders(): array {
 		return $this->providers;
 	}
+
+	/**
+	 * @return list<IHomeMountProvider>
+	 */
+	public function getHomeProviders(): array {
+		return $this->homeProviders;
+	}
+
+	/**
+	 * @return list<IRootMountProvider>
+	 */
+	public function getRootProviders(): array {
+		return $this->rootProviders;
+	}
 }
diff --git a/lib/private/Files/Config/UserMountCache.php b/lib/private/Files/Config/UserMountCache.php
index 9c1e2314262..09ac6d1416a 100644
--- a/lib/private/Files/Config/UserMountCache.php
+++ b/lib/private/Files/Config/UserMountCache.php
@@ -11,6 +11,10 @@ use OC\User\LazyUser;
 use OCP\Cache\CappedMemoryCache;
 use OCP\DB\QueryBuilder\IQueryBuilder;
 use OCP\Diagnostics\IEventLogger;
+use OCP\EventDispatcher\IEventDispatcher;
+use OCP\Files\Config\Event\UserMountAddedEvent;
+use OCP\Files\Config\Event\UserMountRemovedEvent;
+use OCP\Files\Config\Event\UserMountUpdatedEvent;
 use OCP\Files\Config\ICachedMountFileInfo;
 use OCP\Files\Config\ICachedMountInfo;
 use OCP\Files\Config\IUserMountCache;
@@ -46,6 +50,7 @@ class UserMountCache implements IUserMountCache {
 		private IUserManager $userManager,
 		private LoggerInterface $logger,
 		private IEventLogger $eventLogger,
+		private IEventDispatcher $eventDispatcher,
 	) {
 		$this->cacheInfoCache = new CappedMemoryCache();
 		$this->internalPathCache = new CappedMemoryCache();
@@ -108,17 +113,29 @@ class UserMountCache implements IUserMountCache {
 					$this->removeFromCache($mount);
 					unset($this->mountsForUsers[$userUID][$mount->getKey()]);
 				}
-				foreach ($changedMounts as $mount) {
-					$this->logger->debug("Updating mount '{$mount->getKey()}' for user '$userUID'", ['app' => 'files', 'mount_provider' => $mount->getMountProvider()]);
-					$this->updateCachedMount($mount);
+				foreach ($changedMounts as $mountPair) {
+					$newMount = $mountPair[1];
+					$this->logger->debug("Updating mount '{$newMount->getKey()}' for user '$userUID'", ['app' => 'files', 'mount_provider' => $newMount->getMountProvider()]);
+					$this->updateCachedMount($newMount);
 					/** @psalm-suppress InvalidArgument */
-					$this->mountsForUsers[$userUID][$mount->getKey()] = $mount;
+					$this->mountsForUsers[$userUID][$newMount->getKey()] = $newMount;
 				}
 				$this->connection->commit();
 			} catch (\Throwable $e) {
 				$this->connection->rollBack();
 				throw $e;
 			}
+
+			// Only fire events after all mounts have already been adjusted in the database.
+			foreach ($addedMounts as $mount) {
+				$this->eventDispatcher->dispatchTyped(new UserMountAddedEvent($mount));
+			}
+			foreach ($removedMounts as $mount) {
+				$this->eventDispatcher->dispatchTyped(new UserMountRemovedEvent($mount));
+			}
+			foreach ($changedMounts as $mountPair) {
+				$this->eventDispatcher->dispatchTyped(new UserMountUpdatedEvent($mountPair[0], $mountPair[1]));
+			}
 		}
 		$this->eventLogger->end('fs:setup:user:register');
 	}
@@ -126,9 +143,9 @@ class UserMountCache implements IUserMountCache {
 	/**
 	 * @param array<string, ICachedMountInfo> $newMounts
 	 * @param array<string, ICachedMountInfo> $cachedMounts
-	 * @return ICachedMountInfo[]
+	 * @return list<list{0: ICachedMountInfo, 1: ICachedMountInfo}> Pairs of old and new mounts
 	 */
-	private function findChangedMounts(array $newMounts, array $cachedMounts) {
+	private function findChangedMounts(array $newMounts, array $cachedMounts): array {
 		$changed = [];
 		foreach ($cachedMounts as $key => $cachedMount) {
 			if (isset($newMounts[$key])) {
@@ -138,7 +155,7 @@ class UserMountCache implements IUserMountCache {
 					$newMount->getMountId() !== $cachedMount->getMountId() ||
 					$newMount->getMountProvider() !== $cachedMount->getMountProvider()
 				) {
-					$changed[] = $newMount;
+					$changed[] = [$cachedMount, $newMount];
 				}
 			}
 		}
diff --git a/lib/private/Files/SetupManager.php b/lib/private/Files/SetupManager.php
index 2b8121a529d..7f97187179e 100644
--- a/lib/private/Files/SetupManager.php
+++ b/lib/private/Files/SetupManager.php
@@ -34,6 +34,7 @@ use OCP\EventDispatcher\IEventDispatcher;
 use OCP\Files\Config\ICachedMountInfo;
 use OCP\Files\Config\IHomeMountProvider;
 use OCP\Files\Config\IMountProvider;
+use OCP\Files\Config\IRootMountProvider;
 use OCP\Files\Config\IUserMountCache;
 use OCP\Files\Events\BeforeFileSystemSetupEvent;
 use OCP\Files\Events\InvalidateMountCacheEvent;
@@ -280,9 +281,13 @@ class SetupManager {
 		$mounts = array_filter($mounts, function (IMountPoint $mount) use ($userRoot) {
 			return str_starts_with($mount->getMountPoint(), $userRoot);
 		});
-		$allProviders = array_map(function (IMountProvider $provider) {
+		$allProviders = array_map(function (IMountProvider|IHomeMountProvider|IRootMountProvider $provider) {
 			return get_class($provider);
-		}, $this->mountProviderCollection->getProviders());
+		}, array_merge(
+			$this->mountProviderCollection->getProviders(),
+			$this->mountProviderCollection->getHomeProviders(),
+			$this->mountProviderCollection->getRootProviders(),
+		));
 		$newProviders = array_diff($allProviders, $previouslySetupProviders);
 		$mounts = array_filter($mounts, function (IMountPoint $mount) use ($previouslySetupProviders) {
 			return !in_array($mount->getMountProvider(), $previouslySetupProviders);
diff --git a/lib/private/Files/Template/TemplateManager.php b/lib/private/Files/Template/TemplateManager.php
index 8032cdf941f..80ef5a14786 100644
--- a/lib/private/Files/Template/TemplateManager.php
+++ b/lib/private/Files/Template/TemplateManager.php
@@ -19,6 +19,7 @@ use OCP\Files\IRootFolder;
 use OCP\Files\Node;
 use OCP\Files\NotFoundException;
 use OCP\Files\Template\BeforeGetTemplatesEvent;
+use OCP\Files\Template\Field;
 use OCP\Files\Template\FileCreatedFromTemplateEvent;
 use OCP\Files\Template\ICustomTemplateProvider;
 use OCP\Files\Template\ITemplateManager;
@@ -125,6 +126,19 @@ class TemplateManager implements ITemplateManager {
 		}, $this->listCreators()));
 	}
 
+	public function listTemplateFields(int $fileId): array {
+		foreach ($this->listCreators() as $creator) {
+			$fields = $this->getTemplateFields($creator, $fileId);
+			if (empty($fields)) {
+				continue;
+			}
+
+			return $fields;
+		}
+
+		return [];
+	}
+
 	/**
 	 * @param string $filePath
 	 * @param string $templateId
@@ -187,6 +201,20 @@ class TemplateManager implements ITemplateManager {
 	 * @return list<Template>
 	 */
 	private function getTemplateFiles(TemplateFileCreator $type): array {
+		$templates = array_merge(
+			$this->getProviderTemplates($type),
+			$this->getUserTemplates($type)
+		);
+
+		$this->eventDispatcher->dispatchTyped(new BeforeGetTemplatesEvent($templates, false));
+
+		return $templates;
+	}
+
+	/**
+	 * @return list<Template>
+	 */
+	private function getProviderTemplates(TemplateFileCreator $type): array {
 		$templates = [];
 		foreach ($this->getRegisteredProviders() as $provider) {
 			foreach ($type->getMimetypes() as $mimetype) {
@@ -195,11 +223,22 @@ class TemplateManager implements ITemplateManager {
 				}
 			}
 		}
+
+		return $templates;
+	}
+
+	/**
+	 * @return list<Template>
+	 */
+	private function getUserTemplates(TemplateFileCreator $type): array {
+		$templates = [];
+
 		try {
 			$userTemplateFolder = $this->getTemplateFolder();
 		} catch (\Exception $e) {
 			return $templates;
 		}
+
 		foreach ($type->getMimetypes() as $mimetype) {
 			foreach ($userTemplateFolder->searchByMime($mimetype) as $templateFile) {
 				$template = new Template(
@@ -212,11 +251,33 @@ class TemplateManager implements ITemplateManager {
 			}
 		}
 
-		$this->eventDispatcher->dispatchTyped(new BeforeGetTemplatesEvent($templates));
-
 		return $templates;
 	}
 
+	/*
+	 * @return list<Field>
+	 */
+	private function getTemplateFields(TemplateFileCreator $type, int $fileId): array {
+		$providerTemplates = $this->getProviderTemplates($type);
+		$userTemplates = $this->getUserTemplates($type);
+
+		$matchedTemplates = array_filter(
+			array_merge($providerTemplates, $userTemplates),
+			function (Template $template) use ($fileId) {
+				return $template->jsonSerialize()['fileid'] === $fileId;
+			});
+
+		if (empty($matchedTemplates)) {
+			return [];
+		}
+
+		$this->eventDispatcher->dispatchTyped(new BeforeGetTemplatesEvent($matchedTemplates, true));
+
+		return array_values(array_map(function (Template $template) {
+			return $template->jsonSerialize()['fields'] ?? [];
+		}, $matchedTemplates));
+	}
+
 	/**
 	 * @param Node|File $file
 	 * @return array