nextcloud / server

lib/private/Share20/Manager.php

Indentation +1988 added lines, -1988 removed lines

@@ -82,2013 +82,2013 @@
  * This class is the communication hub for all sharing related operations.
  */
 class Manager implements IManager {
-	/** @var IProviderFactory */
-	private $factory;
-	private LoggerInterface $logger;
-	/** @var IConfig */
-	private $config;
-	/** @var ISecureRandom */
-	private $secureRandom;
-	/** @var IHasher */
-	private $hasher;
-	/** @var IMountManager */
-	private $mountManager;
-	/** @var IGroupManager */
-	private $groupManager;
-	/** @var IL10N */
-	private $l;
-	/** @var IFactory */
-	private $l10nFactory;
-	/** @var IUserManager */
-	private $userManager;
-	/** @var IRootFolder */
-	private $rootFolder;
-	/** @var CappedMemoryCache */
-	private $sharingDisabledForUsersCache;
-	/** @var EventDispatcherInterface */
-	private $legacyDispatcher;
-	/** @var LegacyHooks */
-	private $legacyHooks;
-	/** @var IMailer */
-	private $mailer;
-	/** @var IURLGenerator */
-	private $urlGenerator;
-	/** @var \OC_Defaults */
-	private $defaults;
-	/** @var IEventDispatcher */
-	private $dispatcher;
-	/** @var IUserSession */
-	private $userSession;
-	/** @var KnownUserService */
-	private $knownUserService;
-
-	public function __construct(
-		LoggerInterface $logger,
-		IConfig $config,
-		ISecureRandom $secureRandom,
-		IHasher $hasher,
-		IMountManager $mountManager,
-		IGroupManager $groupManager,
-		IL10N $l,
-		IFactory $l10nFactory,
-		IProviderFactory $factory,
-		IUserManager $userManager,
-		IRootFolder $rootFolder,
-		EventDispatcherInterface $legacyDispatcher,
-		IMailer $mailer,
-		IURLGenerator $urlGenerator,
-		\OC_Defaults $defaults,
-		IEventDispatcher $dispatcher,
-		IUserSession $userSession,
-		KnownUserService $knownUserService
-	) {
-		$this->logger = $logger;
-		$this->config = $config;
-		$this->secureRandom = $secureRandom;
-		$this->hasher = $hasher;
-		$this->mountManager = $mountManager;
-		$this->groupManager = $groupManager;
-		$this->l = $l;
-		$this->l10nFactory = $l10nFactory;
-		$this->factory = $factory;
-		$this->userManager = $userManager;
-		$this->rootFolder = $rootFolder;
-		$this->legacyDispatcher = $legacyDispatcher;
-		$this->sharingDisabledForUsersCache = new CappedMemoryCache();
-		// The constructor of LegacyHooks registers the listeners of share events
-		// do not remove if those are not properly migrated
-		$this->legacyHooks = new LegacyHooks($this->legacyDispatcher);
-		$this->mailer = $mailer;
-		$this->urlGenerator = $urlGenerator;
-		$this->defaults = $defaults;
-		$this->dispatcher = $dispatcher;
-		$this->userSession = $userSession;
-		$this->knownUserService = $knownUserService;
-	}
-
-	/**
-	 * Convert from a full share id to a tuple (providerId, shareId)
-	 *
-	 * @param string $id
-	 * @return string[]
-	 */
-	private function splitFullId($id) {
-		return explode(':', $id, 2);
-	}
-
-	/**
-	 * Verify if a password meets all requirements
-	 *
-	 * @param string $password
-	 * @throws \Exception
-	 */
-	protected function verifyPassword($password) {
-		if ($password === null) {
-			// No password is set, check if this is allowed.
-			if ($this->shareApiLinkEnforcePassword()) {
-				throw new \InvalidArgumentException('Passwords are enforced for link and mail shares');
-			}
-
-			return;
-		}
-
-		// Let others verify the password
-		try {
-			$this->legacyDispatcher->dispatch(new ValidatePasswordPolicyEvent($password));
-		} catch (HintException $e) {
-			throw new \Exception($e->getHint());
-		}
-	}
-
-	/**
-	 * Check for generic requirements before creating a share
-	 *
-	 * @param IShare $share
-	 * @throws \InvalidArgumentException
-	 * @throws GenericShareException
-	 *
-	 * @suppress PhanUndeclaredClassMethod
-	 */
-	protected function generalCreateChecks(IShare $share) {
-		if ($share->getShareType() === IShare::TYPE_USER) {
-			// We expect a valid user as sharedWith for user shares
-			if (!$this->userManager->userExists($share->getSharedWith())) {
-				throw new \InvalidArgumentException('SharedWith is not a valid user');
-			}
-		} elseif ($share->getShareType() === IShare::TYPE_GROUP) {
-			// We expect a valid group as sharedWith for group shares
-			if (!$this->groupManager->groupExists($share->getSharedWith())) {
-				throw new \InvalidArgumentException('SharedWith is not a valid group');
-			}
-		} elseif ($share->getShareType() === IShare::TYPE_LINK) {
-			// No check for TYPE_EMAIL here as we have a recipient for them
-			if ($share->getSharedWith() !== null) {
-				throw new \InvalidArgumentException('SharedWith should be empty');
-			}
-		} elseif ($share->getShareType() === IShare::TYPE_EMAIL) {
-			if ($share->getSharedWith() === null) {
-				throw new \InvalidArgumentException('SharedWith should not be empty');
-			}
-		} elseif ($share->getShareType() === IShare::TYPE_REMOTE) {
-			if ($share->getSharedWith() === null) {
-				throw new \InvalidArgumentException('SharedWith should not be empty');
-			}
-		} elseif ($share->getShareType() === IShare::TYPE_REMOTE_GROUP) {
-			if ($share->getSharedWith() === null) {
-				throw new \InvalidArgumentException('SharedWith should not be empty');
-			}
-		} elseif ($share->getShareType() === IShare::TYPE_CIRCLE) {
-			$circle = \OCA\Circles\Api\v1\Circles::detailsCircle($share->getSharedWith());
-			if ($circle === null) {
-				throw new \InvalidArgumentException('SharedWith is not a valid circle');
-			}
-		} elseif ($share->getShareType() === IShare::TYPE_ROOM) {
-		} elseif ($share->getShareType() === IShare::TYPE_DECK) {
-		} elseif ($share->getShareType() === IShare::TYPE_SCIENCEMESH) {
-		} else {
-			// We cannot handle other types yet
-			throw new \InvalidArgumentException('unknown share type');
-		}
-
-		// Verify the initiator of the share is set
-		if ($share->getSharedBy() === null) {
-			throw new \InvalidArgumentException('SharedBy should be set');
-		}
-
-		// Cannot share with yourself
-		if ($share->getShareType() === IShare::TYPE_USER &&
-			$share->getSharedWith() === $share->getSharedBy()) {
-			throw new \InvalidArgumentException('Cannot share with yourself');
-		}
-
-		// The path should be set
-		if ($share->getNode() === null) {
-			throw new \InvalidArgumentException('Path should be set');
-		}
-
-		// And it should be a file or a folder
-		if (!($share->getNode() instanceof \OCP\Files\File) &&
-			!($share->getNode() instanceof \OCP\Files\Folder)) {
-			throw new \InvalidArgumentException('Path should be either a file or a folder');
-		}
-
-		// And you cannot share your rootfolder
-		if ($this->userManager->userExists($share->getSharedBy())) {
-			$userFolder = $this->rootFolder->getUserFolder($share->getSharedBy());
-		} else {
-			$userFolder = $this->rootFolder->getUserFolder($share->getShareOwner());
-		}
-		if ($userFolder->getId() === $share->getNode()->getId()) {
-			throw new \InvalidArgumentException('You cannot share your root folder');
-		}
-
-		// Check if we actually have share permissions
-		if (!$share->getNode()->isShareable()) {
-			$message_t = $this->l->t('You are not allowed to share %s', [$share->getNode()->getName()]);
-			throw new GenericShareException($message_t, $message_t, 404);
-		}
-
-		// Permissions should be set
-		if ($share->getPermissions() === null) {
-			throw new \InvalidArgumentException('A share requires permissions');
-		}
-
-		$isFederatedShare = $share->getNode()->getStorage()->instanceOfStorage('\OCA\Files_Sharing\External\Storage');
-		$permissions = 0;
-
-		if (!$isFederatedShare && $share->getNode()->getOwner() && $share->getNode()->getOwner()->getUID() !== $share->getSharedBy()) {
-			$userMounts = array_filter($userFolder->getById($share->getNode()->getId()), function ($mount) {
-				// We need to filter since there might be other mountpoints that contain the file
-				// e.g. if the user has access to the same external storage that the file is originating from
-				return $mount->getStorage()->instanceOfStorage(ISharedStorage::class);
-			});
-			$userMount = array_shift($userMounts);
-			if ($userMount === null) {
-				throw new GenericShareException('Could not get proper share mount for ' . $share->getNode()->getId() . '. Failing since else the next calls are called with null');
-			}
-			$mount = $userMount->getMountPoint();
-			// When it's a reshare use the parent share permissions as maximum
-			$userMountPointId = $mount->getStorageRootId();
-			$userMountPoints = $userFolder->getById($userMountPointId);
-			$userMountPoint = array_shift($userMountPoints);
-
-			if ($userMountPoint === null) {
-				throw new GenericShareException('Could not get proper user mount for ' . $userMountPointId . '. Failing since else the next calls are called with null');
-			}
-
-			/* Check if this is an incoming share */
-			$incomingShares = $this->getSharedWith($share->getSharedBy(), IShare::TYPE_USER, $userMountPoint, -1, 0);
-			$incomingShares = array_merge($incomingShares, $this->getSharedWith($share->getSharedBy(), IShare::TYPE_GROUP, $userMountPoint, -1, 0));
-			$incomingShares = array_merge($incomingShares, $this->getSharedWith($share->getSharedBy(), IShare::TYPE_CIRCLE, $userMountPoint, -1, 0));
-			$incomingShares = array_merge($incomingShares, $this->getSharedWith($share->getSharedBy(), IShare::TYPE_ROOM, $userMountPoint, -1, 0));
-
-			/** @var IShare[] $incomingShares */
-			if (!empty($incomingShares)) {
-				foreach ($incomingShares as $incomingShare) {
-					$permissions |= $incomingShare->getPermissions();
-				}
-			}
-		} else {
-			/*
+    /** @var IProviderFactory */
+    private $factory;
+    private LoggerInterface $logger;
+    /** @var IConfig */
+    private $config;
+    /** @var ISecureRandom */
+    private $secureRandom;
+    /** @var IHasher */
+    private $hasher;
+    /** @var IMountManager */
+    private $mountManager;
+    /** @var IGroupManager */
+    private $groupManager;
+    /** @var IL10N */
+    private $l;
+    /** @var IFactory */
+    private $l10nFactory;
+    /** @var IUserManager */
+    private $userManager;
+    /** @var IRootFolder */
+    private $rootFolder;
+    /** @var CappedMemoryCache */
+    private $sharingDisabledForUsersCache;
+    /** @var EventDispatcherInterface */
+    private $legacyDispatcher;
+    /** @var LegacyHooks */
+    private $legacyHooks;
+    /** @var IMailer */
+    private $mailer;
+    /** @var IURLGenerator */
+    private $urlGenerator;
+    /** @var \OC_Defaults */
+    private $defaults;
+    /** @var IEventDispatcher */
+    private $dispatcher;
+    /** @var IUserSession */
+    private $userSession;
+    /** @var KnownUserService */
+    private $knownUserService;
+
+    public function __construct(
+        LoggerInterface $logger,
+        IConfig $config,
+        ISecureRandom $secureRandom,
+        IHasher $hasher,
+        IMountManager $mountManager,
+        IGroupManager $groupManager,
+        IL10N $l,
+        IFactory $l10nFactory,
+        IProviderFactory $factory,
+        IUserManager $userManager,
+        IRootFolder $rootFolder,
+        EventDispatcherInterface $legacyDispatcher,
+        IMailer $mailer,
+        IURLGenerator $urlGenerator,
+        \OC_Defaults $defaults,
+        IEventDispatcher $dispatcher,
+        IUserSession $userSession,
+        KnownUserService $knownUserService
+    ) {
+        $this->logger = $logger;
+        $this->config = $config;
+        $this->secureRandom = $secureRandom;
+        $this->hasher = $hasher;
+        $this->mountManager = $mountManager;
+        $this->groupManager = $groupManager;
+        $this->l = $l;
+        $this->l10nFactory = $l10nFactory;
+        $this->factory = $factory;
+        $this->userManager = $userManager;
+        $this->rootFolder = $rootFolder;
+        $this->legacyDispatcher = $legacyDispatcher;
+        $this->sharingDisabledForUsersCache = new CappedMemoryCache();
+        // The constructor of LegacyHooks registers the listeners of share events
+        // do not remove if those are not properly migrated
+        $this->legacyHooks = new LegacyHooks($this->legacyDispatcher);
+        $this->mailer = $mailer;
+        $this->urlGenerator = $urlGenerator;
+        $this->defaults = $defaults;
+        $this->dispatcher = $dispatcher;
+        $this->userSession = $userSession;
+        $this->knownUserService = $knownUserService;
+    }
+
+    /**
+     * Convert from a full share id to a tuple (providerId, shareId)
+     *
+     * @param string $id
+     * @return string[]
+     */
+    private function splitFullId($id) {
+        return explode(':', $id, 2);
+    }
+
+    /**
+     * Verify if a password meets all requirements
+     *
+     * @param string $password
+     * @throws \Exception
+     */
+    protected function verifyPassword($password) {
+        if ($password === null) {
+            // No password is set, check if this is allowed.
+            if ($this->shareApiLinkEnforcePassword()) {
+                throw new \InvalidArgumentException('Passwords are enforced for link and mail shares');
+            }
+
+            return;
+        }
+
+        // Let others verify the password
+        try {
+            $this->legacyDispatcher->dispatch(new ValidatePasswordPolicyEvent($password));
+        } catch (HintException $e) {
+            throw new \Exception($e->getHint());
+        }
+    }
+
+    /**
+     * Check for generic requirements before creating a share
+     *
+     * @param IShare $share
+     * @throws \InvalidArgumentException
+     * @throws GenericShareException
+     *
+     * @suppress PhanUndeclaredClassMethod
+     */
+    protected function generalCreateChecks(IShare $share) {
+        if ($share->getShareType() === IShare::TYPE_USER) {
+            // We expect a valid user as sharedWith for user shares
+            if (!$this->userManager->userExists($share->getSharedWith())) {
+                throw new \InvalidArgumentException('SharedWith is not a valid user');
+            }
+        } elseif ($share->getShareType() === IShare::TYPE_GROUP) {
+            // We expect a valid group as sharedWith for group shares
+            if (!$this->groupManager->groupExists($share->getSharedWith())) {
+                throw new \InvalidArgumentException('SharedWith is not a valid group');
+            }
+        } elseif ($share->getShareType() === IShare::TYPE_LINK) {
+            // No check for TYPE_EMAIL here as we have a recipient for them
+            if ($share->getSharedWith() !== null) {
+                throw new \InvalidArgumentException('SharedWith should be empty');
+            }
+        } elseif ($share->getShareType() === IShare::TYPE_EMAIL) {
+            if ($share->getSharedWith() === null) {
+                throw new \InvalidArgumentException('SharedWith should not be empty');
+            }
+        } elseif ($share->getShareType() === IShare::TYPE_REMOTE) {
+            if ($share->getSharedWith() === null) {
+                throw new \InvalidArgumentException('SharedWith should not be empty');
+            }
+        } elseif ($share->getShareType() === IShare::TYPE_REMOTE_GROUP) {
+            if ($share->getSharedWith() === null) {
+                throw new \InvalidArgumentException('SharedWith should not be empty');
+            }
+        } elseif ($share->getShareType() === IShare::TYPE_CIRCLE) {
+            $circle = \OCA\Circles\Api\v1\Circles::detailsCircle($share->getSharedWith());
+            if ($circle === null) {
+                throw new \InvalidArgumentException('SharedWith is not a valid circle');
+            }
+        } elseif ($share->getShareType() === IShare::TYPE_ROOM) {
+        } elseif ($share->getShareType() === IShare::TYPE_DECK) {
+        } elseif ($share->getShareType() === IShare::TYPE_SCIENCEMESH) {
+        } else {
+            // We cannot handle other types yet
+            throw new \InvalidArgumentException('unknown share type');
+        }
+
+        // Verify the initiator of the share is set
+        if ($share->getSharedBy() === null) {
+            throw new \InvalidArgumentException('SharedBy should be set');
+        }
+
+        // Cannot share with yourself
+        if ($share->getShareType() === IShare::TYPE_USER &&
+            $share->getSharedWith() === $share->getSharedBy()) {
+            throw new \InvalidArgumentException('Cannot share with yourself');
+        }
+
+        // The path should be set
+        if ($share->getNode() === null) {
+            throw new \InvalidArgumentException('Path should be set');
+        }
+
+        // And it should be a file or a folder
+        if (!($share->getNode() instanceof \OCP\Files\File) &&
+            !($share->getNode() instanceof \OCP\Files\Folder)) {
+            throw new \InvalidArgumentException('Path should be either a file or a folder');
+        }
+
+        // And you cannot share your rootfolder
+        if ($this->userManager->userExists($share->getSharedBy())) {
+            $userFolder = $this->rootFolder->getUserFolder($share->getSharedBy());
+        } else {
+            $userFolder = $this->rootFolder->getUserFolder($share->getShareOwner());
+        }
+        if ($userFolder->getId() === $share->getNode()->getId()) {
+            throw new \InvalidArgumentException('You cannot share your root folder');
+        }
+
+        // Check if we actually have share permissions
+        if (!$share->getNode()->isShareable()) {
+            $message_t = $this->l->t('You are not allowed to share %s', [$share->getNode()->getName()]);
+            throw new GenericShareException($message_t, $message_t, 404);
+        }
+
+        // Permissions should be set
+        if ($share->getPermissions() === null) {
+            throw new \InvalidArgumentException('A share requires permissions');
+        }
+
+        $isFederatedShare = $share->getNode()->getStorage()->instanceOfStorage('\OCA\Files_Sharing\External\Storage');
+        $permissions = 0;
+
+        if (!$isFederatedShare && $share->getNode()->getOwner() && $share->getNode()->getOwner()->getUID() !== $share->getSharedBy()) {
+            $userMounts = array_filter($userFolder->getById($share->getNode()->getId()), function ($mount) {
+                // We need to filter since there might be other mountpoints that contain the file
+                // e.g. if the user has access to the same external storage that the file is originating from
+                return $mount->getStorage()->instanceOfStorage(ISharedStorage::class);
+            });
+            $userMount = array_shift($userMounts);
+            if ($userMount === null) {
+                throw new GenericShareException('Could not get proper share mount for ' . $share->getNode()->getId() . '. Failing since else the next calls are called with null');
+            }
+            $mount = $userMount->getMountPoint();
+            // When it's a reshare use the parent share permissions as maximum
+            $userMountPointId = $mount->getStorageRootId();
+            $userMountPoints = $userFolder->getById($userMountPointId);
+            $userMountPoint = array_shift($userMountPoints);
+
+            if ($userMountPoint === null) {
+                throw new GenericShareException('Could not get proper user mount for ' . $userMountPointId . '. Failing since else the next calls are called with null');
+            }
+
+            /* Check if this is an incoming share */
+            $incomingShares = $this->getSharedWith($share->getSharedBy(), IShare::TYPE_USER, $userMountPoint, -1, 0);
+            $incomingShares = array_merge($incomingShares, $this->getSharedWith($share->getSharedBy(), IShare::TYPE_GROUP, $userMountPoint, -1, 0));
+            $incomingShares = array_merge($incomingShares, $this->getSharedWith($share->getSharedBy(), IShare::TYPE_CIRCLE, $userMountPoint, -1, 0));
+            $incomingShares = array_merge($incomingShares, $this->getSharedWith($share->getSharedBy(), IShare::TYPE_ROOM, $userMountPoint, -1, 0));
+
+            /** @var IShare[] $incomingShares */
+            if (!empty($incomingShares)) {
+                foreach ($incomingShares as $incomingShare) {
+                    $permissions |= $incomingShare->getPermissions();
+                }
+            }
+        } else {
+            /*
 			 * Quick fix for #23536
 			 * Non moveable mount points do not have update and delete permissions
 			 * while we 'most likely' do have that on the storage.
 			 */
-			$permissions = $share->getNode()->getPermissions();
-			if (!($share->getNode()->getMountPoint() instanceof MoveableMount)) {
-				$permissions |= \OCP\Constants::PERMISSION_DELETE | \OCP\Constants::PERMISSION_UPDATE;
-			}
-		}
-
-		// Check that we do not share with more permissions than we have
-		if ($share->getPermissions() & ~$permissions) {
-			$path = $userFolder->getRelativePath($share->getNode()->getPath());
-			$message_t = $this->l->t('Cannot increase permissions of %s', [$path]);
-			throw new GenericShareException($message_t, $message_t, 404);
-		}
-
-
-		// Check that read permissions are always set
-		// Link shares are allowed to have no read permissions to allow upload to hidden folders
-		$noReadPermissionRequired = $share->getShareType() === IShare::TYPE_LINK
-			|| $share->getShareType() === IShare::TYPE_EMAIL;
-		if (!$noReadPermissionRequired &&
-			($share->getPermissions() & \OCP\Constants::PERMISSION_READ) === 0) {
-			throw new \InvalidArgumentException('Shares need at least read permissions');
-		}
-
-		if ($share->getNode() instanceof \OCP\Files\File) {
-			if ($share->getPermissions() & \OCP\Constants::PERMISSION_DELETE) {
-				$message_t = $this->l->t('Files cannot be shared with delete permissions');
-				throw new GenericShareException($message_t);
-			}
-			if ($share->getPermissions() & \OCP\Constants::PERMISSION_CREATE) {
-				$message_t = $this->l->t('Files cannot be shared with create permissions');
-				throw new GenericShareException($message_t);
-			}
-		}
-	}
-
-	/**
-	 * Validate if the expiration date fits the system settings
-	 *
-	 * @param IShare $share The share to validate the expiration date of
-	 * @return IShare The modified share object
-	 * @throws GenericShareException
-	 * @throws \InvalidArgumentException
-	 * @throws \Exception
-	 */
-	protected function validateExpirationDateInternal(IShare $share) {
-		$isRemote = $share->getShareType() === IShare::TYPE_REMOTE || $share->getShareType() === IShare::TYPE_REMOTE_GROUP;
-
-		$expirationDate = $share->getExpirationDate();
-
-		if ($expirationDate !== null) {
-			//Make sure the expiration date is a date
-			$expirationDate->setTime(0, 0, 0);
-
-			$date = new \DateTime();
-			$date->setTime(0, 0, 0);
-			if ($date >= $expirationDate) {
-				$message = $this->l->t('Expiration date is in the past');
-				throw new GenericShareException($message, $message, 404);
-			}
-		}
-
-		// If expiredate is empty set a default one if there is a default
-		$fullId = null;
-		try {
-			$fullId = $share->getFullId();
-		} catch (\UnexpectedValueException $e) {
-			// This is a new share
-		}
-
-		if ($isRemote) {
-			$defaultExpireDate = $this->shareApiRemoteDefaultExpireDate();
-			$defaultExpireDays = $this->shareApiRemoteDefaultExpireDays();
-			$configProp = 'remote_defaultExpDays';
-			$isEnforced = $this->shareApiRemoteDefaultExpireDateEnforced();
-		} else {
-			$defaultExpireDate = $this->shareApiInternalDefaultExpireDate();
-			$defaultExpireDays = $this->shareApiInternalDefaultExpireDays();
-			$configProp = 'internal_defaultExpDays';
-			$isEnforced = $this->shareApiInternalDefaultExpireDateEnforced();
-		}
-		if ($fullId === null && $expirationDate === null && $defaultExpireDate) {
-			$expirationDate = new \DateTime();
-			$expirationDate->setTime(0, 0, 0);
-
-			$days = (int)$this->config->getAppValue('core', $configProp, (string)$defaultExpireDays);
-			if ($days > $defaultExpireDays) {
-				$days = $defaultExpireDays;
-			}
-			$expirationDate->add(new \DateInterval('P' . $days . 'D'));
-		}
-
-		// If we enforce the expiration date check that is does not exceed
-		if ($isEnforced) {
-			if ($expirationDate === null) {
-				throw new \InvalidArgumentException('Expiration date is enforced');
-			}
-
-			$date = new \DateTime();
-			$date->setTime(0, 0, 0);
-			$date->add(new \DateInterval('P' . $defaultExpireDays . 'D'));
-			if ($date < $expirationDate) {
-				$message = $this->l->n('Cannot set expiration date more than %n day in the future', 'Cannot set expiration date more than %n days in the future', $defaultExpireDays);
-				throw new GenericShareException($message, $message, 404);
-			}
-		}
-
-		$accepted = true;
-		$message = '';
-		\OCP\Util::emitHook('\OC\Share', 'verifyExpirationDate', [
-			'expirationDate' => &$expirationDate,
-			'accepted' => &$accepted,
-			'message' => &$message,
-			'passwordSet' => $share->getPassword() !== null,
-		]);
-
-		if (!$accepted) {
-			throw new \Exception($message);
-		}
-
-		$share->setExpirationDate($expirationDate);
-
-		return $share;
-	}
-
-	/**
-	 * Validate if the expiration date fits the system settings
-	 *
-	 * @param IShare $share The share to validate the expiration date of
-	 * @return IShare The modified share object
-	 * @throws GenericShareException
-	 * @throws \InvalidArgumentException
-	 * @throws \Exception
-	 */
-	protected function validateExpirationDateLink(IShare $share) {
-		$expirationDate = $share->getExpirationDate();
-
-		if ($expirationDate !== null) {
-			//Make sure the expiration date is a date
-			$expirationDate->setTime(0, 0, 0);
-
-			$date = new \DateTime();
-			$date->setTime(0, 0, 0);
-			if ($date >= $expirationDate) {
-				$message = $this->l->t('Expiration date is in the past');
-				throw new GenericShareException($message, $message, 404);
-			}
-		}
-
-		// If expiredate is empty set a default one if there is a default
-		$fullId = null;
-		try {
-			$fullId = $share->getFullId();
-		} catch (\UnexpectedValueException $e) {
-			// This is a new share
-		}
-
-		if ($fullId === null && $expirationDate === null && $this->shareApiLinkDefaultExpireDate()) {
-			$expirationDate = new \DateTime();
-			$expirationDate->setTime(0, 0, 0);
-
-			$days = (int)$this->config->getAppValue('core', 'link_defaultExpDays', $this->shareApiLinkDefaultExpireDays());
-			if ($days > $this->shareApiLinkDefaultExpireDays()) {
-				$days = $this->shareApiLinkDefaultExpireDays();
-			}
-			$expirationDate->add(new \DateInterval('P' . $days . 'D'));
-		}
-
-		// If we enforce the expiration date check that is does not exceed
-		if ($this->shareApiLinkDefaultExpireDateEnforced()) {
-			if ($expirationDate === null) {
-				throw new \InvalidArgumentException('Expiration date is enforced');
-			}
-
-			$date = new \DateTime();
-			$date->setTime(0, 0, 0);
-			$date->add(new \DateInterval('P' . $this->shareApiLinkDefaultExpireDays() . 'D'));
-			if ($date < $expirationDate) {
-				$message = $this->l->n('Cannot set expiration date more than %n day in the future', 'Cannot set expiration date more than %n days in the future', $this->shareApiLinkDefaultExpireDays());
-				throw new GenericShareException($message, $message, 404);
-			}
-		}
-
-		$accepted = true;
-		$message = '';
-		\OCP\Util::emitHook('\OC\Share', 'verifyExpirationDate', [
-			'expirationDate' => &$expirationDate,
-			'accepted' => &$accepted,
-			'message' => &$message,
-			'passwordSet' => $share->getPassword() !== null,
-		]);
-
-		if (!$accepted) {
-			throw new \Exception($message);
-		}
-
-		$share->setExpirationDate($expirationDate);
-
-		return $share;
-	}
-
-	/**
-	 * Check for pre share requirements for user shares
-	 *
-	 * @param IShare $share
-	 * @throws \Exception
-	 */
-	protected function userCreateChecks(IShare $share) {
-		// Check if we can share with group members only
-		if ($this->shareWithGroupMembersOnly()) {
-			$sharedBy = $this->userManager->get($share->getSharedBy());
-			$sharedWith = $this->userManager->get($share->getSharedWith());
-			// Verify we can share with this user
-			$groups = array_intersect(
-				$this->groupManager->getUserGroupIds($sharedBy),
-				$this->groupManager->getUserGroupIds($sharedWith)
-			);
-			if (empty($groups)) {
-				$message_t = $this->l->t('Sharing is only allowed with group members');
-				throw new \Exception($message_t);
-			}
-		}
-
-		/*
+            $permissions = $share->getNode()->getPermissions();
+            if (!($share->getNode()->getMountPoint() instanceof MoveableMount)) {
+                $permissions |= \OCP\Constants::PERMISSION_DELETE | \OCP\Constants::PERMISSION_UPDATE;
+            }
+        }
+
+        // Check that we do not share with more permissions than we have
+        if ($share->getPermissions() & ~$permissions) {
+            $path = $userFolder->getRelativePath($share->getNode()->getPath());
+            $message_t = $this->l->t('Cannot increase permissions of %s', [$path]);
+            throw new GenericShareException($message_t, $message_t, 404);
+        }
+
+
+        // Check that read permissions are always set
+        // Link shares are allowed to have no read permissions to allow upload to hidden folders
+        $noReadPermissionRequired = $share->getShareType() === IShare::TYPE_LINK
+            || $share->getShareType() === IShare::TYPE_EMAIL;
+        if (!$noReadPermissionRequired &&
+            ($share->getPermissions() & \OCP\Constants::PERMISSION_READ) === 0) {
+            throw new \InvalidArgumentException('Shares need at least read permissions');
+        }
+
+        if ($share->getNode() instanceof \OCP\Files\File) {
+            if ($share->getPermissions() & \OCP\Constants::PERMISSION_DELETE) {
+                $message_t = $this->l->t('Files cannot be shared with delete permissions');
+                throw new GenericShareException($message_t);
+            }
+            if ($share->getPermissions() & \OCP\Constants::PERMISSION_CREATE) {
+                $message_t = $this->l->t('Files cannot be shared with create permissions');
+                throw new GenericShareException($message_t);
+            }
+        }
+    }
+
+    /**
+     * Validate if the expiration date fits the system settings
+     *
+     * @param IShare $share The share to validate the expiration date of
+     * @return IShare The modified share object
+     * @throws GenericShareException
+     * @throws \InvalidArgumentException
+     * @throws \Exception
+     */
+    protected function validateExpirationDateInternal(IShare $share) {
+        $isRemote = $share->getShareType() === IShare::TYPE_REMOTE || $share->getShareType() === IShare::TYPE_REMOTE_GROUP;
+
+        $expirationDate = $share->getExpirationDate();
+
+        if ($expirationDate !== null) {
+            //Make sure the expiration date is a date
+            $expirationDate->setTime(0, 0, 0);
+
+            $date = new \DateTime();
+            $date->setTime(0, 0, 0);
+            if ($date >= $expirationDate) {
+                $message = $this->l->t('Expiration date is in the past');
+                throw new GenericShareException($message, $message, 404);
+            }
+        }
+
+        // If expiredate is empty set a default one if there is a default
+        $fullId = null;
+        try {
+            $fullId = $share->getFullId();
+        } catch (\UnexpectedValueException $e) {
+            // This is a new share
+        }
+
+        if ($isRemote) {
+            $defaultExpireDate = $this->shareApiRemoteDefaultExpireDate();
+            $defaultExpireDays = $this->shareApiRemoteDefaultExpireDays();
+            $configProp = 'remote_defaultExpDays';
+            $isEnforced = $this->shareApiRemoteDefaultExpireDateEnforced();
+        } else {
+            $defaultExpireDate = $this->shareApiInternalDefaultExpireDate();
+            $defaultExpireDays = $this->shareApiInternalDefaultExpireDays();
+            $configProp = 'internal_defaultExpDays';
+            $isEnforced = $this->shareApiInternalDefaultExpireDateEnforced();
+        }
+        if ($fullId === null && $expirationDate === null && $defaultExpireDate) {
+            $expirationDate = new \DateTime();
+            $expirationDate->setTime(0, 0, 0);
+
+            $days = (int)$this->config->getAppValue('core', $configProp, (string)$defaultExpireDays);
+            if ($days > $defaultExpireDays) {
+                $days = $defaultExpireDays;
+            }
+            $expirationDate->add(new \DateInterval('P' . $days . 'D'));
+        }
+
+        // If we enforce the expiration date check that is does not exceed
+        if ($isEnforced) {
+            if ($expirationDate === null) {
+                throw new \InvalidArgumentException('Expiration date is enforced');
+            }
+
+            $date = new \DateTime();
+            $date->setTime(0, 0, 0);
+            $date->add(new \DateInterval('P' . $defaultExpireDays . 'D'));
+            if ($date < $expirationDate) {
+                $message = $this->l->n('Cannot set expiration date more than %n day in the future', 'Cannot set expiration date more than %n days in the future', $defaultExpireDays);
+                throw new GenericShareException($message, $message, 404);
+            }
+        }
+
+        $accepted = true;
+        $message = '';
+        \OCP\Util::emitHook('\OC\Share', 'verifyExpirationDate', [
+            'expirationDate' => &$expirationDate,
+            'accepted' => &$accepted,
+            'message' => &$message,
+            'passwordSet' => $share->getPassword() !== null,
+        ]);
+
+        if (!$accepted) {
+            throw new \Exception($message);
+        }
+
+        $share->setExpirationDate($expirationDate);
+
+        return $share;
+    }
+
+    /**
+     * Validate if the expiration date fits the system settings
+     *
+     * @param IShare $share The share to validate the expiration date of
+     * @return IShare The modified share object
+     * @throws GenericShareException
+     * @throws \InvalidArgumentException
+     * @throws \Exception
+     */
+    protected function validateExpirationDateLink(IShare $share) {
+        $expirationDate = $share->getExpirationDate();
+
+        if ($expirationDate !== null) {
+            //Make sure the expiration date is a date
+            $expirationDate->setTime(0, 0, 0);
+
+            $date = new \DateTime();
+            $date->setTime(0, 0, 0);
+            if ($date >= $expirationDate) {
+                $message = $this->l->t('Expiration date is in the past');
+                throw new GenericShareException($message, $message, 404);
+            }
+        }
+
+        // If expiredate is empty set a default one if there is a default
+        $fullId = null;
+        try {
+            $fullId = $share->getFullId();
+        } catch (\UnexpectedValueException $e) {
+            // This is a new share
+        }
+
+        if ($fullId === null && $expirationDate === null && $this->shareApiLinkDefaultExpireDate()) {
+            $expirationDate = new \DateTime();
+            $expirationDate->setTime(0, 0, 0);
+
+            $days = (int)$this->config->getAppValue('core', 'link_defaultExpDays', $this->shareApiLinkDefaultExpireDays());
+            if ($days > $this->shareApiLinkDefaultExpireDays()) {
+                $days = $this->shareApiLinkDefaultExpireDays();
+            }
+            $expirationDate->add(new \DateInterval('P' . $days . 'D'));
+        }
+
+        // If we enforce the expiration date check that is does not exceed
+        if ($this->shareApiLinkDefaultExpireDateEnforced()) {
+            if ($expirationDate === null) {
+                throw new \InvalidArgumentException('Expiration date is enforced');
+            }
+
+            $date = new \DateTime();
+            $date->setTime(0, 0, 0);
+            $date->add(new \DateInterval('P' . $this->shareApiLinkDefaultExpireDays() . 'D'));
+            if ($date < $expirationDate) {
+                $message = $this->l->n('Cannot set expiration date more than %n day in the future', 'Cannot set expiration date more than %n days in the future', $this->shareApiLinkDefaultExpireDays());
+                throw new GenericShareException($message, $message, 404);
+            }
+        }
+
+        $accepted = true;
+        $message = '';
+        \OCP\Util::emitHook('\OC\Share', 'verifyExpirationDate', [
+            'expirationDate' => &$expirationDate,
+            'accepted' => &$accepted,
+            'message' => &$message,
+            'passwordSet' => $share->getPassword() !== null,
+        ]);
+
+        if (!$accepted) {
+            throw new \Exception($message);
+        }
+
+        $share->setExpirationDate($expirationDate);
+
+        return $share;
+    }
+
+    /**
+     * Check for pre share requirements for user shares
+     *
+     * @param IShare $share
+     * @throws \Exception
+     */
+    protected function userCreateChecks(IShare $share) {
+        // Check if we can share with group members only
+        if ($this->shareWithGroupMembersOnly()) {
+            $sharedBy = $this->userManager->get($share->getSharedBy());
+            $sharedWith = $this->userManager->get($share->getSharedWith());
+            // Verify we can share with this user
+            $groups = array_intersect(
+                $this->groupManager->getUserGroupIds($sharedBy),
+                $this->groupManager->getUserGroupIds($sharedWith)
+            );
+            if (empty($groups)) {
+                $message_t = $this->l->t('Sharing is only allowed with group members');
+                throw new \Exception($message_t);
+            }
+        }
+
+        /*
 		 * TODO: Could be costly, fix
 		 *
 		 * Also this is not what we want in the future.. then we want to squash identical shares.
 		 */
-		$provider = $this->factory->getProviderForType(IShare::TYPE_USER);
-		$existingShares = $provider->getSharesByPath($share->getNode());
-		foreach ($existingShares as $existingShare) {
-			// Ignore if it is the same share
-			try {
-				if ($existingShare->getFullId() === $share->getFullId()) {
-					continue;
-				}
-			} catch (\UnexpectedValueException $e) {
-				//Shares are not identical
-			}
-
-			// Identical share already exists
-			if ($existingShare->getSharedWith() === $share->getSharedWith() && $existingShare->getShareType() === $share->getShareType()) {
-				$message = $this->l->t('Sharing %s failed, because this item is already shared with user %s', [$share->getNode()->getName(), $share->getSharedWithDisplayName()]);
-				throw new AlreadySharedException($message, $existingShare);
-			}
-
-			// The share is already shared with this user via a group share
-			if ($existingShare->getShareType() === IShare::TYPE_GROUP) {
-				$group = $this->groupManager->get($existingShare->getSharedWith());
-				if (!is_null($group)) {
-					$user = $this->userManager->get($share->getSharedWith());
-
-					if ($group->inGroup($user) && $existingShare->getShareOwner() !== $share->getShareOwner()) {
-						$message = $this->l->t('Sharing %s failed, because this item is already shared with user %s', [$share->getNode()->getName(), $share->getSharedWithDisplayName()]);
-						throw new AlreadySharedException($message, $existingShare);
-					}
-				}
-			}
-		}
-	}
-
-	/**
-	 * Check for pre share requirements for group shares
-	 *
-	 * @param IShare $share
-	 * @throws \Exception
-	 */
-	protected function groupCreateChecks(IShare $share) {
-		// Verify group shares are allowed
-		if (!$this->allowGroupSharing()) {
-			throw new \Exception('Group sharing is now allowed');
-		}
-
-		// Verify if the user can share with this group
-		if ($this->shareWithGroupMembersOnly()) {
-			$sharedBy = $this->userManager->get($share->getSharedBy());
-			$sharedWith = $this->groupManager->get($share->getSharedWith());
-			if (is_null($sharedWith) || !$sharedWith->inGroup($sharedBy)) {
-				throw new \Exception('Sharing is only allowed within your own groups');
-			}
-		}
-
-		/*
+        $provider = $this->factory->getProviderForType(IShare::TYPE_USER);
+        $existingShares = $provider->getSharesByPath($share->getNode());
+        foreach ($existingShares as $existingShare) {
+            // Ignore if it is the same share
+            try {
+                if ($existingShare->getFullId() === $share->getFullId()) {
+                    continue;
+                }
+            } catch (\UnexpectedValueException $e) {
+                //Shares are not identical
+            }
+
+            // Identical share already exists
+            if ($existingShare->getSharedWith() === $share->getSharedWith() && $existingShare->getShareType() === $share->getShareType()) {
+                $message = $this->l->t('Sharing %s failed, because this item is already shared with user %s', [$share->getNode()->getName(), $share->getSharedWithDisplayName()]);
+                throw new AlreadySharedException($message, $existingShare);
+            }
+
+            // The share is already shared with this user via a group share
+            if ($existingShare->getShareType() === IShare::TYPE_GROUP) {
+                $group = $this->groupManager->get($existingShare->getSharedWith());
+                if (!is_null($group)) {
+                    $user = $this->userManager->get($share->getSharedWith());
+
+                    if ($group->inGroup($user) && $existingShare->getShareOwner() !== $share->getShareOwner()) {
+                        $message = $this->l->t('Sharing %s failed, because this item is already shared with user %s', [$share->getNode()->getName(), $share->getSharedWithDisplayName()]);
+                        throw new AlreadySharedException($message, $existingShare);
+                    }
+                }
+            }
+        }
+    }
+
+    /**
+     * Check for pre share requirements for group shares
+     *
+     * @param IShare $share
+     * @throws \Exception
+     */
+    protected function groupCreateChecks(IShare $share) {
+        // Verify group shares are allowed
+        if (!$this->allowGroupSharing()) {
+            throw new \Exception('Group sharing is now allowed');
+        }
+
+        // Verify if the user can share with this group
+        if ($this->shareWithGroupMembersOnly()) {
+            $sharedBy = $this->userManager->get($share->getSharedBy());
+            $sharedWith = $this->groupManager->get($share->getSharedWith());
+            if (is_null($sharedWith) || !$sharedWith->inGroup($sharedBy)) {
+                throw new \Exception('Sharing is only allowed within your own groups');
+            }
+        }
+
+        /*
 		 * TODO: Could be costly, fix
 		 *
 		 * Also this is not what we want in the future.. then we want to squash identical shares.
 		 */
-		$provider = $this->factory->getProviderForType(IShare::TYPE_GROUP);
-		$existingShares = $provider->getSharesByPath($share->getNode());
-		foreach ($existingShares as $existingShare) {
-			try {
-				if ($existingShare->getFullId() === $share->getFullId()) {
-					continue;
-				}
-			} catch (\UnexpectedValueException $e) {
-				//It is a new share so just continue
-			}
-
-			if ($existingShare->getSharedWith() === $share->getSharedWith() && $existingShare->getShareType() === $share->getShareType()) {
-				throw new AlreadySharedException('Path is already shared with this group', $existingShare);
-			}
-		}
-	}
-
-	/**
-	 * Check for pre share requirements for link shares
-	 *
-	 * @param IShare $share
-	 * @throws \Exception
-	 */
-	protected function linkCreateChecks(IShare $share) {
-		// Are link shares allowed?
-		if (!$this->shareApiAllowLinks()) {
-			throw new \Exception('Link sharing is not allowed');
-		}
-
-		// Check if public upload is allowed
-		if ($share->getNodeType() === 'folder' && !$this->shareApiLinkAllowPublicUpload() &&
-			($share->getPermissions() & (\OCP\Constants::PERMISSION_CREATE | \OCP\Constants::PERMISSION_UPDATE | \OCP\Constants::PERMISSION_DELETE))) {
-			throw new \InvalidArgumentException('Public upload is not allowed');
-		}
-	}
-
-	/**
-	 * To make sure we don't get invisible link shares we set the parent
-	 * of a link if it is a reshare. This is a quick word around
-	 * until we can properly display multiple link shares in the UI
-	 *
-	 * See: https://github.com/owncloud/core/issues/22295
-	 *
-	 * FIXME: Remove once multiple link shares can be properly displayed
-	 *
-	 * @param IShare $share
-	 */
-	protected function setLinkParent(IShare $share) {
-		// No sense in checking if the method is not there.
-		if (method_exists($share, 'setParent')) {
-			$storage = $share->getNode()->getStorage();
-			if ($storage->instanceOfStorage('\OCA\Files_Sharing\ISharedStorage')) {
-				/** @var \OCA\Files_Sharing\SharedStorage $storage */
-				$share->setParent($storage->getShareId());
-			}
-		}
-	}
-
-	/**
-	 * @param File|Folder $path
-	 */
-	protected function pathCreateChecks($path) {
-		// Make sure that we do not share a path that contains a shared mountpoint
-		if ($path instanceof \OCP\Files\Folder) {
-			$mounts = $this->mountManager->findIn($path->getPath());
-			foreach ($mounts as $mount) {
-				if ($mount->getStorage()->instanceOfStorage('\OCA\Files_Sharing\ISharedStorage')) {
-					throw new \InvalidArgumentException('Path contains files shared with you');
-				}
-			}
-		}
-	}
-
-	/**
-	 * Check if the user that is sharing can actually share
-	 *
-	 * @param IShare $share
-	 * @throws \Exception
-	 */
-	protected function canShare(IShare $share) {
-		if (!$this->shareApiEnabled()) {
-			throw new \Exception('Sharing is disabled');
-		}
-
-		if ($this->sharingDisabledForUser($share->getSharedBy())) {
-			throw new \Exception('Sharing is disabled for you');
-		}
-	}
-
-	/**
-	 * Share a path
-	 *
-	 * @param IShare $share
-	 * @return IShare The share object
-	 * @throws \Exception
-	 *
-	 * TODO: handle link share permissions or check them
-	 */
-	public function createShare(IShare $share) {
-		$this->canShare($share);
-
-		$this->generalCreateChecks($share);
-
-		// Verify if there are any issues with the path
-		$this->pathCreateChecks($share->getNode());
-
-		/*
+        $provider = $this->factory->getProviderForType(IShare::TYPE_GROUP);
+        $existingShares = $provider->getSharesByPath($share->getNode());
+        foreach ($existingShares as $existingShare) {
+            try {
+                if ($existingShare->getFullId() === $share->getFullId()) {
+                    continue;
+                }
+            } catch (\UnexpectedValueException $e) {
+                //It is a new share so just continue
+            }
+
+            if ($existingShare->getSharedWith() === $share->getSharedWith() && $existingShare->getShareType() === $share->getShareType()) {
+                throw new AlreadySharedException('Path is already shared with this group', $existingShare);
+            }
+        }
+    }
+
+    /**
+     * Check for pre share requirements for link shares
+     *
+     * @param IShare $share
+     * @throws \Exception
+     */
+    protected function linkCreateChecks(IShare $share) {
+        // Are link shares allowed?
+        if (!$this->shareApiAllowLinks()) {
+            throw new \Exception('Link sharing is not allowed');
+        }
+
+        // Check if public upload is allowed
+        if ($share->getNodeType() === 'folder' && !$this->shareApiLinkAllowPublicUpload() &&
+            ($share->getPermissions() & (\OCP\Constants::PERMISSION_CREATE | \OCP\Constants::PERMISSION_UPDATE | \OCP\Constants::PERMISSION_DELETE))) {
+            throw new \InvalidArgumentException('Public upload is not allowed');
+        }
+    }
+
+    /**
+     * To make sure we don't get invisible link shares we set the parent
+     * of a link if it is a reshare. This is a quick word around
+     * until we can properly display multiple link shares in the UI
+     *
+     * See: https://github.com/owncloud/core/issues/22295
+     *
+     * FIXME: Remove once multiple link shares can be properly displayed
+     *
+     * @param IShare $share
+     */
+    protected function setLinkParent(IShare $share) {
+        // No sense in checking if the method is not there.
+        if (method_exists($share, 'setParent')) {
+            $storage = $share->getNode()->getStorage();
+            if ($storage->instanceOfStorage('\OCA\Files_Sharing\ISharedStorage')) {
+                /** @var \OCA\Files_Sharing\SharedStorage $storage */
+                $share->setParent($storage->getShareId());
+            }
+        }
+    }
+
+    /**
+     * @param File|Folder $path
+     */
+    protected function pathCreateChecks($path) {
+        // Make sure that we do not share a path that contains a shared mountpoint
+        if ($path instanceof \OCP\Files\Folder) {
+            $mounts = $this->mountManager->findIn($path->getPath());
+            foreach ($mounts as $mount) {
+                if ($mount->getStorage()->instanceOfStorage('\OCA\Files_Sharing\ISharedStorage')) {
+                    throw new \InvalidArgumentException('Path contains files shared with you');
+                }
+            }
+        }
+    }
+
+    /**
+     * Check if the user that is sharing can actually share
+     *
+     * @param IShare $share
+     * @throws \Exception
+     */
+    protected function canShare(IShare $share) {
+        if (!$this->shareApiEnabled()) {
+            throw new \Exception('Sharing is disabled');
+        }
+
+        if ($this->sharingDisabledForUser($share->getSharedBy())) {
+            throw new \Exception('Sharing is disabled for you');
+        }
+    }
+
+    /**
+     * Share a path
+     *
+     * @param IShare $share
+     * @return IShare The share object
+     * @throws \Exception
+     *
+     * TODO: handle link share permissions or check them
+     */
+    public function createShare(IShare $share) {
+        $this->canShare($share);
+
+        $this->generalCreateChecks($share);
+
+        // Verify if there are any issues with the path
+        $this->pathCreateChecks($share->getNode());
+
+        /*
 		 * On creation of a share the owner is always the owner of the path
 		 * Except for mounted federated shares.
 		 */
-		$storage = $share->getNode()->getStorage();
-		if ($storage->instanceOfStorage('OCA\Files_Sharing\External\Storage')) {
-			$parent = $share->getNode()->getParent();
-			while ($parent->getStorage()->instanceOfStorage('OCA\Files_Sharing\External\Storage')) {
-				$parent = $parent->getParent();
-			}
-			$share->setShareOwner($parent->getOwner()->getUID());
-		} else {
-			if ($share->getNode()->getOwner()) {
-				$share->setShareOwner($share->getNode()->getOwner()->getUID());
-			} else {
-				$share->setShareOwner($share->getSharedBy());
-			}
-		}
-
-		try {
-			// Verify share type
-			if ($share->getShareType() === IShare::TYPE_USER) {
-				$this->userCreateChecks($share);
-
-				// Verify the expiration date
-				$share = $this->validateExpirationDateInternal($share);
-			} elseif ($share->getShareType() === IShare::TYPE_GROUP) {
-				$this->groupCreateChecks($share);
-
-				// Verify the expiration date
-				$share = $this->validateExpirationDateInternal($share);
-			} elseif ($share->getShareType() === IShare::TYPE_REMOTE || $share->getShareType() === IShare::TYPE_REMOTE_GROUP) {
-				//Verify the expiration date
-				$share = $this->validateExpirationDateInternal($share);
-			} elseif ($share->getShareType() === IShare::TYPE_LINK
-				|| $share->getShareType() === IShare::TYPE_EMAIL) {
-				$this->linkCreateChecks($share);
-				$this->setLinkParent($share);
-
-				// For now ignore a set token.
-				$share->setToken(
-					$this->secureRandom->generate(
-						\OC\Share\Constants::TOKEN_LENGTH,
-						\OCP\Security\ISecureRandom::CHAR_HUMAN_READABLE
-					)
-				);
-
-				// Verify the expiration date
-				$share = $this->validateExpirationDateLink($share);
-
-				// Verify the password
-				$this->verifyPassword($share->getPassword());
-
-				// If a password is set. Hash it!
-				if ($share->getShareType() === IShare::TYPE_LINK
-					&& $share->getPassword() !== null) {
-					$share->setPassword($this->hasher->hash($share->getPassword()));
-				}
-			}
-
-			// Cannot share with the owner
-			if ($share->getShareType() === IShare::TYPE_USER &&
-				$share->getSharedWith() === $share->getShareOwner()) {
-				throw new \InvalidArgumentException('Cannot share with the share owner');
-			}
-
-			// Generate the target
-			$defaultShareFolder = $this->config->getSystemValue('share_folder', '/');
-			$allowCustomShareFolder = $this->config->getSystemValueBool('sharing.allow_custom_share_folder', true);
-			if ($allowCustomShareFolder) {
-				$shareFolder = $this->config->getUserValue($share->getSharedWith(), Application::APP_ID, 'share_folder', $defaultShareFolder);
-			} else {
-				$shareFolder = $defaultShareFolder;
-			}
-
-			$target = $shareFolder . '/' . $share->getNode()->getName();
-			$target = \OC\Files\Filesystem::normalizePath($target);
-			$share->setTarget($target);
-
-			// Pre share event
-			$event = new GenericEvent($share);
-			$this->legacyDispatcher->dispatch('OCP\Share::preShare', $event);
-			if ($event->isPropagationStopped() && $event->hasArgument('error')) {
-				throw new \Exception($event->getArgument('error'));
-			}
-
-			$oldShare = $share;
-			$provider = $this->factory->getProviderForType($share->getShareType());
-			$share = $provider->create($share);
-
-			// Reuse the node we already have
-			$share->setNode($oldShare->getNode());
-
-			// Reset the target if it is null for the new share
-			if ($share->getTarget() === '') {
-				$share->setTarget($target);
-			}
-		} catch (AlreadySharedException $e) {
-			// if a share for the same target already exists, dont create a new one, but do trigger the hooks and notifications again
-			$oldShare = $share;
-
-			// Reuse the node we already have
-			$share = $e->getExistingShare();
-			$share->setNode($oldShare->getNode());
-		}
-
-		// Post share event
-		$event = new GenericEvent($share);
-		$this->legacyDispatcher->dispatch('OCP\Share::postShare', $event);
-
-		$this->dispatcher->dispatchTyped(new Share\Events\ShareCreatedEvent($share));
-
-		if ($this->config->getSystemValueBool('sharing.enable_share_mail', true)
-			&& $share->getShareType() === IShare::TYPE_USER) {
-			$mailSend = $share->getMailSend();
-			if ($mailSend === true) {
-				$user = $this->userManager->get($share->getSharedWith());
-				if ($user !== null) {
-					$emailAddress = $user->getEMailAddress();
-					if ($emailAddress !== null && $emailAddress !== '') {
-						$userLang = $this->l10nFactory->getUserLanguage($user);
-						$l = $this->l10nFactory->get('lib', $userLang);
-						$this->sendMailNotification(
-							$l,
-							$share->getNode()->getName(),
-							$this->urlGenerator->linkToRouteAbsolute('files_sharing.Accept.accept', ['shareId' => $share->getFullId()]),
-							$share->getSharedBy(),
-							$emailAddress,
-							$share->getExpirationDate(),
-							$share->getNote()
-						);
-						$this->logger->debug('Sent share notification to ' . $emailAddress . ' for share with ID ' . $share->getId(), ['app' => 'share']);
-					} else {
-						$this->logger->debug('Share notification not sent to ' . $share->getSharedWith() . ' because email address is not set.', ['app' => 'share']);
-					}
-				} else {
-					$this->logger->debug('Share notification not sent to ' . $share->getSharedWith() . ' because user could not be found.', ['app' => 'share']);
-				}
-			} else {
-				$this->logger->debug('Share notification not sent because mailsend is false.', ['app' => 'share']);
-			}
-		}
-
-		return $share;
-	}
-
-	/**
-	 * Send mail notifications
-	 *
-	 * This method will catch and log mail transmission errors
-	 *
-	 * @param IL10N $l Language of the recipient
-	 * @param string $filename file/folder name
-	 * @param string $link link to the file/folder
-	 * @param string $initiator user ID of share sender
-	 * @param string $shareWith email address of share receiver
-	 * @param \DateTime|null $expiration
-	 */
-	protected function sendMailNotification(IL10N $l,
-											$filename,
-											$link,
-											$initiator,
-											$shareWith,
-											\DateTime $expiration = null,
-											$note = '') {
-		$initiatorUser = $this->userManager->get($initiator);
-		$initiatorDisplayName = ($initiatorUser instanceof IUser) ? $initiatorUser->getDisplayName() : $initiator;
-
-		$message = $this->mailer->createMessage();
-
-		$emailTemplate = $this->mailer->createEMailTemplate('files_sharing.RecipientNotification', [
-			'filename' => $filename,
-			'link' => $link,
-			'initiator' => $initiatorDisplayName,
-			'expiration' => $expiration,
-			'shareWith' => $shareWith,
-		]);
-
-		$emailTemplate->setSubject($l->t('%1$s shared »%2$s« with you', [$initiatorDisplayName, $filename]));
-		$emailTemplate->addHeader();
-		$emailTemplate->addHeading($l->t('%1$s shared »%2$s« with you', [$initiatorDisplayName, $filename]), false);
-		$text = $l->t('%1$s shared »%2$s« with you.', [$initiatorDisplayName, $filename]);
-
-		if ($note !== '') {
-			$emailTemplate->addBodyText(htmlspecialchars($note), $note);
-		}
-
-		$emailTemplate->addBodyText(
-			htmlspecialchars($text . ' ' . $l->t('Click the button below to open it.')),
-			$text
-		);
-		$emailTemplate->addBodyButton(
-			$l->t('Open »%s«', [$filename]),
-			$link
-		);
-
-		$message->setTo([$shareWith]);
-
-		// The "From" contains the sharers name
-		$instanceName = $this->defaults->getName();
-		$senderName = $l->t(
-			'%1$s via %2$s',
-			[
-				$initiatorDisplayName,
-				$instanceName,
-			]
-		);
-		$message->setFrom([\OCP\Util::getDefaultEmailAddress('noreply') => $senderName]);
-
-		// The "Reply-To" is set to the sharer if an mail address is configured
-		// also the default footer contains a "Do not reply" which needs to be adjusted.
-		$initiatorEmail = $initiatorUser->getEMailAddress();
-		if ($initiatorEmail !== null) {
-			$message->setReplyTo([$initiatorEmail => $initiatorDisplayName]);
-			$emailTemplate->addFooter($instanceName . ($this->defaults->getSlogan($l->getLanguageCode()) !== '' ? ' - ' . $this->defaults->getSlogan($l->getLanguageCode()) : ''));
-		} else {
-			$emailTemplate->addFooter('', $l->getLanguageCode());
-		}
-
-		$message->useTemplate($emailTemplate);
-		try {
-			$failedRecipients = $this->mailer->send($message);
-			if (!empty($failedRecipients)) {
-				$this->logger->error('Share notification mail could not be sent to: ' . implode(', ', $failedRecipients));
-				return;
-			}
-		} catch (\Exception $e) {
-			$this->logger->error('Share notification mail could not be sent', ['exception' => $e]);
-		}
-	}
-
-	/**
-	 * Update a share
-	 *
-	 * @param IShare $share
-	 * @return IShare The share object
-	 * @throws \InvalidArgumentException
-	 */
-	public function updateShare(IShare $share) {
-		$expirationDateUpdated = false;
-
-		$this->canShare($share);
-
-		try {
-			$originalShare = $this->getShareById($share->getFullId());
-		} catch (\UnexpectedValueException $e) {
-			throw new \InvalidArgumentException('Share does not have a full id');
-		}
-
-		// We cannot change the share type!
-		if ($share->getShareType() !== $originalShare->getShareType()) {
-			throw new \InvalidArgumentException('Cannot change share type');
-		}
-
-		// We can only change the recipient on user shares
-		if ($share->getSharedWith() !== $originalShare->getSharedWith() &&
-			$share->getShareType() !== IShare::TYPE_USER) {
-			throw new \InvalidArgumentException('Can only update recipient on user shares');
-		}
-
-		// Cannot share with the owner
-		if ($share->getShareType() === IShare::TYPE_USER &&
-			$share->getSharedWith() === $share->getShareOwner()) {
-			throw new \InvalidArgumentException('Cannot share with the share owner');
-		}
-
-		$this->generalCreateChecks($share);
-
-		if ($share->getShareType() === IShare::TYPE_USER) {
-			$this->userCreateChecks($share);
-
-			if ($share->getExpirationDate() != $originalShare->getExpirationDate()) {
-				//Verify the expiration date
-				$this->validateExpirationDateInternal($share);
-				$expirationDateUpdated = true;
-			}
-		} elseif ($share->getShareType() === IShare::TYPE_GROUP) {
-			$this->groupCreateChecks($share);
-
-			if ($share->getExpirationDate() != $originalShare->getExpirationDate()) {
-				//Verify the expiration date
-				$this->validateExpirationDateInternal($share);
-				$expirationDateUpdated = true;
-			}
-		} elseif ($share->getShareType() === IShare::TYPE_LINK
-			|| $share->getShareType() === IShare::TYPE_EMAIL) {
-			$this->linkCreateChecks($share);
-
-			// The new password is not set again if it is the same as the old
-			// one, unless when switching from sending by Talk to sending by
-			// mail.
-			$plainTextPassword = $share->getPassword();
-			$updatedPassword = $this->updateSharePasswordIfNeeded($share, $originalShare);
-
-			/**
-			 * Cannot enable the getSendPasswordByTalk if there is no password set
-			 */
-			if (empty($plainTextPassword) && $share->getSendPasswordByTalk()) {
-				throw new \InvalidArgumentException('Cannot enable sending the password by Talk with an empty password');
-			}
-
-			/**
-			 * If we're in a mail share, we need to force a password change
-			 * as either the user is not aware of the password or is already (received by mail)
-			 * Thus the SendPasswordByTalk feature would not make sense
-			 */
-			if (!$updatedPassword && $share->getShareType() === IShare::TYPE_EMAIL) {
-				if (!$originalShare->getSendPasswordByTalk() && $share->getSendPasswordByTalk()) {
-					throw new \InvalidArgumentException('Cannot enable sending the password by Talk without setting a new password');
-				}
-				if ($originalShare->getSendPasswordByTalk() && !$share->getSendPasswordByTalk()) {
-					throw new \InvalidArgumentException('Cannot disable sending the password by Talk without setting a new password');
-				}
-			}
-
-			if ($share->getExpirationDate() != $originalShare->getExpirationDate()) {
-				// Verify the expiration date
-				$this->validateExpirationDateLink($share);
-				$expirationDateUpdated = true;
-			}
-		} elseif ($share->getShareType() === IShare::TYPE_REMOTE || $share->getShareType() === IShare::TYPE_REMOTE_GROUP) {
-			if ($share->getExpirationDate() != $originalShare->getExpirationDate()) {
-				//Verify the expiration date
-				$this->validateExpirationDateInternal($share);
-				$expirationDateUpdated = true;
-			}
-		}
-
-		$this->pathCreateChecks($share->getNode());
-
-		// Now update the share!
-		$provider = $this->factory->getProviderForType($share->getShareType());
-		if ($share->getShareType() === IShare::TYPE_EMAIL) {
-			$share = $provider->update($share, $plainTextPassword);
-		} else {
-			$share = $provider->update($share);
-		}
-
-		if ($expirationDateUpdated === true) {
-			\OC_Hook::emit(Share::class, 'post_set_expiration_date', [
-				'itemType' => $share->getNode() instanceof \OCP\Files\File ? 'file' : 'folder',
-				'itemSource' => $share->getNode()->getId(),
-				'date' => $share->getExpirationDate(),
-				'uidOwner' => $share->getSharedBy(),
-			]);
-		}
-
-		if ($share->getPassword() !== $originalShare->getPassword()) {
-			\OC_Hook::emit(Share::class, 'post_update_password', [
-				'itemType' => $share->getNode() instanceof \OCP\Files\File ? 'file' : 'folder',
-				'itemSource' => $share->getNode()->getId(),
-				'uidOwner' => $share->getSharedBy(),
-				'token' => $share->getToken(),
-				'disabled' => is_null($share->getPassword()),
-			]);
-		}
-
-		if ($share->getPermissions() !== $originalShare->getPermissions()) {
-			if ($this->userManager->userExists($share->getShareOwner())) {
-				$userFolder = $this->rootFolder->getUserFolder($share->getShareOwner());
-			} else {
-				$userFolder = $this->rootFolder->getUserFolder($share->getSharedBy());
-			}
-			\OC_Hook::emit(Share::class, 'post_update_permissions', [
-				'itemType' => $share->getNode() instanceof \OCP\Files\File ? 'file' : 'folder',
-				'itemSource' => $share->getNode()->getId(),
-				'shareType' => $share->getShareType(),
-				'shareWith' => $share->getSharedWith(),
-				'uidOwner' => $share->getSharedBy(),
-				'permissions' => $share->getPermissions(),
-				'attributes' => $share->getAttributes() !== null ? $share->getAttributes()->toArray() : null,
-				'path' => $userFolder->getRelativePath($share->getNode()->getPath()),
-			]);
-		}
-
-		return $share;
-	}
-
-	/**
-	 * Accept a share.
-	 *
-	 * @param IShare $share
-	 * @param string $recipientId
-	 * @return IShare The share object
-	 * @throws \InvalidArgumentException
-	 * @since 9.0.0
-	 */
-	public function acceptShare(IShare $share, string $recipientId): IShare {
-		[$providerId,] = $this->splitFullId($share->getFullId());
-		$provider = $this->factory->getProvider($providerId);
-
-		if (!method_exists($provider, 'acceptShare')) {
-			// TODO FIX ME
-			throw new \InvalidArgumentException('Share provider does not support accepting');
-		}
-		$provider->acceptShare($share, $recipientId);
-		$event = new GenericEvent($share);
-		$this->legacyDispatcher->dispatch('OCP\Share::postAcceptShare', $event);
-
-		return $share;
-	}
-
-	/**
-	 * Updates the password of the given share if it is not the same as the
-	 * password of the original share.
-	 *
-	 * @param IShare $share the share to update its password.
-	 * @param IShare $originalShare the original share to compare its
-	 *        password with.
-	 * @return boolean whether the password was updated or not.
-	 */
-	private function updateSharePasswordIfNeeded(IShare $share, IShare $originalShare) {
-		$passwordsAreDifferent = ($share->getPassword() !== $originalShare->getPassword()) &&
-			(($share->getPassword() !== null && $originalShare->getPassword() === null) ||
-				($share->getPassword() === null && $originalShare->getPassword() !== null) ||
-				($share->getPassword() !== null && $originalShare->getPassword() !== null &&
-					!$this->hasher->verify($share->getPassword(), $originalShare->getPassword())));
-
-		// Password updated.
-		if ($passwordsAreDifferent) {
-			//Verify the password
-			$this->verifyPassword($share->getPassword());
-
-			// If a password is set. Hash it!
-			if (!empty($share->getPassword())) {
-				$share->setPassword($this->hasher->hash($share->getPassword()));
-				if ($share->getShareType() === IShare::TYPE_EMAIL) {
-					// Shares shared by email have temporary passwords
-					$this->setSharePasswordExpirationTime($share);
-				}
-
-				return true;
-			} else {
-				// Empty string and null are seen as NOT password protected
-				$share->setPassword(null);
-				if ($share->getShareType() === IShare::TYPE_EMAIL) {
-					$share->setPasswordExpirationTime(null);
-				}
-				return true;
-			}
-		} else {
-			// Reset the password to the original one, as it is either the same
-			// as the "new" password or a hashed version of it.
-			$share->setPassword($originalShare->getPassword());
-		}
-
-		return false;
-	}
-
-	/**
-	 * Set the share's password expiration time
-	 */
-	private function setSharePasswordExpirationTime(IShare $share): void {
-		if (!$this->config->getSystemValue('sharing.enable_mail_link_password_expiration', false)) {
-			// Sets password expiration date to NULL
-			$share->setPasswordExpirationTime();
-			return;
-		}
-		// Sets password expiration date
-		$expirationTime = null;
-		$now = new \DateTime();
-		$expirationInterval = $this->config->getSystemValue('sharing.mail_link_password_expiration_interval', 3600);
-		$expirationTime = $now->add(new \DateInterval('PT' . $expirationInterval . 'S'));
-		$share->setPasswordExpirationTime($expirationTime);
-	}
-
-
-	/**
-	 * Delete all the children of this share
-	 * FIXME: remove once https://github.com/owncloud/core/pull/21660 is in
-	 *
-	 * @param IShare $share
-	 * @return IShare[] List of deleted shares
-	 */
-	protected function deleteChildren(IShare $share) {
-		$deletedShares = [];
-
-		$provider = $this->factory->getProviderForType($share->getShareType());
-
-		foreach ($provider->getChildren($share) as $child) {
-			$deletedChildren = $this->deleteChildren($child);
-			$deletedShares = array_merge($deletedShares, $deletedChildren);
-
-			$provider->delete($child);
-			$this->dispatcher->dispatchTyped(new Share\Events\ShareDeletedEvent($child));
-			$deletedShares[] = $child;
-		}
-
-		return $deletedShares;
-	}
-
-	/**
-	 * Delete a share
-	 *
-	 * @param IShare $share
-	 * @throws ShareNotFound
-	 * @throws \InvalidArgumentException
-	 */
-	public function deleteShare(IShare $share) {
-		try {
-			$share->getFullId();
-		} catch (\UnexpectedValueException $e) {
-			throw new \InvalidArgumentException('Share does not have a full id');
-		}
-
-		$event = new GenericEvent($share);
-		$this->legacyDispatcher->dispatch('OCP\Share::preUnshare', $event);
-
-		// Get all children and delete them as well
-		$deletedShares = $this->deleteChildren($share);
-
-		// Do the actual delete
-		$provider = $this->factory->getProviderForType($share->getShareType());
-		$provider->delete($share);
-
-		$this->dispatcher->dispatchTyped(new Share\Events\ShareDeletedEvent($share));
-
-		// All the deleted shares caused by this delete
-		$deletedShares[] = $share;
-
-		// Emit post hook
-		$event->setArgument('deletedShares', $deletedShares);
-		$this->legacyDispatcher->dispatch('OCP\Share::postUnshare', $event);
-	}
-
-
-	/**
-	 * Unshare a file as the recipient.
-	 * This can be different from a regular delete for example when one of
-	 * the users in a groups deletes that share. But the provider should
-	 * handle this.
-	 *
-	 * @param IShare $share
-	 * @param string $recipientId
-	 */
-	public function deleteFromSelf(IShare $share, $recipientId) {
-		[$providerId,] = $this->splitFullId($share->getFullId());
-		$provider = $this->factory->getProvider($providerId);
-
-		$provider->deleteFromSelf($share, $recipientId);
-		$event = new GenericEvent($share);
-		$this->legacyDispatcher->dispatch('OCP\Share::postUnshareFromSelf', $event);
-	}
-
-	public function restoreShare(IShare $share, string $recipientId): IShare {
-		[$providerId,] = $this->splitFullId($share->getFullId());
-		$provider = $this->factory->getProvider($providerId);
-
-		return $provider->restore($share, $recipientId);
-	}
-
-	/**
-	 * @inheritdoc
-	 */
-	public function moveShare(IShare $share, $recipientId) {
-		if ($share->getShareType() === IShare::TYPE_LINK
-			|| $share->getShareType() === IShare::TYPE_EMAIL) {
-			throw new \InvalidArgumentException('Cannot change target of link share');
-		}
-
-		if ($share->getShareType() === IShare::TYPE_USER && $share->getSharedWith() !== $recipientId) {
-			throw new \InvalidArgumentException('Invalid recipient');
-		}
-
-		if ($share->getShareType() === IShare::TYPE_GROUP) {
-			$sharedWith = $this->groupManager->get($share->getSharedWith());
-			if (is_null($sharedWith)) {
-				throw new \InvalidArgumentException('Group "' . $share->getSharedWith() . '" does not exist');
-			}
-			$recipient = $this->userManager->get($recipientId);
-			if (!$sharedWith->inGroup($recipient)) {
-				throw new \InvalidArgumentException('Invalid recipient');
-			}
-		}
-
-		[$providerId,] = $this->splitFullId($share->getFullId());
-		$provider = $this->factory->getProvider($providerId);
-
-		return $provider->move($share, $recipientId);
-	}
-
-	public function getSharesInFolder($userId, Folder $node, $reshares = false, $shallow = true) {
-		$providers = $this->factory->getAllProviders();
-
-		return array_reduce($providers, function ($shares, IShareProvider $provider) use ($userId, $node, $reshares, $shallow) {
-			$newShares = $provider->getSharesInFolder($userId, $node, $reshares, $shallow);
-			foreach ($newShares as $fid => $data) {
-				if (!isset($shares[$fid])) {
-					$shares[$fid] = [];
-				}
-
-				$shares[$fid] = array_merge($shares[$fid], $data);
-			}
-			return $shares;
-		}, []);
-	}
-
-	/**
-	 * @inheritdoc
-	 */
-	public function getSharesBy($userId, $shareType, $path = null, $reshares = false, $limit = 50, $offset = 0) {
-		if ($path !== null &&
-			!($path instanceof \OCP\Files\File) &&
-			!($path instanceof \OCP\Files\Folder)) {
-			throw new \InvalidArgumentException('invalid path');
-		}
-
-		try {
-			$provider = $this->factory->getProviderForType($shareType);
-		} catch (ProviderException $e) {
-			return [];
-		}
-
-		$shares = $provider->getSharesBy($userId, $shareType, $path, $reshares, $limit, $offset);
-
-		/*
+        $storage = $share->getNode()->getStorage();
+        if ($storage->instanceOfStorage('OCA\Files_Sharing\External\Storage')) {
+            $parent = $share->getNode()->getParent();
+            while ($parent->getStorage()->instanceOfStorage('OCA\Files_Sharing\External\Storage')) {
+                $parent = $parent->getParent();
+            }
+            $share->setShareOwner($parent->getOwner()->getUID());
+        } else {
+            if ($share->getNode()->getOwner()) {
+                $share->setShareOwner($share->getNode()->getOwner()->getUID());
+            } else {
+                $share->setShareOwner($share->getSharedBy());
+            }
+        }
+
+        try {
+            // Verify share type
+            if ($share->getShareType() === IShare::TYPE_USER) {
+                $this->userCreateChecks($share);
+
+                // Verify the expiration date
+                $share = $this->validateExpirationDateInternal($share);
+            } elseif ($share->getShareType() === IShare::TYPE_GROUP) {
+                $this->groupCreateChecks($share);
+
+                // Verify the expiration date
+                $share = $this->validateExpirationDateInternal($share);
+            } elseif ($share->getShareType() === IShare::TYPE_REMOTE || $share->getShareType() === IShare::TYPE_REMOTE_GROUP) {
+                //Verify the expiration date
+                $share = $this->validateExpirationDateInternal($share);
+            } elseif ($share->getShareType() === IShare::TYPE_LINK
+                || $share->getShareType() === IShare::TYPE_EMAIL) {
+                $this->linkCreateChecks($share);
+                $this->setLinkParent($share);
+
+                // For now ignore a set token.
+                $share->setToken(
+                    $this->secureRandom->generate(
+                        \OC\Share\Constants::TOKEN_LENGTH,
+                        \OCP\Security\ISecureRandom::CHAR_HUMAN_READABLE
+                    )
+                );
+
+                // Verify the expiration date
+                $share = $this->validateExpirationDateLink($share);
+
+                // Verify the password
+                $this->verifyPassword($share->getPassword());
+
+                // If a password is set. Hash it!
+                if ($share->getShareType() === IShare::TYPE_LINK
+                    && $share->getPassword() !== null) {
+                    $share->setPassword($this->hasher->hash($share->getPassword()));
+                }
+            }
+
+            // Cannot share with the owner
+            if ($share->getShareType() === IShare::TYPE_USER &&
+                $share->getSharedWith() === $share->getShareOwner()) {
+                throw new \InvalidArgumentException('Cannot share with the share owner');
+            }
+
+            // Generate the target
+            $defaultShareFolder = $this->config->getSystemValue('share_folder', '/');
+            $allowCustomShareFolder = $this->config->getSystemValueBool('sharing.allow_custom_share_folder', true);
+            if ($allowCustomShareFolder) {
+                $shareFolder = $this->config->getUserValue($share->getSharedWith(), Application::APP_ID, 'share_folder', $defaultShareFolder);
+            } else {
+                $shareFolder = $defaultShareFolder;
+            }
+
+            $target = $shareFolder . '/' . $share->getNode()->getName();
+            $target = \OC\Files\Filesystem::normalizePath($target);
+            $share->setTarget($target);
+
+            // Pre share event
+            $event = new GenericEvent($share);
+            $this->legacyDispatcher->dispatch('OCP\Share::preShare', $event);
+            if ($event->isPropagationStopped() && $event->hasArgument('error')) {
+                throw new \Exception($event->getArgument('error'));
+            }
+
+            $oldShare = $share;
+            $provider = $this->factory->getProviderForType($share->getShareType());
+            $share = $provider->create($share);
+
+            // Reuse the node we already have
+            $share->setNode($oldShare->getNode());
+
+            // Reset the target if it is null for the new share
+            if ($share->getTarget() === '') {
+                $share->setTarget($target);
+            }
+        } catch (AlreadySharedException $e) {
+            // if a share for the same target already exists, dont create a new one, but do trigger the hooks and notifications again
+            $oldShare = $share;
+
+            // Reuse the node we already have
+            $share = $e->getExistingShare();
+            $share->setNode($oldShare->getNode());
+        }
+
+        // Post share event
+        $event = new GenericEvent($share);
+        $this->legacyDispatcher->dispatch('OCP\Share::postShare', $event);
+
+        $this->dispatcher->dispatchTyped(new Share\Events\ShareCreatedEvent($share));
+
+        if ($this->config->getSystemValueBool('sharing.enable_share_mail', true)
+            && $share->getShareType() === IShare::TYPE_USER) {
+            $mailSend = $share->getMailSend();
+            if ($mailSend === true) {
+                $user = $this->userManager->get($share->getSharedWith());
+                if ($user !== null) {
+                    $emailAddress = $user->getEMailAddress();
+                    if ($emailAddress !== null && $emailAddress !== '') {
+                        $userLang = $this->l10nFactory->getUserLanguage($user);
+                        $l = $this->l10nFactory->get('lib', $userLang);
+                        $this->sendMailNotification(
+                            $l,
+                            $share->getNode()->getName(),
+                            $this->urlGenerator->linkToRouteAbsolute('files_sharing.Accept.accept', ['shareId' => $share->getFullId()]),
+                            $share->getSharedBy(),
+                            $emailAddress,
+                            $share->getExpirationDate(),
+                            $share->getNote()
+                        );
+                        $this->logger->debug('Sent share notification to ' . $emailAddress . ' for share with ID ' . $share->getId(), ['app' => 'share']);
+                    } else {
+                        $this->logger->debug('Share notification not sent to ' . $share->getSharedWith() . ' because email address is not set.', ['app' => 'share']);
+                    }
+                } else {
+                    $this->logger->debug('Share notification not sent to ' . $share->getSharedWith() . ' because user could not be found.', ['app' => 'share']);
+                }
+            } else {
+                $this->logger->debug('Share notification not sent because mailsend is false.', ['app' => 'share']);
+            }
+        }
+
+        return $share;
+    }
+
+    /**
+     * Send mail notifications
+     *
+     * This method will catch and log mail transmission errors
+     *
+     * @param IL10N $l Language of the recipient
+     * @param string $filename file/folder name
+     * @param string $link link to the file/folder
+     * @param string $initiator user ID of share sender
+     * @param string $shareWith email address of share receiver
+     * @param \DateTime|null $expiration
+     */
+    protected function sendMailNotification(IL10N $l,
+                                            $filename,
+                                            $link,
+                                            $initiator,
+                                            $shareWith,
+                                            \DateTime $expiration = null,
+                                            $note = '') {
+        $initiatorUser = $this->userManager->get($initiator);
+        $initiatorDisplayName = ($initiatorUser instanceof IUser) ? $initiatorUser->getDisplayName() : $initiator;
+
+        $message = $this->mailer->createMessage();
+
+        $emailTemplate = $this->mailer->createEMailTemplate('files_sharing.RecipientNotification', [
+            'filename' => $filename,
+            'link' => $link,
+            'initiator' => $initiatorDisplayName,
+            'expiration' => $expiration,
+            'shareWith' => $shareWith,
+        ]);
+
+        $emailTemplate->setSubject($l->t('%1$s shared »%2$s« with you', [$initiatorDisplayName, $filename]));
+        $emailTemplate->addHeader();
+        $emailTemplate->addHeading($l->t('%1$s shared »%2$s« with you', [$initiatorDisplayName, $filename]), false);
+        $text = $l->t('%1$s shared »%2$s« with you.', [$initiatorDisplayName, $filename]);
+
+        if ($note !== '') {
+            $emailTemplate->addBodyText(htmlspecialchars($note), $note);
+        }
+
+        $emailTemplate->addBodyText(
+            htmlspecialchars($text . ' ' . $l->t('Click the button below to open it.')),
+            $text
+        );
+        $emailTemplate->addBodyButton(
+            $l->t('Open »%s«', [$filename]),
+            $link
+        );
+
+        $message->setTo([$shareWith]);
+
+        // The "From" contains the sharers name
+        $instanceName = $this->defaults->getName();
+        $senderName = $l->t(
+            '%1$s via %2$s',
+            [
+                $initiatorDisplayName,
+                $instanceName,
+            ]
+        );
+        $message->setFrom([\OCP\Util::getDefaultEmailAddress('noreply') => $senderName]);
+
+        // The "Reply-To" is set to the sharer if an mail address is configured
+        // also the default footer contains a "Do not reply" which needs to be adjusted.
+        $initiatorEmail = $initiatorUser->getEMailAddress();
+        if ($initiatorEmail !== null) {
+            $message->setReplyTo([$initiatorEmail => $initiatorDisplayName]);
+            $emailTemplate->addFooter($instanceName . ($this->defaults->getSlogan($l->getLanguageCode()) !== '' ? ' - ' . $this->defaults->getSlogan($l->getLanguageCode()) : ''));
+        } else {
+            $emailTemplate->addFooter('', $l->getLanguageCode());
+        }
+
+        $message->useTemplate($emailTemplate);
+        try {
+            $failedRecipients = $this->mailer->send($message);
+            if (!empty($failedRecipients)) {
+                $this->logger->error('Share notification mail could not be sent to: ' . implode(', ', $failedRecipients));
+                return;
+            }
+        } catch (\Exception $e) {
+            $this->logger->error('Share notification mail could not be sent', ['exception' => $e]);
+        }
+    }
+
+    /**
+     * Update a share
+     *
+     * @param IShare $share
+     * @return IShare The share object
+     * @throws \InvalidArgumentException
+     */
+    public function updateShare(IShare $share) {
+        $expirationDateUpdated = false;
+
+        $this->canShare($share);
+
+        try {
+            $originalShare = $this->getShareById($share->getFullId());
+        } catch (\UnexpectedValueException $e) {
+            throw new \InvalidArgumentException('Share does not have a full id');
+        }
+
+        // We cannot change the share type!
+        if ($share->getShareType() !== $originalShare->getShareType()) {
+            throw new \InvalidArgumentException('Cannot change share type');
+        }
+
+        // We can only change the recipient on user shares
+        if ($share->getSharedWith() !== $originalShare->getSharedWith() &&
+            $share->getShareType() !== IShare::TYPE_USER) {
+            throw new \InvalidArgumentException('Can only update recipient on user shares');
+        }
+
+        // Cannot share with the owner
+        if ($share->getShareType() === IShare::TYPE_USER &&
+            $share->getSharedWith() === $share->getShareOwner()) {
+            throw new \InvalidArgumentException('Cannot share with the share owner');
+        }
+
+        $this->generalCreateChecks($share);
+
+        if ($share->getShareType() === IShare::TYPE_USER) {
+            $this->userCreateChecks($share);
+
+            if ($share->getExpirationDate() != $originalShare->getExpirationDate()) {
+                //Verify the expiration date
+                $this->validateExpirationDateInternal($share);
+                $expirationDateUpdated = true;
+            }
+        } elseif ($share->getShareType() === IShare::TYPE_GROUP) {
+            $this->groupCreateChecks($share);
+
+            if ($share->getExpirationDate() != $originalShare->getExpirationDate()) {
+                //Verify the expiration date
+                $this->validateExpirationDateInternal($share);
+                $expirationDateUpdated = true;
+            }
+        } elseif ($share->getShareType() === IShare::TYPE_LINK
+            || $share->getShareType() === IShare::TYPE_EMAIL) {
+            $this->linkCreateChecks($share);
+
+            // The new password is not set again if it is the same as the old
+            // one, unless when switching from sending by Talk to sending by
+            // mail.
+            $plainTextPassword = $share->getPassword();
+            $updatedPassword = $this->updateSharePasswordIfNeeded($share, $originalShare);
+
+            /**
+             * Cannot enable the getSendPasswordByTalk if there is no password set
+             */
+            if (empty($plainTextPassword) && $share->getSendPasswordByTalk()) {
+                throw new \InvalidArgumentException('Cannot enable sending the password by Talk with an empty password');
+            }
+
+            /**
+             * If we're in a mail share, we need to force a password change
+             * as either the user is not aware of the password or is already (received by mail)
+             * Thus the SendPasswordByTalk feature would not make sense
+             */
+            if (!$updatedPassword && $share->getShareType() === IShare::TYPE_EMAIL) {
+                if (!$originalShare->getSendPasswordByTalk() && $share->getSendPasswordByTalk()) {
+                    throw new \InvalidArgumentException('Cannot enable sending the password by Talk without setting a new password');
+                }
+                if ($originalShare->getSendPasswordByTalk() && !$share->getSendPasswordByTalk()) {
+                    throw new \InvalidArgumentException('Cannot disable sending the password by Talk without setting a new password');
+                }
+            }
+
+            if ($share->getExpirationDate() != $originalShare->getExpirationDate()) {
+                // Verify the expiration date
+                $this->validateExpirationDateLink($share);
+                $expirationDateUpdated = true;
+            }
+        } elseif ($share->getShareType() === IShare::TYPE_REMOTE || $share->getShareType() === IShare::TYPE_REMOTE_GROUP) {
+            if ($share->getExpirationDate() != $originalShare->getExpirationDate()) {
+                //Verify the expiration date
+                $this->validateExpirationDateInternal($share);
+                $expirationDateUpdated = true;
+            }
+        }
+
+        $this->pathCreateChecks($share->getNode());
+
+        // Now update the share!
+        $provider = $this->factory->getProviderForType($share->getShareType());
+        if ($share->getShareType() === IShare::TYPE_EMAIL) {
+            $share = $provider->update($share, $plainTextPassword);
+        } else {
+            $share = $provider->update($share);
+        }
+
+        if ($expirationDateUpdated === true) {
+            \OC_Hook::emit(Share::class, 'post_set_expiration_date', [
+                'itemType' => $share->getNode() instanceof \OCP\Files\File ? 'file' : 'folder',
+                'itemSource' => $share->getNode()->getId(),
+                'date' => $share->getExpirationDate(),
+                'uidOwner' => $share->getSharedBy(),
+            ]);
+        }
+
+        if ($share->getPassword() !== $originalShare->getPassword()) {
+            \OC_Hook::emit(Share::class, 'post_update_password', [
+                'itemType' => $share->getNode() instanceof \OCP\Files\File ? 'file' : 'folder',
+                'itemSource' => $share->getNode()->getId(),
+                'uidOwner' => $share->getSharedBy(),
+                'token' => $share->getToken(),
+                'disabled' => is_null($share->getPassword()),
+            ]);
+        }
+
+        if ($share->getPermissions() !== $originalShare->getPermissions()) {
+            if ($this->userManager->userExists($share->getShareOwner())) {
+                $userFolder = $this->rootFolder->getUserFolder($share->getShareOwner());
+            } else {
+                $userFolder = $this->rootFolder->getUserFolder($share->getSharedBy());
+            }
+            \OC_Hook::emit(Share::class, 'post_update_permissions', [
+                'itemType' => $share->getNode() instanceof \OCP\Files\File ? 'file' : 'folder',
+                'itemSource' => $share->getNode()->getId(),
+                'shareType' => $share->getShareType(),
+                'shareWith' => $share->getSharedWith(),
+                'uidOwner' => $share->getSharedBy(),
+                'permissions' => $share->getPermissions(),
+                'attributes' => $share->getAttributes() !== null ? $share->getAttributes()->toArray() : null,
+                'path' => $userFolder->getRelativePath($share->getNode()->getPath()),
+            ]);
+        }
+
+        return $share;
+    }
+
+    /**
+     * Accept a share.
+     *
+     * @param IShare $share
+     * @param string $recipientId
+     * @return IShare The share object
+     * @throws \InvalidArgumentException
+     * @since 9.0.0
+     */
+    public function acceptShare(IShare $share, string $recipientId): IShare {
+        [$providerId,] = $this->splitFullId($share->getFullId());
+        $provider = $this->factory->getProvider($providerId);
+
+        if (!method_exists($provider, 'acceptShare')) {
+            // TODO FIX ME
+            throw new \InvalidArgumentException('Share provider does not support accepting');
+        }
+        $provider->acceptShare($share, $recipientId);
+        $event = new GenericEvent($share);
+        $this->legacyDispatcher->dispatch('OCP\Share::postAcceptShare', $event);
+
+        return $share;
+    }
+
+    /**
+     * Updates the password of the given share if it is not the same as the
+     * password of the original share.
+     *
+     * @param IShare $share the share to update its password.
+     * @param IShare $originalShare the original share to compare its
+     *        password with.
+     * @return boolean whether the password was updated or not.
+     */
+    private function updateSharePasswordIfNeeded(IShare $share, IShare $originalShare) {
+        $passwordsAreDifferent = ($share->getPassword() !== $originalShare->getPassword()) &&
+            (($share->getPassword() !== null && $originalShare->getPassword() === null) ||
+                ($share->getPassword() === null && $originalShare->getPassword() !== null) ||
+                ($share->getPassword() !== null && $originalShare->getPassword() !== null &&
+                    !$this->hasher->verify($share->getPassword(), $originalShare->getPassword())));
+
+        // Password updated.
+        if ($passwordsAreDifferent) {
+            //Verify the password
+            $this->verifyPassword($share->getPassword());
+
+            // If a password is set. Hash it!
+            if (!empty($share->getPassword())) {
+                $share->setPassword($this->hasher->hash($share->getPassword()));
+                if ($share->getShareType() === IShare::TYPE_EMAIL) {
+                    // Shares shared by email have temporary passwords
+                    $this->setSharePasswordExpirationTime($share);
+                }
+
+                return true;
+            } else {
+                // Empty string and null are seen as NOT password protected
+                $share->setPassword(null);
+                if ($share->getShareType() === IShare::TYPE_EMAIL) {
+                    $share->setPasswordExpirationTime(null);
+                }
+                return true;
+            }
+        } else {
+            // Reset the password to the original one, as it is either the same
+            // as the "new" password or a hashed version of it.
+            $share->setPassword($originalShare->getPassword());
+        }
+
+        return false;
+    }
+
+    /**
+     * Set the share's password expiration time
+     */
+    private function setSharePasswordExpirationTime(IShare $share): void {
+        if (!$this->config->getSystemValue('sharing.enable_mail_link_password_expiration', false)) {
+            // Sets password expiration date to NULL
+            $share->setPasswordExpirationTime();
+            return;
+        }
+        // Sets password expiration date
+        $expirationTime = null;
+        $now = new \DateTime();
+        $expirationInterval = $this->config->getSystemValue('sharing.mail_link_password_expiration_interval', 3600);
+        $expirationTime = $now->add(new \DateInterval('PT' . $expirationInterval . 'S'));
+        $share->setPasswordExpirationTime($expirationTime);
+    }
+
+
+    /**
+     * Delete all the children of this share
+     * FIXME: remove once https://github.com/owncloud/core/pull/21660 is in
+     *
+     * @param IShare $share
+     * @return IShare[] List of deleted shares
+     */
+    protected function deleteChildren(IShare $share) {
+        $deletedShares = [];
+
+        $provider = $this->factory->getProviderForType($share->getShareType());
+
+        foreach ($provider->getChildren($share) as $child) {
+            $deletedChildren = $this->deleteChildren($child);
+            $deletedShares = array_merge($deletedShares, $deletedChildren);
+
+            $provider->delete($child);
+            $this->dispatcher->dispatchTyped(new Share\Events\ShareDeletedEvent($child));
+            $deletedShares[] = $child;
+        }
+
+        return $deletedShares;
+    }
+
+    /**
+     * Delete a share
+     *
+     * @param IShare $share
+     * @throws ShareNotFound
+     * @throws \InvalidArgumentException
+     */
+    public function deleteShare(IShare $share) {
+        try {
+            $share->getFullId();
+        } catch (\UnexpectedValueException $e) {
+            throw new \InvalidArgumentException('Share does not have a full id');
+        }
+
+        $event = new GenericEvent($share);
+        $this->legacyDispatcher->dispatch('OCP\Share::preUnshare', $event);
+
+        // Get all children and delete them as well
+        $deletedShares = $this->deleteChildren($share);
+
+        // Do the actual delete
+        $provider = $this->factory->getProviderForType($share->getShareType());
+        $provider->delete($share);
+
+        $this->dispatcher->dispatchTyped(new Share\Events\ShareDeletedEvent($share));
+
+        // All the deleted shares caused by this delete
+        $deletedShares[] = $share;
+
+        // Emit post hook
+        $event->setArgument('deletedShares', $deletedShares);
+        $this->legacyDispatcher->dispatch('OCP\Share::postUnshare', $event);
+    }
+
+
+    /**
+     * Unshare a file as the recipient.
+     * This can be different from a regular delete for example when one of
+     * the users in a groups deletes that share. But the provider should
+     * handle this.
+     *
+     * @param IShare $share
+     * @param string $recipientId
+     */
+    public function deleteFromSelf(IShare $share, $recipientId) {
+        [$providerId,] = $this->splitFullId($share->getFullId());
+        $provider = $this->factory->getProvider($providerId);
+
+        $provider->deleteFromSelf($share, $recipientId);
+        $event = new GenericEvent($share);
+        $this->legacyDispatcher->dispatch('OCP\Share::postUnshareFromSelf', $event);
+    }
+
+    public function restoreShare(IShare $share, string $recipientId): IShare {
+        [$providerId,] = $this->splitFullId($share->getFullId());
+        $provider = $this->factory->getProvider($providerId);
+
+        return $provider->restore($share, $recipientId);
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function moveShare(IShare $share, $recipientId) {
+        if ($share->getShareType() === IShare::TYPE_LINK
+            || $share->getShareType() === IShare::TYPE_EMAIL) {
+            throw new \InvalidArgumentException('Cannot change target of link share');
+        }
+
+        if ($share->getShareType() === IShare::TYPE_USER && $share->getSharedWith() !== $recipientId) {
+            throw new \InvalidArgumentException('Invalid recipient');
+        }
+
+        if ($share->getShareType() === IShare::TYPE_GROUP) {
+            $sharedWith = $this->groupManager->get($share->getSharedWith());
+            if (is_null($sharedWith)) {
+                throw new \InvalidArgumentException('Group "' . $share->getSharedWith() . '" does not exist');
+            }
+            $recipient = $this->userManager->get($recipientId);
+            if (!$sharedWith->inGroup($recipient)) {
+                throw new \InvalidArgumentException('Invalid recipient');
+            }
+        }
+
+        [$providerId,] = $this->splitFullId($share->getFullId());
+        $provider = $this->factory->getProvider($providerId);
+
+        return $provider->move($share, $recipientId);
+    }
+
+    public function getSharesInFolder($userId, Folder $node, $reshares = false, $shallow = true) {
+        $providers = $this->factory->getAllProviders();
+
+        return array_reduce($providers, function ($shares, IShareProvider $provider) use ($userId, $node, $reshares, $shallow) {
+            $newShares = $provider->getSharesInFolder($userId, $node, $reshares, $shallow);
+            foreach ($newShares as $fid => $data) {
+                if (!isset($shares[$fid])) {
+                    $shares[$fid] = [];
+                }
+
+                $shares[$fid] = array_merge($shares[$fid], $data);
+            }
+            return $shares;
+        }, []);
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function getSharesBy($userId, $shareType, $path = null, $reshares = false, $limit = 50, $offset = 0) {
+        if ($path !== null &&
+            !($path instanceof \OCP\Files\File) &&
+            !($path instanceof \OCP\Files\Folder)) {
+            throw new \InvalidArgumentException('invalid path');
+        }
+
+        try {
+            $provider = $this->factory->getProviderForType($shareType);
+        } catch (ProviderException $e) {
+            return [];
+        }
+
+        $shares = $provider->getSharesBy($userId, $shareType, $path, $reshares, $limit, $offset);
+
+        /*
 		 * Work around so we don't return expired shares but still follow
 		 * proper pagination.
 		 */
 
-		$shares2 = [];
-
-		while (true) {
-			$added = 0;
-			foreach ($shares as $share) {
-				try {
-					$this->checkExpireDate($share);
-				} catch (ShareNotFound $e) {
-					//Ignore since this basically means the share is deleted
-					continue;
-				}
-
-				$added++;
-				$shares2[] = $share;
-
-				if (count($shares2) === $limit) {
-					break;
-				}
-			}
-
-			// If we did not fetch more shares than the limit then there are no more shares
-			if (count($shares) < $limit) {
-				break;
-			}
-
-			if (count($shares2) === $limit) {
-				break;
-			}
-
-			// If there was no limit on the select we are done
-			if ($limit === -1) {
-				break;
-			}
-
-			$offset += $added;
-
-			// Fetch again $limit shares
-			$shares = $provider->getSharesBy($userId, $shareType, $path, $reshares, $limit, $offset);
-
-			// No more shares means we are done
-			if (empty($shares)) {
-				break;
-			}
-		}
-
-		$shares = $shares2;
-
-		return $shares;
-	}
-
-	/**
-	 * @inheritdoc
-	 */
-	public function getSharedWith($userId, $shareType, $node = null, $limit = 50, $offset = 0) {
-		try {
-			$provider = $this->factory->getProviderForType($shareType);
-		} catch (ProviderException $e) {
-			return [];
-		}
-
-		$shares = $provider->getSharedWith($userId, $shareType, $node, $limit, $offset);
-
-		// remove all shares which are already expired
-		foreach ($shares as $key => $share) {
-			try {
-				$this->checkExpireDate($share);
-			} catch (ShareNotFound $e) {
-				unset($shares[$key]);
-			}
-		}
-
-		return $shares;
-	}
-
-	/**
-	 * @inheritdoc
-	 */
-	public function getDeletedSharedWith($userId, $shareType, $node = null, $limit = 50, $offset = 0) {
-		$shares = $this->getSharedWith($userId, $shareType, $node, $limit, $offset);
-
-		// Only get deleted shares
-		$shares = array_filter($shares, function (IShare $share) {
-			return $share->getPermissions() === 0;
-		});
-
-		// Only get shares where the owner still exists
-		$shares = array_filter($shares, function (IShare $share) {
-			return $this->userManager->userExists($share->getShareOwner());
-		});
-
-		return $shares;
-	}
-
-	/**
-	 * @inheritdoc
-	 */
-	public function getShareById($id, $recipient = null) {
-		if ($id === null) {
-			throw new ShareNotFound();
-		}
-
-		[$providerId, $id] = $this->splitFullId($id);
-
-		try {
-			$provider = $this->factory->getProvider($providerId);
-		} catch (ProviderException $e) {
-			throw new ShareNotFound();
-		}
-
-		$share = $provider->getShareById($id, $recipient);
-
-		$this->checkExpireDate($share);
-
-		return $share;
-	}
-
-	/**
-	 * Get all the shares for a given path
-	 *
-	 * @param \OCP\Files\Node $path
-	 * @param int $page
-	 * @param int $perPage
-	 *
-	 * @return Share[]
-	 */
-	public function getSharesByPath(\OCP\Files\Node $path, $page = 0, $perPage = 50) {
-		return [];
-	}
-
-	/**
-	 * Get the share by token possible with password
-	 *
-	 * @param string $token
-	 * @return IShare
-	 *
-	 * @throws ShareNotFound
-	 */
-	public function getShareByToken($token) {
-		// tokens cannot be valid local user names
-		if ($this->userManager->userExists($token)) {
-			throw new ShareNotFound();
-		}
-		$share = null;
-		try {
-			if ($this->shareApiAllowLinks()) {
-				$provider = $this->factory->getProviderForType(IShare::TYPE_LINK);
-				$share = $provider->getShareByToken($token);
-			}
-		} catch (ProviderException $e) {
-		} catch (ShareNotFound $e) {
-		}
-
-
-		// If it is not a link share try to fetch a federated share by token
-		if ($share === null) {
-			try {
-				$provider = $this->factory->getProviderForType(IShare::TYPE_REMOTE);
-				$share = $provider->getShareByToken($token);
-			} catch (ProviderException $e) {
-			} catch (ShareNotFound $e) {
-			}
-		}
-
-		// If it is not a link share try to fetch a mail share by token
-		if ($share === null && $this->shareProviderExists(IShare::TYPE_EMAIL)) {
-			try {
-				$provider = $this->factory->getProviderForType(IShare::TYPE_EMAIL);
-				$share = $provider->getShareByToken($token);
-			} catch (ProviderException $e) {
-			} catch (ShareNotFound $e) {
-			}
-		}
-
-		if ($share === null && $this->shareProviderExists(IShare::TYPE_CIRCLE)) {
-			try {
-				$provider = $this->factory->getProviderForType(IShare::TYPE_CIRCLE);
-				$share = $provider->getShareByToken($token);
-			} catch (ProviderException $e) {
-			} catch (ShareNotFound $e) {
-			}
-		}
-
-		if ($share === null && $this->shareProviderExists(IShare::TYPE_ROOM)) {
-			try {
-				$provider = $this->factory->getProviderForType(IShare::TYPE_ROOM);
-				$share = $provider->getShareByToken($token);
-			} catch (ProviderException $e) {
-			} catch (ShareNotFound $e) {
-			}
-		}
-
-		if ($share === null) {
-			throw new ShareNotFound($this->l->t('The requested share does not exist anymore'));
-		}
-
-		$this->checkExpireDate($share);
-
-		/*
+        $shares2 = [];
+
+        while (true) {
+            $added = 0;
+            foreach ($shares as $share) {
+                try {
+                    $this->checkExpireDate($share);
+                } catch (ShareNotFound $e) {
+                    //Ignore since this basically means the share is deleted
+                    continue;
+                }
+
+                $added++;
+                $shares2[] = $share;
+
+                if (count($shares2) === $limit) {
+                    break;
+                }
+            }
+
+            // If we did not fetch more shares than the limit then there are no more shares
+            if (count($shares) < $limit) {
+                break;
+            }
+
+            if (count($shares2) === $limit) {
+                break;
+            }
+
+            // If there was no limit on the select we are done
+            if ($limit === -1) {
+                break;
+            }
+
+            $offset += $added;
+
+            // Fetch again $limit shares
+            $shares = $provider->getSharesBy($userId, $shareType, $path, $reshares, $limit, $offset);
+
+            // No more shares means we are done
+            if (empty($shares)) {
+                break;
+            }
+        }
+
+        $shares = $shares2;
+
+        return $shares;
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function getSharedWith($userId, $shareType, $node = null, $limit = 50, $offset = 0) {
+        try {
+            $provider = $this->factory->getProviderForType($shareType);
+        } catch (ProviderException $e) {
+            return [];
+        }
+
+        $shares = $provider->getSharedWith($userId, $shareType, $node, $limit, $offset);
+
+        // remove all shares which are already expired
+        foreach ($shares as $key => $share) {
+            try {
+                $this->checkExpireDate($share);
+            } catch (ShareNotFound $e) {
+                unset($shares[$key]);
+            }
+        }
+
+        return $shares;
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function getDeletedSharedWith($userId, $shareType, $node = null, $limit = 50, $offset = 0) {
+        $shares = $this->getSharedWith($userId, $shareType, $node, $limit, $offset);
+
+        // Only get deleted shares
+        $shares = array_filter($shares, function (IShare $share) {
+            return $share->getPermissions() === 0;
+        });
+
+        // Only get shares where the owner still exists
+        $shares = array_filter($shares, function (IShare $share) {
+            return $this->userManager->userExists($share->getShareOwner());
+        });
+
+        return $shares;
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function getShareById($id, $recipient = null) {
+        if ($id === null) {
+            throw new ShareNotFound();
+        }
+
+        [$providerId, $id] = $this->splitFullId($id);
+
+        try {
+            $provider = $this->factory->getProvider($providerId);
+        } catch (ProviderException $e) {
+            throw new ShareNotFound();
+        }
+
+        $share = $provider->getShareById($id, $recipient);
+
+        $this->checkExpireDate($share);
+
+        return $share;
+    }
+
+    /**
+     * Get all the shares for a given path
+     *
+     * @param \OCP\Files\Node $path
+     * @param int $page
+     * @param int $perPage
+     *
+     * @return Share[]
+     */
+    public function getSharesByPath(\OCP\Files\Node $path, $page = 0, $perPage = 50) {
+        return [];
+    }
+
+    /**
+     * Get the share by token possible with password
+     *
+     * @param string $token
+     * @return IShare
+     *
+     * @throws ShareNotFound
+     */
+    public function getShareByToken($token) {
+        // tokens cannot be valid local user names
+        if ($this->userManager->userExists($token)) {
+            throw new ShareNotFound();
+        }
+        $share = null;
+        try {
+            if ($this->shareApiAllowLinks()) {
+                $provider = $this->factory->getProviderForType(IShare::TYPE_LINK);
+                $share = $provider->getShareByToken($token);
+            }
+        } catch (ProviderException $e) {
+        } catch (ShareNotFound $e) {
+        }
+
+
+        // If it is not a link share try to fetch a federated share by token
+        if ($share === null) {
+            try {
+                $provider = $this->factory->getProviderForType(IShare::TYPE_REMOTE);
+                $share = $provider->getShareByToken($token);
+            } catch (ProviderException $e) {
+            } catch (ShareNotFound $e) {
+            }
+        }
+
+        // If it is not a link share try to fetch a mail share by token
+        if ($share === null && $this->shareProviderExists(IShare::TYPE_EMAIL)) {
+            try {
+                $provider = $this->factory->getProviderForType(IShare::TYPE_EMAIL);
+                $share = $provider->getShareByToken($token);
+            } catch (ProviderException $e) {
+            } catch (ShareNotFound $e) {
+            }
+        }
+
+        if ($share === null && $this->shareProviderExists(IShare::TYPE_CIRCLE)) {
+            try {
+                $provider = $this->factory->getProviderForType(IShare::TYPE_CIRCLE);
+                $share = $provider->getShareByToken($token);
+            } catch (ProviderException $e) {
+            } catch (ShareNotFound $e) {
+            }
+        }
+
+        if ($share === null && $this->shareProviderExists(IShare::TYPE_ROOM)) {
+            try {
+                $provider = $this->factory->getProviderForType(IShare::TYPE_ROOM);
+                $share = $provider->getShareByToken($token);
+            } catch (ProviderException $e) {
+            } catch (ShareNotFound $e) {
+            }
+        }
+
+        if ($share === null) {
+            throw new ShareNotFound($this->l->t('The requested share does not exist anymore'));
+        }
+
+        $this->checkExpireDate($share);
+
+        /*
 		 * Reduce the permissions for link or email shares if public upload is not enabled
 		 */
-		if (($share->getShareType() === IShare::TYPE_LINK || $share->getShareType() === IShare::TYPE_EMAIL)
-			&& $share->getNodeType() === 'folder' && !$this->shareApiLinkAllowPublicUpload()) {
-			$share->setPermissions($share->getPermissions() & ~(\OCP\Constants::PERMISSION_CREATE | \OCP\Constants::PERMISSION_UPDATE));
-		}
-
-		return $share;
-	}
-
-	protected function checkExpireDate($share) {
-		if ($share->isExpired()) {
-			$this->deleteShare($share);
-			throw new ShareNotFound($this->l->t('The requested share does not exist anymore'));
-		}
-	}
-
-	/**
-	 * Verify the password of a public share
-	 *
-	 * @param IShare $share
-	 * @param ?string $password
-	 * @return bool
-	 */
-	public function checkPassword(IShare $share, $password) {
-		$passwordProtected = $share->getShareType() !== IShare::TYPE_LINK
-			|| $share->getShareType() !== IShare::TYPE_EMAIL
-			|| $share->getShareType() !== IShare::TYPE_CIRCLE;
-		if (!$passwordProtected) {
-			//TODO maybe exception?
-			return false;
-		}
-
-		if ($password === null || $share->getPassword() === null) {
-			return false;
-		}
-
-		// Makes sure password hasn't expired
-		$expirationTime = $share->getPasswordExpirationTime();
-		if ($expirationTime !== null && $expirationTime < new \DateTime()) {
-			return false;
-		}
-
-		$newHash = '';
-		if (!$this->hasher->verify($password, $share->getPassword(), $newHash)) {
-			return false;
-		}
-
-		if (!empty($newHash)) {
-			$share->setPassword($newHash);
-			$provider = $this->factory->getProviderForType($share->getShareType());
-			$provider->update($share);
-		}
-
-		return true;
-	}
-
-	/**
-	 * @inheritdoc
-	 */
-	public function userDeleted($uid) {
-		$types = [IShare::TYPE_USER, IShare::TYPE_GROUP, IShare::TYPE_LINK, IShare::TYPE_REMOTE, IShare::TYPE_EMAIL];
-
-		foreach ($types as $type) {
-			try {
-				$provider = $this->factory->getProviderForType($type);
-			} catch (ProviderException $e) {
-				continue;
-			}
-			$provider->userDeleted($uid, $type);
-		}
-	}
-
-	/**
-	 * @inheritdoc
-	 */
-	public function groupDeleted($gid) {
-		$provider = $this->factory->getProviderForType(IShare::TYPE_GROUP);
-		$provider->groupDeleted($gid);
-
-		$excludedGroups = $this->config->getAppValue('core', 'shareapi_exclude_groups_list', '');
-		if ($excludedGroups === '') {
-			return;
-		}
-
-		$excludedGroups = json_decode($excludedGroups, true);
-		if (json_last_error() !== JSON_ERROR_NONE) {
-			return;
-		}
-
-		$excludedGroups = array_diff($excludedGroups, [$gid]);
-		$this->config->setAppValue('core', 'shareapi_exclude_groups_list', json_encode($excludedGroups));
-	}
-
-	/**
-	 * @inheritdoc
-	 */
-	public function userDeletedFromGroup($uid, $gid) {
-		$provider = $this->factory->getProviderForType(IShare::TYPE_GROUP);
-		$provider->userDeletedFromGroup($uid, $gid);
-	}
-
-	/**
-	 * Get access list to a path. This means
-	 * all the users that can access a given path.
-	 *
-	 * Consider:
-	 * -root
-	 * |-folder1 (23)
-	 *  |-folder2 (32)
-	 *   |-fileA (42)
-	 *
-	 * fileA is shared with user1 and user1@server1
-	 * folder2 is shared with group2 (user4 is a member of group2)
-	 * folder1 is shared with user2 (renamed to "folder (1)") and user2@server2
-	 *
-	 * Then the access list to '/folder1/folder2/fileA' with $currentAccess is:
-	 * [
-	 *  users  => [
-	 *      'user1' => ['node_id' => 42, 'node_path' => '/fileA'],
-	 *      'user4' => ['node_id' => 32, 'node_path' => '/folder2'],
-	 *      'user2' => ['node_id' => 23, 'node_path' => '/folder (1)'],
-	 *  ],
-	 *  remote => [
-	 *      'user1@server1' => ['node_id' => 42, 'token' => 'SeCr3t'],
-	 *      'user2@server2' => ['node_id' => 23, 'token' => 'FooBaR'],
-	 *  ],
-	 *  public => bool
-	 *  mail => bool
-	 * ]
-	 *
-	 * The access list to '/folder1/folder2/fileA' **without** $currentAccess is:
-	 * [
-	 *  users  => ['user1', 'user2', 'user4'],
-	 *  remote => bool,
-	 *  public => bool
-	 *  mail => bool
-	 * ]
-	 *
-	 * This is required for encryption/activity
-	 *
-	 * @param \OCP\Files\Node $path
-	 * @param bool $recursive Should we check all parent folders as well
-	 * @param bool $currentAccess Ensure the recipient has access to the file (e.g. did not unshare it)
-	 * @return array
-	 */
-	public function getAccessList(\OCP\Files\Node $path, $recursive = true, $currentAccess = false) {
-		$owner = $path->getOwner();
-
-		if ($owner === null) {
-			return [];
-		}
-
-		$owner = $owner->getUID();
-
-		if ($currentAccess) {
-			$al = ['users' => [], 'remote' => [], 'public' => false];
-		} else {
-			$al = ['users' => [], 'remote' => false, 'public' => false];
-		}
-		if (!$this->userManager->userExists($owner)) {
-			return $al;
-		}
-
-		//Get node for the owner and correct the owner in case of external storage
-		$userFolder = $this->rootFolder->getUserFolder($owner);
-		if ($path->getId() !== $userFolder->getId() && !$userFolder->isSubNode($path)) {
-			$nodes = $userFolder->getById($path->getId());
-			$path = array_shift($nodes);
-			if ($path === null || $path->getOwner() === null) {
-				return [];
-			}
-			$owner = $path->getOwner()->getUID();
-		}
-
-		$providers = $this->factory->getAllProviders();
-
-		/** @var Node[] $nodes */
-		$nodes = [];
-
-
-		if ($currentAccess) {
-			$ownerPath = $path->getPath();
-			$ownerPath = explode('/', $ownerPath, 4);
-			if (count($ownerPath) < 4) {
-				$ownerPath = '';
-			} else {
-				$ownerPath = $ownerPath[3];
-			}
-			$al['users'][$owner] = [
-				'node_id' => $path->getId(),
-				'node_path' => '/' . $ownerPath,
-			];
-		} else {
-			$al['users'][] = $owner;
-		}
-
-		// Collect all the shares
-		while ($path->getPath() !== $userFolder->getPath()) {
-			$nodes[] = $path;
-			if (!$recursive) {
-				break;
-			}
-			$path = $path->getParent();
-		}
-
-		foreach ($providers as $provider) {
-			$tmp = $provider->getAccessList($nodes, $currentAccess);
-
-			foreach ($tmp as $k => $v) {
-				if (isset($al[$k])) {
-					if (is_array($al[$k])) {
-						if ($currentAccess) {
-							$al[$k] += $v;
-						} else {
-							$al[$k] = array_merge($al[$k], $v);
-							$al[$k] = array_unique($al[$k]);
-							$al[$k] = array_values($al[$k]);
-						}
-					} else {
-						$al[$k] = $al[$k] || $v;
-					}
-				} else {
-					$al[$k] = $v;
-				}
-			}
-		}
-
-		return $al;
-	}
-
-	/**
-	 * Create a new share
-	 *
-	 * @return IShare
-	 */
-	public function newShare() {
-		return new \OC\Share20\Share($this->rootFolder, $this->userManager);
-	}
-
-	/**
-	 * Is the share API enabled
-	 *
-	 * @return bool
-	 */
-	public function shareApiEnabled() {
-		return $this->config->getAppValue('core', 'shareapi_enabled', 'yes') === 'yes';
-	}
-
-	/**
-	 * Is public link sharing enabled
-	 *
-	 * @return bool
-	 */
-	public function shareApiAllowLinks() {
-		if ($this->config->getAppValue('core', 'shareapi_allow_links', 'yes') !== 'yes') {
-			return false;
-		}
-
-		$user = $this->userSession->getUser();
-		if ($user) {
-			$excludedGroups = json_decode($this->config->getAppValue('core', 'shareapi_allow_links_exclude_groups', '[]'));
-			if ($excludedGroups) {
-				$userGroups = $this->groupManager->getUserGroupIds($user);
-				return !(bool)array_intersect($excludedGroups, $userGroups);
-			}
-		}
-
-		return true;
-	}
-
-	/**
-	 * Is password on public link requires
-	 *
-	 * @param bool Check group membership exclusion
-	 * @return bool
-	 */
-	public function shareApiLinkEnforcePassword(bool $checkGroupMembership = true) {
-		$excludedGroups = $this->config->getAppValue('core', 'shareapi_enforce_links_password_excluded_groups', '');
-		if ($excludedGroups !== '' && $checkGroupMembership) {
-			$excludedGroups = json_decode($excludedGroups);
-			$user = $this->userSession->getUser();
-			if ($user) {
-				$userGroups = $this->groupManager->getUserGroupIds($user);
-				if ((bool)array_intersect($excludedGroups, $userGroups)) {
-					return false;
-				}
-			}
-		}
-		return $this->config->getAppValue('core', 'shareapi_enforce_links_password', 'no') === 'yes';
-	}
-
-	/**
-	 * Is default link expire date enabled
-	 *
-	 * @return bool
-	 */
-	public function shareApiLinkDefaultExpireDate() {
-		return $this->config->getAppValue('core', 'shareapi_default_expire_date', 'no') === 'yes';
-	}
-
-	/**
-	 * Is default link expire date enforced
-	 *`
-	 *
-	 * @return bool
-	 */
-	public function shareApiLinkDefaultExpireDateEnforced() {
-		return $this->shareApiLinkDefaultExpireDate() &&
-			$this->config->getAppValue('core', 'shareapi_enforce_expire_date', 'no') === 'yes';
-	}
-
-
-	/**
-	 * Number of default link expire days
-	 *
-	 * @return int
-	 */
-	public function shareApiLinkDefaultExpireDays() {
-		return (int)$this->config->getAppValue('core', 'shareapi_expire_after_n_days', '7');
-	}
-
-	/**
-	 * Is default internal expire date enabled
-	 *
-	 * @return bool
-	 */
-	public function shareApiInternalDefaultExpireDate(): bool {
-		return $this->config->getAppValue('core', 'shareapi_default_internal_expire_date', 'no') === 'yes';
-	}
-
-	/**
-	 * Is default remote expire date enabled
-	 *
-	 * @return bool
-	 */
-	public function shareApiRemoteDefaultExpireDate(): bool {
-		return $this->config->getAppValue('core', 'shareapi_default_remote_expire_date', 'no') === 'yes';
-	}
-
-	/**
-	 * Is default expire date enforced
-	 *
-	 * @return bool
-	 */
-	public function shareApiInternalDefaultExpireDateEnforced(): bool {
-		return $this->shareApiInternalDefaultExpireDate() &&
-			$this->config->getAppValue('core', 'shareapi_enforce_internal_expire_date', 'no') === 'yes';
-	}
-
-	/**
-	 * Is default expire date enforced for remote shares
-	 *
-	 * @return bool
-	 */
-	public function shareApiRemoteDefaultExpireDateEnforced(): bool {
-		return $this->shareApiRemoteDefaultExpireDate() &&
-			$this->config->getAppValue('core', 'shareapi_enforce_remote_expire_date', 'no') === 'yes';
-	}
-
-	/**
-	 * Number of default expire days
-	 *
-	 * @return int
-	 */
-	public function shareApiInternalDefaultExpireDays(): int {
-		return (int)$this->config->getAppValue('core', 'shareapi_internal_expire_after_n_days', '7');
-	}
-
-	/**
-	 * Number of default expire days for remote shares
-	 *
-	 * @return int
-	 */
-	public function shareApiRemoteDefaultExpireDays(): int {
-		return (int)$this->config->getAppValue('core', 'shareapi_remote_expire_after_n_days', '7');
-	}
-
-	/**
-	 * Allow public upload on link shares
-	 *
-	 * @return bool
-	 */
-	public function shareApiLinkAllowPublicUpload() {
-		return $this->config->getAppValue('core', 'shareapi_allow_public_upload', 'yes') === 'yes';
-	}
-
-	/**
-	 * check if user can only share with group members
-	 *
-	 * @return bool
-	 */
-	public function shareWithGroupMembersOnly() {
-		return $this->config->getAppValue('core', 'shareapi_only_share_with_group_members', 'no') === 'yes';
-	}
-
-	/**
-	 * Check if users can share with groups
-	 *
-	 * @return bool
-	 */
-	public function allowGroupSharing() {
-		return $this->config->getAppValue('core', 'shareapi_allow_group_sharing', 'yes') === 'yes';
-	}
-
-	public function allowEnumeration(): bool {
-		return $this->config->getAppValue('core', 'shareapi_allow_share_dialog_user_enumeration', 'yes') === 'yes';
-	}
-
-	public function limitEnumerationToGroups(): bool {
-		return $this->allowEnumeration() &&
-			$this->config->getAppValue('core', 'shareapi_restrict_user_enumeration_to_group', 'no') === 'yes';
-	}
-
-	public function limitEnumerationToPhone(): bool {
-		return $this->allowEnumeration() &&
-			$this->config->getAppValue('core', 'shareapi_restrict_user_enumeration_to_phone', 'no') === 'yes';
-	}
-
-	public function allowEnumerationFullMatch(): bool {
-		return $this->config->getAppValue('core', 'shareapi_restrict_user_enumeration_full_match', 'yes') === 'yes';
-	}
-
-	public function matchEmail(): bool {
-		return $this->config->getAppValue('core', 'shareapi_restrict_user_enumeration_full_match_email', 'yes') === 'yes';
-	}
-
-	public function ignoreSecondDisplayName(): bool {
-		return $this->config->getAppValue('core', 'shareapi_restrict_user_enumeration_full_match_ignore_second_dn', 'no') === 'yes';
-	}
-
-	public function currentUserCanEnumerateTargetUser(?IUser $currentUser, IUser $targetUser): bool {
-		if ($this->allowEnumerationFullMatch()) {
-			return true;
-		}
-
-		if (!$this->allowEnumeration()) {
-			return false;
-		}
-
-		if (!$this->limitEnumerationToPhone() && !$this->limitEnumerationToGroups()) {
-			// Enumeration is enabled and not restricted: OK
-			return true;
-		}
-
-		if (!$currentUser instanceof IUser) {
-			// Enumeration restrictions require an account
-			return false;
-		}
-
-		// Enumeration is limited to phone match
-		if ($this->limitEnumerationToPhone() && $this->knownUserService->isKnownToUser($currentUser->getUID(), $targetUser->getUID())) {
-			return true;
-		}
-
-		// Enumeration is limited to groups
-		if ($this->limitEnumerationToGroups()) {
-			$currentUserGroupIds = $this->groupManager->getUserGroupIds($currentUser);
-			$targetUserGroupIds = $this->groupManager->getUserGroupIds($targetUser);
-			if (!empty(array_intersect($currentUserGroupIds, $targetUserGroupIds))) {
-				return true;
-			}
-		}
-
-		return false;
-	}
-
-	/**
-	 * Copied from \OC_Util::isSharingDisabledForUser
-	 *
-	 * TODO: Deprecate function from OC_Util
-	 *
-	 * @param string $userId
-	 * @return bool
-	 */
-	public function sharingDisabledForUser($userId) {
-		if ($userId === null) {
-			return false;
-		}
-
-		if (isset($this->sharingDisabledForUsersCache[$userId])) {
-			return $this->sharingDisabledForUsersCache[$userId];
-		}
-
-		if ($this->config->getAppValue('core', 'shareapi_exclude_groups', 'no') === 'yes') {
-			$groupsList = $this->config->getAppValue('core', 'shareapi_exclude_groups_list', '');
-			$excludedGroups = json_decode($groupsList);
-			if (is_null($excludedGroups)) {
-				$excludedGroups = explode(',', $groupsList);
-				$newValue = json_encode($excludedGroups);
-				$this->config->setAppValue('core', 'shareapi_exclude_groups_list', $newValue);
-			}
-			$user = $this->userManager->get($userId);
-			$usersGroups = $this->groupManager->getUserGroupIds($user);
-			if (!empty($usersGroups)) {
-				$remainingGroups = array_diff($usersGroups, $excludedGroups);
-				// if the user is only in groups which are disabled for sharing then
-				// sharing is also disabled for the user
-				if (empty($remainingGroups)) {
-					$this->sharingDisabledForUsersCache[$userId] = true;
-					return true;
-				}
-			}
-		}
-
-		$this->sharingDisabledForUsersCache[$userId] = false;
-		return false;
-	}
-
-	/**
-	 * @inheritdoc
-	 */
-	public function outgoingServer2ServerSharesAllowed() {
-		return $this->config->getAppValue('files_sharing', 'outgoing_server2server_share_enabled', 'yes') === 'yes';
-	}
-
-	/**
-	 * @inheritdoc
-	 */
-	public function outgoingServer2ServerGroupSharesAllowed() {
-		return $this->config->getAppValue('files_sharing', 'outgoing_server2server_group_share_enabled', 'no') === 'yes';
-	}
-
-	/**
-	 * @inheritdoc
-	 */
-	public function shareProviderExists($shareType) {
-		try {
-			$this->factory->getProviderForType($shareType);
-		} catch (ProviderException $e) {
-			return false;
-		}
-
-		return true;
-	}
-
-	public function registerShareProvider(string $shareProviderClass): void {
-		$this->factory->registerProvider($shareProviderClass);
-	}
-
-	public function getAllShares(): iterable {
-		$providers = $this->factory->getAllProviders();
-
-		foreach ($providers as $provider) {
-			yield from $provider->getAllShares();
-		}
-	}
+        if (($share->getShareType() === IShare::TYPE_LINK || $share->getShareType() === IShare::TYPE_EMAIL)
+            && $share->getNodeType() === 'folder' && !$this->shareApiLinkAllowPublicUpload()) {
+            $share->setPermissions($share->getPermissions() & ~(\OCP\Constants::PERMISSION_CREATE | \OCP\Constants::PERMISSION_UPDATE));
+        }
+
+        return $share;
+    }
+
+    protected function checkExpireDate($share) {
+        if ($share->isExpired()) {
+            $this->deleteShare($share);
+            throw new ShareNotFound($this->l->t('The requested share does not exist anymore'));
+        }
+    }
+
+    /**
+     * Verify the password of a public share
+     *
+     * @param IShare $share
+     * @param ?string $password
+     * @return bool
+     */
+    public function checkPassword(IShare $share, $password) {
+        $passwordProtected = $share->getShareType() !== IShare::TYPE_LINK
+            || $share->getShareType() !== IShare::TYPE_EMAIL
+            || $share->getShareType() !== IShare::TYPE_CIRCLE;
+        if (!$passwordProtected) {
+            //TODO maybe exception?
+            return false;
+        }
+
+        if ($password === null || $share->getPassword() === null) {
+            return false;
+        }
+
+        // Makes sure password hasn't expired
+        $expirationTime = $share->getPasswordExpirationTime();
+        if ($expirationTime !== null && $expirationTime < new \DateTime()) {
+            return false;
+        }
+
+        $newHash = '';
+        if (!$this->hasher->verify($password, $share->getPassword(), $newHash)) {
+            return false;
+        }
+
+        if (!empty($newHash)) {
+            $share->setPassword($newHash);
+            $provider = $this->factory->getProviderForType($share->getShareType());
+            $provider->update($share);
+        }
+
+        return true;
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function userDeleted($uid) {
+        $types = [IShare::TYPE_USER, IShare::TYPE_GROUP, IShare::TYPE_LINK, IShare::TYPE_REMOTE, IShare::TYPE_EMAIL];
+
+        foreach ($types as $type) {
+            try {
+                $provider = $this->factory->getProviderForType($type);
+            } catch (ProviderException $e) {
+                continue;
+            }
+            $provider->userDeleted($uid, $type);
+        }
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function groupDeleted($gid) {
+        $provider = $this->factory->getProviderForType(IShare::TYPE_GROUP);
+        $provider->groupDeleted($gid);
+
+        $excludedGroups = $this->config->getAppValue('core', 'shareapi_exclude_groups_list', '');
+        if ($excludedGroups === '') {
+            return;
+        }
+
+        $excludedGroups = json_decode($excludedGroups, true);
+        if (json_last_error() !== JSON_ERROR_NONE) {
+            return;
+        }
+
+        $excludedGroups = array_diff($excludedGroups, [$gid]);
+        $this->config->setAppValue('core', 'shareapi_exclude_groups_list', json_encode($excludedGroups));
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function userDeletedFromGroup($uid, $gid) {
+        $provider = $this->factory->getProviderForType(IShare::TYPE_GROUP);
+        $provider->userDeletedFromGroup($uid, $gid);
+    }
+
+    /**
+     * Get access list to a path. This means
+     * all the users that can access a given path.
+     *
+     * Consider:
+     * -root
+     * |-folder1 (23)
+     *  |-folder2 (32)
+     *   |-fileA (42)
+     *
+     * fileA is shared with user1 and user1@server1
+     * folder2 is shared with group2 (user4 is a member of group2)
+     * folder1 is shared with user2 (renamed to "folder (1)") and user2@server2
+     *
+     * Then the access list to '/folder1/folder2/fileA' with $currentAccess is:
+     * [
+     *  users  => [
+     *      'user1' => ['node_id' => 42, 'node_path' => '/fileA'],
+     *      'user4' => ['node_id' => 32, 'node_path' => '/folder2'],
+     *      'user2' => ['node_id' => 23, 'node_path' => '/folder (1)'],
+     *  ],
+     *  remote => [
+     *      'user1@server1' => ['node_id' => 42, 'token' => 'SeCr3t'],
+     *      'user2@server2' => ['node_id' => 23, 'token' => 'FooBaR'],
+     *  ],
+     *  public => bool
+     *  mail => bool
+     * ]
+     *
+     * The access list to '/folder1/folder2/fileA' **without** $currentAccess is:
+     * [
+     *  users  => ['user1', 'user2', 'user4'],
+     *  remote => bool,
+     *  public => bool
+     *  mail => bool
+     * ]
+     *
+     * This is required for encryption/activity
+     *
+     * @param \OCP\Files\Node $path
+     * @param bool $recursive Should we check all parent folders as well
+     * @param bool $currentAccess Ensure the recipient has access to the file (e.g. did not unshare it)
+     * @return array
+     */
+    public function getAccessList(\OCP\Files\Node $path, $recursive = true, $currentAccess = false) {
+        $owner = $path->getOwner();
+
+        if ($owner === null) {
+            return [];
+        }
+
+        $owner = $owner->getUID();
+
+        if ($currentAccess) {
+            $al = ['users' => [], 'remote' => [], 'public' => false];
+        } else {
+            $al = ['users' => [], 'remote' => false, 'public' => false];
+        }
+        if (!$this->userManager->userExists($owner)) {
+            return $al;
+        }
+
+        //Get node for the owner and correct the owner in case of external storage
+        $userFolder = $this->rootFolder->getUserFolder($owner);
+        if ($path->getId() !== $userFolder->getId() && !$userFolder->isSubNode($path)) {
+            $nodes = $userFolder->getById($path->getId());
+            $path = array_shift($nodes);
+            if ($path === null || $path->getOwner() === null) {
+                return [];
+            }
+            $owner = $path->getOwner()->getUID();
+        }
+
+        $providers = $this->factory->getAllProviders();
+
+        /** @var Node[] $nodes */
+        $nodes = [];
+
+
+        if ($currentAccess) {
+            $ownerPath = $path->getPath();
+            $ownerPath = explode('/', $ownerPath, 4);
+            if (count($ownerPath) < 4) {
+                $ownerPath = '';
+            } else {
+                $ownerPath = $ownerPath[3];
+            }
+            $al['users'][$owner] = [
+                'node_id' => $path->getId(),
+                'node_path' => '/' . $ownerPath,
+            ];
+        } else {
+            $al['users'][] = $owner;
+        }
+
+        // Collect all the shares
+        while ($path->getPath() !== $userFolder->getPath()) {
+            $nodes[] = $path;
+            if (!$recursive) {
+                break;
+            }
+            $path = $path->getParent();
+        }
+
+        foreach ($providers as $provider) {
+            $tmp = $provider->getAccessList($nodes, $currentAccess);
+
+            foreach ($tmp as $k => $v) {
+                if (isset($al[$k])) {
+                    if (is_array($al[$k])) {
+                        if ($currentAccess) {
+                            $al[$k] += $v;
+                        } else {
+                            $al[$k] = array_merge($al[$k], $v);
+                            $al[$k] = array_unique($al[$k]);
+                            $al[$k] = array_values($al[$k]);
+                        }
+                    } else {
+                        $al[$k] = $al[$k] || $v;
+                    }
+                } else {
+                    $al[$k] = $v;
+                }
+            }
+        }
+
+        return $al;
+    }
+
+    /**
+     * Create a new share
+     *
+     * @return IShare
+     */
+    public function newShare() {
+        return new \OC\Share20\Share($this->rootFolder, $this->userManager);
+    }
+
+    /**
+     * Is the share API enabled
+     *
+     * @return bool
+     */
+    public function shareApiEnabled() {
+        return $this->config->getAppValue('core', 'shareapi_enabled', 'yes') === 'yes';
+    }
+
+    /**
+     * Is public link sharing enabled
+     *
+     * @return bool
+     */
+    public function shareApiAllowLinks() {
+        if ($this->config->getAppValue('core', 'shareapi_allow_links', 'yes') !== 'yes') {
+            return false;
+        }
+
+        $user = $this->userSession->getUser();
+        if ($user) {
+            $excludedGroups = json_decode($this->config->getAppValue('core', 'shareapi_allow_links_exclude_groups', '[]'));
+            if ($excludedGroups) {
+                $userGroups = $this->groupManager->getUserGroupIds($user);
+                return !(bool)array_intersect($excludedGroups, $userGroups);
+            }
+        }
+
+        return true;
+    }
+
+    /**
+     * Is password on public link requires
+     *
+     * @param bool Check group membership exclusion
+     * @return bool
+     */
+    public function shareApiLinkEnforcePassword(bool $checkGroupMembership = true) {
+        $excludedGroups = $this->config->getAppValue('core', 'shareapi_enforce_links_password_excluded_groups', '');
+        if ($excludedGroups !== '' && $checkGroupMembership) {
+            $excludedGroups = json_decode($excludedGroups);
+            $user = $this->userSession->getUser();
+            if ($user) {
+                $userGroups = $this->groupManager->getUserGroupIds($user);
+                if ((bool)array_intersect($excludedGroups, $userGroups)) {
+                    return false;
+                }
+            }
+        }
+        return $this->config->getAppValue('core', 'shareapi_enforce_links_password', 'no') === 'yes';
+    }
+
+    /**
+     * Is default link expire date enabled
+     *
+     * @return bool
+     */
+    public function shareApiLinkDefaultExpireDate() {
+        return $this->config->getAppValue('core', 'shareapi_default_expire_date', 'no') === 'yes';
+    }
+
+    /**
+     * Is default link expire date enforced
+     *`
+     *
+     * @return bool
+     */
+    public function shareApiLinkDefaultExpireDateEnforced() {
+        return $this->shareApiLinkDefaultExpireDate() &&
+            $this->config->getAppValue('core', 'shareapi_enforce_expire_date', 'no') === 'yes';
+    }
+
+
+    /**
+     * Number of default link expire days
+     *
+     * @return int
+     */
+    public function shareApiLinkDefaultExpireDays() {
+        return (int)$this->config->getAppValue('core', 'shareapi_expire_after_n_days', '7');
+    }
+
+    /**
+     * Is default internal expire date enabled
+     *
+     * @return bool
+     */
+    public function shareApiInternalDefaultExpireDate(): bool {
+        return $this->config->getAppValue('core', 'shareapi_default_internal_expire_date', 'no') === 'yes';
+    }
+
+    /**
+     * Is default remote expire date enabled
+     *
+     * @return bool
+     */
+    public function shareApiRemoteDefaultExpireDate(): bool {
+        return $this->config->getAppValue('core', 'shareapi_default_remote_expire_date', 'no') === 'yes';
+    }
+
+    /**
+     * Is default expire date enforced
+     *
+     * @return bool
+     */
+    public function shareApiInternalDefaultExpireDateEnforced(): bool {
+        return $this->shareApiInternalDefaultExpireDate() &&
+            $this->config->getAppValue('core', 'shareapi_enforce_internal_expire_date', 'no') === 'yes';
+    }
+
+    /**
+     * Is default expire date enforced for remote shares
+     *
+     * @return bool
+     */
+    public function shareApiRemoteDefaultExpireDateEnforced(): bool {
+        return $this->shareApiRemoteDefaultExpireDate() &&
+            $this->config->getAppValue('core', 'shareapi_enforce_remote_expire_date', 'no') === 'yes';
+    }
+
+    /**
+     * Number of default expire days
+     *
+     * @return int
+     */
+    public function shareApiInternalDefaultExpireDays(): int {
+        return (int)$this->config->getAppValue('core', 'shareapi_internal_expire_after_n_days', '7');
+    }
+
+    /**
+     * Number of default expire days for remote shares
+     *
+     * @return int
+     */
+    public function shareApiRemoteDefaultExpireDays(): int {
+        return (int)$this->config->getAppValue('core', 'shareapi_remote_expire_after_n_days', '7');
+    }
+
+    /**
+     * Allow public upload on link shares
+     *
+     * @return bool
+     */
+    public function shareApiLinkAllowPublicUpload() {
+        return $this->config->getAppValue('core', 'shareapi_allow_public_upload', 'yes') === 'yes';
+    }
+
+    /**
+     * check if user can only share with group members
+     *
+     * @return bool
+     */
+    public function shareWithGroupMembersOnly() {
+        return $this->config->getAppValue('core', 'shareapi_only_share_with_group_members', 'no') === 'yes';
+    }
+
+    /**
+     * Check if users can share with groups
+     *
+     * @return bool
+     */
+    public function allowGroupSharing() {
+        return $this->config->getAppValue('core', 'shareapi_allow_group_sharing', 'yes') === 'yes';
+    }
+
+    public function allowEnumeration(): bool {
+        return $this->config->getAppValue('core', 'shareapi_allow_share_dialog_user_enumeration', 'yes') === 'yes';
+    }
+
+    public function limitEnumerationToGroups(): bool {
+        return $this->allowEnumeration() &&
+            $this->config->getAppValue('core', 'shareapi_restrict_user_enumeration_to_group', 'no') === 'yes';
+    }
+
+    public function limitEnumerationToPhone(): bool {
+        return $this->allowEnumeration() &&
+            $this->config->getAppValue('core', 'shareapi_restrict_user_enumeration_to_phone', 'no') === 'yes';
+    }
+
+    public function allowEnumerationFullMatch(): bool {
+        return $this->config->getAppValue('core', 'shareapi_restrict_user_enumeration_full_match', 'yes') === 'yes';
+    }
+
+    public function matchEmail(): bool {
+        return $this->config->getAppValue('core', 'shareapi_restrict_user_enumeration_full_match_email', 'yes') === 'yes';
+    }
+
+    public function ignoreSecondDisplayName(): bool {
+        return $this->config->getAppValue('core', 'shareapi_restrict_user_enumeration_full_match_ignore_second_dn', 'no') === 'yes';
+    }
+
+    public function currentUserCanEnumerateTargetUser(?IUser $currentUser, IUser $targetUser): bool {
+        if ($this->allowEnumerationFullMatch()) {
+            return true;
+        }
+
+        if (!$this->allowEnumeration()) {
+            return false;
+        }
+
+        if (!$this->limitEnumerationToPhone() && !$this->limitEnumerationToGroups()) {
+            // Enumeration is enabled and not restricted: OK
+            return true;
+        }
+
+        if (!$currentUser instanceof IUser) {
+            // Enumeration restrictions require an account
+            return false;
+        }
+
+        // Enumeration is limited to phone match
+        if ($this->limitEnumerationToPhone() && $this->knownUserService->isKnownToUser($currentUser->getUID(), $targetUser->getUID())) {
+            return true;
+        }
+
+        // Enumeration is limited to groups
+        if ($this->limitEnumerationToGroups()) {
+            $currentUserGroupIds = $this->groupManager->getUserGroupIds($currentUser);
+            $targetUserGroupIds = $this->groupManager->getUserGroupIds($targetUser);
+            if (!empty(array_intersect($currentUserGroupIds, $targetUserGroupIds))) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Copied from \OC_Util::isSharingDisabledForUser
+     *
+     * TODO: Deprecate function from OC_Util
+     *
+     * @param string $userId
+     * @return bool
+     */
+    public function sharingDisabledForUser($userId) {
+        if ($userId === null) {
+            return false;
+        }
+
+        if (isset($this->sharingDisabledForUsersCache[$userId])) {
+            return $this->sharingDisabledForUsersCache[$userId];
+        }
+
+        if ($this->config->getAppValue('core', 'shareapi_exclude_groups', 'no') === 'yes') {
+            $groupsList = $this->config->getAppValue('core', 'shareapi_exclude_groups_list', '');
+            $excludedGroups = json_decode($groupsList);
+            if (is_null($excludedGroups)) {
+                $excludedGroups = explode(',', $groupsList);
+                $newValue = json_encode($excludedGroups);
+                $this->config->setAppValue('core', 'shareapi_exclude_groups_list', $newValue);
+            }
+            $user = $this->userManager->get($userId);
+            $usersGroups = $this->groupManager->getUserGroupIds($user);
+            if (!empty($usersGroups)) {
+                $remainingGroups = array_diff($usersGroups, $excludedGroups);
+                // if the user is only in groups which are disabled for sharing then
+                // sharing is also disabled for the user
+                if (empty($remainingGroups)) {
+                    $this->sharingDisabledForUsersCache[$userId] = true;
+                    return true;
+                }
+            }
+        }
+
+        $this->sharingDisabledForUsersCache[$userId] = false;
+        return false;
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function outgoingServer2ServerSharesAllowed() {
+        return $this->config->getAppValue('files_sharing', 'outgoing_server2server_share_enabled', 'yes') === 'yes';
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function outgoingServer2ServerGroupSharesAllowed() {
+        return $this->config->getAppValue('files_sharing', 'outgoing_server2server_group_share_enabled', 'no') === 'yes';
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function shareProviderExists($shareType) {
+        try {
+            $this->factory->getProviderForType($shareType);
+        } catch (ProviderException $e) {
+            return false;
+        }
+
+        return true;
+    }
+
+    public function registerShareProvider(string $shareProviderClass): void {
+        $this->factory->registerProvider($shareProviderClass);
+    }
+
+    public function getAllShares(): iterable {
+        $providers = $this->factory->getAllProviders();
+
+        foreach ($providers as $provider) {
+            yield from $provider->getAllShares();
+        }
+    }
 }