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diff --git a/apps/files_external/lib/permissionstrait.php b/apps/files_external/lib/permissionstrait.php
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+++ b/apps/files_external/lib/permissionstrait.php
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+<?php
+/**
+ * @author Robin McCorkell <rmccorkell@karoshi.org.uk>
+ *
+ * @copyright Copyright (c) 2015, ownCloud, Inc.
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License, version 3,
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+namespace OCA\Files_External\Lib;
+
+use \OCA\Files_External\Service\BackendService;
+
+/**
+ * Trait to implement backend and auth mechanism permissions
+ *
+ * For user type constants, see BackendService::USER_*
+ * For permission constants, see BackendService::PERMISSION_*
+ */
+trait PermissionsTrait {
+
+	/** @var array [user type => permissions] */
+	protected $permissions = [
+		BackendService::USER_PERSONAL => BackendService::PERMISSION_DEFAULT,
+		BackendService::USER_ADMIN => BackendService::PERMISSION_DEFAULT,
+	];
+
+	/** @var array [user type => allowed permissions] */
+	protected $allowedPermissions = [
+		BackendService::USER_PERSONAL => BackendService::PERMISSION_DEFAULT,
+		BackendService::USER_ADMIN => BackendService::PERMISSION_DEFAULT,
+	];
+
+	/**
+	 * @param string $userType
+	 * @return int
+	 */
+	public function getPermissions($userType) {
+		if (isset($this->permissions[$userType])) {
+			return $this->permissions[$userType];
+		}
+		return BackendService::PERMISSION_NONE;
+	}
+
+	/**
+	 * Check if the user type has permission
+	 *
+	 * @param string $userType
+	 * @param int $permission
+	 * @return bool
+	 */
+	public function isPermitted($userType, $permission) {
+		if ($this->getPermissions($userType) & $permission) {
+			return true;
+		}
+		return false;
+	}
+
+	/**
+	 * @param string $userType
+	 * @param int $permissions
+	 * @return self
+	 */
+	public function setPermissions($userType, $permissions) {
+		$this->permissions[$userType] = $permissions;
+		$this->allowedPermissions[$userType] =
+			$this->getAllowedPermissions($userType) | $permissions;
+		return $this;
+	}
+
+	/**
+	 * @param string $userType
+	 * @param int $permission
+	 * @return self
+	 */
+	public function addPermission($userType, $permission) {
+		return $this->setPermissions($userType,
+			$this->getPermissions($userType) | $permission
+		);
+	}
+
+	/**
+	 * @param string $userType
+	 * @param int $permission
+	 * @return self
+	 */
+	public function removePermission($userType, $permission) {
+		return $this->setPermissions($userType,
+			$this->getPermissions($userType) & ~$permission
+		);
+	}
+
+	/**
+	 * @param string $userType
+	 * @return int
+	 */
+	public function getAllowedPermissions($userType) {
+		if (isset($this->allowedPermissions[$userType])) {
+			return $this->allowedPermissions[$userType];
+		}
+		return BackendService::PERMISSION_NONE;
+	}
+
+	/**
+	 * Check if the user type has an allowed permission
+	 *
+	 * @param string $userType
+	 * @param int $permission
+	 * @return bool
+	 */
+	public function isAllowedPermitted($userType, $permission) {
+		if ($this->getAllowedPermissions($userType) & $permission) {
+			return true;
+		}
+		return false;
+	}
+
+	/**
+	 * @param string $userType
+	 * @param int $permissions
+	 * @return self
+	 */
+	public function setAllowedPermissions($userType, $permissions) {
+		$this->allowedPermissions[$userType] = $permissions;
+		$this->permissions[$userType] =
+			$this->getPermissions($userType) & $permissions;
+		return $this;
+	}
+
+	/**
+	 * @param string $userType
+	 * @param int $permission
+	 * @return self
+	 */
+	public function addAllowedPermission($userType, $permission) {
+		return $this->setAllowedPermissions($userType,
+			$this->getAllowedPermissions($userType) | $permission
+		);
+	}
+
+	/**
+	 * @param string $userType
+	 * @param int $permission
+	 * @return self
+	 */
+	public function removeAllowedPermission($userType, $permission) {
+		return $this->setAllowedPermissions($userType,
+			$this->getAllowedPermissions($userType) & ~$permission
+		);
+	}
+
+}