Introduce BackendService for managing external storage backends

Backends are registered to the BackendService through new data
structures:

Backends are concrete classes, deriving from
\OCA\Files_External\Lib\Backend\Backend. During construction, the
various configuration parameters of the Backend can be set, in a design
similar to Symfony Console.

DefinitionParameter stores a parameter configuration for an external
storage: name of parameter, human-readable name, type of parameter
(text, password, hidden, checkbox), flags (optional or not).

Storages in the StoragesController now get their parameters validated
server-side (fixes a TODO).

1 files changed, 64 insertions, 0 deletions

diff --git a/apps/files_external/lib/missingdependency.php b/apps/files_external/lib/missingdependency.php
new file mode 100644
index 00000000000..9b25aeacc9b
--- /dev/null
+++ b/apps/files_external/lib/missingdependency.php
@@ -0,0 +1,64 @@
+<?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;
+
+/**
+ * External storage backend dependency
+ */
+class MissingDependency {
+
+	/** @var string */
+	private $dependency;
+
+	/** @var string|null Custom message */
+	private $message = null;
+
+	/**
+	 * @param string $dependency
+	 */
+	public function __construct($dependency) {
+		$this->dependency = $dependency;
+	}
+
+	/**
+	 * @return string
+	 */
+	public function getDependency() {
+		return $this->dependency;
+	}
+
+	/**
+	 * @return string|null
+	 */
+	public function getMessage() {
+		return $this->message;
+	}
+
+	/**
+	 * @param string $message
+	 * @return self
+	 */
+	public function setMessage($message) {
+		$this->message = $message;
+		return $this;
+	}
+}