make share folder configurable

apps/files_sharing/appinfo/update.php

 			$query->execute(array());
 		}
 
+		// set config to keep the Shared folder as the default location for new shares
+		\OCA\Files_Sharing\Helper::setShareFolder('/Shared');
+
 	}
 }

apps/files_sharing/lib/helper.php

 		return ($result === 'yes') ? true : false;
 	}
 
+	/**
+	 * get default share folder
+	 *
+	 * @return string
+	 */
+	public static function getShareFolder() {
+		$shareFolder = \OCP\Config::getSystemValue('share_folder', '/');
+
+		return \OC\Files\Filesystem::normalizePath($shareFolder);
+	}
+
+	/**
+	 * set default share folder
+	 *
+	 * @param string $shareFolder
+	 */
+	public static function setShareFolder($shareFolder) {
+		\OCP\Config::setSystemValue('share_folder', $shareFolder);
+	}
+
 }

apps/files_sharing/lib/share/file.php

 	 * @return string
 	 */
 	public function generateTarget($filePath, $shareWith, $exclude = null) {
-		$target = '/'.basename($filePath);
+		$shareFolder = \OCA\Files_Sharing\Helper::getShareFolder();
+		$target = \OC\Files\Filesystem::normalizePath($shareFolder . '/' . basename($filePath));
 
 		// for group shares we return the target right away
 		if ($shareWith === false) {
 
 		\OC\Files\Filesystem::initMountPoints($shareWith);
 		$view = new \OC\Files\View('/' . $shareWith . '/files');
+
+		if (!$view->is_dir($shareFolder)) {
+			$dir = '';
+			$subdirs = explode('/', $shareFolder);
+			foreach ($subdirs as $subdir) {
+				$dir = $dir . '/' . $subdir;
+				if (!$view->is_dir($dir)) {
+					$view->mkdir($dir);
+				}
+			}
+		}
+
 		$excludeList = \OCP\Share::getItemsSharedWithUser('file', $shareWith, self::FORMAT_TARGET_NAMES);
 		if (is_array($exclude)) {
 			$excludeList = array_merge($excludeList, $exclude);

config/config.sample.php

 	),
 ),
 
+/**
+ * define default folder for shared files and folders
+ */
+'share_folder' => '/',
+
 );