Expose backend type via REST API

This change will expose the user backend via the REST API which is a pre-requisite for https://github.com/owncloud/core/issues/12620.

For example:
````json
[{"name":"9707A09E-CA9A-4ABE-A66A-3F632F16C409","displayname":"Document Conversion User Account","groups":[],"subadmin":[],"quota":"default","storageLocation":"\/Users\/lreschke\/Programming\/core\/data\/9707A09E-CA9A-4ABE-A66A-3F632F16C409","lastLogin":0,"backend":"OCA\\user_ldap\\USER_LDAP"},{"name":"ED86733E-745C-4E4D-90CB-278A9737DB3C","displayname":"Hacker","groups":[],"subadmin":[],"quota":"default","storageLocation":"\/Users\/lreschke\/Programming\/core\/data\/ED86733E-745C-4E4D-90CB-278A9737DB3C","lastLogin":0,"backend":"OCA\\user_ldap\\USER_LDAP"},{"name":"71CDF45B-E125-450D-983C-D9192F36EC88","displayname":"admin","groups":[],"subadmin":[],"quota":"default","storageLocation":"\/Users\/lreschke\/Programming\/core\/data\/71CDF45B-E125-450D-983C-D9192F36EC88","lastLogin":0,"backend":"OCA\\user_ldap\\USER_LDAP"},{"name":"admin","displayname":"admin","groups":["admin"],"subadmin":[],"quota":"default","storageLocation":"\/Users\/lreschke\/Programming\/core\/data\/admin","lastLogin":"1418057287","backend":"OC_User_Database"},{"name":"test","displayname":"test","groups":[],"subadmin":[],"quota":"default","storageLocation":"\/Users\/lreschke\/Programming\/core\/data\/test","lastLogin":0,"backend":"OC_User_Database"}]
```

2 files changed, 52 insertions, 51 deletions

diff --git a/settings/controller/userscontroller.php b/settings/controller/userscontroller.php
index 5bd4b555106..589b0a888cb 100644
--- a/settings/controller/userscontroller.php
+++ b/settings/controller/userscontroller.php
@@ -18,6 +18,7 @@ use OCP\IConfig;
 use OCP\IGroupManager;
 use OCP\IL10N;
 use OCP\IRequest;
+use OCP\IUser;
 use OCP\IUserManager;
 use OCP\IUserSession;
 
@@ -66,8 +67,26 @@ class UsersController extends Controller {
 	}
 
 	/**
+	 * @param IUser $user
+	 * @param array $userGroups
+	 * @return array
+	 */
+	private function formatUserForIndex(IUser $user, array $userGroups = null) {
+		return array(
+			'name' => $user->getUID(),
+			'displayname' => $user->getDisplayName(),
+			'groups' => (empty($userGroups)) ? $this->groupManager->getUserGroupIds($user) : $userGroups,
+			'subadmin' => \OC_SubAdmin::getSubAdminsGroups($user->getUID()),
+			'quota' => $this->config->getUserValue($user->getUID(), 'files', 'quota', 'default'),
+			'storageLocation' => $user->getHome(),
+			'lastLogin' => $user->getLastLogin(),
+			'backend' => $user->getBackendClassName()
+		);
+	}
+
+	/**
 	 * @NoAdminRequired
-	 * @NoCSRFRequired
+	 *
 	 * @param int $offset
 	 * @param int $limit
 	 * @param string $gid
@@ -91,16 +110,7 @@ class UsersController extends Controller {
 			}
 
 			foreach ($batch as $uid => $displayname) {
-				$user = $this->userManager->get($uid);
-				$users[] = array(
-					'name' => $uid,
-					'displayname' => $displayname,
-					'groups' => $this->groupManager->getUserGroupIds($user),
-					'subadmin' => \OC_SubAdmin::getSubAdminsGroups($uid),
-					'quota' => $this->config->getUserValue($uid, 'files', 'quota', 'default'),
-					'storageLocation' => $user->getHome(),
-					'lastLogin' => $user->getLastLogin(),
-				);
+				$users[] = $this->formatUserForIndex($this->userManager->get($uid));
 			}
 		} else {
 			$groups = \OC_SubAdmin::getSubAdminsGroups($this->userSession->getUser()->getUID());
@@ -115,20 +125,13 @@ class UsersController extends Controller {
 				$user = $this->userManager->get($uid);
 
 				// Only add the groups, this user is a subadmin of
-				$userGroups = array_intersect($this->groupManager->getUserGroupIds($user), \OC_SubAdmin::getSubAdminsGroups($this->userSession->getUser()->getUID()));
-				$users[] = array(
-					'name' => $uid,
-					'displayname' => $user->getDisplayName(),
-					'groups' => $userGroups,
-					'quota' => $this->config->getUserValue($uid, 'files', 'quota', 'default'),
-					'storageLocation' => $user->getHome(),
-					'lastLogin' => $user->getLastLogin(),
-				);
+				$userGroups = array_intersect($this->groupManager->getUserGroupIds($user),
+					\OC_SubAdmin::getSubAdminsGroups($this->userSession->getUser()->getUID()));
+				$users[] = $this->formatUserForIndex($user, $userGroups);
 			}
 		}
 
-		// FIXME: That assignment on "data" is uneeded here - JS should be adjusted
-		return new DataResponse(array('data' => $users, 'status' => 'success'));
+		return new DataResponse($users);
 	}
 
 	/**
@@ -142,7 +145,7 @@ class UsersController extends Controller {
 	 * TODO: Tidy up and write unit tests - code is mainly static method calls
 	 */
 	public function create($username, $password, array $groups) {
-		
+
 		if (!$this->isAdmin) {
 			if (!empty($groups)) {
 				foreach ($groups as $key => $group) {
@@ -247,7 +250,6 @@ class UsersController extends Controller {
 			),
 			Http::STATUS_FORBIDDEN
 		);
-
 	}
 
 }
diff --git a/settings/js/users/users.js b/settings/js/users/users.js
index 1bca6d06b33..9c48da32c5a 100644
--- a/settings/js/users/users.js
+++ b/settings/js/users/users.js
@@ -331,35 +331,34 @@ var UserList = {
 			function (result) {
 				var loadedUsers = 0;
 				var trs = [];
-				if (result.status === 'success') {
-					//The offset does not mirror the amount of users available,
-					//because it is backend-dependent. For correct retrieval,
-					//always the limit(requested amount of users) needs to be added.
-					$.each(result.data, function (index, user) {
-						if(UserList.has(user.name)) {
-							return true;
-						}
-						var $tr = UserList.add(user.name, user.displayname, user.groups, user.subadmin, user.quota, user.storageLocation, user.lastLogin, false);
-						$tr.addClass('appear transparent');
-						trs.push($tr);
-						loadedUsers++;
-					});
-					if (result.data.length > 0) {
-						UserList.doSort();
-						$userList.siblings('.loading').css('visibility', 'hidden');
-					}
-					else {
-						UserList.noMoreEntries = true;
-						$userList.siblings('.loading').remove();
+				//The offset does not mirror the amount of users available,
+				//because it is backend-dependent. For correct retrieval,
+				//always the limit(requested amount of users) needs to be added.
+				$.each(result, function (index, user) {
+					if(UserList.has(user.name)) {
+						return true;
 					}
-					UserList.offset += loadedUsers;
-					// animate
-					setTimeout(function() {
-						for (var i = 0; i < trs.length; i++) {
-							trs[i].removeClass('transparent');
-						}
-					}, 0);
+					var $tr = UserList.add(user.name, user.displayname, user.groups, user.subadmin, user.quota, user.storageLocation, user.lastLogin, false);
+					$tr.addClass('appear transparent');
+					trs.push($tr);
+					loadedUsers++;
+				});
+				if (result.length > 0) {
+					UserList.doSort();
+					$userList.siblings('.loading').css('visibility', 'hidden');
 				}
+				else {
+					UserList.noMoreEntries = true;
+					$userList.siblings('.loading').remove();
+				}
+				UserList.offset += loadedUsers;
+				// animate
+				setTimeout(function() {
+					for (var i = 0; i < trs.length; i++) {
+						trs[i].removeClass('transparent');
+					}
+				}, 0);
+			}).always(function() {
 				UserList.updating = false;
 			});
 	},