feat(uac): add multi user management and UAC (#647)

app/services/userService.js

@@ -0,0 +1,48 @@
+angular.module('portainer.services')
+.factory('UserService', ['$q', 'Users', function UserServiceFactory($q, Users) {
+  'use strict';
+  var service = {};
+  service.users = function() {
+    return Users.query({}).$promise;
+  };
+
+  service.user = function(id) {
+    return Users.get({id: id}).$promise;
+  };
+
+  service.createUser = function(username, password, role) {
+    return Users.create({}, {username: username, password: password, role: role}).$promise;
+  };
+
+  service.deleteUser = function(id) {
+    return Users.remove({id: id}).$promise;
+  };
+
+  service.updateUser = function(id, password, role) {
+    var query = {
+      password: password,
+      role: role
+    };
+    return Users.update({id: id}, query).$promise;
+  };
+
+  service.updateUserPassword = function(id, currentPassword, newPassword) {
+    var deferred = $q.defer();
+    Users.checkPassword({id: id}, {password: currentPassword}).$promise
+    .then(function success(data) {
+      if (!data.valid) {
+        deferred.reject({invalidPassword: true});
+      }
+      return service.updateUser(id, newPassword, undefined);
+    })
+    .then(function success(data) {
+      deferred.resolve();
+    })
+    .catch(function error(err) {
+      deferred.reject({msg: 'Unable to update user password', err: err});
+    });
+    return deferred.promise;
+  };
+
+  return service;
+}]);