Simple mockup of Angularjs user authentication service/factory

Angular $AuthService Factory - Mockup

.factory('$authservice', ['$window', '$localstorage', '$state', function($window, $localstorage, $state) {
    // Access local storage for existing user info
    var SHIFT = $localstorage.getObject("Shift")
        // Does session exist?
    if (SHIFT && SHIFT.session.token) {
        console.log("$authservice: Existing Session found: ", [SHIFT])
    } else {
        console.log("$authservice: No session found.")
        SHIFT = {
            session: {
                token: null
            },
            user: {
                isAuthenticated: false
            },
        }
        $localstorage.setObject("Shift", SHIFT);
        // $state.go("login");
    }

    return {
        isAuthenticated: function() {
            if (SHIFT.user.isAuthenticated) {
                // console.log("User is authenticated.")
                return true;
            } else {
                // console.log("User is NOT authenticated.")
                return false;
            }

        },
        login: function(username, password) {
            if (username === "a@a.com" && password === "111") {
                SHIFT = {
                    session: {
                        token: "6677v7b8vddtvdd8s7dff6sf5d74fdf76v9cv7ds98xf76d8sx5f67s8d9cuc89ds67d8",
                        expire: "Jan 1, 2017"
                    },
                    user: {
                        isAuthenticated: true
                    },
                }
                $localstorage.setObject("Shift", SHIFT);
                return SHIFT;
            } else {
                return false;
            }
        },
        logout: function() {
            SHIFT = {
                session: {
                    token: null
                },
                user: {
                    isAuthenticated: false
                },
            }
            $localstorage.setObject("Shift", SHIFT);
            $state.go("login");
        }
    }
}])