Grails controller's beforeInterceptor - grails

Question

I am trying to make it so that no matter what function of my controller is accessed, if the session has been nulled, it goes back to the log in page after you click ok on a modal that pops up saying the session has expired but I can't quite get it to work. Here are the first few methods of this controller:
def beforeInterceptor = {
[action:this.&checkSession()]
}
def checkSession() {
if (!session.user) {
render text: """<script type="text/javascript"> alert('Session expired. Please log in again.'); window.location.href = data.url;</script>""",
contentType: 'js'
}
}
def index() {
redirect (action: customerLogin)
}
def customerLogin = {
selectedBatch = null
}
def authenticate = {
def user = null
def possibleUsersList = User.findAllWhere(user_name: params.username)
possibleUsersList.each {
if (bcryptService.checkPassword(params.password, it.user_password))
user = it
}
if (user) {
session.user = user
greetingName = user.user_name
render(contentType: 'text/json') {
[success: true, url: createLink(controller: 'customer', action: 'custMainPage')]
}
}
else {
//def messages = ResourceBundle.getBundle('messages')
//def errorstring = bundle.getString("fatcaone.login.error")
//println "Login error: " + ${errorstring}
render (contentType: 'text/json') {
//["message": '<p>code=fatcaone.login.error</p>']
["message": '<p>Login or Password incorrect.</p>']
}
}
}
def logout = {
if (session.user != null) {
flash.message = "Goodbye ${session.user.fullName}"
session.user = null
}
redirect(action: customerLogin)
}

Answer 1

beforeInterceptor has been removed from Grails 3.0.
See https://github.com/grails/grails-core/issues/635 for a discussion of this.

Answer 2

Given that you want to keep your code as it is do:
def beforeInterceptor = {
[action:this.&checkSession()]
}
private def checkSession() {
if (!session.user) {
flash.error = 'Session expired. Please log in again.'
redirect(action: customerLogin)
return false
}
}
def index() {
redirect (action: customerLogin)
}
def customerLogin = {
selectedBatch = null
}
def authenticate = {
def user = null
def possibleUsersList = User.findAllWhere(user_name: params.username)
possibleUsersList.each {
if (bcryptService.checkPassword(params.password, it.user_password))
user = it
}
if (user) {
session.user = user
greetingName = user.user_name
render(contentType: 'text/json') {
[success: true, url: createLink(controller: 'customer', action: 'custMainPage')]
}
}
else {
//def messages = ResourceBundle.getBundle('messages')
//def errorstring = bundle.getString("fatcaone.login.error")
//println "Login error: " + ${errorstring}
render (contentType: 'text/json') {
//["message": '<p>code=fatcaone.login.error</p>']
["message": '<p>Login or Password incorrect.</p>']
}
}
}
def logout = {
if (session.user != null) {
flash.message = "Goodbye ${session.user.fullName}"
session.user = null
}
redirect(action: customerLogin)
}
And in your login page add:
<g:if test="${flash.error}">
<script type="text/javascript">
alert('${flash.error}');
</script>
</g:if>

Answer 3

Check this
def checkSession() {
if (session == null || session["loginId"] == null) {
render text: """<script type="text/javascript"> alert('Session expired. Please log in again.'); window.location.href = "${createLink(controller: 'test',action: 'logout')}";</script>""",
contentType: 'js';
return false;
}
}