Instance based login in spring security core

Spring security loads the roles of user from user role table based on all roles assigned to user and that role is application specific.
But In my project i require to assign roles to user based on instance . So when the instance is changed roles should be changed .In grails we can overide the methods of plugin. So when instance change i reauthenticate the user and overrided the “loadAuthorities ” method of spring security. So instead of fetching roles from spring security loadAuthorities method , it loads from this overided loadAuthorities method…

[java]
class UserRole implements Serializable {

User user
Role role
BootCamp bootCamp

[/java]

[java]
class CustomUserDetailsService extends GormUserDetailsService {

@Override
protected Collection loadAuthorities(user, String username, boolean loadRoles) {
if (!loadRoles) {
return []
}
def conf = SpringSecurityUtils.securityConfig
String authoritiesPropertyName = conf.userLookup.authoritiesPropertyName
String authorityPropertyName = conf.authority.nameField
Bootcamp bootCamp=BootCamp.get(RequestContextHolder.currentRequestAttributes().getSession()?.bootCampId))
User loggedInUser = User.findByEmail(username)
//Write your query for loading roles here for ex.

Collection<?> userAuthorities =UserRole.findAllByUserAndBootCamp(loggedInUser, bootCamp)?.role

def authorities = userAuthorities.collect { new GrantedAuthorityImpl(it."$authorityPropertyName") }
authorities ?: NO_ROLES
}
}
[/java]

for example i am reloading the role by calling this method…
[java]
def getAuthoritiesBasedOnBootCamp() {
session.bootCampId = params.bootCampId
springSecurityService.reauthenticate(User.loggedInUser.email, "")
redirect(action: ‘dashBoard’)
}

[/java]

Shaurav@intelligrape.com