Spring MVC Role and Permission to Admin

Question

I am new in spring mvc , In my existing project , there is one admin and they have rights to update data , but now i need to create 2 new admin , admin1 and admin2 that can

Answer 1

I had a similar use-case, where the admins might want to create new roles, with arbitrarily assigned permissions to these roles.

If I were to authorize users on the existence of a ROLE_* in their granted authorities, then the code would need to change every time someone adds a new role, or the business requirements for that role changes.

Like @Ralph, I created a library to inject mapped authorities based on Role to Permissions because I found the hierarchical role implementation lacking...

When an Authentication object is injected in the current security session, it will have the original roles/granted authorities. You can provide map the permissions in your UserDetailsService, or JWT Authentication Converter for instance.

The PermissionProvider is called to get the effective permissions for each role the user is a member of. The distinct list of permissions are added as GrantedAuthority items in the Authentication object.

Then I can use permission level authorization in the configuration, and the role to permission mapping can change at runtime.

Concept -

ADMIN1 -> PERM_ADD, PERM_POST
ADMIN2 -> PERM_POST, PERM_UPDATE

Implementation example -

@Autowired 
RolePermissionsRepository repository;

public void setup1(){
  String roleName = "ROLE_ADMIN1";
  List permissions = new ArrayList();
  permissions.add("PERM_ADD");
  permissions.add("PERM_POST");
  repository.save(new RolePermissions(roleName, permissions));
} 

public void setup2(){
  String roleName = "ROLE_ADMIN2";
  List permissions = new ArrayList();
  permissions.add("PERM_UPDATE");
  permissions.add("PERM_POST");
  repository.save(new RolePermissions(roleName, permissions));
}

Then use the permissions for access instead of roles.

Or using the authorization annotations -

@PreAuthorize("hasAuthority('PERM_ADD')")
@RequestMapping("/add")
public String add() {
  ...
}

For the source code, see here - https://github.com/savantly-net/spring-role-permissions