obtain user groups of the current user programatically.

Hi, 

Something like this should work:

References:

https://experienceleaguecommunities.adobe.com/t5/adobe-experience-manager/get-the-users-from-aem-group/m-p/418283

https://experienceleaguecommunities.adobe.com/t5/adobe-experience-manager/how-to-fetch-users-of-a-group-through-java-code/m-p/168443 

Hope this helps

@estebanbustamante has already written a nice code snip to help but would still like you to go through the original interface documentation at Interface Authorizable and Interface UserManager

Authorizable authorizable = resolver.adaptTo(Authorizable.class);
if (authorizable != null) {
 GroupMembership groupMembership = authorizable.getGroupMembership();
 List < String > groups = new ArrayList < > ();
 Iterator < Authorizable > groupIter = groupMembership.iterator();
 while (groupIter.hasNext()) {
  groups.add(groupIter.next().getID());
 }
 response.getWriter().write("User groups: " + groups.toString());
}

You can also get the list of groups for a given username using the below OTB servlet - 

Use a GET request to the following endpoint, replacing {username} with the actual username:

http://{aem_instance}:4502/bin/user/{username}/groups

Hope this helps!

by passing the userid to this method, you can get all the uaergroups for that user id:

import org.apache.jackrabbit.api.security.user.Authorizable;
import org.apache.jackrabbit.api.security.user.Group;
import org.apache.jackrabbit.api.security.user.User;
import org.apache.jackrabbit.api.security.user.UserManager;
import org.apache.sling.api.resource.ResourceResolver;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

public Map<String, String> getAllUserGroups(String userId, ResourceResolver resourceResolver) {
Map<String, String> userGroups = new HashMap<>();
try {
UserManager userManager = resourceResolver.adaptTo(UserManager.class);
if (userManager != null) {
Authorizable authorizable = userManager.getAuthorizable(userId);
if (authorizable instanceof User) {
Iterator<Group> groups = ((User) authorizable).memberOf();
while (groups.hasNext()) {
Group group = groups.next();
userGroups.put(group.getID(), group.getProperty("./profile/givenName")[0].getString());
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
return userGroups;
}

-Get the UserManager instance from the ResourceResolver.
-Use the UserManager to get the Authorizable object for the user.
-Check if the Authorizable is a User.
-If it is a User, get the groups it is a member of.