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import org.joget.apps.workflow.security.WorkflowUserDetails;
import org.joget.directory.model.service.DirectoryManager;
import org.joget.workflow.model.service.WorkflowUserManager;
import org.joget.apps.app.service.AppUtil;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.joget.directory.model.User;
import org.joget.workflow.util.WorkflowUtil;
import org.springframework.security.core.context.SecurityContextHolder;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpServletRequest;
import org.springframework.security.web.savedrequest.HttpSessionRequestCache;
import org.springframework.security.web.savedrequest.SavedRequest;
 
//Get service beans
DirectoryManager dm = (DirectoryManager) AppUtil.getApplicationContext().getBean("directoryManager");
WorkflowUserManager workflowUserManager = (WorkflowUserManager) AppUtil.getApplicationContext().getBean("workflowUserManager");
 
//Login as "clark"
String username = "clark"; 
User user = dm.getUserByUsername(username);

if (user != null) {
    WorkflowUserDetails userDetail = new WorkflowUserDetails(user);
 
    //Generate an authentication token without a password
    AuthenticationUsernamePasswordAuthenticationToken auth = new UsernamePasswordAuthenticationToken(userDetail, userDetail.getUsername(), "", userDetail.getAuthorities());
     auth.setDetails(userDetail);
    //Login the user
    SecurityContextHolder.getContext().setAuthentication(auth);
    workflowUserManager.setCurrentThreadUser(user.getUsername());

    // generate new session to avoid session fixation vulnerability
    HttpServletRequest httpRequest = WorkflowUtil.getHttpServletRequest();
    HttpSession session = httpRequest.getSession(false);
    if (session != null) {
        SavedRequest savedRequest = (SavedRequest) session.getAttribute("SPRING_SECURITY_SAVED_REQUEST_KEY");
        session.invalidate();
        session = httpRequest.getSession(true);
        if (savedRequest != null) {
            session.setAttribute("SPRING_SECURITY_SAVED_REQUEST_KEY", savedRequest);
        }
    }
}