Added web service endpoint for retrieving user permissions. Updated client lib

import it.inaf.ia2.gms.client.call.CreateGroupCall;

import it.inaf.ia2.gms.client.call.DeleteGroupCall;

import it.inaf.ia2.gms.client.call.GetUserGroupsCall;

import it.inaf.ia2.gms.client.call.GetUserPermissionsCall;

import it.inaf.ia2.gms.client.call.ListGroupsCall;

import it.inaf.ia2.gms.client.call.RemoveMemberCall;

import it.inaf.ia2.gms.client.call.RemovePermissionCall;

import it.inaf.ia2.gms.client.model.Permission;

import it.inaf.ia2.gms.client.model.UserPermission;

import java.util.List;

public class GmsClient {

        if (!baseUrl.endsWith("/")) {

            baseUrl += "/";

        }

        baseUrl += "ws/jwt";

        httpClientWrapper = new HttpClientWrapper(baseUrl);

    }

    public void removePermission(String completeGroupName, String userId) {

        new RemovePermissionCall(httpClientWrapper).removePermission(completeGroupName, userId);

    }

    public List<UserPermission> getUserPermissions(String userId) {

        return new GetUserPermissionsCall(httpClientWrapper).getUserPermissions(userId);

    }

}

package it.inaf.ia2.gms.client.call;

import it.inaf.ia2.gms.client.model.Permission;

import it.inaf.ia2.gms.client.model.UserPermission;

import java.net.http.HttpRequest;

import java.net.http.HttpResponse;

import java.util.ArrayList;

import java.util.List;

import java.util.Scanner;

public class GetUserPermissionsCall extends BaseGmsCall {

    public GetUserPermissionsCall(HttpClientWrapper clientWrapper) {

        super(clientWrapper);

    }

    public List<UserPermission> getUserPermissions(String userId) {

        List<UserPermission> userPermissions = new ArrayList<>();

        String endpoint = "permission";

        endpoint += "?user_id=" + userId;

        HttpRequest groupsRequest = newHttpRequest(endpoint)

                .header("Accept", "text/plain")

                .GET()

                .build();

        return getClient().sendAsync(groupsRequest, HttpResponse.BodyHandlers.ofInputStream())

                .thenApply(response -> {

                    if (response.statusCode() == 200) {

                        return response.body();

                    }

                    logServerErrorInputStream(groupsRequest, response);

                    throw new IllegalStateException("Unable to retrieve groups");

                })

                .thenApply(inputStream -> {

                    try (Scanner scan = new Scanner(inputStream)) {

                        while (scan.hasNextLine()) {

                            String line = scan.nextLine();

                            if (!line.isEmpty()) {

                                String[] split = line.split(" ");

                                UserPermission userPermission = new UserPermission();

                                userPermission.setGroup(split[0]);

                                userPermission.setPermission(Permission.valueOf(split[1]));

                                userPermissions.add(userPermission);

                            }

                        }

                    }

                    return userPermissions;

                }).join();

    }

}

package it.inaf.ia2.gms.client.model;

public class UserPermission {

    private String group;

    private Permission permission;

    public String getGroup() {

        return group;

    }

    public void setGroup(String group) {

        this.group = group;

    }

    public Permission getPermission() {

        return permission;

    }

    public void setPermission(Permission permission) {

        this.permission = permission;

    }

}

import it.inaf.ia2.gms.manager.MembershipManager;

import it.inaf.ia2.gms.manager.PermissionsManager;

import it.inaf.ia2.gms.model.Permission;

import it.inaf.ia2.gms.model.response.UserPermission;

import it.inaf.ia2.gms.persistence.GroupsDAO;

import it.inaf.ia2.gms.persistence.PermissionsDAO;

import it.inaf.ia2.gms.persistence.model.GroupEntity;

import it.inaf.ia2.gms.service.GroupsService;

import it.inaf.ia2.gms.service.JoinService;

import it.inaf.ia2.gms.service.PermissionUtils;

import it.inaf.ia2.gms.service.SearchService;

import java.io.IOException;

import java.io.PrintWriter;

import java.security.Principal;

    @Autowired

    private PermissionsDAO permissionsDAO;

    @Autowired

    private SearchService searchService;

    /**

     * This endpoint is compliant with the IVOA GMS standard.

     */

        response.setStatus(HttpServletResponse.SC_NO_CONTENT);

    }

    @GetMapping(value = "/permission", produces = MediaType.TEXT_PLAIN_VALUE)

    public void getUserPermission(@RequestParam("user_id") String userId, HttpServletRequest request, HttpServletResponse response) throws IOException {

        try (PrintWriter pw = new PrintWriter(response.getOutputStream())) {

            for (UserPermission userPermission : searchService.getUserPermission(userId, permissionsManager.getCurrentUserPermissions(getRoot()))) {

                String group = String.join(".", userPermission.getGroupCompleteName());

                pw.println(group + " " + userPermission.getPermission());

            }

        }

    }

    @PostMapping(value = {"/permission/{group:.+}", "/permission/"}, produces = MediaType.TEXT_PLAIN_VALUE)

    public void addPermission(@PathVariable("group") Optional<String> groupNames, HttpServletRequest request, HttpServletResponse response) throws IOException {

                .collect(Collectors.toList());

    }

    private List<UserPermission> getUserPermission(String targetUserId, List<PermissionEntity> actorPermissions) {

    public List<UserPermission> getUserPermission(String targetUserId, List<PermissionEntity> actorPermissions) {

        List<UserPermission> permissions = new ArrayList<>();