/atlassian-kinect-wallboard-extensions/src/main/java/com/atlassian/jirawallboard/resttransitionproxy/GroupsResource.java

package com.atlassian.jirawallboard.resttransitionproxy;

import com.atlassian.core.user.GroupUtils;
import com.atlassian.core.user.UserUtils;
import com.atlassian.jira.security.JiraAuthenticationContext;
import com.atlassian.jira.user.util.UserUtil;
import com.opensymphony.user.Group;
import com.opensymphony.user.User;

import javax.ws.rs.Consumes;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
 * TODO: Document this class / interface here
 *
 * @since v4.4
 */

@Path ("groups")
@Consumes ( { MediaType.APPLICATION_JSON })
@Produces ( { MediaType.APPLICATION_JSON })
public class GroupsResource
{
    private final JiraAuthenticationContext authContext;

    public GroupsResource(UserUtil userUtil, JiraAuthenticationContext authContext)
    {
        this.authContext = authContext ;
    }

    @GET
    @Path ("/{groupName}")
    public Response getGroupMembers(@PathParam ("groupName") final String groupName)
    {
        if(authContext.getLoggedInUser() == null)
        {
            throw new RESTException(Response.Status.UNAUTHORIZED, ErrorCollection.of("Client must be authenticated to access this resource."));
        }
        Group group = GroupUtils.getGroup(groupName);
        if (group == null)
        {
            throw new RESTException(Response.Status.NOT_FOUND, ErrorCollection.of("No group named " + groupName + " exists"));
        }

        // TODO: we should not be making 1 + n REST calls to get the collection of users
        // we can collapse this into a single neat call giving us all the info we need

        List<String> usernames = new ArrayList<String>(group.getUsers());
        Collections.sort(usernames);

        GroupsBeanBuilder builder = new GroupsBeanBuilder().groupName(groupName).users(usernames);

        return Response.ok(builder.build()).cacheControl(TransitionAsUserResource.never()).build();

    }
}