Add /dumps/rankUsers?rank=<rank> to get all Users with a certain rank

src/main/java/net/frozenorb/apiv3/model/User.java

@@ -153,6 +153,23 @@ public final class User {
         usersCollection.find(new Document("lastUsernameLower", lastUsernameLower.toLowerCase())).first(SyncUtils.vertxWrap(callback));
     }
 
+    public static void findByIdGrouped(Set<UUID> search, SingleResultCallback<Map<UUID, User>> callback) {
+        usersCollection.find(new Document("_id", new Document("$in", search))).into(new LinkedList<>(), SyncUtils.vertxWrap((users, error) -> {
+            if (error != null) {
+                callback.onResult(null, error);
+                return;
+            }
+
+            Map<UUID, User> result = new HashMap<>();
+
+            for (User user : users) {
+                result.put(user.getId(), user);
+            }
+
+            callback.onResult(result, null);
+        }));
+    }
+
 	public static void findOrCreateByIdGrouped(Map<UUID, String> search, SingleResultCallback<Map<UUID, User>> callback) {
 		usersCollection.find(new Document("_id", new Document("$in", search.keySet()))).into(new LinkedList<>(), SyncUtils.vertxWrap((users, error) -> {
 			if (error != null) {

src/main/java/net/frozenorb/apiv3/route/GETDumpsType.java

@@ -179,6 +179,37 @@ public final class GETDumpsType implements Handler<RoutingContext> {
 
 				APIv3.respondJson(ctx, 200, grantCache.get(serverGroup.toLowerCase()));
 				return;
+			case "rankusers":
+				Rank rank = Rank.findById(ctx.request().getParam("rank"));
+
+				if (rank == null) {
+					ErrorUtils.respondNotFound(ctx, "Rank", ctx.request().getParam("rank"));
+					return;
+				}
+
+				Grant.findByRank(ImmutableSet.of(rank), (grants, grantError) -> {
+                    if (grantError != null) {
+                        ErrorUtils.respondInternalError(ctx, grantError);
+                        return;
+                    }
+
+                    Set<UUID> uuids = new HashSet<>();
+
+                    for (Grant grant : grants) {
+                        if (grant.isActive()) {
+                            uuids.add(grant.getUser());
+                        }
+                    }
+
+                    User.findByIdGrouped(uuids, (users, userError) -> {
+						if (userError != null) {
+							ErrorUtils.respondInternalError(ctx, userError);
+						} else {
+							APIv3.respondJson(ctx, 200, users.values());
+						}
+					});
+                });
+				return;
 			case "ipintel":
 				APIv3.respondJson(ctx, 200, ipIntelCache.values());
 				return;