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diff --git a/OpenSim/Addons/Groups/Service/HGGroupsService.cs b/OpenSim/Addons/Groups/Service/HGGroupsService.cs
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+++ b/OpenSim/Addons/Groups/Service/HGGroupsService.cs
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+/*
+ * Copyright (c) Contributors, http://opensimulator.org/
+ * See CONTRIBUTORS.TXT for a full list of copyright holders.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of the OpenSimulator Project nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+using System;
+using System.Collections.Generic;
+using System.Reflection;
+using System.Timers;
+using log4net;
+using Nini.Config;
+
+using OpenMetaverse;
+using OpenSim.Data;
+using OpenSim.Framework;
+using OpenSim.Services.Interfaces;
+
+namespace OpenSim.Groups
+{
+    public class HGGroupsService : GroupsService
+    {
+        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
+
+        private IOfflineIMService m_OfflineIM;
+        private IUserAccountService m_UserAccounts;
+        private string m_HomeURI;
+
+        public HGGroupsService(IConfigSource config, IOfflineIMService im, IUserAccountService users, string homeURI)
+            : base(config, string.Empty)
+        {
+            m_OfflineIM = im;
+            m_UserAccounts = users;
+            m_HomeURI = homeURI;
+            if (!m_HomeURI.EndsWith("/"))
+                m_HomeURI += "/";
+        }
+
+
+        #region HG specific operations
+
+        public bool CreateGroupProxy(string RequestingAgentID, string agentID,  string accessToken, UUID groupID, string serviceLocation, string name, out string reason)
+        {
+            reason = string.Empty;
+            Uri uri = null;
+            try
+            {
+                uri = new Uri(serviceLocation);
+            }
+            catch (UriFormatException)
+            {
+                reason = "Bad location for group proxy";
+                return false;
+            }
+
+            // Check if it already exists
+            GroupData grec = m_Database.RetrieveGroup(groupID);
+            if (grec == null || 
+                (grec != null && grec.Data["Location"] != string.Empty && grec.Data["Location"].ToLower() != serviceLocation.ToLower()))
+            {
+                // Create the group
+                grec = new GroupData();
+                grec.GroupID = groupID;
+                grec.Data = new Dictionary<string, string>();
+                grec.Data["Name"] = name + " @ " + uri.Authority;
+                grec.Data["Location"] = serviceLocation;
+                grec.Data["Charter"] = string.Empty;
+                grec.Data["InsigniaID"] = UUID.Zero.ToString();
+                grec.Data["FounderID"] = UUID.Zero.ToString();
+                grec.Data["MembershipFee"] = "0";
+                grec.Data["OpenEnrollment"] = "0";
+                grec.Data["ShowInList"] = "0";
+                grec.Data["AllowPublish"] = "0";
+                grec.Data["MaturePublish"] = "0";
+                grec.Data["OwnerRoleID"] = UUID.Zero.ToString();
+
+
+                if (!m_Database.StoreGroup(grec))
+                    return false;
+            }
+
+            if (grec.Data["Location"] == string.Empty)
+            {
+                reason = "Cannot add proxy membership to non-proxy group";
+                return false;
+            }
+
+            UUID uid = UUID.Zero;
+            string url = string.Empty, first = string.Empty, last = string.Empty, tmp = string.Empty;
+            Util.ParseUniversalUserIdentifier(RequestingAgentID, out uid, out url, out first, out last, out tmp);
+            string fromName = first + "." + last + "@" + url;
+
+            // Invite to group again
+            InviteToGroup(fromName, groupID, new UUID(agentID), grec.Data["Name"]);
+
+            // Stick the proxy membership in the DB already
+            // we'll delete it if the agent declines the invitation
+            MembershipData membership = new MembershipData();
+            membership.PrincipalID = agentID;
+            membership.GroupID = groupID;
+            membership.Data = new Dictionary<string, string>();
+            membership.Data["SelectedRoleID"] = UUID.Zero.ToString();
+            membership.Data["Contribution"] = "0";
+            membership.Data["ListInProfile"] = "1";
+            membership.Data["AcceptNotices"] = "1";
+            membership.Data["AccessToken"] = accessToken;
+
+            m_Database.StoreMember(membership);
+
+            return true;
+        }
+
+        public void RemoveAgentFromGroup(string RequestingAgentID, string AgentID, UUID GroupID, string token)
+        {
+            // check the token
+            MembershipData membership = m_Database.RetrieveMember(GroupID, AgentID);
+            if (membership != null)
+            {
+                if (token != string.Empty && token.Equals(membership.Data["AccessToken"]))
+                    RemoveAgentFromGroup(RequestingAgentID, AgentID, GroupID);
+                else
+                    m_log.DebugFormat("[Groups.HGGroupsService]: access token {0} did not match stored one {1}", token, membership.Data["AccessToken"]);
+            }
+            else
+                m_log.DebugFormat("[Groups.HGGroupsService]: membership not found for {0}", AgentID);
+        }
+
+        public ExtendedGroupRecord GetGroupRecord(string RequestingAgentID, UUID GroupID, string groupName, string token)
+        {
+            // check the token
+            if (!VerifyToken(GroupID, RequestingAgentID, token))
+                return null;
+
+            ExtendedGroupRecord grec;
+            if (GroupID == UUID.Zero)
+                grec = GetGroupRecord(RequestingAgentID, groupName);
+            else
+                grec = GetGroupRecord(RequestingAgentID, GroupID);
+
+            if (grec != null)
+                FillFounderUUI(grec);
+
+            return grec;
+        }
+
+        public List<ExtendedGroupMembersData> GetGroupMembers(string RequestingAgentID, UUID GroupID, string token)
+        {
+            if (!VerifyToken(GroupID, RequestingAgentID, token))
+                return new List<ExtendedGroupMembersData>();
+
+            List<ExtendedGroupMembersData> members = GetGroupMembers(RequestingAgentID, GroupID);
+
+            // convert UUIDs to UUIs
+            members.ForEach(delegate (ExtendedGroupMembersData m)
+            {
+                if (m.AgentID.ToString().Length == 36) // UUID
+                {
+                    UserAccount account = m_UserAccounts.GetUserAccount(UUID.Zero, new UUID(m.AgentID));
+                    if (account != null)
+                        m.AgentID = Util.UniversalIdentifier(account.PrincipalID, account.FirstName, account.LastName, m_HomeURI);
+                }
+            });
+
+            return members;
+        }
+
+        public List<GroupRolesData> GetGroupRoles(string RequestingAgentID, UUID GroupID, string token)
+        {
+            if (!VerifyToken(GroupID, RequestingAgentID, token))
+                return new List<GroupRolesData>();
+
+            return GetGroupRoles(RequestingAgentID, GroupID);
+        }
+
+        public List<ExtendedGroupRoleMembersData> GetGroupRoleMembers(string RequestingAgentID, UUID GroupID, string token)
+        {
+            if (!VerifyToken(GroupID, RequestingAgentID, token))
+                return new List<ExtendedGroupRoleMembersData>();
+
+            List<ExtendedGroupRoleMembersData> rolemembers = GetGroupRoleMembers(RequestingAgentID, GroupID);
+
+            // convert UUIDs to UUIs
+            rolemembers.ForEach(delegate(ExtendedGroupRoleMembersData m)
+            {
+                if (m.MemberID.ToString().Length == 36) // UUID
+                {
+                    UserAccount account = m_UserAccounts.GetUserAccount(UUID.Zero, new UUID(m.MemberID));
+                    if (account != null)
+                        m.MemberID = Util.UniversalIdentifier(account.PrincipalID, account.FirstName, account.LastName, m_HomeURI);
+                }
+            });
+
+            return rolemembers;
+        }
+
+        public bool AddNotice(string RequestingAgentID, UUID groupID, UUID noticeID, string fromName, string subject, string message,
+            bool hasAttachment, byte attType, string attName, UUID attItemID, string attOwnerID)
+        {
+            // check that the group proxy exists
+            ExtendedGroupRecord grec = GetGroupRecord(RequestingAgentID, groupID);
+            if (grec == null)
+            {
+                m_log.DebugFormat("[Groups.HGGroupsService]: attempt at adding notice to non-existent group proxy");
+                return false;
+            }
+
+            // check that the group is remote
+            if (grec.ServiceLocation == string.Empty)
+            {
+                m_log.DebugFormat("[Groups.HGGroupsService]: attempt at adding notice to local (non-proxy) group");
+                return false;
+            }
+
+            // check that there isn't already a notice with the same ID
+            if (GetGroupNotice(RequestingAgentID, noticeID) != null)
+            {
+                m_log.DebugFormat("[Groups.HGGroupsService]: a notice with the same ID already exists", grec.ServiceLocation);
+                return false;
+            }
+
+            // This has good intentions (security) but it will potentially DDS the origin...
+            // We'll need to send a proof along with the message. Maybe encrypt the message
+            // using key pairs
+            //
+            //// check that the notice actually exists in the origin
+            //GroupsServiceHGConnector c = new GroupsServiceHGConnector(grec.ServiceLocation);
+            //if (!c.VerifyNotice(noticeID, groupID))
+            //{
+            //    m_log.DebugFormat("[Groups.HGGroupsService]: notice does not exist at origin {0}", grec.ServiceLocation);
+            //    return false;
+            //}
+
+            // ok, we're good!
+            return _AddNotice(groupID, noticeID, fromName, subject, message, hasAttachment, attType, attName, attItemID, attOwnerID);
+        }
+
+        public bool VerifyNotice(UUID noticeID, UUID groupID)
+        {
+            GroupNoticeInfo notice = GetGroupNotice(string.Empty, noticeID);
+
+            if (notice == null)
+                return false;
+
+            if (notice.GroupID != groupID)
+                return false;
+
+            return true;
+        }
+
+        #endregion
+
+        private void InviteToGroup(string fromName, UUID groupID, UUID invitedAgentID, string groupName)
+        {
+            // Todo: Security check, probably also want to send some kind of notification
+            UUID InviteID = UUID.Random();
+
+            if (AddAgentToGroupInvite(InviteID, groupID, invitedAgentID.ToString()))
+            {
+                Guid inviteUUID = InviteID.Guid;
+
+                GridInstantMessage msg = new GridInstantMessage();
+
+                msg.imSessionID = inviteUUID;
+
+                // msg.fromAgentID = agentID.Guid;
+                msg.fromAgentID = groupID.Guid;
+                msg.toAgentID = invitedAgentID.Guid;
+                //msg.timestamp = (uint)Util.UnixTimeSinceEpoch();
+                msg.timestamp = 0;
+                msg.fromAgentName = fromName;
+                msg.message = string.Format("Please confirm your acceptance to join group {0}.", groupName);
+                msg.dialog = (byte)OpenMetaverse.InstantMessageDialog.GroupInvitation;
+                msg.fromGroup = true;
+                msg.offline = (byte)0;
+                msg.ParentEstateID = 0;
+                msg.Position = Vector3.Zero;
+                msg.RegionID = UUID.Zero.Guid;
+                msg.binaryBucket = new byte[20];
+
+                string reason = string.Empty;
+                m_OfflineIM.StoreMessage(msg, out reason);
+
+            }
+        }
+
+        private bool AddAgentToGroupInvite(UUID inviteID, UUID groupID, string agentID)
+        {
+            // Check whether the invitee is already a member of the group
+            MembershipData m = m_Database.RetrieveMember(groupID, agentID);
+            if (m != null)
+                return false;
+
+            // Check whether there are pending invitations and delete them
+            InvitationData invite = m_Database.RetrieveInvitation(groupID, agentID);
+            if (invite != null)
+                m_Database.DeleteInvite(invite.InviteID);
+
+            invite = new InvitationData();
+            invite.InviteID = inviteID;
+            invite.PrincipalID = agentID;
+            invite.GroupID = groupID;
+            invite.RoleID = UUID.Zero;
+            invite.Data = new Dictionary<string, string>();
+
+            return m_Database.StoreInvitation(invite);
+        }
+
+        private void FillFounderUUI(ExtendedGroupRecord grec)
+        {
+            UserAccount account = m_UserAccounts.GetUserAccount(UUID.Zero, grec.FounderID);
+            if (account != null)
+                grec.FounderUUI = Util.UniversalIdentifier(account.PrincipalID, account.FirstName, account.LastName, m_HomeURI);
+        }
+
+        private bool VerifyToken(UUID groupID, string agentID, string token)
+        {
+            // check the token
+            MembershipData membership = m_Database.RetrieveMember(groupID, agentID);
+            if (membership != null)
+            {
+                if (token != string.Empty && token.Equals(membership.Data["AccessToken"]))
+                    return true;
+                else
+                    m_log.DebugFormat("[Groups.HGGroupsService]: access token {0} did not match stored one {1}", token, membership.Data["AccessToken"]);
+            }
+            else
+                m_log.DebugFormat("[Groups.HGGroupsService]: membership not found for {0}", agentID);
+
+            return false;
+        }
+    }
+}