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diff --git a/OpenSim/Data/IUserData.cs b/OpenSim/Data/IUserData.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 OpenSim 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.Collections.Generic;
+using OpenMetaverse;
+using OpenSim.Framework;
+
+namespace OpenSim.Data
+{
+    /// <summary>
+    /// An interface for connecting to user storage servers.
+    /// </summary>
+    public interface IUserDataPlugin : IPlugin
+    {
+        /// <summary>
+        /// Returns a user profile from a database via their UUID
+        /// </summary>
+        /// <param name="user">The user's UUID</param>
+        /// <returns>The user data profile.  Returns null if no user is found</returns>
+        UserProfileData GetUserByUUID(UUID user);
+
+        /// <summary>
+        /// Returns a users profile by searching their username parts
+        /// </summary>
+        /// <param name="fname">Account firstname</param>
+        /// <param name="lname">Account lastname</param>
+        /// <returns>The user data profile</returns>
+        UserProfileData GetUserByName(string fname, string lname);
+
+        /// <summary>
+        /// Returns a list of UUIDs firstnames and lastnames that match string query entered into the avatar picker.
+        /// </summary>
+        /// <param name="queryID">ID associated with the user's query. This must match what the client sent</param>
+        /// <param name="query">The filtered contents of the search box when the user hit search.</param>
+        /// <returns>The user data profile</returns>
+        List<AvatarPickerAvatar> GeneratePickerResults(UUID queryID, string query);
+
+        /// <summary>
+        /// Returns the current agent for a user searching by it's UUID
+        /// </summary>
+        /// <param name="user">The users UUID</param>
+        /// <returns>The current agent session</returns>
+        UserAgentData GetAgentByUUID(UUID user);
+
+        /// <summary>
+        /// Returns the current session agent for a user searching by username
+        /// </summary>
+        /// <param name="name">The users account name</param>
+        /// <returns>The current agent session</returns>
+        UserAgentData GetAgentByName(string name);
+
+        /// <summary>
+        /// Returns the current session agent for a user searching by username parts
+        /// </summary>
+        /// <param name="fname">The users first account name</param>
+        /// <param name="lname">The users account surname</param>
+        /// <returns>The current agent session</returns>
+        UserAgentData GetAgentByName(string fname, string lname);
+
+        /// <summary>
+        /// Stores new web-login key for user during web page login
+        /// </summary>
+        /// <param name="webLoginKey"></param>
+        void StoreWebLoginKey(UUID agentID, UUID webLoginKey);
+
+        /// <summary>
+        /// Adds a new User profile to the database
+        /// </summary>
+        /// <param name="user">UserProfile to add</param>
+        void AddNewUserProfile(UserProfileData user);
+
+        /// <summary></summary>
+        ///  Updates an existing user profile
+        /// </summary>
+        /// <param name="user">UserProfile to update</param>
+        bool UpdateUserProfile(UserProfileData user);
+
+        /// <summary>
+        /// Adds a new agent to the database
+        /// </summary>
+        /// <param name="agent">The agent to add</param>
+        void AddNewUserAgent(UserAgentData agent);
+
+        /// <summary>
+        /// Adds a new friend to the database for XUser
+        /// </summary>
+        /// <param name="friendlistowner">The agent that who's friends list is being added to</param>
+        /// <param name="friend">The agent that being added to the friends list of the friends list owner</param>
+        /// <param name="perms">A uint bit vector for set perms that the friend being added has; 0 = none, 1=This friend can see when they sign on, 2 = map, 4 edit objects </param>
+        void AddNewUserFriend(UUID friendlistowner, UUID friend, uint perms);
+
+        /// <summary>
+        /// Delete friend on friendlistowner's friendlist.
+        /// </summary>
+        /// <param name="friendlistowner">The agent that who's friends list is being updated</param>
+        /// <param name="friend">The Ex-friend agent</param>
+        void RemoveUserFriend(UUID friendlistowner, UUID friend);
+
+        /// <summary>
+        /// Update permissions for friend on friendlistowner's friendlist.
+        /// </summary>
+        /// <param name="friendlistowner">The agent that who's friends list is being updated</param>
+        /// <param name="friend">The agent that is getting or loosing permissions</param>
+        /// <param name="perms">A uint bit vector for set perms that the friend being added has; 0 = none, 1=This friend can see when they sign on, 2 = map, 4 edit objects </param>
+        void UpdateUserFriendPerms(UUID friendlistowner, UUID friend, uint perms);
+
+        /// <summary>
+        /// Returns a list of FriendsListItems that describe the friends and permissions in the friend relationship for UUID friendslistowner
+        /// </summary>
+        /// <param name="friendlistowner">The agent that we're retreiving the friends Data.</param>
+        List<FriendListItem> GetUserFriendList(UUID friendlistowner);
+
+        /// <summary>
+        /// Returns a list of <see cref="FriendRegionInfo/>s for the specified UUIDs.
+        /// </summary>
+        /// <param name="uuids">
+        /// A <see cref="List"/> of <see cref="UUID/>s to fetch info for
+        /// </param>
+        /// <returns>
+        /// A <see cref="Dictionary"/>, mapping the <see cref="UUID"/>s to <see cref="FriendRegionInfo"/>s.
+        /// </returns>
+        Dictionary<UUID, FriendRegionInfo> GetFriendRegionInfos(List<UUID> uuids);
+
+        /// <summary>
+        /// Attempts to move currency units between accounts (NOT RELIABLE / TRUSTWORTHY. DONT TRY RUN YOUR OWN CURRENCY EXCHANGE WITH REAL VALUES)
+        /// </summary>
+        /// <param name="from">The account to transfer from</param>
+        /// <param name="to">The account to transfer to</param>
+        /// <param name="amount">The amount to transfer</param>
+        /// <returns>Successful?</returns>
+        bool MoneyTransferRequest(UUID from, UUID to, uint amount);
+
+        /// <summary>
+        /// Attempts to move inventory between accounts, if inventory is copyable it will be copied into the target account.
+        /// </summary>
+        /// <param name="from">User to transfer from</param>
+        /// <param name="to">User to transfer to</param>
+        /// <param name="inventory">Specified inventory item</param>
+        /// <returns>Successful?</returns>
+        bool InventoryTransferRequest(UUID from, UUID to, UUID inventory);
+
+        /// <summary>
+        /// Initialises the plugin (artificial constructor)
+        /// </summary>
+        void Initialise(string connect);
+
+        /// <summary>
+        /// Gets the user appearance
+        /// </summer>
+        AvatarAppearance GetUserAppearance(UUID user);
+
+        void UpdateUserAppearance(UUID user, AvatarAppearance appearance);
+
+        void ResetAttachments(UUID userID);
+
+        void LogoutUsers(UUID regionID);
+    }
+
+    public class UserDataInitialiser : PluginInitialiserBase
+    {
+        private string connect;
+        public UserDataInitialiser (string s) { connect = s; }
+        public override void Initialise (IPlugin plugin)
+        {
+            IUserDataPlugin p = plugin as IUserDataPlugin;
+            p.Initialise (connect);
+        }
+    }
+}