diff --git a/init.lua b/init.lua
index 73f4585..64a7cfc 100644
--- a/init.lua
+++ b/init.lua
@@ -1,614 +1,614 @@
-
-
-          
---[[
-    Shared locked objects (Mod for MineTest)
-    Allows to restrict usage of blocks to a certain player or a group of
-    players.
-    Copyright (C) 2013 Sokomine
-
-    This program is free software: you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation, either version 3 of the License, or
-    (at your option) any later version.
-
-    This program is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
-
-    You should have received a copy of the GNU General Public License
-    along with this program.  If not, see <http://www.gnu.org/licenses/>.
---]]
-
--- Version 1.20
-
--- Changelog: 
--- 08.05.2014 * Changed animation of shared locked furnace (removed pipeworks overlay on front, changed to new animation type)
--- 10.01.2013 * Added command to toggle for pipeworks output
---            * Added pipeworks support for chests and furnace.
--- 17.12.2013 * aborting input with ESC is possible again
--- 01.09.2013 * fixed bug in input sanitization
--- 31.08.2013 * changed receipe for key to avoid crafting conflickt with screwdriver
--- 10.07.2013 * removed a potential bug (now uses string:gmatch)
---            * added shared locked furnaces
-
-
-
-locks = {};
-
-minetest.register_privilege("openlocks", { description = "allows to open/use all locked objects", give_to_singleplayer = false});
-minetest.register_privilege("diglocks",  { description = "allows to open/use and dig up all locked objects", give_to_singleplayer = false});
-
-
-locks.pipeworks_enabled = false;
-
-if( minetest.get_modpath("pipeworks") ~= nil ) then
-   locks.pipeworks_enabled = true;
-end
-
--- initializes a lock (that is: prepare the metadata so that it can store data)
---  default_formspec is the formspec that will be used on right click; the input field for the commands has to exist 
--- Call this in on_construct in register_node. Excample:
---        on_construct = function(pos)
---              locks:lock_init( pos, "" );
---        end;
-
-function locks:lock_init( pos, default_formspec )
-
-   if( pos == nil ) then
-      print( "Error: [locks] lock_init: pos is nil");
-      return;
-   end
-
-   local meta = minetest.env:get_meta(pos);
-   if( meta == nil ) then
-      print( "Error: [locks] lock_init: unable to get meta data");
-      return;
-   end
-
-   -- this will be changed after the node is placed
-   meta:set_string("infotext", "Locked object");
-   -- prepare the field for the owner
-   meta:set_string("owner", "");
-   -- this is the list of players/groups that may unlock the lock even if they are not the owner
-   meta:set_string("allowed_users","");
-   -- objects can be unlocked by passwords as well (if it is set)
-   meta:set_string("password","");
-   -- the last player who entered the right password (to save space this is not a list)
-   meta:set_string("pw_user","");
-   -- this formspec is presented on right-click for every user
-   meta:set_string("formspec",        default_formspec);
-   -- by default, do not send output to pipework tubes
-   meta:set_int(   "allow_pipeworks", 0 );
-end
-
-
--- returns the information stored in the metadata strings (like owner etc.)
-function locks:get_lockdata( pos )
-   if( pos == nil ) then
-      return;
-   end
- 
-   local meta = minetest.env:get_meta(pos);
-   if( meta == nil) then
-      return;
-   end
-
-   return{ infotext      = (meta:get_string( "infotext" ) or ""),
-           owner         = (meta:get_string( "owner"    ) or ""),
-           allowed_users = (meta:get_string( "allowed_users" ) or ""),
-           password      = (meta:get_string( "password"      ) or ""),
-           pw_user       = (meta:get_string( "w_user"        ) or ""),
-           formspec      = (meta:get_string( "formspec"      ) or "")
-   };
-end
-
-
--- sets all the metadata the look needs (used e.g. in doors)
-function locks:set_lockdata( pos, data )
-   if( pos == nil ) then
-      return;
-   end
- 
-   local meta = minetest.env:get_meta(pos);
-   if( meta == nil) then
-      return;
-   end
-   
-   meta:set_string("infotext",     (data.infotext      or ""));
-   meta:set_string("owner",        (data.owner         or ""));
-   meta:set_string("allowed_users",(data.allowed_users or ""));
-   meta:set_string("password",     (data.password      or ""));
-   meta:set_string("pw_user",      (data.pw_user       or ""));
-   meta:set_string("formspec",     (data.formspec      or ""));
-end
-
-
-
-
--- Set the owner of the locked object.
--- Call this in after_place_node in register_node. Example:
---        after_place_node = function(pos, placer)
---                locks:lock_set_owner( pos, placer, "Shared locked object" );
---        end,
-function locks:lock_set_owner( pos, player_or_name, description )
-
-   if( pos == nil or player_or_name == nil ) then
-      print( "Error: [locks] Missing/wrong parameters to lock_set_owner");
-      return false;
-   end
-   
-   local meta = minetest.env:get_meta(pos);
-   if( meta == nil ) then
-      print( "Error: [locks] lock_set_owner: unable to get meta data");
-      return;
-   end
-
-   -- accepts a name or a player object
-   if( type( player_or_name )~="string") then
-      player_or_name = player_or_name:get_player_name();
-   end
-
-   meta:set_string("owner", player_or_name or "");
-   -- add the name of the owner to the description
-   meta:set_string("infotext", ( description or "Shared lockecd object" ).." (owned by "..meta:get_string("owner")..")");
-end
-
-
-  
--- The locked object can only be digged by the owner OR by people with the diglocks priv
--- Call this in can_dig in register_node. Example:
---        can_dig = function(pos,player)
---                return locks:lock_allow_dig( pos, player );
---        end
-function locks:lock_allow_dig( pos, player )
-
-   if( pos == nil or player == nil ) then
-      print( "Error: [locks] Missing/wrong parameters to lock_allow_dig");
-      return false;
-   end
-
-   local meta = minetest.env:get_meta(pos);
-   local lock_owner = meta:get_string("owner");
-
-   -- locks who lost their owner can be opened/digged by anyone
-   if( meta == nil or lock_owner == nil or lock_owner == "") then
-      return true;
-   end
-
-   -- the owner can dig up his own locked objects
-   if( player:get_player_name() == meta:get_string("owner")) then
-      return true;
-   end
-   
-   -- players with diglocks priv can dig up locked objects as well
-   if( minetest.check_player_privs(player:get_player_name(), {diglocks=true})) then
-     return true;
-   end
-
-   return false; -- fallback
-end
-    
-
--- The locked object can only be used (i.e. opened, stuff taken out, changed, ... - depends on object) if this
--- function returns true. Call it wherever appropriate (usually in on_punch in register_node). Example:
---        on_punch = function(pos,player)
---               if( !locks:lock_allow_use( pos, player ) then
---                  print( "Sorry, you have no access here.");
---               else
---                  do_what_this_object_is_good_for( pos, puncher );
---               end
---        end
-
-function locks:lock_allow_use( pos, player )
-
-   if( pos == nil or player == nil ) then
-      print( "Error: [locks] Missing/wrong parameters to lock_allow_use");
-      return false;
-   end
-
-   local name = player:get_player_name();
-   local meta = minetest.env:get_meta(pos);
-
-   -- pipeworks sends a special username
-   if( player.is_fake_player) then
-      if( locks:lock_allow_dig( pos, player ) and meta:get_int( 'allow_pipeworks' ) == 1 ) then
-         return true;
-      else
-         return false;
-      end
-   end
-
-   -- the player has to have a key or a keychain to open his own shared locked objects
-   if( name == meta:get_string("owner")) then      
-
-      if(     not( player:get_inventory():contains_item("main","locks:keychain 1"))
-          and not( player:get_inventory():contains_item("main","locks:key 1"))) then
-          minetest.chat_send_player( name, "You do not have a key or a keychain. Without that you can't use your shared locked objects!");
-          return false;
-      end
-
-   -- the player has to have a keychain to open shared locked objects of other players
-   else 
-
-      if( not( player:get_inventory():contains_item("main","locks:keychain 1"))) then
-         minetest.chat_send_player(name, "You do not have a keychain. Without that you can't open shared locked objects of other players!");
-         return false;
-      end
-   end
-      
-   -- if the user would even be allowed to dig this node up, using the node is allowed as well 
-   if( locks:lock_allow_dig( pos, player )) then
-      return true;
-   end
-
-
-   if( meta == nil ) then
-      minetest.chat_send_player( name, "Error: Could not access metadata of this shared locked object.");
-      return false;
-   end
-
-   -- players with openlocks priv can open locked objects 
-   if( minetest.check_player_privs(name, {openlocks=true})) then
-      return true;
-   end
-
-   -- the player might be specificly allowed to use this object through allowed_users
-   local liste = meta:get_string("allowed_users"):split( "," );
-   for i in ipairs( liste ) do
- 
-      if( liste[i] == name ) then
-         return true;
-      end
-
-      -- the player might member of a playergroup that is allowed to use this object
-      if( liste[i]:sub(1,1) == ":"
-        and playergroups ~= nil
-        and playergroups:is_group_member( meta:get_string("owner"), liste[i]:sub(2), name )) then
-         return true;
-      end
-
-   end
-
-
-   -- the player may have entered the right password
-   if( name == meta:get_string("pw_user")) then
-      return true;
-   end
-
-   -- the lock may have a password set. If this is the case then ask the user for it
-   if( meta:get_string( "password" ) and meta:get_string( "password" ) ~= "" ) then
-      minetest.chat_send_player(name, "Access denied. Right-click and enter password first!");
-      return false;
-   end
-
-   return false; -- fallback
-
-end
-
-
-
--- Method for the lock to get password and configuration data
--- Call in on_receive_fields in register_node. Example:
---        on_receive_fields = function(pos, formname, fields, sender)
---                locks:lock_handle_input( pos, formname, fields, sender );
---        end,
-function locks:lock_handle_input( pos, formname, fields, player )
-
-   if( pos == nil or player == nil ) then
-      print( "Error: [locks] Missing/wrong parameters to lock_handle_input");
-      return false;
-   end
-
-   local meta = minetest.env:get_meta(pos);
-   if( meta == nil ) then
-      print( "Error: [locks] lock_handle_input: unable to get meta data");
-      return;
-   end
-
-   -- is this input the lock is supposed to handle?
-   if(  ( not( fields.locks_sent_lock_command )
-       or fields.locks_sent_lock_command == "" )
-      and (fields.quit and (fields.quit==true or fields.quit=='true'))) then
---    or not( fields.locks_sent_input )
-     return;
-   end
-
-   name = player:get_player_name();
-
-   if( fields.locks_sent_lock_command == "/help" ) then
-
-      if( name == meta:get_string( "owner" )) then
-         minetest.chat_send_player(name, "The following commands are available to you, the owner of this object, only:\n"..
-            "  /help           Shows this help text.\n"..
-            "  /add <name>     Player <name> can now unlock this object with any key.\n"..
-            "  /del <name>     Player <name> can no longer use this object.\n"..
-            "  /list           Shows a list of players who can use this object.\n"..
-            "  /set <password> Sets a password. Everyone who types that in can use the object.\n"..
-            "  /pipeworks      Toggles permission for pipeworks to take inventory out of the shared locked object.\n");
-
-      else if( locks:lock_allow_use( pos, player )) then
-         minetest.chat_send_player(name, "This locked object is owned by "..tostring( meta:get_string( "owner" ))..".\n"..
-            "You do have access to it.\n");
-
-      else if( meta:get_string( "password" ) ~= "" ) then
-         minetest.chat_send_player(name, "This locked object is owned by "..tostring( meta:get_string( "owner" ))..".\n"..
-            "Enter the correct password to gain access.\n");
-
-      else
-         minetest.chat_send_player(name, "This locked object is owned by "..tostring( meta:get_string( "owner" ))..".\n"..
-            "There is no password set. You can only gain access if the owner grants it to you.");
-
-      end end end -- lua is not the most intuitive language here....
-      return;
-   end -- of /help
-
-   -- sanitize player input
-   if( fields.locks_sent_lock_command:match("[^%a%d%s_%- /%:]")) then
-      minetest.chat_send_player(name, "Input contains unsupported characters. Allowed: a-z, A-Z, 0-9, _, -, :.");
-      return;
-   end
-    
-   if( #fields.locks_sent_lock_command > 60) then
-      minetest.chat_send_player(name, "Input too long. Only up to 80 characters supported.");
-      return;
-   end
-   
-
-   local password = meta:get_string("password");
-   -- other players can only try to input the correct password
-   if( name ~= meta:get_string( "owner" )
-       or (password and password ~= "" and password==fields.locks_sent_lock_command)
-       or (name==meta:get_string("pw_user"))) then 
-
-      -- no need to bother with trying other PWs if none is set...
-      if( meta:get_string("password")=="" ) then
-          minetest.chat_send_player(name, "There is no password set. Access denied.");
-          return;
-      end
-
-      -- the player may have entered the right password already
-      if( name == meta:get_string("pw_user")) then
-         -- nothing to do - the player entered the right pw alredy
-          minetest.chat_send_player(name, "You have entered the right password already. Access granted.");
-         return;
-      end
-
-      if( fields.locks_sent_lock_command ~= meta:get_string("password")) then
-          minetest.chat_send_player(name, "Wrong password. Access denied.");
-         return;
-      end
-
-      -- store the last user (this one) who entered the right pw
-      meta:set_string( "pw_user", name );
-
-      minetest.chat_send_player(name, "Password confirmed. Access granted.");
-      return;
-   end
- 
-   local txt = "";
-
-
-   if( fields.locks_sent_lock_command == "/list" ) then
-
-      if( meta:get_string("allowed_users")=="" ) then
-         txt = "No other users are allowed to use this object (except those with global privs like moderators/admins).";
-      else
-         txt = "You granted the following users/groups of users access to this object:\n";
-         local liste = meta:get_string("allowed_users"):split( "," );
-         for i in ipairs( liste ) do
-            txt = txt.."   "..tostring(liste[i]);
-         end
-      end
-
-      if( meta:get_string( "password" ) == "" ) then
-         txt = txt.."\nThere is no password set. That means no one can get access through a password.";  
-      else
-         txt = txt.."\nThe password for this lock is: \""..tostring( meta:get_string( "password" ).."\"");
-      end
-
-      if( not( minetest.get_modpath("pipeworks") )) then
-         txt = txt.."\nThe pipeworks mod is not installed. Install it if you wish support for tubes.";
-      elseif( meta:get_int( "allow_pipeworks" ) == 1 ) then
-         txt = txt.."\nTubes from pipeworks may be used to extract items out of/add items to this shared locked object.";
-      else
-         txt = txt.."\nInput from tubes is accepted, but output to them is denied (default).";
-      end
-
-      minetest.chat_send_player(name, txt );
-      return;
-   end -- of /list
-
-
-   -- toggle tube output on/off
-   if( fields.locks_sent_lock_command == "/pipeworks" ) then
-
-      if( meta:get_int('allow_pipeworks') == 1 ) then
-         meta:set_int('allow_pipeworks', 0 );
-         minetest.chat_send_player( name, 'Output to pipework tubes is now DISABLED (input is still acceped).');
-         return;
-      else
-         meta:set_int('allow_pipeworks', 1 );
-         minetest.chat_send_player( name, 'Output to pipework tubes is now ENABLED. Connected tubes may insert and remove items.');
-         return;
-      end
-   end
-
---   -- all other commands take exactly one parameter
-   local help = fields.locks_sent_lock_command:split( " " );
-   
-   print( tostring( help[1] ));
-   print( tostring( help[2] ));
-
-     
-   -- set/change a password
-   if( help[1]=="/set" ) then
-
-      -- if empty password then delete it
-      if( help[2]==nil ) then
-         help[2] = "";
-      end
-
-      minetest.chat_send_player(name, "Old password: \""..tostring( meta:get_string( "password" ))..
-                      "\"\n Changed to new password: \""..tostring( help[2]).."\".");
-
-
-      meta:set_string( "password", help[2]); 
-      -- reset the list of users who typed the right password
-      meta:set_string("pw_users","");
-
-      if( help[2]=="") then
-         minetest.chat_send_player(name, "The password is empty and thus will be disabled.");
-      end
-      return;
-   end
-
-   if( help[2]==nil or help[2]=="") then
-      minetest.chat_send_player(name, "Error: Missing parameter (player name) for command \""..tostring( help[1] ).."\"." );
-      return;
-   end
-
-   -- for add and del: check if the player is already in the list
-
-   local found = false;
-   local anz   = 0;
-   local liste = meta:get_string("allowed_users"):split( "," );
-   for i in ipairs( liste ) do
-
-      anz = anz + 1; -- count players 
-      if( tostring( liste[i] ) == help[2] ) then
-          found = true;
-      end
-
-   end
-
-   if( help[1]=="/add" and found==true ) then
-      minetest.chat_send_player(name, "Player \""..tostring( help[2] ).."\" is already allowed to use this locked object. Nothing to do.");
-      return;
-   end
-      
-   if( help[1]=="/del" and found==false) then
-      minetest.chat_send_player(name, "Player \""..tostring( help[2] ).."\" is not amongst the players allowed to use this locked object. Nothing to do.");
-      return;
-   end
-
-
-   if( help[1]=="/add" ) then
-
-      if( anz >= 6 ) then
-         minetest.chat_send_player(name, "Sorry, no more players can be added. To save space, only up to 6 players can be added. For more players please use groups!");
-         return;
-      end
-
-      if( name == help[2] ) then
-         minetest.chat_send_player(name, "You are already owner of this object.");
-         return;
-      end
-        
-      -- the player might try to add a playergroup
-      if( help[2]:sub(1,1) == ":" ) then
-          
-         if( not( playergroups )) then
-            minetest.chat_send_player(name, "Sorry, this server does not support playergroups.");
-            return;
-         end
-
-         if( #help[2]<2 ) then
-            minetest.chat_send_player(name, "Please specify the name of the playergroup you want to add!");
-            return;
-         end
-
-         if( not( playergroups:is_playergroup(meta:get_string("owner"), help[2]:sub(2) ))) then
-            minetest.chat_send_player(name, "You do not have a playergroup named \""..tostring( help[2]:sub(2)).."\".");
-            return;
-         end
- 
-      else
-            
-         -- check if the player exists
-         local privs = minetest.get_player_privs( help[2] );
-         if( not( privs ) or not( privs.interact )) then
-            minetest.chat_send_player(name, "Player \""..help[2].."\" not found or has no interact privs.");
-            return;
-         end
-      end
-        
-      meta:set_string( "allowed_users", meta:get_string("allowed_users")..","..help[2] );
-
-      if( help[2]:sub(1,1) == ":" ) then
-         minetest.chat_send_player(name, "All members of your playergroup "..tostring(help[2]:sub(2)).." may now use/access this locked object.");
-      else
-         minetest.chat_send_player(name, help[2].." may now use/access this locked object.");
-      end
-      return;
-   end
-
-
-   if( help[1]=="/del" ) then
-
-      userlist  = meta:get_string("allowed_users"):split( ","..help[2] );
-      meta:set_string( "allowed_users", ( userlist[1] or "" )..(userlist[2] or "" ));
-      
-      minetest.chat_send_player(name, "Access for player \""..tostring(help[2]).."\" has been revoked.");
-      return;
-   end
-
-   minetest.chat_send_player(name, "Error: Command \""..tostring(help[1]).."\" not understood.");
-end
-
-
-
--- craftitem; that can be used to craft shared locked objects
-minetest.register_craftitem("locks:lock", {
-        description = "Lock to lock and share objects",
-        image = "locks_lock16.png",
-});
-
-
-minetest.register_craft({
-        output = "locks:lock 2",
-        recipe = {
-                 {'default:steel_ingot', 'default:steel_ingot','default:steel_ingot'},
-                 {'default:steel_ingot', '',                   'default:steel_ingot'},
-                 {'',                    'default:steel_ingot',''},
-                }
-        });
-
-
--- a key allowes to open your own shared locked objects
-minetest.register_craftitem("locks:key", {
-        description = "Key to open your own shared locked objects",
-        image = "locks_key32.png",
-});
-
-minetest.register_craft({
-        output = "locks:key",
-        recipe = {
-                 {'',                    'default:stick',      ''},
-                 {'',                    'default:steel_ingot',''},
-                }
-        });
-
-
-
--- in order to open shared locked objects of other players, a keychain is needed (plus the owner has to admit it via /add playername or through /set password)
-minetest.register_craftitem("locks:keychain", {
-        description = "Keychain to open shared locked objects of others",
-        image = "locks_keychain32.png",
-});
-
-minetest.register_craft({
-        output = "locks:keychain",
-        recipe = {
-                 {'',                    'default:steel_ingot', '' },
-                 {'locks:key',           'locks:key',           'locks:key'},
-                }
-        });
-
-dofile(minetest.get_modpath("locks").."/shared_locked_chest.lua");
-dofile(minetest.get_modpath("locks").."/shared_locked_sign_wall.lua");
-dofile(minetest.get_modpath("locks").."/shared_locked_xdoors2.lua");
-dofile(minetest.get_modpath("locks").."/shared_locked_furnace.lua");
-
-
+
+
+          
+--[[
+    Shared locked objects (Mod for MineTest)
+    Allows to restrict usage of blocks to a certain player or a group of
+    players.
+    Copyright (C) 2013 Sokomine
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+--]]
+
+-- Version 1.20
+
+-- Changelog: 
+-- 08.05.2014 * Changed animation of shared locked furnace (removed pipeworks overlay on front, changed to new animation type)
+-- 10.01.2013 * Added command to toggle for pipeworks output
+--            * Added pipeworks support for chests and furnace.
+-- 17.12.2013 * aborting input with ESC is possible again
+-- 01.09.2013 * fixed bug in input sanitization
+-- 31.08.2013 * changed receipe for key to avoid crafting conflickt with screwdriver
+-- 10.07.2013 * removed a potential bug (now uses string:gmatch)
+--            * added shared locked furnaces
+
+
+
+locks = {};
+
+minetest.register_privilege("openlocks", { description = "allows to open/use all locked objects", give_to_singleplayer = false});
+minetest.register_privilege("diglocks",  { description = "allows to open/use and dig up all locked objects", give_to_singleplayer = false});
+
+
+locks.pipeworks_enabled = false;
+
+if( minetest.get_modpath("pipeworks") ~= nil ) then
+   locks.pipeworks_enabled = true;
+end
+
+-- initializes a lock (that is: prepare the metadata so that it can store data)
+--  default_formspec is the formspec that will be used on right click; the input field for the commands has to exist 
+-- Call this in on_construct in register_node. Excample:
+--        on_construct = function(pos)
+--              locks:lock_init( pos, "" );
+--        end;
+
+function locks:lock_init( pos, default_formspec )
+
+   if( pos == nil ) then
+      print( "Error: [locks] lock_init: pos is nil");
+      return;
+   end
+
+   local meta = minetest.env:get_meta(pos);
+   if( meta == nil ) then
+      print( "Error: [locks] lock_init: unable to get meta data");
+      return;
+   end
+
+   -- this will be changed after the node is placed
+   meta:set_string("infotext", "Locked object");
+   -- prepare the field for the owner
+   meta:set_string("owner", "");
+   -- this is the list of players/groups that may unlock the lock even if they are not the owner
+   meta:set_string("allowed_users","");
+   -- objects can be unlocked by passwords as well (if it is set)
+   meta:set_string("password","");
+   -- the last player who entered the right password (to save space this is not a list)
+   meta:set_string("pw_user","");
+   -- this formspec is presented on right-click for every user
+   meta:set_string("formspec",        default_formspec);
+   -- by default, do not send output to pipework tubes
+   meta:set_int(   "allow_pipeworks", 0 );
+end
+
+
+-- returns the information stored in the metadata strings (like owner etc.)
+function locks:get_lockdata( pos )
+   if( pos == nil ) then
+      return;
+   end
+ 
+   local meta = minetest.env:get_meta(pos);
+   if( meta == nil) then
+      return;
+   end
+
+   return{ infotext      = (meta:get_string( "infotext" ) or ""),
+           owner         = (meta:get_string( "owner"    ) or ""),
+           allowed_users = (meta:get_string( "allowed_users" ) or ""),
+           password      = (meta:get_string( "password"      ) or ""),
+           pw_user       = (meta:get_string( "w_user"        ) or ""),
+           formspec      = (meta:get_string( "formspec"      ) or "")
+   };
+end
+
+
+-- sets all the metadata the look needs (used e.g. in doors)
+function locks:set_lockdata( pos, data )
+   if( pos == nil ) then
+      return;
+   end
+ 
+   local meta = minetest.env:get_meta(pos);
+   if( meta == nil) then
+      return;
+   end
+   
+   meta:set_string("infotext",     (data.infotext      or ""));
+   meta:set_string("owner",        (data.owner         or ""));
+   meta:set_string("allowed_users",(data.allowed_users or ""));
+   meta:set_string("password",     (data.password      or ""));
+   meta:set_string("pw_user",      (data.pw_user       or ""));
+   meta:set_string("formspec",     (data.formspec      or ""));
+end
+
+
+
+
+-- Set the owner of the locked object.
+-- Call this in after_place_node in register_node. Example:
+--        after_place_node = function(pos, placer)
+--                locks:lock_set_owner( pos, placer, "Shared locked object" );
+--        end,
+function locks:lock_set_owner( pos, player_or_name, description )
+
+   if( pos == nil or player_or_name == nil ) then
+      print( "Error: [locks] Missing/wrong parameters to lock_set_owner");
+      return false;
+   end
+   
+   local meta = minetest.env:get_meta(pos);
+   if( meta == nil ) then
+      print( "Error: [locks] lock_set_owner: unable to get meta data");
+      return;
+   end
+
+   -- accepts a name or a player object
+   if( type( player_or_name )~="string") then
+      player_or_name = player_or_name:get_player_name();
+   end
+
+   meta:set_string("owner", player_or_name or "");
+   -- add the name of the owner to the description
+   meta:set_string("infotext", ( description or "Shared lockecd object" ).." (owned by "..meta:get_string("owner")..")");
+end
+
+
+  
+-- The locked object can only be digged by the owner OR by people with the diglocks priv
+-- Call this in can_dig in register_node. Example:
+--        can_dig = function(pos,player)
+--                return locks:lock_allow_dig( pos, player );
+--        end
+function locks:lock_allow_dig( pos, player )
+
+   if( pos == nil or player == nil ) then
+      print( "Error: [locks] Missing/wrong parameters to lock_allow_dig");
+      return false;
+   end
+
+   local meta = minetest.env:get_meta(pos);
+   local lock_owner = meta:get_string("owner");
+
+   -- locks who lost their owner can be opened/digged by anyone
+   if( meta == nil or lock_owner == nil or lock_owner == "") then
+      return true;
+   end
+
+   -- the owner can dig up his own locked objects
+   if( player:get_player_name() == meta:get_string("owner")) then
+      return true;
+   end
+   
+   -- players with diglocks priv can dig up locked objects as well
+   if( minetest.check_player_privs(player:get_player_name(), {diglocks=true})) then
+     return true;
+   end
+
+   return false; -- fallback
+end
+    
+
+-- The locked object can only be used (i.e. opened, stuff taken out, changed, ... - depends on object) if this
+-- function returns true. Call it wherever appropriate (usually in on_punch in register_node). Example:
+--        on_punch = function(pos,player)
+--               if( !locks:lock_allow_use( pos, player ) then
+--                  print( "Sorry, you have no access here.");
+--               else
+--                  do_what_this_object_is_good_for( pos, puncher );
+--               end
+--        end
+
+function locks:lock_allow_use( pos, player )
+
+   if( pos == nil or player == nil ) then
+      print( "Error: [locks] Missing/wrong parameters to lock_allow_use");
+      return false;
+   end
+
+   local name = player:get_player_name();
+   local meta = minetest.env:get_meta(pos);
+
+   -- pipeworks sends a special username
+   if( player.is_fake_player) then
+      if( locks:lock_allow_dig( pos, player ) and meta:get_int( 'allow_pipeworks' ) == 1 ) then
+         return true;
+      else
+         return false;
+      end
+   end
+
+   -- the player has to have a key or a keychain to open his own shared locked objects
+   if( name == meta:get_string("owner")) then      
+
+      if(     not( player:get_inventory():contains_item("main","locks:keychain 1"))
+          and not( player:get_inventory():contains_item("main","locks:key 1"))) then
+          minetest.chat_send_player( name, "You do not have a key or a keychain. Without that you can't use your shared locked objects!");
+          return false;
+      end
+
+   -- the player has to have a keychain to open shared locked objects of other players
+   else 
+
+      if( not( player:get_inventory():contains_item("main","locks:keychain 1"))) then
+         minetest.chat_send_player(name, "You do not have a keychain. Without that you can't open shared locked objects of other players!");
+         return false;
+      end
+   end
+      
+   -- if the user would even be allowed to dig this node up, using the node is allowed as well 
+   if( locks:lock_allow_dig( pos, player )) then
+      return true;
+   end
+
+
+   if( meta == nil ) then
+      minetest.chat_send_player( name, "Error: Could not access metadata of this shared locked object.");
+      return false;
+   end
+
+   -- players with openlocks priv can open locked objects 
+   if( minetest.check_player_privs(name, {openlocks=true})) then
+      return true;
+   end
+
+   -- the player might be specificly allowed to use this object through allowed_users
+   local liste = meta:get_string("allowed_users"):split( "," );
+   for i in ipairs( liste ) do
+ 
+      if( liste[i] == name ) then
+         return true;
+      end
+
+      -- the player might member of a playergroup that is allowed to use this object
+      if( liste[i]:sub(1,1) == ":"
+        and playergroups ~= nil
+        and playergroups:is_group_member( meta:get_string("owner"), liste[i]:sub(2), name )) then
+         return true;
+      end
+
+   end
+
+
+   -- the player may have entered the right password
+   if( name == meta:get_string("pw_user")) then
+      return true;
+   end
+
+   -- the lock may have a password set. If this is the case then ask the user for it
+   if( meta:get_string( "password" ) and meta:get_string( "password" ) ~= "" ) then
+      minetest.chat_send_player(name, "Access denied. Right-click and enter password first!");
+      return false;
+   end
+
+   return false; -- fallback
+
+end
+
+
+
+-- Method for the lock to get password and configuration data
+-- Call in on_receive_fields in register_node. Example:
+--        on_receive_fields = function(pos, formname, fields, sender)
+--                locks:lock_handle_input( pos, formname, fields, sender );
+--        end,
+function locks:lock_handle_input( pos, formname, fields, player )
+
+   if( pos == nil or player == nil ) then
+      print( "Error: [locks] Missing/wrong parameters to lock_handle_input");
+      return false;
+   end
+
+   local meta = minetest.env:get_meta(pos);
+   if( meta == nil ) then
+      print( "Error: [locks] lock_handle_input: unable to get meta data");
+      return;
+   end
+
+   -- is this input the lock is supposed to handle?
+   if(  ( not( fields.locks_sent_lock_command )
+       or fields.locks_sent_lock_command == "" )
+      and (fields.quit and (fields.quit==true or fields.quit=='true'))) then
+--    or not( fields.locks_sent_input )
+     return;
+   end
+
+   name = player:get_player_name();
+
+   if( fields.locks_sent_lock_command == "/help" ) then
+
+      if( name == meta:get_string( "owner" )) then
+         minetest.chat_send_player(name, "The following commands are available to you, the owner of this object, only:\n"..
+            "  /help           Shows this help text.\n"..
+            "  /add <name>     Player <name> can now unlock this object with any key.\n"..
+            "  /del <name>     Player <name> can no longer use this object.\n"..
+            "  /list           Shows a list of players who can use this object.\n"..
+            "  /set <password> Sets a password. Everyone who types that in can use the object.\n"..
+            "  /pipeworks      Toggles permission for pipeworks to take inventory out of the shared locked object.\n");
+
+      else if( locks:lock_allow_use( pos, player )) then
+         minetest.chat_send_player(name, "This locked object is owned by "..tostring( meta:get_string( "owner" ))..".\n"..
+            "You do have access to it.\n");
+
+      else if( meta:get_string( "password" ) ~= "" ) then
+         minetest.chat_send_player(name, "This locked object is owned by "..tostring( meta:get_string( "owner" ))..".\n"..
+            "Enter the correct password to gain access.\n");
+
+      else
+         minetest.chat_send_player(name, "This locked object is owned by "..tostring( meta:get_string( "owner" ))..".\n"..
+            "There is no password set. You can only gain access if the owner grants it to you.");
+
+      end end end -- lua is not the most intuitive language here....
+      return;
+   end -- of /help
+
+   -- sanitize player input
+   if( fields.locks_sent_lock_command:match("[^%a%d%s_%- /%:]")) then
+      minetest.chat_send_player(name, "Input contains unsupported characters. Allowed: a-z, A-Z, 0-9, _, -, :.");
+      return;
+   end
+    
+   if( #fields.locks_sent_lock_command > 60) then
+      minetest.chat_send_player(name, "Input too long. Only up to 80 characters supported.");
+      return;
+   end
+   
+
+   local password = meta:get_string("password");
+   -- other players can only try to input the correct password
+   if( name ~= meta:get_string( "owner" )
+       or (password and password ~= "" and password==fields.locks_sent_lock_command)
+       or (name==meta:get_string("pw_user"))) then 
+
+      -- no need to bother with trying other PWs if none is set...
+      if( meta:get_string("password")=="" ) then
+          minetest.chat_send_player(name, "There is no password set. Access denied.");
+          return;
+      end
+
+      -- the player may have entered the right password already
+      if( name == meta:get_string("pw_user")) then
+         -- nothing to do - the player entered the right pw alredy
+          minetest.chat_send_player(name, "You have entered the right password already. Access granted.");
+         return;
+      end
+
+      if( fields.locks_sent_lock_command ~= meta:get_string("password")) then
+          minetest.chat_send_player(name, "Wrong password. Access denied.");
+         return;
+      end
+
+      -- store the last user (this one) who entered the right pw
+      meta:set_string( "pw_user", name );
+
+      minetest.chat_send_player(name, "Password confirmed. Access granted.");
+      return;
+   end
+ 
+   local txt = "";
+
+
+   if( fields.locks_sent_lock_command == "/list" ) then
+
+      if( meta:get_string("allowed_users")=="" ) then
+         txt = "No other users are allowed to use this object (except those with global privs like moderators/admins).";
+      else
+         txt = "You granted the following users/groups of users access to this object:\n";
+         local liste = meta:get_string("allowed_users"):split( "," );
+         for i in ipairs( liste ) do
+            txt = txt.."   "..tostring(liste[i]);
+         end
+      end
+
+      if( meta:get_string( "password" ) == "" ) then
+         txt = txt.."\nThere is no password set. That means no one can get access through a password.";  
+      else
+         txt = txt.."\nThe password for this lock is: \""..tostring( meta:get_string( "password" ).."\"");
+      end
+
+      if( not( minetest.get_modpath("pipeworks") )) then
+         txt = txt.."\nThe pipeworks mod is not installed. Install it if you wish support for tubes.";
+      elseif( meta:get_int( "allow_pipeworks" ) == 1 ) then
+         txt = txt.."\nTubes from pipeworks may be used to extract items out of/add items to this shared locked object.";
+      else
+         txt = txt.."\nInput from tubes is accepted, but output to them is denied (default).";
+      end
+
+      minetest.chat_send_player(name, txt );
+      return;
+   end -- of /list
+
+
+   -- toggle tube output on/off
+   if( fields.locks_sent_lock_command == "/pipeworks" ) then
+
+      if( meta:get_int('allow_pipeworks') == 1 ) then
+         meta:set_int('allow_pipeworks', 0 );
+         minetest.chat_send_player( name, 'Output to pipework tubes is now DISABLED (input is still acceped).');
+         return;
+      else
+         meta:set_int('allow_pipeworks', 1 );
+         minetest.chat_send_player( name, 'Output to pipework tubes is now ENABLED. Connected tubes may insert and remove items.');
+         return;
+      end
+   end
+
+--   -- all other commands take exactly one parameter
+   local help = fields.locks_sent_lock_command:split( " " );
+   
+   print( tostring( help[1] ));
+   print( tostring( help[2] ));
+
+     
+   -- set/change a password
+   if( help[1]=="/set" ) then
+
+      -- if empty password then delete it
+      if( help[2]==nil ) then
+         help[2] = "";
+      end
+
+      minetest.chat_send_player(name, "Old password: \""..tostring( meta:get_string( "password" ))..
+                      "\"\n Changed to new password: \""..tostring( help[2]).."\".");
+
+
+      meta:set_string( "password", help[2]); 
+      -- reset the list of users who typed the right password
+      meta:set_string("pw_users","");
+
+      if( help[2]=="") then
+         minetest.chat_send_player(name, "The password is empty and thus will be disabled.");
+      end
+      return;
+   end
+
+   if( help[2]==nil or help[2]=="") then
+      minetest.chat_send_player(name, "Error: Missing parameter (player name) for command \""..tostring( help[1] ).."\"." );
+      return;
+   end
+
+   -- for add and del: check if the player is already in the list
+
+   local found = false;
+   local anz   = 0;
+   local liste = meta:get_string("allowed_users"):split( "," );
+   for i in ipairs( liste ) do
+
+      anz = anz + 1; -- count players 
+      if( tostring( liste[i] ) == help[2] ) then
+          found = true;
+      end
+
+   end
+
+   if( help[1]=="/add" and found==true ) then
+      minetest.chat_send_player(name, "Player \""..tostring( help[2] ).."\" is already allowed to use this locked object. Nothing to do.");
+      return;
+   end
+      
+   if( help[1]=="/del" and found==false) then
+      minetest.chat_send_player(name, "Player \""..tostring( help[2] ).."\" is not amongst the players allowed to use this locked object. Nothing to do.");
+      return;
+   end
+
+
+   if( help[1]=="/add" ) then
+
+      if( anz >= 6 ) then
+         minetest.chat_send_player(name, "Sorry, no more players can be added. To save space, only up to 6 players can be added. For more players please use groups!");
+         return;
+      end
+
+      if( name == help[2] ) then
+         minetest.chat_send_player(name, "You are already owner of this object.");
+         return;
+      end
+        
+      -- the player might try to add a playergroup
+      if( help[2]:sub(1,1) == ":" ) then
+          
+         if( not( playergroups )) then
+            minetest.chat_send_player(name, "Sorry, this server does not support playergroups.");
+            return;
+         end
+
+         if( #help[2]<2 ) then
+            minetest.chat_send_player(name, "Please specify the name of the playergroup you want to add!");
+            return;
+         end
+
+         if( not( playergroups:is_playergroup(meta:get_string("owner"), help[2]:sub(2) ))) then
+            minetest.chat_send_player(name, "You do not have a playergroup named \""..tostring( help[2]:sub(2)).."\".");
+            return;
+         end
+ 
+      else
+            
+         -- check if the player exists
+         local privs = minetest.get_player_privs( help[2] );
+         if( not( privs ) or not( privs.interact )) then
+            minetest.chat_send_player(name, "Player \""..help[2].."\" not found or has no interact privs.");
+            return;
+         end
+      end
+        
+      meta:set_string( "allowed_users", meta:get_string("allowed_users")..","..help[2] );
+
+      if( help[2]:sub(1,1) == ":" ) then
+         minetest.chat_send_player(name, "All members of your playergroup "..tostring(help[2]:sub(2)).." may now use/access this locked object.");
+      else
+         minetest.chat_send_player(name, help[2].." may now use/access this locked object.");
+      end
+      return;
+   end
+
+
+   if( help[1]=="/del" ) then
+
+      userlist  = meta:get_string("allowed_users"):split( ","..help[2] );
+      meta:set_string( "allowed_users", ( userlist[1] or "" )..(userlist[2] or "" ));
+      
+      minetest.chat_send_player(name, "Access for player \""..tostring(help[2]).."\" has been revoked.");
+      return;
+   end
+
+   minetest.chat_send_player(name, "Error: Command \""..tostring(help[1]).."\" not understood.");
+end
+
+
+
+-- craftitem; that can be used to craft shared locked objects
+minetest.register_craftitem("locks:lock", {
+        description = "Lock to lock and share objects",
+        image = "locks_lock16.png",
+});
+
+
+minetest.register_craft({
+        output = "locks:lock 2",
+        recipe = {
+                 {'default:steel_ingot', 'default:steel_ingot','default:steel_ingot'},
+                 {'default:steel_ingot', '',                   'default:steel_ingot'},
+                 {'',                    'default:steel_ingot',''},
+                }
+        });
+
+
+-- a key allowes to open your own shared locked objects
+minetest.register_craftitem("locks:key", {
+        description = "Key to open your own shared locked objects",
+        image = "locks_key32.png",
+});
+
+minetest.register_craft({
+        output = "locks:key",
+        recipe = {
+                 {'',                    'default:stick',      ''},
+                 {'',                    'default:steel_ingot',''},
+                }
+        });
+
+
+
+-- in order to open shared locked objects of other players, a keychain is needed (plus the owner has to admit it via /add playername or through /set password)
+minetest.register_craftitem("locks:keychain", {
+        description = "Keychain to open shared locked objects of others",
+        image = "locks_keychain32.png",
+});
+
+minetest.register_craft({
+        output = "locks:keychain",
+        recipe = {
+                 {'',                    'default:steel_ingot', '' },
+                 {'locks:key',           'locks:key',           'locks:key'},
+                }
+        });
+
+dofile(minetest.get_modpath("locks").."/shared_locked_chest.lua");
+dofile(minetest.get_modpath("locks").."/shared_locked_sign_wall.lua");
+dofile(minetest.get_modpath("locks").."/shared_locked_xdoors2.lua");
+dofile(minetest.get_modpath("locks").."/shared_locked_furnace.lua");
+
+