Fix default item callbacks to work with nil users (#5819)

* Fix default item callbacks to work with nil users

* item.lua: Handle node drops for invalid players

The if-condition for the dropping loop is the same as `inv`, which means that the 2nd possible definition of `give_item` is never used.
Remove redundant `local _, dropped_item`

diff --git a/builtin/game/chatcommands.lua b/builtin/game/chatcommands.lua
index 81cb76eafd6393cbf3c82de6d5710c53935995ca..cbfe2fb257bb82412a26fa0228f1116f71e0d352 100644 (file)
--- a/builtin/game/chatcommands.lua
+++ b/builtin/game/chatcommands.lua
@@ -667,8 +667,8 @@ core.register_chatcommand("pulverize", {
 core.rollback_punch_callbacks = {}
 
 core.register_on_punchnode(function(pos, node, puncher)
-       local name = puncher:get_player_name()
-       if core.rollback_punch_callbacks[name] then
+       local name = puncher and puncher:get_player_name()
+       if name and core.rollback_punch_callbacks[name] then
                core.rollback_punch_callbacks[name](pos, node, puncher)
                core.rollback_punch_callbacks[name] = nil
        end

diff --git a/builtin/game/item.lua b/builtin/game/item.lua
index 03eee3a6167e89325c365ef9f64e55ed9ed89f81..c7cbdd988c141bbf24274e7f017f9115bd082cd2 100644 (file)
--- a/builtin/game/item.lua
+++ b/builtin/game/item.lua
@@ -215,6 +215,8 @@ function core.get_node_drops(node, toolname)
                end
                if item.tools ~= nil then
                        good_tool = false
+               end
+               if item.tools ~= nil and toolname then
                        for _, tool in ipairs(item.tools) do
                                if tool:sub(1, 1) == '~' then
                                        good_tool = toolname:find(tool:sub(2)) ~= nil
@@ -225,7 +227,7 @@ function core.get_node_drops(node, toolname)
                                        break
                                end
                        end
-               end
+               end
                if good_rarity and good_tool then
                        got_count = got_count + 1
                        for _, add_item in ipairs(item.items) do
@@ -245,6 +247,20 @@ function core.get_node_drops(node, toolname)
        return got_items
 end
 
+local function user_name(user)
+       return user and user:get_player_name() or ""
+end
+
+local function is_protected(pos, name)
+       return core.is_protected(pos, name) and
+               not minetest.check_player_privs(name, "protection_bypass")
+end
+
+-- Returns a logging function. For empty names, does not log.
+local function make_log(name)
+       return name ~= "" and core.log or function() end
+end
+
 function core.item_place_node(itemstack, placer, pointed_thing, param2)
        local def = itemstack:get_definition()
        if def.type ~= "node" or pointed_thing.type ~= "node" then
@@ -255,10 +271,11 @@ function core.item_place_node(itemstack, placer, pointed_thing, param2)
        local oldnode_under = core.get_node_or_nil(under)
        local above = pointed_thing.above
        local oldnode_above = core.get_node_or_nil(above)
-       local playername = placer:get_player_name()
+       local playername = user_name(placer)
+       local log = make_log(playername)
 
        if not oldnode_under or not oldnode_above then
-               core.log("info", playername .. " tried to place"
+               log("info", playername .. " tried to place"
                        .. " node in unloaded position " .. core.pos_to_string(above))
                return itemstack, false
        end
@@ -269,7 +286,7 @@ function core.item_place_node(itemstack, placer, pointed_thing, param2)
        olddef_above = olddef_above or core.nodedef_default
 
        if not olddef_above.buildable_to and not olddef_under.buildable_to then
-               core.log("info", playername .. " tried to place"
+               log("info", playername .. " tried to place"
                        .. " node in invalid position " .. core.pos_to_string(above)
                        .. ", replacing " .. oldnode_above.name)
                return itemstack, false
@@ -280,13 +297,12 @@ function core.item_place_node(itemstack, placer, pointed_thing, param2)
 
        -- If node under is buildable_to, place into it instead (eg. snow)
        if olddef_under.buildable_to then
-               core.log("info", "node under is buildable to")
+               log("info", "node under is buildable to")
                place_to = {x = under.x, y = under.y, z = under.z}
        end
 
-       if core.is_protected(place_to, playername) and
-                       not minetest.check_player_privs(placer, "protection_bypass") then
-               core.log("action", playername
+       if is_protected(place_to, playername) then
+               log("action", playername
                                .. " tried to place " .. def.name
                                .. " at protected position "
                                .. core.pos_to_string(place_to))
@@ -294,7 +310,7 @@ function core.item_place_node(itemstack, placer, pointed_thing, param2)
                return itemstack
        end
 
-       core.log("action", playername .. " places node "
+       log("action", playername .. " places node "
                .. def.name .. " at " .. core.pos_to_string(place_to))
 
        local oldnode = core.get_node(place_to)
@@ -314,7 +330,7 @@ function core.item_place_node(itemstack, placer, pointed_thing, param2)
        -- Calculate the direction for furnaces and chests and stuff
        elseif (def.paramtype2 == "facedir" or
                        def.paramtype2 == "colorfacedir") and not param2 then
-               local placer_pos = placer:getpos()
+               local placer_pos = placer and placer:getpos()
                if placer_pos then
                        local dir = {
                                x = above.x - placer_pos.x,
@@ -322,7 +338,7 @@ function core.item_place_node(itemstack, placer, pointed_thing, param2)
                                z = above.z - placer_pos.z
                        }
                        newnode.param2 = core.dir_to_facedir(dir)
-                       core.log("action", "facedir: " .. newnode.param2)
+                       log("action", "facedir: " .. newnode.param2)
                end
        end
 
@@ -348,7 +364,7 @@ function core.item_place_node(itemstack, placer, pointed_thing, param2)
        -- Check if the node is attached and if it can be placed there
        if core.get_item_group(def.name, "attached_node") ~= 0 and
                not builtin_shared.check_attached_node(place_to, newnode) then
-               core.log("action", "attached node " .. def.name ..
+               log("action", "attached node " .. def.name ..
                        " can not be placed at " .. core.pos_to_string(place_to))
                return itemstack, false
        end
@@ -419,25 +435,24 @@ function core.item_secondary_use(itemstack, placer)
 end
 
 function core.item_drop(itemstack, dropper, pos)
-       if dropper and dropper:is_player() then
-               local dir = dropper:get_look_dir()
-               local p = {x = pos.x, y = pos.y + 1.2, z = pos.z}
-               local cnt = itemstack:get_count()
-               local item = itemstack:take_item(cnt)
-               local obj = core.add_item(p, item)
-               if obj then
+       local dropper_is_player = dropper and dropper:is_player()
+       local p = table.copy(pos)
+       local cnt = itemstack:get_count()
+       if dropper_is_player then
+               p.y = p.y + 1.2
+       end
+       local item = itemstack:take_item(cnt)
+       local obj = core.add_item(p, item)
+       if obj then
+               if dropper_is_player then
+                       local dir = dropper:get_look_dir()
                        dir.x = dir.x * 2.9
                        dir.y = dir.y * 2.9 + 2
                        dir.z = dir.z * 2.9
                        obj:set_velocity(dir)
                        obj:get_luaentity().dropped_by = dropper:get_player_name()
-                       return itemstack
-               end
-
-       else
-               if core.add_item(pos, itemstack) then
-                       return itemstack
                end
+               return itemstack
        end
        -- If we reach this, adding the object to the
        -- environment failed
@@ -458,7 +473,8 @@ function core.do_item_eat(hp_change, replace_with_item, itemstack, user, pointed
                                itemstack:add_item(replace_with_item)
                        else
                                local inv = user:get_inventory()
-                               if inv:room_for_item("main", {name=replace_with_item}) then
+                               -- Check if inv is null, since non-players don't have one
+                               if inv and inv:room_for_item("main", {name=replace_with_item}) then
                                        inv:add_item("main", replace_with_item)
                                else
                                        local pos = user:getpos()
@@ -473,7 +489,9 @@ end
 
 function core.item_eat(hp_change, replace_with_item)
        return function(itemstack, user, pointed_thing)  -- closure
-               return core.do_item_eat(hp_change, replace_with_item, itemstack, user, pointed_thing)
+               if user then
+                       return core.do_item_eat(hp_change, replace_with_item, itemstack, user, pointed_thing)
+               end
        end
 end
 
@@ -490,63 +508,75 @@ end
 
 function core.handle_node_drops(pos, drops, digger)
        -- Add dropped items to object's inventory
-       if digger:get_inventory() then
-               local _, dropped_item
-               for _, dropped_item in ipairs(drops) do
-                       local left = digger:get_inventory():add_item("main", dropped_item)
-                       if not left:is_empty() then
-                               local p = {
-                                       x = pos.x + math.random()/2-0.25,
-                                       y = pos.y + math.random()/2-0.25,
-                                       z = pos.z + math.random()/2-0.25,
-                               }
-                               core.add_item(p, left)
-                       end
+       local inv = digger and digger:get_inventory()
+       local give_item
+       if inv then
+               give_item = function(item)
+                       return inv:add_item("main", item)
+               end
+       else
+               give_item = function(item)
+                       return item
+               end
+       end
+
+       for _, dropped_item in pairs(drops) do
+               local left = give_item(dropped_item)
+               if not left:is_empty() then
+                       local p = {
+                               x = pos.x + math.random()/2-0.25,
+                               y = pos.y + math.random()/2-0.25,
+                               z = pos.z + math.random()/2-0.25,
+                       }
+                       core.add_item(p, left)
                end
        end
 end
 
 function core.node_dig(pos, node, digger)
+       local diggername = user_name(digger)
+       local log = make_log(diggername)
        local def = core.registered_nodes[node.name]
        if def and (not def.diggable or
                        (def.can_dig and not def.can_dig(pos, digger))) then
-               core.log("info", digger:get_player_name() .. " tried to dig "
+               log("info", diggername .. " tried to dig "
                        .. node.name .. " which is not diggable "
                        .. core.pos_to_string(pos))
                return
        end
 
-       if core.is_protected(pos, digger:get_player_name()) and
-                       not minetest.check_player_privs(digger, "protection_bypass") then
-               core.log("action", digger:get_player_name()
+       if is_protected(pos, diggername) then
+               log("action", diggername
                                .. " tried to dig " .. node.name
                                .. " at protected position "
                                .. core.pos_to_string(pos))
-               core.record_protection_violation(pos, digger:get_player_name())
+               core.record_protection_violation(pos, diggername)
                return
        end
 
-       core.log('action', digger:get_player_name() .. " digs "
+       log('action', diggername .. " digs "
                .. node.name .. " at " .. core.pos_to_string(pos))
 
-       local wielded = digger:get_wielded_item()
-       local drops = core.get_node_drops(node, wielded:get_name())
+       local wielded = digger and digger:get_wielded_item()
+       local drops = core.get_node_drops(node, wielded and wielded:get_name())
 
-       local wdef = wielded:get_definition()
-       local tp = wielded:get_tool_capabilities()
-       local dp = core.get_dig_params(def and def.groups, tp)
-       if wdef and wdef.after_use then
-               wielded = wdef.after_use(wielded, digger, node, dp) or wielded
-       else
-               -- Wear out tool
-               if not core.settings:get_bool("creative_mode") then
-                       wielded:add_wear(dp.wear)
-                       if wielded:get_count() == 0 and wdef.sound and wdef.sound.breaks then
-                               core.sound_play(wdef.sound.breaks, {pos = pos, gain = 0.5})
+       if wielded then
+               local wdef = wielded:get_definition()
+               local tp = wielded:get_tool_capabilities()
+               local dp = core.get_dig_params(def and def.groups, tp)
+               if wdef and wdef.after_use then
+                       wielded = wdef.after_use(wielded, digger, node, dp) or wielded
+               else
+                       -- Wear out tool
+                       if not core.settings:get_bool("creative_mode") then
+                               wielded:add_wear(dp.wear)
+                               if wielded:get_count() == 0 and wdef.sound and wdef.sound.breaks then
+                                       core.sound_play(wdef.sound.breaks, {pos = pos, gain = 0.5})
+                               end
                        end
                end
+               digger:set_wielded_item(wielded)
        end
-       digger:set_wielded_item(wielded)
 
        -- Handle drops
        core.handle_node_drops(pos, drops, digger)

diff --git a/doc/lua_api.txt b/doc/lua_api.txt
index eaec904924e49d3196ad7f8d87c0d17f73f00563..6109f082bb011bc9bdc9c3478c9265e4b90d66c7 100644 (file)
--- a/doc/lua_api.txt
+++ b/doc/lua_api.txt
@@ -2444,6 +2444,7 @@ Call these functions only at load time!
 * `minetest.register_on_placenode(func(pos, newnode, placer, oldnode, itemstack, pointed_thing))`
     * Called when a node has been placed
     * If return `true` no item is taken from `itemstack`
+    * `placer` may be any valid ObjectRef or nil.
     * **Not recommended**; use `on_construct` or `after_place_node` in node definition
       whenever possible
 * `minetest.register_on_dignode(func(pos, oldnode, digger))`
@@ -3219,6 +3220,7 @@ These functions return the leftover itemstack.
     * Returns true, if player `name` shouldn't be abled to dig at `pos` or do other
       actions, defineable by mods, due to some mod-defined ownership-like concept.
       Returns false or nil, if the player is allowed to do such actions.
+    * `name` will be "" for non-players or unknown players.
     * This function should be overridden by protection mods and should be used to
       check if a player can interact at a position.
     * This function should call the old version of itself if the position is not
@@ -4608,6 +4610,7 @@ Definition tables
         ^ Called after constructing node when node was placed using
           minetest.item_place_node / minetest.place_node
         ^ If return true no item is taken from itemstack
+       ^ `placer` may be any valid ObjectRef or nil
         ^ default: nil ]]
         after_dig_node = func(pos, oldnode, oldmetadata, digger), --[[
         ^ oldmetadata is in table format

diff --git a/games/minimal/mods/default/init.lua b/games/minimal/mods/default/init.lua
index fcdf93547f32e6f7845b3b1b88705e1f983d0b40..bfd938211258d8b7ef23502df1764a11bb6ec8c8 100644 (file)
--- a/games/minimal/mods/default/init.lua
+++ b/games/minimal/mods/default/init.lua
@@ -1270,7 +1270,9 @@ minetest.register_node("default:chest_locked", {
        sounds = default.node_sound_wood_defaults(),
        after_place_node = function(pos, placer)
                local meta = minetest.get_meta(pos)
-               meta:set_string("owner", placer:get_player_name() or "")
+               local pname =
+                       placer and placer:get_player_name() or ""
+               meta:set_string("owner", pname)
                meta:set_string("infotext", "Locked Chest (owned by "..
                                meta:get_string("owner")..")")
        end,