builtin/game/chatcommands.lua

   1 -- Minetest: builtin/game/chatcommands.lua
   2
   3 --
   4 -- Chat command handler
   5 --
   6
   7 core.chatcommands = core.registered_chatcommands -- BACKWARDS COMPATIBILITY
   8
   9 core.register_on_chat_message(function(name, message)
  10         if message:sub(1,1) ~= "/" then
  11                 return
  12         end
  13
  14         local cmd, param = string.match(message, "^/([^ ]+) *(.*)")
  15         if not cmd then
  16                 core.chat_send_player(name, "-!- Empty command")
  17                 return true
  18         end
  19
  20         param = param or ""
  21
  22         local cmd_def = core.registered_chatcommands[cmd]
  23         if not cmd_def then
  24                 core.chat_send_player(name, "-!- Invalid command: " .. cmd)
  25                 return true
  26         end
  27         local has_privs, missing_privs = core.check_player_privs(name, cmd_def.privs)
  28         if has_privs then
  29                 core.set_last_run_mod(cmd_def.mod_origin)
  30                 local success, message = cmd_def.func(name, param)
  31                 if message then
  32                         core.chat_send_player(name, message)
  33                 end
  34         else
  35                 core.chat_send_player(name, "You don't have permission"
  36                                 .. " to run this command (missing privileges: "
  37                                 .. table.concat(missing_privs, ", ") .. ")")
  38         end
  39         return true  -- Handled chat message
  40 end)
  41
  42 if core.settings:get_bool("profiler.load") then
  43         -- Run after register_chatcommand and its register_on_chat_message
  44         -- Before any chatcommands that should be profiled
  45         profiler.init_chatcommand()
  46 end
  47
  48 -- Parses a "range" string in the format of "here (number)" or
  49 -- "(x1, y1, z1) (x2, y2, z2)", returning two position vectors
  50 local function parse_range_str(player_name, str)
  51         local p1, p2
  52         local args = str:split(" ")
  53
  54         if args[1] == "here" then
  55                 p1, p2 = core.get_player_radius_area(player_name, tonumber(args[2]))
  56                 if p1 == nil then
  57                         return false, "Unable to get player " .. player_name .. " position"
  58                 end
  59         else
  60                 p1, p2 = core.string_to_area(str)
  61                 if p1 == nil then
  62                         return false, "Incorrect area format. Expected: (x1,y1,z1) (x2,y2,z2)"
  63                 end
  64         end
  65
  66         return p1, p2
  67 end
  68
  69 --
  70 -- Chat commands
  71 --
  72 core.register_chatcommand("me", {
  73         params = "<action>",
  74         description = "Show chat action (e.g., '/me orders a pizza' displays"
  75                         .. " '<player name> orders a pizza')",
  76         privs = {shout=true},
  77         func = function(name, param)
  78                 core.chat_send_all("* " .. name .. " " .. param)
  79         end,
  80 })
  81
  82 core.register_chatcommand("admin", {
  83         description = "Show the name of the server owner",
  84         func = function(name)
  85                 local admin = core.settings:get("name")
  86                 if admin then
  87                         return true, "The administrator of this server is "..admin.."."
  88                 else
  89                         return false, "There's no administrator named in the config file."
  90                 end
  91         end,
  92 })
  93
  94 core.register_chatcommand("privs", {
  95         params = "[<name>]",
  96         description = "Show privileges of yourself or another player",
  97         func = function(caller, param)
  98                 param = param:trim()
  99                 local name = (param ~= "" and param or caller)
 100                 return true, "Privileges of " .. name .. ": "
 101                         .. core.privs_to_string(
 102                                 core.get_player_privs(name), ' ')
 103         end,
 104 })
 105
 106 core.register_chatcommand("hasprivs", {
 107         params = "<privilege>",
 108         description = "Return list of all online players with privilege.",
 109         privs = {basic_privs = true},
 110         func = function(caller, param)
 111                 param = param:trim()
 112                 if param == "" then
 113                         return false, "Invalid parameters (see /help hasprivs)"
 114                 end
 115                 if not core.registered_privileges[param] then
 116                         return false, "Unknown privilege!"
 117                 end
 118                 local privs = core.string_to_privs(param)
 119                 local players_with_privs = {}
 120                 for _, player in pairs(core.get_connected_players()) do
 121                         local player_name = player:get_player_name()
 122                         if core.check_player_privs(player_name, privs) then
 123                                 table.insert(players_with_privs, player_name)
 124                         end
 125                 end
 126                 return true, "Players online with the \"" .. param .. "\" priv: " ..
 127                         table.concat(players_with_privs, ", ")
 128         end
 129 })
 130
 131 local function handle_grant_command(caller, grantname, grantprivstr)
 132         local caller_privs = core.get_player_privs(caller)
 133         if not (caller_privs.privs or caller_privs.basic_privs) then
 134                 return false, "Your privileges are insufficient."
 135         end
 136
 137         if not core.get_auth_handler().get_auth(grantname) then
 138                 return false, "Player " .. grantname .. " does not exist."
 139         end
 140         local grantprivs = core.string_to_privs(grantprivstr)
 141         if grantprivstr == "all" then
 142                 grantprivs = core.registered_privileges
 143         end
 144         local privs = core.get_player_privs(grantname)
 145         local privs_unknown = ""
 146         local basic_privs =
 147                 core.string_to_privs(core.settings:get("basic_privs") or "interact,shout")
 148         for priv, _ in pairs(grantprivs) do
 149                 if not basic_privs[priv] and not caller_privs.privs then
 150                         return false, "Your privileges are insufficient."
 151                 end
 152                 if not core.registered_privileges[priv] then
 153                         privs_unknown = privs_unknown .. "Unknown privilege: " .. priv .. "\n"
 154                 end
 155                 privs[priv] = true
 156         end
 157         if privs_unknown ~= "" then
 158                 return false, privs_unknown
 159         end
 160         for priv, _ in pairs(grantprivs) do
 161                 core.run_priv_callbacks(grantname, priv, caller, "grant")
 162         end
 163         core.set_player_privs(grantname, privs)
 164         core.log("action", caller..' granted ('..core.privs_to_string(grantprivs, ', ')..') privileges to '..grantname)
 165         if grantname ~= caller then
 166                 core.chat_send_player(grantname, caller
 167                                 .. " granted you privileges: "
 168                                 .. core.privs_to_string(grantprivs, ' '))
 169         end
 170         return true, "Privileges of " .. grantname .. ": "
 171                 .. core.privs_to_string(
 172                         core.get_player_privs(grantname), ' ')
 173 end
 174
 175 core.register_chatcommand("grant", {
 176         params = "<name> (<privilege> | all)",
 177         description = "Give privileges to player",
 178         func = function(name, param)
 179                 local grantname, grantprivstr = string.match(param, "([^ ]+) (.+)")
 180                 if not grantname or not grantprivstr then
 181                         return false, "Invalid parameters (see /help grant)"
 182                 end
 183                 return handle_grant_command(name, grantname, grantprivstr)
 184         end,
 185 })
 186
 187 core.register_chatcommand("grantme", {
 188         params = "<privilege> | all",
 189         description = "Grant privileges to yourself",
 190         func = function(name, param)
 191                 if param == "" then
 192                         return false, "Invalid parameters (see /help grantme)"
 193                 end
 194                 return handle_grant_command(name, name, param)
 195         end,
 196 })
 197
 198 core.register_chatcommand("revoke", {
 199         params = "<name> (<privilege> | all)",
 200         description = "Remove privileges from player",
 201         privs = {},
 202         func = function(name, param)
 203                 if not core.check_player_privs(name, {privs=true}) and
 204                                 not core.check_player_privs(name, {basic_privs=true}) then
 205                         return false, "Your privileges are insufficient."
 206                 end
 207                 local revoke_name, revoke_priv_str = string.match(param, "([^ ]+) (.+)")
 208                 if not revoke_name or not revoke_priv_str then
 209                         return false, "Invalid parameters (see /help revoke)"
 210                 elseif not core.get_auth_handler().get_auth(revoke_name) then
 211                         return false, "Player " .. revoke_name .. " does not exist."
 212                 end
 213                 local revoke_privs = core.string_to_privs(revoke_priv_str)
 214                 local privs = core.get_player_privs(revoke_name)
 215                 local basic_privs =
 216                         core.string_to_privs(core.settings:get("basic_privs") or "interact,shout")
 217                 for priv, _ in pairs(revoke_privs) do
 218                         if not basic_privs[priv] and
 219                                         not core.check_player_privs(name, {privs=true}) then
 220                                 return false, "Your privileges are insufficient."
 221                         end
 222                 end
 223                 if revoke_priv_str == "all" then
 224                         revoke_privs = privs
 225                         privs = {}
 226                 else
 227                         for priv, _ in pairs(revoke_privs) do
 228                                 privs[priv] = nil
 229                         end
 230                 end
 231
 232                 for priv, _ in pairs(revoke_privs) do
 233                         core.run_priv_callbacks(revoke_name, priv, name, "revoke")
 234                 end
 235
 236                 core.set_player_privs(revoke_name, privs)
 237                 core.log("action", name..' revoked ('
 238                                 ..core.privs_to_string(revoke_privs, ', ')
 239                                 ..') privileges from '..revoke_name)
 240                 if revoke_name ~= name then
 241                         core.chat_send_player(revoke_name, name
 242                                         .. " revoked privileges from you: "
 243                                         .. core.privs_to_string(revoke_privs, ' '))
 244                 end
 245                 return true, "Privileges of " .. revoke_name .. ": "
 246                         .. core.privs_to_string(
 247                                 core.get_player_privs(revoke_name), ' ')
 248         end,
 249 })
 250
 251 core.register_chatcommand("setpassword", {
 252         params = "<name> <password>",
 253         description = "Set player's password",
 254         privs = {password=true},
 255         func = function(name, param)
 256                 local toname, raw_password = string.match(param, "^([^ ]+) +(.+)$")
 257                 if not toname then
 258                         toname = param:match("^([^ ]+) *$")
 259                         raw_password = nil
 260                 end
 261                 if not toname then
 262                         return false, "Name field required"
 263                 end
 264                 local act_str_past = "?"
 265                 local act_str_pres = "?"
 266                 if not raw_password then
 267                         core.set_player_password(toname, "")
 268                         act_str_past = "cleared"
 269                         act_str_pres = "clears"
 270                 else
 271                         core.set_player_password(toname,
 272                                         core.get_password_hash(toname,
 273                                                         raw_password))
 274                         act_str_past = "set"
 275                         act_str_pres = "sets"
 276                 end
 277                 if toname ~= name then
 278                         core.chat_send_player(toname, "Your password was "
 279                                         .. act_str_past .. " by " .. name)
 280                 end
 281
 282                 core.log("action", name .. " " .. act_str_pres
 283                 .. " password of " .. toname .. ".")
 284
 285                 return true, "Password of player \"" .. toname .. "\" " .. act_str_past
 286         end,
 287 })
 288
 289 core.register_chatcommand("clearpassword", {
 290         params = "<name>",
 291         description = "Set empty password for a player",
 292         privs = {password=true},
 293         func = function(name, param)
 294                 local toname = param
 295                 if toname == "" then
 296                         return false, "Name field required"
 297                 end
 298                 core.set_player_password(toname, '')
 299
 300                 core.log("action", name .. " clears password of " .. toname .. ".")
 301
 302                 return true, "Password of player \"" .. toname .. "\" cleared"
 303         end,
 304 })
 305
 306 core.register_chatcommand("auth_reload", {
 307         params = "",
 308         description = "Reload authentication data",
 309         privs = {server=true},
 310         func = function(name, param)
 311                 local done = core.auth_reload()
 312                 return done, (done and "Done." or "Failed.")
 313         end,
 314 })
 315
 316 core.register_chatcommand("remove_player", {
 317         params = "<name>",
 318         description = "Remove a player's data",
 319         privs = {server=true},
 320         func = function(name, param)
 321                 local toname = param
 322                 if toname == "" then
 323                         return false, "Name field required"
 324                 end
 325
 326                 local rc = core.remove_player(toname)
 327
 328                 if rc == 0 then
 329                         core.log("action", name .. " removed player data of " .. toname .. ".")
 330                         return true, "Player \"" .. toname .. "\" removed."
 331                 elseif rc == 1 then
 332                         return true, "No such player \"" .. toname .. "\" to remove."
 333                 elseif rc == 2 then
 334                         return true, "Player \"" .. toname .. "\" is connected, cannot remove."
 335                 end
 336
 337                 return false, "Unhandled remove_player return code " .. rc .. ""
 338         end,
 339 })
 340
 341 core.register_chatcommand("teleport", {
 342         params = "<X>,<Y>,<Z> | <to_name> | (<name> <X>,<Y>,<Z>) | (<name> <to_name>)",
 343         description = "Teleport to position or player",
 344         privs = {teleport=true},
 345         func = function(name, param)
 346                 -- Returns (pos, true) if found, otherwise (pos, false)
 347                 local function find_free_position_near(pos)
 348                         local tries = {
 349                                 {x=1,y=0,z=0},
 350                                 {x=-1,y=0,z=0},
 351                                 {x=0,y=0,z=1},
 352                                 {x=0,y=0,z=-1},
 353                         }
 354                         for _, d in ipairs(tries) do
 355                                 local p = {x = pos.x+d.x, y = pos.y+d.y, z = pos.z+d.z}
 356                                 local n = core.get_node_or_nil(p)
 357                                 if n and n.name then
 358                                         local def = core.registered_nodes[n.name]
 359                                         if def and not def.walkable then
 360                                                 return p, true
 361                                         end
 362                                 end
 363                         end
 364                         return pos, false
 365                 end
 366
 367                 local teleportee = nil
 368                 local p = {}
 369                 p.x, p.y, p.z = string.match(param, "^([%d.-]+)[, ] *([%d.-]+)[, ] *([%d.-]+)$")
 370                 p.x = tonumber(p.x)
 371                 p.y = tonumber(p.y)
 372                 p.z = tonumber(p.z)
 373                 if p.x and p.y and p.z then
 374                         local lm = 31000
 375                         if p.x < -lm or p.x > lm or p.y < -lm or p.y > lm or p.z < -lm or p.z > lm then
 376                                 return false, "Cannot teleport out of map bounds!"
 377                         end
 378                         teleportee = core.get_player_by_name(name)
 379                         if teleportee then
 380                                 teleportee:setpos(p)
 381                                 return true, "Teleporting to "..core.pos_to_string(p)
 382                         end
 383                 end
 384
 385                 local teleportee = nil
 386                 local p = nil
 387                 local target_name = nil
 388                 target_name = param:match("^([^ ]+)$")
 389                 teleportee = core.get_player_by_name(name)
 390                 if target_name then
 391                         local target = core.get_player_by_name(target_name)
 392                         if target then
 393                                 p = target:getpos()
 394                         end
 395                 end
 396                 if teleportee and p then
 397                         p = find_free_position_near(p)
 398                         teleportee:setpos(p)
 399                         return true, "Teleporting to " .. target_name
 400                                         .. " at "..core.pos_to_string(p)
 401                 end
 402
 403                 if not core.check_player_privs(name, {bring=true}) then
 404                         return false, "You don't have permission to teleport other players (missing bring privilege)"
 405                 end
 406
 407                 local teleportee = nil
 408                 local p = {}
 409                 local teleportee_name = nil
 410                 teleportee_name, p.x, p.y, p.z = param:match(
 411                                 "^([^ ]+) +([%d.-]+)[, ] *([%d.-]+)[, ] *([%d.-]+)$")
 412                 p.x, p.y, p.z = tonumber(p.x), tonumber(p.y), tonumber(p.z)
 413                 if teleportee_name then
 414                         teleportee = core.get_player_by_name(teleportee_name)
 415                 end
 416                 if teleportee and p.x and p.y and p.z then
 417                         teleportee:setpos(p)
 418                         return true, "Teleporting " .. teleportee_name
 419                                         .. " to " .. core.pos_to_string(p)
 420                 end
 421
 422                 local teleportee = nil
 423                 local p = nil
 424                 local teleportee_name = nil
 425                 local target_name = nil
 426                 teleportee_name, target_name = string.match(param, "^([^ ]+) +([^ ]+)$")
 427                 if teleportee_name then
 428                         teleportee = core.get_player_by_name(teleportee_name)
 429                 end
 430                 if target_name then
 431                         local target = core.get_player_by_name(target_name)
 432                         if target then
 433                                 p = target:getpos()
 434                         end
 435                 end
 436                 if teleportee and p then
 437                         p = find_free_position_near(p)
 438                         teleportee:setpos(p)
 439                         return true, "Teleporting " .. teleportee_name
 440                                         .. " to " .. target_name
 441                                         .. " at " .. core.pos_to_string(p)
 442                 end
 443
 444                 return false, 'Invalid parameters ("' .. param
 445                                 .. '") or player not found (see /help teleport)'
 446         end,
 447 })
 448
 449 core.register_chatcommand("set", {
 450         params = "([-n] <name> <value>) | <name>",
 451         description = "Set or read server configuration setting",
 452         privs = {server=true},
 453         func = function(name, param)
 454                 local arg, setname, setvalue = string.match(param, "(-[n]) ([^ ]+) (.+)")
 455                 if arg and arg == "-n" and setname and setvalue then
 456                         core.settings:set(setname, setvalue)
 457                         return true, setname .. " = " .. setvalue
 458                 end
 459                 local setname, setvalue = string.match(param, "([^ ]+) (.+)")
 460                 if setname and setvalue then
 461                         if not core.settings:get(setname) then
 462                                 return false, "Failed. Use '/set -n <name> <value>' to create a new setting."
 463                         end
 464                         core.settings:set(setname, setvalue)
 465                         return true, setname .. " = " .. setvalue
 466                 end
 467                 local setname = string.match(param, "([^ ]+)")
 468                 if setname then
 469                         local setvalue = core.settings:get(setname)
 470                         if not setvalue then
 471                                 setvalue = "<not set>"
 472                         end
 473                         return true, setname .. " = " .. setvalue
 474                 end
 475                 return false, "Invalid parameters (see /help set)."
 476         end,
 477 })
 478
 479 local function emergeblocks_callback(pos, action, num_calls_remaining, ctx)
 480         if ctx.total_blocks == 0 then
 481                 ctx.total_blocks   = num_calls_remaining + 1
 482                 ctx.current_blocks = 0
 483         end
 484         ctx.current_blocks = ctx.current_blocks + 1
 485
 486         if ctx.current_blocks == ctx.total_blocks then
 487                 core.chat_send_player(ctx.requestor_name,
 488                         string.format("Finished emerging %d blocks in %.2fms.",
 489                         ctx.total_blocks, (os.clock() - ctx.start_time) * 1000))
 490         end
 491 end
 492
 493 local function emergeblocks_progress_update(ctx)
 494         if ctx.current_blocks ~= ctx.total_blocks then
 495                 core.chat_send_player(ctx.requestor_name,
 496                         string.format("emergeblocks update: %d/%d blocks emerged (%.1f%%)",
 497                         ctx.current_blocks, ctx.total_blocks,
 498                         (ctx.current_blocks / ctx.total_blocks) * 100))
 499
 500                 core.after(2, emergeblocks_progress_update, ctx)
 501         end
 502 end
 503
 504 core.register_chatcommand("emergeblocks", {
 505         params = "(here [<radius>]) | (<pos1> <pos2>)",
 506         description = "Load (or, if nonexistent, generate) map blocks "
 507                 .. "contained in area pos1 to pos2 (<pos1> and <pos2> must be in parentheses)",
 508         privs = {server=true},
 509         func = function(name, param)
 510                 local p1, p2 = parse_range_str(name, param)
 511                 if p1 == false then
 512                         return false, p2
 513                 end
 514
 515                 local context = {
 516                         current_blocks = 0,
 517                         total_blocks   = 0,
 518                         start_time     = os.clock(),
 519                         requestor_name = name
 520                 }
 521
 522                 core.emerge_area(p1, p2, emergeblocks_callback, context)
 523                 core.after(2, emergeblocks_progress_update, context)
 524
 525                 return true, "Started emerge of area ranging from " ..
 526                         core.pos_to_string(p1, 1) .. " to " .. core.pos_to_string(p2, 1)
 527         end,
 528 })
 529
 530 core.register_chatcommand("deleteblocks", {
 531         params = "(here [<radius>]) | (<pos1> <pos2>)",
 532         description = "Delete map blocks contained in area pos1 to pos2 "
 533                 .. "(<pos1> and <pos2> must be in parentheses)",
 534         privs = {server=true},
 535         func = function(name, param)
 536                 local p1, p2 = parse_range_str(name, param)
 537                 if p1 == false then
 538                         return false, p2
 539                 end
 540
 541                 if core.delete_area(p1, p2) then
 542                         return true, "Successfully cleared area ranging from " ..
 543                                 core.pos_to_string(p1, 1) .. " to " .. core.pos_to_string(p2, 1)
 544                 else
 545                         return false, "Failed to clear one or more blocks in area"
 546                 end
 547         end,
 548 })
 549
 550 core.register_chatcommand("fixlight", {
 551         params = "(here [<radius>]) | (<pos1> <pos2>)",
 552         description = "Resets lighting in the area between pos1 and pos2 "
 553                 .. "(<pos1> and <pos2> must be in parentheses)",
 554         privs = {server = true},
 555         func = function(name, param)
 556                 local p1, p2 = parse_range_str(name, param)
 557                 if p1 == false then
 558                         return false, p2
 559                 end
 560
 561                 if core.fix_light(p1, p2) then
 562                         return true, "Successfully reset light in the area ranging from " ..
 563                                 core.pos_to_string(p1, 1) .. " to " .. core.pos_to_string(p2, 1)
 564                 else
 565                         return false, "Failed to load one or more blocks in area"
 566                 end
 567         end,
 568 })
 569
 570 core.register_chatcommand("mods", {
 571         params = "",
 572         description = "List mods installed on the server",
 573         privs = {},
 574         func = function(name, param)
 575                 return true, table.concat(core.get_modnames(), ", ")
 576         end,
 577 })
 578
 579 local function handle_give_command(cmd, giver, receiver, stackstring)
 580         core.log("action", giver .. " invoked " .. cmd
 581                         .. ', stackstring="' .. stackstring .. '"')
 582         local itemstack = ItemStack(stackstring)
 583         if itemstack:is_empty() then
 584                 return false, "Cannot give an empty item"
 585         elseif (not itemstack:is_known()) or (itemstack:get_name() == "unknown") then
 586                 return false, "Cannot give an unknown item"
 587         -- Forbid giving 'ignore' due to unwanted side effects
 588         elseif itemstack:get_name() == "ignore" then
 589                 return false, "Giving 'ignore' is not allowed"
 590         end
 591         local receiverref = core.get_player_by_name(receiver)
 592         if receiverref == nil then
 593                 return false, receiver .. " is not a known player"
 594         end
 595         local leftover = receiverref:get_inventory():add_item("main", itemstack)
 596         local partiality
 597         if leftover:is_empty() then
 598                 partiality = ""
 599         elseif leftover:get_count() == itemstack:get_count() then
 600                 partiality = "could not be "
 601         else
 602                 partiality = "partially "
 603         end
 604         -- The actual item stack string may be different from what the "giver"
 605         -- entered (e.g. big numbers are always interpreted as 2^16-1).
 606         stackstring = itemstack:to_string()
 607         if giver == receiver then
 608                 local msg = "%q %sadded to inventory."
 609                 return true, msg:format(stackstring, partiality)
 610         else
 611                 core.chat_send_player(receiver, ("%q %sadded to inventory.")
 612                                 :format(stackstring, partiality))
 613                 local msg = "%q %sadded to %s's inventory."
 614                 return true, msg:format(stackstring, partiality, receiver)
 615         end
 616 end
 617
 618 core.register_chatcommand("give", {
 619         params = "<name> <ItemString> [<count> [<wear>]]",
 620         description = "Give item to player",
 621         privs = {give=true},
 622         func = function(name, param)
 623                 local toname, itemstring = string.match(param, "^([^ ]+) +(.+)$")
 624                 if not toname or not itemstring then
 625                         return false, "Name and ItemString required"
 626                 end
 627                 return handle_give_command("/give", name, toname, itemstring)
 628         end,
 629 })
 630
 631 core.register_chatcommand("giveme", {
 632         params = "<ItemString> [<count> [<wear>]]",
 633         description = "Give item to yourself",
 634         privs = {give=true},
 635         func = function(name, param)
 636                 local itemstring = string.match(param, "(.+)$")
 637                 if not itemstring then
 638                         return false, "ItemString required"
 639                 end
 640                 return handle_give_command("/giveme", name, name, itemstring)
 641         end,
 642 })
 643
 644 core.register_chatcommand("spawnentity", {
 645         params = "<EntityName> [<X>,<Y>,<Z>]",
 646         description = "Spawn entity at given (or your) position",
 647         privs = {give=true, interact=true},
 648         func = function(name, param)
 649                 local entityname, p = string.match(param, "^([^ ]+) *(.*)$")
 650                 if not entityname then
 651                         return false, "EntityName required"
 652                 end
 653                 core.log("action", ("%s invokes /spawnentity, entityname=%q")
 654                                 :format(name, entityname))
 655                 local player = core.get_player_by_name(name)
 656                 if player == nil then
 657                         core.log("error", "Unable to spawn entity, player is nil")
 658                         return false, "Unable to spawn entity, player is nil"
 659                 end
 660                 if not core.registered_entities[entityname] then
 661                         return false, "Cannot spawn an unknown entity"
 662                 end
 663                 if p == "" then
 664                         p = player:getpos()
 665                 else
 666                         p = core.string_to_pos(p)
 667                         if p == nil then
 668                                 return false, "Invalid parameters ('" .. param .. "')"
 669                         end
 670                 end
 671                 p.y = p.y + 1
 672                 core.add_entity(p, entityname)
 673                 return true, ("%q spawned."):format(entityname)
 674         end,
 675 })
 676
 677 core.register_chatcommand("pulverize", {
 678         params = "",
 679         description = "Destroy item in hand",
 680         func = function(name, param)
 681                 local player = core.get_player_by_name(name)
 682                 if not player then
 683                         core.log("error", "Unable to pulverize, no player.")
 684                         return false, "Unable to pulverize, no player."
 685                 end
 686                 local wielded_item = player:get_wielded_item()
 687                 if wielded_item:is_empty() then
 688                         return false, "Unable to pulverize, no item in hand."
 689                 end
 690                 core.log("action", name .. " pulverized \"" ..
 691                         wielded_item:get_name() .. " " .. wielded_item:get_count() .. "\"")
 692                 player:set_wielded_item(nil)
 693                 return true, "An item was pulverized."
 694         end,
 695 })
 696
 697 -- Key = player name
 698 core.rollback_punch_callbacks = {}
 699
 700 core.register_on_punchnode(function(pos, node, puncher)
 701         local name = puncher and puncher:get_player_name()
 702         if name and core.rollback_punch_callbacks[name] then
 703                 core.rollback_punch_callbacks[name](pos, node, puncher)
 704                 core.rollback_punch_callbacks[name] = nil
 705         end
 706 end)
 707
 708 core.register_chatcommand("rollback_check", {
 709         params = "[<range>] [<seconds>] [<limit>]",
 710         description = "Check who last touched a node or a node near it"
 711                         .. " within the time specified by <seconds>. Default: range = 0,"
 712                         .. " seconds = 86400 = 24h, limit = 5",
 713         privs = {rollback=true},
 714         func = function(name, param)
 715                 if not core.settings:get_bool("enable_rollback_recording") then
 716                         return false, "Rollback functions are disabled."
 717                 end
 718                 local range, seconds, limit =
 719                         param:match("(%d+) *(%d*) *(%d*)")
 720                 range = tonumber(range) or 0
 721                 seconds = tonumber(seconds) or 86400
 722                 limit = tonumber(limit) or 5
 723                 if limit > 100 then
 724                         return false, "That limit is too high!"
 725                 end
 726
 727                 core.rollback_punch_callbacks[name] = function(pos, node, puncher)
 728                         local name = puncher:get_player_name()
 729                         core.chat_send_player(name, "Checking " .. core.pos_to_string(pos) .. "...")
 730                         local actions = core.rollback_get_node_actions(pos, range, seconds, limit)
 731                         if not actions then
 732                                 core.chat_send_player(name, "Rollback functions are disabled")
 733                                 return
 734                         end
 735                         local num_actions = #actions
 736                         if num_actions == 0 then
 737                                 core.chat_send_player(name, "Nobody has touched"
 738                                                 .. " the specified location in "
 739                                                 .. seconds .. " seconds")
 740                                 return
 741                         end
 742                         local time = os.time()
 743                         for i = num_actions, 1, -1 do
 744                                 local action = actions[i]
 745                                 core.chat_send_player(name,
 746                                         ("%s %s %s -> %s %d seconds ago.")
 747                                                 :format(
 748                                                         core.pos_to_string(action.pos),
 749                                                         action.actor,
 750                                                         action.oldnode.name,
 751                                                         action.newnode.name,
 752                                                         time - action.time))
 753                         end
 754                 end
 755
 756                 return true, "Punch a node (range=" .. range .. ", seconds="
 757                                 .. seconds .. "s, limit=" .. limit .. ")"
 758         end,
 759 })
 760
 761 core.register_chatcommand("rollback", {
 762         params = "(<name> [<seconds>]) | (:<actor> [<seconds>])",
 763         description = "Revert actions of a player. Default for <seconds> is 60",
 764         privs = {rollback=true},
 765         func = function(name, param)
 766                 if not core.settings:get_bool("enable_rollback_recording") then
 767                         return false, "Rollback functions are disabled."
 768                 end
 769                 local target_name, seconds = string.match(param, ":([^ ]+) *(%d*)")
 770                 if not target_name then
 771                         local player_name = nil
 772                         player_name, seconds = string.match(param, "([^ ]+) *(%d*)")
 773                         if not player_name then
 774                                 return false, "Invalid parameters. See /help rollback"
 775                                                 .. " and /help rollback_check."
 776                         end
 777                         target_name = "player:"..player_name
 778                 end
 779                 seconds = tonumber(seconds) or 60
 780                 core.chat_send_player(name, "Reverting actions of "
 781                                 .. target_name .. " since "
 782                                 .. seconds .. " seconds.")
 783                 local success, log = core.rollback_revert_actions_by(
 784                                 target_name, seconds)
 785                 local response = ""
 786                 if #log > 100 then
 787                         response = "(log is too long to show)\n"
 788                 else
 789                         for _, line in pairs(log) do
 790                                 response = response .. line .. "\n"
 791                         end
 792                 end
 793                 response = response .. "Reverting actions "
 794                                 .. (success and "succeeded." or "FAILED.")
 795                 return success, response
 796         end,
 797 })
 798
 799 core.register_chatcommand("status", {
 800         description = "Show server status",
 801         func = function(name, param)
 802                 local status = core.get_server_status(name, false)
 803                 if status and status ~= "" then
 804                         return true, status
 805                 end
 806                 return false, "This command was disabled by a mod or game"
 807         end,
 808 })
 809
 810 core.register_chatcommand("time", {
 811         params = "[<0..23>:<0..59> | <0..24000>]",
 812         description = "Show or set time of day",
 813         privs = {},
 814         func = function(name, param)
 815                 if param == "" then
 816                         local current_time = math.floor(core.get_timeofday() * 1440)
 817                         local minutes = current_time % 60
 818                         local hour = (current_time - minutes) / 60
 819                         return true, ("Current time is %d:%02d"):format(hour, minutes)
 820                 end
 821                 local player_privs = core.get_player_privs(name)
 822                 if not player_privs.settime then
 823                         return false, "You don't have permission to run this command " ..
 824                                 "(missing privilege: settime)."
 825                 end
 826                 local hour, minute = param:match("^(%d+):(%d+)$")
 827                 if not hour then
 828                         local new_time = tonumber(param)
 829                         if not new_time then
 830                                 return false, "Invalid time."
 831                         end
 832                         -- Backward compatibility.
 833                         core.set_timeofday((new_time % 24000) / 24000)
 834                         core.log("action", name .. " sets time to " .. new_time)
 835                         return true, "Time of day changed."
 836                 end
 837                 hour = tonumber(hour)
 838                 minute = tonumber(minute)
 839                 if hour < 0 or hour > 23 then
 840                         return false, "Invalid hour (must be between 0 and 23 inclusive)."
 841                 elseif minute < 0 or minute > 59 then
 842                         return false, "Invalid minute (must be between 0 and 59 inclusive)."
 843                 end
 844                 core.set_timeofday((hour * 60 + minute) / 1440)
 845                 core.log("action", ("%s sets time to %d:%02d"):format(name, hour, minute))
 846                 return true, "Time of day changed."
 847         end,
 848 })
 849
 850 core.register_chatcommand("days", {
 851         description = "Show day count since world creation",
 852         func = function(name, param)
 853                 return true, "Current day is " .. core.get_day_count()
 854         end
 855 })
 856
 857 core.register_chatcommand("shutdown", {
 858         params = "[<delay_in_seconds> | -1] [reconnect] [<message>]",
 859         description = "Shutdown server (-1 cancels a delayed shutdown)",
 860         privs = {server=true},
 861         func = function(name, param)
 862                 local delay, reconnect, message
 863                 delay, param = param:match("^%s*(%S+)(.*)")
 864                 if param then
 865                         reconnect, param = param:match("^%s*(%S+)(.*)")
 866                 end
 867                 message = param and param:match("^%s*(.+)") or ""
 868                 delay = tonumber(delay) or 0
 869
 870                 if delay == 0 then
 871                         core.log("action", name .. " shuts down server")
 872                         core.chat_send_all("*** Server shutting down (operator request).")
 873                 end
 874                 core.request_shutdown(message:trim(), core.is_yes(reconnect), delay)
 875         end,
 876 })
 877
 878 core.register_chatcommand("ban", {
 879         params = "[<name> | <IP_address>]",
 880         description = "Ban player or show ban list",
 881         privs = {ban=true},
 882         func = function(name, param)
 883                 if param == "" then
 884                         local ban_list = core.get_ban_list()
 885                         if ban_list == "" then
 886                                 return true, "The ban list is empty."
 887                         else
 888                                 return true, "Ban list: " .. ban_list
 889                         end
 890                 end
 891                 if not core.get_player_by_name(param) then
 892                         return false, "No such player."
 893                 end
 894                 if not core.ban_player(param) then
 895                         return false, "Failed to ban player."
 896                 end
 897                 local desc = core.get_ban_description(param)
 898                 core.log("action", name .. " bans " .. desc .. ".")
 899                 return true, "Banned " .. desc .. "."
 900         end,
 901 })
 902
 903 core.register_chatcommand("unban", {
 904         params = "<name> | <IP_address>",
 905         description = "Remove player ban",
 906         privs = {ban=true},
 907         func = function(name, param)
 908                 if not core.unban_player_or_ip(param) then
 909                         return false, "Failed to unban player/IP."
 910                 end
 911                 core.log("action", name .. " unbans " .. param)
 912                 return true, "Unbanned " .. param
 913         end,
 914 })
 915
 916 core.register_chatcommand("kick", {
 917         params = "<name> [<reason>]",
 918         description = "Kick a player",
 919         privs = {kick=true},
 920         func = function(name, param)
 921                 local tokick, reason = param:match("([^ ]+) (.+)")
 922                 tokick = tokick or param
 923                 if not core.kick_player(tokick, reason) then
 924                         return false, "Failed to kick player " .. tokick
 925                 end
 926                 local log_reason = ""
 927                 if reason then
 928                         log_reason = " with reason \"" .. reason .. "\""
 929                 end
 930                 core.log("action", name .. " kicks " .. tokick .. log_reason)
 931                 return true, "Kicked " .. tokick
 932         end,
 933 })
 934
 935 core.register_chatcommand("clearobjects", {
 936         params = "[full | quick]",
 937         description = "Clear all objects in world",
 938         privs = {server=true},
 939         func = function(name, param)
 940                 local options = {}
 941                 if param == "" or param == "quick" then
 942                         options.mode = "quick"
 943                 elseif param == "full" then
 944                         options.mode = "full"
 945                 else
 946                         return false, "Invalid usage, see /help clearobjects."
 947                 end
 948
 949                 core.log("action", name .. " clears all objects ("
 950                                 .. options.mode .. " mode).")
 951                 core.chat_send_all("Clearing all objects.  This may take long."
 952                                 .. "  You may experience a timeout.  (by "
 953                                 .. name .. ")")
 954                 core.clear_objects(options)
 955                 core.log("action", "Object clearing done.")
 956                 core.chat_send_all("*** Cleared all objects.")
 957         end,
 958 })
 959
 960 core.register_chatcommand("msg", {
 961         params = "<name> <message>",
 962         description = "Send a private message",
 963         privs = {shout=true},
 964         func = function(name, param)
 965                 local sendto, message = param:match("^(%S+)%s(.+)$")
 966                 if not sendto then
 967                         return false, "Invalid usage, see /help msg."
 968                 end
 969                 if not core.get_player_by_name(sendto) then
 970                         return false, "The player " .. sendto
 971                                         .. " is not online."
 972                 end
 973                 core.log("action", "PM from " .. name .. " to " .. sendto
 974                                 .. ": " .. message)
 975                 core.chat_send_player(sendto, "PM from " .. name .. ": "
 976                                 .. message)
 977                 return true, "Message sent."
 978         end,
 979 })
 980
 981 core.register_chatcommand("last-login", {
 982         params = "[<name>]",
 983         description = "Get the last login time of a player or yourself",
 984         func = function(name, param)
 985                 if param == "" then
 986                         param = name
 987                 end
 988                 local pauth = core.get_auth_handler().get_auth(param)
 989                 if pauth and pauth.last_login then
 990                         -- Time in UTC, ISO 8601 format
 991                         return true, "Last login time was " ..
 992                                 os.date("!%Y-%m-%dT%H:%M:%SZ", pauth.last_login)
 993                 end
 994                 return false, "Last login time is unknown"
 995         end,
 996 })
 997
 998 core.register_chatcommand("clearinv", {
 999         params = "[<name>]",
1000         description = "Clear the inventory of yourself or another player",
1001         func = function(name, param)
1002                 local player
1003                 if param and param ~= "" and param ~= name then
1004                         if not core.check_player_privs(name, {server=true}) then
1005                                 return false, "You don't have permission"
1006                                                 .. " to clear another player's inventory (missing privilege: server)"
1007                         end
1008                         player = core.get_player_by_name(param)
1009                         core.chat_send_player(param, name.." cleared your inventory.")
1010                 else
1011                         player = core.get_player_by_name(name)
1012                 end
1013
1014                 if player then
1015                         player:get_inventory():set_list("main", {})
1016                         player:get_inventory():set_list("craft", {})
1017                         player:get_inventory():set_list("craftpreview", {})
1018                         core.log("action", name.." clears "..player:get_player_name().."'s inventory")
1019                         return true, "Cleared "..player:get_player_name().."'s inventory."
1020                 else
1021                         return false, "Player must be online to clear inventory!"
1022                 end
1023         end,
1024 })
1025
1026 local function handle_kill_command(killer, victim)
1027         if core.settings:get_bool("enable_damage") == false then
1028                 return false, "Players can't be killed, damage has been disabled."
1029         end
1030         local victimref = core.get_player_by_name(victim)
1031         if victimref == nil then
1032                 return false, string.format("Player %s is not online.", victim)
1033         elseif victimref:get_hp() <= 0 then
1034                 if killer == victim then
1035                         return false, "You are already dead."
1036                 else
1037                         return false, string.format("%s is already dead.", victim)
1038                 end
1039         end
1040         if not killer == victim then
1041                 core.log("action", string.format("%s killed %s", killer, victim))
1042         end
1043         -- Kill victim
1044         victimref:set_hp(0)
1045         return true, string.format("%s has been killed.", victim)
1046 end
1047
1048 core.register_chatcommand("kill", {
1049         params = "[<name>]",
1050         description = "Kill player or yourself",
1051         privs = {server=true},
1052         func = function(name, param)
1053                 return handle_kill_command(name, param == "" and name or param)
1054         end,
1055 })