builtin/game/chatcommands.lua

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