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         core.chatcommands[cmd] = def
  14 end
  15
  16 if core.setting_getbool("mod_profiling") then
  17         local tracefct = profiling_print_log
  18         profiling_print_log = nil
  19         core.register_chatcommand("save_mod_profile",
  20                         {
  21                                 params      = "",
  22                                 description = "save mod profiling data to logfile " ..
  23                                                 "(depends on default loglevel)",
  24                                 func        = tracefct,
  25                                 privs       = { server=true }
  26                         })
  27 end
  28
  29 core.register_on_chat_message(function(name, message)
  30         local cmd, param = string.match(message, "^/([^ ]+) *(.*)")
  31         if not param then
  32                 param = ""
  33         end
  34         local cmd_def = core.chatcommands[cmd]
  35         if not cmd_def then
  36                 return false
  37         end
  38         local has_privs, missing_privs = core.check_player_privs(name, cmd_def.privs)
  39         if has_privs then
  40                 local success, message = cmd_def.func(name, param)
  41                 if message then
  42                         core.chat_send_player(name, message)
  43                 end
  44         else
  45                 core.chat_send_player(name, "You don't have permission"
  46                                 .. " to run this command (missing privileges: "
  47                                 .. table.concat(missing_privs, ", ") .. ")")
  48         end
  49         return true  -- Handled chat message
  50 end)
  51
  52 --
  53 -- Chat commands
  54 --
  55 core.register_chatcommand("me", {
  56         params = "<action>",
  57         description = "chat action (eg. /me orders a pizza)",
  58         privs = {shout=true},
  59         func = function(name, param)
  60                 core.chat_send_all("* " .. name .. " " .. param)
  61         end,
  62 })
  63
  64 core.register_chatcommand("help", {
  65         privs = {},
  66         params = "[all/privs/<cmd>]",
  67         description = "Get help for commands or list privileges",
  68         func = function(name, param)
  69                 local function format_help_line(cmd, def)
  70                         local msg = "/"..cmd
  71                         if def.params and def.params ~= "" then
  72                                 msg = msg .. " " .. def.params
  73                         end
  74                         if def.description and def.description ~= "" then
  75                                 msg = msg .. ": " .. def.description
  76                         end
  77                         return msg
  78                 end
  79                 if param == "" then
  80                         local msg = ""
  81                         local cmds = {}
  82                         for cmd, def in pairs(core.chatcommands) do
  83                                 if core.check_player_privs(name, def.privs) then
  84                                         table.insert(cmds, cmd)
  85                                 end
  86                         end
  87                         table.sort(cmds)
  88                         return true, "Available commands: " .. table.concat(cmds, " ") .. "\n"
  89                                         .. "Use '/help <cmd>' to get more information,"
  90                                         .. " or '/help all' to list everything."
  91                 elseif param == "all" then
  92                         local cmds = {}
  93                         for cmd, def in pairs(core.chatcommands) do
  94                                 if core.check_player_privs(name, def.privs) then
  95                                         table.insert(cmds, format_help_line(cmd, def))
  96                                 end
  97                         end
  98                         table.sort(cmds)
  99                         return true, "Available commands:\n"..table.concat(cmds, "\n")
 100                 elseif param == "privs" then
 101                         local privs = {}
 102                         for priv, def in pairs(core.registered_privileges) do
 103                                 table.insert(privs, priv .. ": " .. def.description)
 104                         end
 105                         table.sort(privs)
 106                         return true, "Available privileges:\n"..table.concat(privs, "\n")
 107                 else
 108                         local cmd = param
 109                         local def = core.chatcommands[cmd]
 110                         if not def then
 111                                 return false, "Command not available: "..cmd
 112                         else
 113                                 return true, format_help_line(cmd, def)
 114                         end
 115                 end
 116         end,
 117 })
 118
 119 core.register_chatcommand("privs", {
 120         params = "<name>",
 121         description = "print out privileges of player",
 122         func = function(name, param)
 123                 param = (param ~= "" and param or name)
 124                 return true, "Privileges of " .. param .. ": "
 125                         .. core.privs_to_string(
 126                                 core.get_player_privs(param), ' ')
 127         end,
 128 })
 129 core.register_chatcommand("grant", {
 130         params = "<name> <privilege>|all",
 131         description = "Give privilege to player",
 132         func = function(name, param)
 133                 if not core.check_player_privs(name, {privs=true}) and
 134                                 not core.check_player_privs(name, {basic_privs=true}) then
 135                         return false, "Your privileges are insufficient."
 136                 end
 137                 local grantname, grantprivstr = string.match(param, "([^ ]+) (.+)")
 138                 if not grantname or not grantprivstr then
 139                         return false, "Invalid parameters (see /help grant)"
 140                 elseif not core.auth_table[grantname] then
 141                         return false, "Player " .. grantname .. " does not exist."
 142                 end
 143                 local grantprivs = core.string_to_privs(grantprivstr)
 144                 if grantprivstr == "all" then
 145                         grantprivs = core.registered_privileges
 146                 end
 147                 local privs = core.get_player_privs(grantname)
 148                 local privs_unknown = ""
 149                 for priv, _ in pairs(grantprivs) do
 150                         if priv ~= "interact" and priv ~= "shout" and
 151                                         not core.check_player_privs(name, {privs=true}) then
 152                                 return false, "Your privileges are insufficient."
 153                         end
 154                         if not core.registered_privileges[priv] then
 155                                 privs_unknown = privs_unknown .. "Unknown privilege: " .. priv .. "\n"
 156                         end
 157                         privs[priv] = true
 158                 end
 159                 if privs_unknown ~= "" then
 160                         return false, privs_unknown
 161                 end
 162                 core.set_player_privs(grantname, privs)
 163                 core.log("action", name..' granted ('..core.privs_to_string(grantprivs, ', ')..') privileges to '..grantname)
 164                 if grantname ~= name then
 165                         core.chat_send_player(grantname, name
 166                                         .. " granted you privileges: "
 167                                         .. core.privs_to_string(grantprivs, ' '))
 168                 end
 169                 return true, "Privileges of " .. grantname .. ": "
 170                         .. core.privs_to_string(
 171                                 core.get_player_privs(grantname), ' ')
 172         end,
 173 })
 174 core.register_chatcommand("revoke", {
 175         params = "<name> <privilege>|all",
 176         description = "Remove privilege from player",
 177         privs = {},
 178         func = function(name, param)
 179                 if not core.check_player_privs(name, {privs=true}) and
 180                                 not core.check_player_privs(name, {basic_privs=true}) then
 181                         return false, "Your privileges are insufficient."
 182                 end
 183                 local revoke_name, revoke_priv_str = string.match(param, "([^ ]+) (.+)")
 184                 if not revoke_name or not revoke_priv_str then
 185                         return false, "Invalid parameters (see /help revoke)"
 186                 elseif not core.auth_table[revoke_name] then
 187                         return false, "Player " .. revoke_name .. " does not exist."
 188                 end
 189                 local revoke_privs = core.string_to_privs(revoke_priv_str)
 190                 local privs = core.get_player_privs(revoke_name)
 191                 for priv, _ in pairs(revoke_privs) do
 192                         if priv ~= "interact" and priv ~= "shout" and priv ~= "interact_extra" and
 193                                         not core.check_player_privs(name, {privs=true}) then
 194                                 return false, "Your privileges are insufficient."
 195                         end
 196                 end
 197                 if revoke_priv_str == "all" then
 198                         privs = {}
 199                 else
 200                         for priv, _ in pairs(revoke_privs) do
 201                                 privs[priv] = nil
 202                         end
 203                 end
 204                 core.set_player_privs(revoke_name, privs)
 205                 core.log("action", name..' revoked ('
 206                                 ..core.privs_to_string(revoke_privs, ', ')
 207                                 ..') privileges from '..revoke_name)
 208                 if revoke_name ~= name then
 209                         core.chat_send_player(revoke_name, name
 210                                         .. " revoked privileges from you: "
 211                                         .. core.privs_to_string(revoke_privs, ' '))
 212                 end
 213                 return true, "Privileges of " .. revoke_name .. ": "
 214                         .. core.privs_to_string(
 215                                 core.get_player_privs(revoke_name), ' ')
 216         end,
 217 })
 218
 219 core.register_chatcommand("setpassword", {
 220         params = "<name> <password>",
 221         description = "set given password",
 222         privs = {password=true},
 223         func = function(name, param)
 224                 local toname, raw_password = string.match(param, "^([^ ]+) +(.+)$")
 225                 if not toname then
 226                         toname = param:match("^([^ ]+) *$")
 227                         raw_password = nil
 228                 end
 229                 if not toname then
 230                         return false, "Name field required"
 231                 end
 232                 local actstr = "?"
 233                 if not raw_password then
 234                         core.set_player_password(toname, "")
 235                         actstr = "cleared"
 236                 else
 237                         core.set_player_password(toname,
 238                                         core.get_password_hash(toname,
 239                                                         raw_password))
 240                         actstr = "set"
 241                 end
 242                 if toname ~= name then
 243                         core.chat_send_player(toname, "Your password was "
 244                                         .. actstr .. " by " .. name)
 245                 end
 246                 return true, "Password of player \"" .. toname .. "\" " .. actstr
 247         end,
 248 })
 249
 250 core.register_chatcommand("clearpassword", {
 251         params = "<name>",
 252         description = "set empty password",
 253         privs = {password=true},
 254         func = function(name, param)
 255                 toname = param
 256                 if toname == "" then
 257                         return false, "Name field required"
 258                 end
 259                 core.set_player_password(toname, '')
 260                 return true, "Password of player \"" .. toname .. "\" cleared"
 261         end,
 262 })
 263
 264 core.register_chatcommand("auth_reload", {
 265         params = "",
 266         description = "reload authentication data",
 267         privs = {server=true},
 268         func = function(name, param)
 269                 local done = core.auth_reload()
 270                 return done, (done and "Done." or "Failed.")
 271         end,
 272 })
 273
 274 core.register_chatcommand("teleport", {
 275         params = "<X>,<Y>,<Z> | <to_name> | <name> <X>,<Y>,<Z> | <name> <to_name>",
 276         description = "teleport to given position",
 277         privs = {teleport=true},
 278         func = function(name, param)
 279                 -- Returns (pos, true) if found, otherwise (pos, false)
 280                 local function find_free_position_near(pos)
 281                         local tries = {
 282                                 {x=1,y=0,z=0},
 283                                 {x=-1,y=0,z=0},
 284                                 {x=0,y=0,z=1},
 285                                 {x=0,y=0,z=-1},
 286                         }
 287                         for _, d in ipairs(tries) do
 288                                 local p = {x = pos.x+d.x, y = pos.y+d.y, z = pos.z+d.z}
 289                                 local n = core.get_node_or_nil(p)
 290                                 if n and n.name then
 291                                         local def = core.registered_nodes[n.name]
 292                                         if def and not def.walkable then
 293                                                 return p, true
 294                                         end
 295                                 end
 296                         end
 297                         return pos, false
 298                 end
 299
 300                 local teleportee = nil
 301                 local p = {}
 302                 p.x, p.y, p.z = string.match(param, "^([%d.-]+)[, ] *([%d.-]+)[, ] *([%d.-]+)$")
 303                 p.x = tonumber(p.x)
 304                 p.y = tonumber(p.y)
 305                 p.z = tonumber(p.z)
 306                 teleportee = core.get_player_by_name(name)
 307                 if teleportee and p.x and p.y and p.z then
 308                         teleportee:setpos(p)
 309                         return true, "Teleporting to "..core.pos_to_string(p)
 310                 end
 311
 312                 local teleportee = nil
 313                 local p = nil
 314                 local target_name = nil
 315                 target_name = param:match("^([^ ]+)$")
 316                 teleportee = core.get_player_by_name(name)
 317                 if target_name then
 318                         local target = core.get_player_by_name(target_name)
 319                         if target then
 320                                 p = target:getpos()
 321                         end
 322                 end
 323                 if teleportee and p then
 324                         p = find_free_position_near(p)
 325                         teleportee:setpos(p)
 326                         return true, "Teleporting to " .. target_name
 327                                         .. " at "..core.pos_to_string(p)
 328                 end
 329
 330                 if not core.check_player_privs(name, {bring=true}) then
 331                         return false, "You don't have permission to teleport other players (missing bring privilege)"
 332                 end
 333
 334                 local teleportee = nil
 335                 local p = {}
 336                 local teleportee_name = nil
 337                 teleportee_name, p.x, p.y, p.z = param:match(
 338                                 "^([^ ]+) +([%d.-]+)[, ] *([%d.-]+)[, ] *([%d.-]+)$")
 339                 p.x, p.y, p.z = tonumber(p.x), tonumber(p.y), tonumber(p.z)
 340                 if teleportee_name then
 341                         teleportee = core.get_player_by_name(teleportee_name)
 342                 end
 343                 if teleportee and p.x and p.y and p.z then
 344                         teleportee:setpos(p)
 345                         return true, "Teleporting " .. teleportee_name
 346                                         .. " to " .. core.pos_to_string(p)
 347                 end
 348
 349                 local teleportee = nil
 350                 local p = nil
 351                 local teleportee_name = nil
 352                 local target_name = nil
 353                 teleportee_name, target_name = string.match(param, "^([^ ]+) +([^ ]+)$")
 354                 if teleportee_name then
 355                         teleportee = core.get_player_by_name(teleportee_name)
 356                 end
 357                 if target_name then
 358                         local target = core.get_player_by_name(target_name)
 359                         if target then
 360                                 p = target:getpos()
 361                         end
 362                 end
 363                 if teleportee and p then
 364                         p = find_free_position_near(p)
 365                         teleportee:setpos(p)
 366                         return true, "Teleporting " .. teleportee_name
 367                                         .. " to " .. target_name
 368                                         .. " at " .. core.pos_to_string(p)
 369                 end
 370
 371                 return false, 'Invalid parameters ("' .. param
 372                                 .. '") or player not found (see /help teleport)'
 373         end,
 374 })
 375
 376 core.register_chatcommand("set", {
 377         params = "[-n] <name> <value> | <name>",
 378         description = "set or read server configuration setting",
 379         privs = {server=true},
 380         func = function(name, param)
 381                 local arg, setname, setvalue = string.match(param, "(-[n]) ([^ ]+) (.+)")
 382                 if arg and arg == "-n" and setname and setvalue then
 383                         core.setting_set(setname, setvalue)
 384                         return true, setname .. " = " .. setvalue
 385                 end
 386                 local setname, setvalue = string.match(param, "([^ ]+) (.+)")
 387                 if setname and setvalue then
 388                         if not core.setting_get(setname) then
 389                                 return false, "Failed. Use '/set -n <name> <value>' to create a new setting."
 390                         end
 391                         core.setting_set(setname, setvalue)
 392                         return true, setname .. " = " .. setvalue
 393                 end
 394                 local setname = string.match(param, "([^ ]+)")
 395                 if setname then
 396                         local setvalue = core.setting_get(setname)
 397                         if not setvalue then
 398                                 setvalue = "<not set>"
 399                         end
 400                         return true, setname .. " = " .. setvalue
 401                 end
 402                 return false, "Invalid parameters (see /help set)."
 403         end,
 404 })
 405
 406 core.register_chatcommand("mods", {
 407         params = "",
 408         description = "List mods installed on the server",
 409         privs = {},
 410         func = function(name, param)
 411                 return true, table.concat(core.get_modnames(), ", ")
 412         end,
 413 })
 414
 415 local function handle_give_command(cmd, giver, receiver, stackstring)
 416         core.log("action", giver .. " invoked " .. cmd
 417                         .. ', stackstring="' .. stackstring .. '"')
 418         local itemstack = ItemStack(stackstring)
 419         if itemstack:is_empty() then
 420                 return false, "Cannot give an empty item"
 421         elseif not itemstack:is_known() then
 422                 return false, "Cannot give an unknown item"
 423         end
 424         local receiverref = core.get_player_by_name(receiver)
 425         if receiverref == nil then
 426                 return false, receiver .. " is not a known player"
 427         end
 428         local leftover = receiverref:get_inventory():add_item("main", itemstack)
 429         if leftover:is_empty() then
 430                 partiality = ""
 431         elseif leftover:get_count() == itemstack:get_count() then
 432                 partiality = "could not be "
 433         else
 434                 partiality = "partially "
 435         end
 436         -- The actual item stack string may be different from what the "giver"
 437         -- entered (e.g. big numbers are always interpreted as 2^16-1).
 438         stackstring = itemstack:to_string()
 439         if giver == receiver then
 440                 return true, ("%q %sadded to inventory.")
 441                                 :format(stackstring, partiality)
 442         else
 443                 core.chat_send_player(receiver, ("%q %sadded to inventory.")
 444                                 :format(stackstring, partiality))
 445                 return true, ("%q %sadded to %s's inventory.")
 446                                 :format(stackstring, partiality, receiver)
 447         end
 448 end
 449
 450 core.register_chatcommand("give", {
 451         params = "<name> <ItemString>",
 452         description = "give item to player",
 453         privs = {give=true},
 454         func = function(name, param)
 455                 local toname, itemstring = string.match(param, "^([^ ]+) +(.+)$")
 456                 if not toname or not itemstring then
 457                         return false, "Name and ItemString required"
 458                 end
 459                 return handle_give_command("/give", name, toname, itemstring)
 460         end,
 461 })
 462
 463 core.register_chatcommand("giveme", {
 464         params = "<ItemString>",
 465         description = "give item to yourself",
 466         privs = {give=true},
 467         func = function(name, param)
 468                 local itemstring = string.match(param, "(.+)$")
 469                 if not itemstring then
 470                         return false, "ItemString required"
 471                 end
 472                 return handle_give_command("/giveme", name, name, itemstring)
 473         end,
 474 })
 475
 476 core.register_chatcommand("spawnentity", {
 477         params = "<EntityName>",
 478         description = "Spawn entity at your position",
 479         privs = {give=true, interact=true},
 480         func = function(name, param)
 481                 local entityname = string.match(param, "(.+)$")
 482                 if not entityname then
 483                         return false, "EntityName required"
 484                 end
 485                 core.log("action", ("/spawnentity invoked, entityname=%q")
 486                                 :format(entityname))
 487                 local player = core.get_player_by_name(name)
 488                 if player == nil then
 489                         core.log("error", "Unable to spawn entity, player is nil")
 490                         return false, "Unable to spawn entity, player is nil"
 491                 end
 492                 local p = player:getpos()
 493                 p.y = p.y + 1
 494                 core.add_entity(p, entityname)
 495                 return true, ("%q spawned."):format(entityname)
 496         end,
 497 })
 498
 499 core.register_chatcommand("pulverize", {
 500         params = "",
 501         description = "Destroy item in hand",
 502         func = function(name, param)
 503                 local player = core.get_player_by_name(name)
 504                 if not player then
 505                         core.log("error", "Unable to pulverize, no player.")
 506                         return false, "Unable to pulverize, no player."
 507                 end
 508                 if player:get_wielded_item():is_empty() then
 509                         return false, "Unable to pulverize, no item in hand."
 510                 end
 511                 player:set_wielded_item(nil)
 512                 return true, "An item was pulverized."
 513         end,
 514 })
 515
 516 -- Key = player name
 517 core.rollback_punch_callbacks = {}
 518
 519 core.register_on_punchnode(function(pos, node, puncher)
 520         local name = puncher:get_player_name()
 521         if core.rollback_punch_callbacks[name] then
 522                 core.rollback_punch_callbacks[name](pos, node, puncher)
 523                 core.rollback_punch_callbacks[name] = nil
 524         end
 525 end)
 526
 527 core.register_chatcommand("rollback_check", {
 528         params = "[<range>] [<seconds>] [limit]",
 529         description = "Check who has last touched a node or near it,"
 530                         .. " max. <seconds> ago (default range=0,"
 531                         .. " seconds=86400=24h, limit=5)",
 532         privs = {rollback=true},
 533         func = function(name, param)
 534                 local range, seconds, limit =
 535                         param:match("(%d+) *(%d*) *(%d*)")
 536                 range = tonumber(range) or 0
 537                 seconds = tonumber(seconds) or 86400
 538                 limit = tonumber(limit) or 5
 539                 if limit > 100 then
 540                         return false, "That limit is too high!"
 541                 end
 542
 543                 core.rollback_punch_callbacks[name] = function(pos, node, puncher)
 544                         local name = puncher:get_player_name()
 545                         core.chat_send_player(name, "Checking " .. core.pos_to_string(pos) .. "...")
 546                         local actions = core.rollback_get_node_actions(pos, range, seconds, limit)
 547                         local num_actions = #actions
 548                         if num_actions == 0 then
 549                                 core.chat_send_player(name, "Nobody has touched"
 550                                                 .. " the specified location in "
 551                                                 .. seconds .. " seconds")
 552                                 return
 553                         end
 554                         local time = os.time()
 555                         for i = num_actions, 1, -1 do
 556                                 local action = actions[i]
 557                                 core.chat_send_player(name,
 558                                         ("%s %s %s -> %s %d seconds ago.")
 559                                                 :format(
 560                                                         core.pos_to_string(action.pos),
 561                                                         action.actor,
 562                                                         action.oldnode.name,
 563                                                         action.newnode.name,
 564                                                         time - action.time))
 565                         end
 566                 end
 567
 568                 return true, "Punch a node (range=" .. range .. ", seconds="
 569                                 .. seconds .. "s, limit=" .. limit .. ")"
 570         end,
 571 })
 572
 573 core.register_chatcommand("rollback", {
 574         params = "<player name> [<seconds>] | :<actor> [<seconds>]",
 575         description = "revert actions of a player; default for <seconds> is 60",
 576         privs = {rollback=true},
 577         func = function(name, param)
 578                 local target_name, seconds = string.match(param, ":([^ ]+) *(%d*)")
 579                 if not target_name then
 580                         local player_name = nil
 581                         player_name, seconds = string.match(param, "([^ ]+) *(%d*)")
 582                         if not player_name then
 583                                 return false, "Invalid parameters. See /help rollback"
 584                                                 .. " and /help rollback_check."
 585                         end
 586                         target_name = "player:"..player_name
 587                 end
 588                 seconds = tonumber(seconds) or 60
 589                 core.chat_send_player(name, "Reverting actions of "
 590                                 .. target_name .. " since "
 591                                 .. seconds .. " seconds.")
 592                 local success, log = core.rollback_revert_actions_by(
 593                                 target_name, seconds)
 594                 local response = ""
 595                 if #log > 100 then
 596                         response = "(log is too long to show)\n"
 597                 else
 598                         for _, line in pairs(log) do
 599                                 response = response .. line .. "\n"
 600                         end
 601                 end
 602                 response = response .. "Reverting actions "
 603                                 .. (success and "succeeded." or "FAILED.")
 604                 return success, response
 605         end,
 606 })
 607
 608 core.register_chatcommand("status", {
 609         description = "Print server status",
 610         func = function(name, param)
 611                 return true, core.get_server_status()
 612         end,
 613 })
 614
 615 core.register_chatcommand("time", {
 616         params = "<0...24000>",
 617         description = "set time of day",
 618         privs = {settime=true},
 619         func = function(name, param)
 620                 if param == "" then
 621                         return false, "Missing time."
 622                 end
 623                 local newtime = tonumber(param)
 624                 if newtime == nil then
 625                         return false, "Invalid time."
 626                 end
 627                 core.set_timeofday((newtime % 24000) / 24000)
 628                 core.log("action", name .. " sets time " .. newtime)
 629                 return true, "Time of day changed."
 630         end,
 631 })
 632
 633 core.register_chatcommand("shutdown", {
 634         description = "shutdown server",
 635         privs = {server=true},
 636         func = function(name, param)
 637                 core.log("action", name .. " shuts down server")
 638                 core.request_shutdown()
 639                 core.chat_send_all("*** Server shutting down (operator request).")
 640         end,
 641 })
 642
 643 core.register_chatcommand("ban", {
 644         params = "<name>",
 645         description = "Ban IP of player",
 646         privs = {ban=true},
 647         func = function(name, param)
 648                 if param == "" then
 649                         return true, "Ban list: " .. core.get_ban_list()
 650                 end
 651                 if not core.get_player_by_name(param) then
 652                         return false, "No such player."
 653                 end
 654                 if not core.ban_player(param) then
 655                         return false, "Failed to ban player."
 656                 end
 657                 local desc = core.get_ban_description(param)
 658                 core.log("action", name .. " bans " .. desc .. ".")
 659                 return true, "Banned " .. desc .. "."
 660         end,
 661 })
 662
 663 core.register_chatcommand("unban", {
 664         params = "<name/ip>",
 665         description = "remove IP ban",
 666         privs = {ban=true},
 667         func = function(name, param)
 668                 if not core.unban_player_or_ip(param) then
 669                         return false, "Failed to unban player/IP."
 670                 end
 671                 core.log("action", name .. " unbans " .. param)
 672                 return true, "Unbanned " .. param
 673         end,
 674 })
 675
 676 core.register_chatcommand("kick", {
 677         params = "<name> [reason]",
 678         description = "kick a player",
 679         privs = {kick=true},
 680         func = function(name, param)
 681                 local tokick, reason = param:match("([^ ]+) (.+)")
 682                 tokick = tokick or param
 683                 if not core.kick_player(tokick, reason) then
 684                         return false, "Failed to kick player " .. tokick
 685                 end
 686                 core.log("action", name .. " kicked " .. tokick)
 687                 return true, "Kicked " .. tokick
 688         end,
 689 })
 690
 691 core.register_chatcommand("clearobjects", {
 692         description = "clear all objects in world",
 693         privs = {server=true},
 694         func = function(name, param)
 695                 core.log("action", name .. " clears all objects.")
 696                 core.chat_send_all("Clearing all objects.  This may take long."
 697                                 .. "  You may experience a timeout.  (by "
 698                                 .. name .. ")")
 699                 core.clear_objects()
 700                 core.log("action", "Object clearing done.")
 701                 core.chat_send_all("*** Cleared all objects.")
 702         end,
 703 })
 704
 705 core.register_chatcommand("msg", {
 706         params = "<name> <message>",
 707         description = "Send a private message",
 708         privs = {shout=true},
 709         func = function(name, param)
 710                 local sendto, message = param:match("^(%S+)%s(.+)$")
 711                 if not sendto then
 712                         return false, "Invalid usage, see /help msg."
 713                 end
 714                 if not core.get_player_by_name(sendto) then
 715                         return false, "The player " .. sendto
 716                                         .. " is not online."
 717                 end
 718                 core.log("action", "PM from " .. name .. " to " .. sendto
 719                                 .. ": " .. message)
 720                 core.chat_send_player(sendto, "PM from " .. name .. ": "
 721                                 .. message)
 722                 return true, "Message sent."
 723         end,
 724 })
 725
 726 core.register_chatcommand("last-login", {
 727         params = "[name]",
 728         description = "Get the last login time of a player",
 729         func = function(name, param)
 730                 if param == "" then
 731                         param = name
 732                 end
 733                 local pauth = core.get_auth_handler().get_auth(param)
 734                 if pauth and pauth.last_login then
 735                         -- Time in UTC, ISO 8601 format
 736                         return true, "Last login time was " ..
 737                                 os.date("!%Y-%m-%dT%H:%M:%SZ", pauth.last_login)
 738                 end
 739                 return false, "Last login time is unknown"
 740         end,
 741 })
 742