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