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