OnPlayerCommand: Difference between revisions

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__NOTOC__
__NOTOC__
{{Server event}}
{{Server event}}
This event is triggered when a player chats inside the chat box.
This event is triggered when a player issues a command.
 
{{Note|This event triggers regardless of whether the command exists in a script or is hardcoded. Also, typing anything in chat will execute the internal command "say", so this event will be triggered on every chat message as well. Therefore you should avoid excessive use of this function on busy servers, out of performance considerations.}}
'''''Note:''' This event triggers regardless of whether the command exists or not. Also, typing anything in chat will execute command "say", so this event will be triggered on every chat message as well.


==Parameters==
==Parameters==
Line 11: Line 10:


==Source==
==Source==
The [[event system#Event source|source]] of this event is the [[player]] who tried to execute a command
The [[event system#Event source|source]] of this event is the [[player]] who tried to execute a command.


==Cancel effect==
==Result of cancelling this event==
The command will not be executed
The command will not be executed. (Only server-side commands can be canceled.)


==Example==  
==Example==  
This example prevents players executing more than 5 commands a second, recommended for all servers
<section name="Server" class="server" show="true">
This example implements an anti-flood protection timer for commands.
'''Be sure to give the resource a function.kickPlayer right.
Also, note, that if the server freezes for a frame and a player executes a command 2x he/she'll get kicked, because those 2 commands will be processed after each other, with very little delay'''
<syntaxhighlight lang="lua">
<syntaxhighlight lang="lua">
local commandSpam = {}
local CMD_INTERVAL        = 200 --// The interval that needs to pass before the player can execute another cmd
local KICK_AFTER_INTERVAL = 50  --// Kick the player if they execute more than 20 cmds/sec
 
local executions = setmetatable({}, { --// Metatable for non-existing indexes
    __index = function(t, player)
        return getTickCount()-CMD_INTERVAL
    end
})
 
addEventHandler("onPlayerCommand", root,
    function()
        if (executions[source]-getTickCount()<=CMD_INTERVAL) then
            if (executions[source]-getTickCount()<=KICK_AFTER_INTERVAL) then
                kickPlayer(source, "Anti-Flood", "Don't flood")
            end
            cancelEvent()
        end
        executions[source] = getTickCount()
    end
)
</syntaxhighlight>


function preventCommandSpam()
This example disables the hardcoded command 'whois'
if (not commandSpam[source]) then
<syntaxhighlight lang="lua">
commandSpam[source] = 1
addEventHandler("onPlayerCommand",root,
-- New person so add to table
    function(command)
elseif (commandSpam[source] == 5) then
if (command == "whois") then
cancelEvent()
    cancelEvent()
outputChatBox("Please refrain from command spamming!", source, 255, 0, 0)
-- This person is command spamming!
else
commandSpam[source] = commandSpam[source] + 1
-- Add one to the table
end
end
end
end)
addEventHandler("onPlayerCommand", root, preventCommandSpam)
</syntaxhighlight>
setTimer(function() commandSpam = {} end, 1000, 0) -- Clear the table every second
</section>
 
 
<section name="Server" class="server" show="true">
Time limit specific commands.
<syntaxhighlight lang="lua">
local LIMITED_COMMANDS = {
    -- ["COMMAND_NAME"] = TIME_LIMIT_IN_SEC
    ["something"] = 5,  -- Can use this command only once in every 5 sec
    ["spam"]      = 10, -- Can use this command only once in every 10 sec
}
 
local EXEC = {}
 
addEventHandler("onPlayerCommand", root, function(cmd)
    local limit_sec = LIMITED_COMMANDS[cmd]
    if not limit_sec then return end
 
    local tick = getTickCount()
 
    if not EXEC[source]      then EXEC[source] = {}     end
    if not EXEC[source][cmd] then EXEC[source][cmd] = 0 end
 
    if EXEC[source][cmd] + (limit_sec * 1000) > tick then
        cancelEvent()
        return outputChatBox("#FF0000[ANTISPAM]#FFFFFF You can use this command once, in every "..limit_sec.." sec.", source, 255, 255, 255, true)
    end
    EXEC[source][cmd] = tick
end)
 
addEventHandler("onPlayerQuit", root, function()
    EXEC[source] = nil
end)
</syntaxhighlight>
</syntaxhighlight>
</section>


{{See also/Server event|Player events}}
{{See also/Server event|Player events}}

Latest revision as of 15:27, 31 August 2020

This event is triggered when a player issues a command.

[[{{{image}}}|link=|]] Note: This event triggers regardless of whether the command exists in a script or is hardcoded. Also, typing anything in chat will execute the internal command "say", so this event will be triggered on every chat message as well. Therefore you should avoid excessive use of this function on busy servers, out of performance considerations.

Parameters

string command

Source

The source of this event is the player who tried to execute a command.

Result of cancelling this event

The command will not be executed. (Only server-side commands can be canceled.)

Example

Click to collapse [-]
Server

This example implements an anti-flood protection timer for commands. Be sure to give the resource a function.kickPlayer right. Also, note, that if the server freezes for a frame and a player executes a command 2x he/she'll get kicked, because those 2 commands will be processed after each other, with very little delay 

local CMD_INTERVAL        = 200 --// The interval that needs to pass before the player can execute another cmd
local KICK_AFTER_INTERVAL = 50  --// Kick the player if they execute more than 20 cmds/sec

local executions = setmetatable({}, { --// Metatable for non-existing indexes
    __index = function(t, player)
        return getTickCount()-CMD_INTERVAL
    end
})

addEventHandler("onPlayerCommand", root,
    function()
        if (executions[source]-getTickCount()<=CMD_INTERVAL) then
            if (executions[source]-getTickCount()<=KICK_AFTER_INTERVAL) then 
                kickPlayer(source, "Anti-Flood", "Don't flood")
            end 
            cancelEvent()
        end
        executions[source] = getTickCount()
    end
)

This example disables the hardcoded command 'whois' 

addEventHandler("onPlayerCommand",root,
    function(command)
	if (command == "whois") then
	    cancelEvent()
	end
end)


Click to collapse [-]
Server

Time limit specific commands. 

local LIMITED_COMMANDS = {
    -- ["COMMAND_NAME"] = TIME_LIMIT_IN_SEC
    ["something"] = 5,  -- Can use this command only once in every 5 sec
    ["spam"]      = 10, -- Can use this command only once in every 10 sec
}

local EXEC = {}

addEventHandler("onPlayerCommand", root, function(cmd)
    local limit_sec = LIMITED_COMMANDS[cmd]
    if not limit_sec then return end

    local tick = getTickCount()

    if not EXEC[source]      then EXEC[source] = {}     end
    if not EXEC[source][cmd] then EXEC[source][cmd] = 0 end

    if EXEC[source][cmd] + (limit_sec * 1000) > tick then
        cancelEvent()
        return outputChatBox("#FF0000[ANTISPAM]#FFFFFF You can use this command once, in every "..limit_sec.." sec.", source, 255, 255, 255, true)
    end
    EXEC[source][cmd] = tick
end)

addEventHandler("onPlayerQuit", root, function()
    EXEC[source] = nil
end)

See Also

Player events


Event functions


Retrieved from "https://wiki.multitheftauto.com/wiki/OnPlayerCommand?oldid=67351"