qb-core/server/events.lua

-- Event Handler

AddEventHandler('chatMessage', function(source, _, message)
    if string.sub(message, 1, 1) == '/' then
        CancelEvent()
        return
    end
end)

AddEventHandler('playerDropped', function()
    local src = source
    if not QBCore.Players[src] then return end
    local Player = QBCore.Players[src]
    TriggerEvent('qb-log:server:CreateLog', 'joinleave', 'Dropped', 'red', '**' .. GetPlayerName(src) .. '** (' .. Player.PlayerData.license .. ') left..')
    Player.Functions.Save()
    QBCore.Player_Buckets[Player.PlayerData.license] = nil
    QBCore.Players[src] = nil
end)

-- Player Connecting

local function onPlayerConnecting(name, setKickReason, deferrals)
    local src = source
    local license
    local identifiers = GetPlayerIdentifiers(src)
    deferrals.defer()

    -- Mandatory wait
    Wait(0)

    if QBCore.Config.Server.Closed then
        if not IsPlayerAceAllowed(src, 'qbadmin.join') then
            deferrals.done(QBCore.Config.Server.ClosedReason)
        end
    end

    deferrals.update(string.format(Lang:t('info.checking_ban'), name))

    for _, v in pairs(identifiers) do
        if string.find(v, 'license') then
            license = v
            break
        end
    end

    -- Mandatory wait
    Wait(2500)

    deferrals.update(string.format(Lang:t('info.checking_whitelisted'), name))

    local isBanned, Reason = QBCore.Functions.IsPlayerBanned(src)
    local isLicenseAlreadyInUse = QBCore.Functions.IsLicenseInUse(license)
    local isWhitelist, whitelisted = QBCore.Config.Server.Whitelist, QBCore.Functions.IsWhitelisted(src)

    Wait(2500)

    deferrals.update(Lang:t('info.join_server'), name))

    if not license then
      deferrals.done(Lang:t('error.no_valid_license'))    
    elseif isBanned then
        deferrals.done(Reason)
    elseif isLicenseAlreadyInUse and QBCore.Config.Server.CheckDuplicateLicense then
        deferrals.done(Lang:t('error.duplicate_license'))
    elseif isWhitelist and not whitelisted then
      deferrals.done(Lang:t('error.not_whitelisted'))    
    else
        deferrals.done()
        if QBCore.Config.Server.UseConnectQueue then
            Wait(1000)
            TriggerEvent('connectqueue:playerConnect', name, setKickReason, deferrals)
        end
    end
    -- Add any additional defferals you may need!
end

AddEventHandler('playerConnecting', onPlayerConnecting)

-- Open & Close Server (prevents players from joining)

RegisterNetEvent('QBCore:Server:CloseServer', function(reason)
    local src = source
    if QBCore.Functions.HasPermission(src, 'admin') then
        reason = reason or 'No reason specified'
        QBCore.Config.Server.Closed = true
        QBCore.Config.Server.ClosedReason = reason
        for k in pairs(QBCore.Players) do
            if not QBCore.Functions.HasPermission(k, QBCore.Config.Server.WhitelistPermission) then
                QBCore.Functions.Kick(k, reason, nil, nil)
            end
        end
    else
        QBCore.Functions.Kick(src, 'You don\'t have permissions for this..', nil, nil)
    end
end)

RegisterNetEvent('QBCore:Server:OpenServer', function()
    local src = source
    if QBCore.Functions.HasPermission(src, 'admin') then
        QBCore.Config.Server.Closed = false
    else
        QBCore.Functions.Kick(src, 'You don\'t have permissions for this..', nil, nil)
    end
end)

-- Callbacks

RegisterNetEvent('QBCore:Server:TriggerCallback', function(name, ...)
    local src = source
    QBCore.Functions.TriggerCallback(name, src, function(...)
        TriggerClientEvent('QBCore:Client:TriggerCallback', src, name, ...)
    end, ...)
end)

-- Player

RegisterNetEvent('QBCore:UpdatePlayer', function()
    local src = source
    local Player = QBCore.Functions.GetPlayer(src)
    if not Player then return end
    local newHunger = Player.PlayerData.metadata['hunger'] - QBCore.Config.Player.HungerRate
    local newThirst = Player.PlayerData.metadata['thirst'] - QBCore.Config.Player.ThirstRate
    if newHunger <= 0 then
        newHunger = 0
    end
    if newThirst <= 0 then
        newThirst = 0
    end
    Player.Functions.SetMetaData('thirst', newThirst)
    Player.Functions.SetMetaData('hunger', newHunger)
    TriggerClientEvent('hud:client:UpdateNeeds', src, newHunger, newThirst)
    Player.Functions.Save()
end)

RegisterNetEvent('QBCore:Server:SetMetaData', function(meta, data)
    local src = source
    local Player = QBCore.Functions.GetPlayer(src)
    if meta == 'hunger' or meta == 'thirst' then
        if data > 100 then
            data = 100
        end
    end
    if Player then
        Player.Functions.SetMetaData(meta, data)
    end
    TriggerClientEvent('hud:client:UpdateNeeds', src, Player.PlayerData.metadata['hunger'], Player.PlayerData.metadata['thirst'])
end)

RegisterNetEvent('QBCore:ToggleDuty', function()
    local src = source
    local Player = QBCore.Functions.GetPlayer(src)
    if not Player then return end
    if Player.PlayerData.job.onduty then
        Player.Functions.SetJobDuty(false)
        TriggerClientEvent('QBCore:Notify', src, Lang:t('info.off_duty'))
    else
        Player.Functions.SetJobDuty(true)
        TriggerClientEvent('QBCore:Notify', src, Lang:t('info.on_duty'))
    end
    TriggerClientEvent('QBCore:Client:SetDuty', src, Player.PlayerData.job.onduty)
end)

-- Items

RegisterNetEvent('QBCore:Server:UseItem', function(item)
    local src = source
    if not item or item.amount <= 0 or not QBCore.Functions.CanUseItem(item.name) then return end
    QBCore.Functions.UseItem(src, item)
end)

RegisterNetEvent('QBCore:Server:RemoveItem', function(itemName, amount, slot)
    local src = source
    local Player = QBCore.Functions.GetPlayer(src)
    if not Player then return end
    Player.Functions.RemoveItem(itemName, amount, slot)
end)

RegisterNetEvent('QBCore:Server:AddItem', function(itemName, amount, slot, info)
    local src = source
    local Player = QBCore.Functions.GetPlayer(src)
    if not Player then return end
    Player.Functions.AddItem(itemName, amount, slot, info)
end)

-- Non-Chat Command Calling (ex: qb-adminmenu)

RegisterNetEvent('QBCore:CallCommand', function(command, args)
    local src = source
    if not QBCore.Commands.List[command] then return end
    local Player = QBCore.Functions.GetPlayer(src)
    if not Player then return end
    local hasPerm = QBCore.Functions.HasPermission(src, "command."..QBCore.Commands.List[command].name)
    if hasPerm then
        if QBCore.Commands.List[command].argsrequired and #QBCore.Commands.List[command].arguments ~= 0 and not args[#QBCore.Commands.List[command].arguments] then
            TriggerClientEvent('QBCore:Notify', src, Lang:t('error.missing_args2'), 'error')
        else
            QBCore.Commands.List[command].callback(src, args)
        end
    else
        TriggerClientEvent('QBCore:Notify', src, Lang:t('error.no_access'), 'error')
    end
end)

-- Has Item Callback (can also use client function - QBCore.Functions.HasItem(item))

QBCore.Functions.CreateCallback('QBCore:HasItem', function(source, cb, items, amount)
    local retval = false
    local Player = QBCore.Functions.GetPlayer(source)
    if not Player then return cb(false) end
    if type(items) == 'table' then
        local count = 0
        local finalcount = 0
        for k, v in pairs(items) do
            if type(k) == 'string' then
                finalcount = 0
                for i, _ in pairs(items) do finalcount += 1 end
                local item = Player.Functions.GetItemByName(k)
                if item then
                    if item.amount >= v then
                        count += 1
                        if count == finalcount then
                            retval = true
                        end
                    end
                end
            else
                finalcount = #items
                local item = Player.Functions.GetItemByName(v)
                if item then
                    if amount then
                        if item.amount >= amount then
                            count += 1
                            if count == finalcount then
                                retval = true
                            end
                        end
                    else
                        count += 1
                        if count == finalcount then
                            retval = true
                        end
                    end
                end
            end
        end
    else
        local item = Player.Functions.GetItemByName(items)
        if not item then return cb(false) end
        if amount then
            if item.amount >= amount then
                retval = true
            end
        else
            retval = true
        end
    end
    cb(retval)
end)