【安全加密】防加速外挂：时间戳偏差的检测

---attack: 攻击触发，冷却间隔的服务器校验
local CD_ATTACK = 0.8   -- 攻击间隔下限 0.8 秒

function attack(self, Target, Hiter, MagicId)
    local now = os.clock()
    local last = self.lastAttackAt or 0
    local gap = now - last
    if gap < CD_ATTACK * 0.9 then
        -- 间隔不足：拒绝并计入偏差样本
        AntiCheat.sample(self, gap)
        return
    end
    self.lastAttackAt = now
    -- 正常的攻击结算继续
end

---偏差样本的累计与判定
function AntiCheat.sample(actor, gap)
    local s = AntiCheat.prof[actor:GetUserId()] or
        { n = 0, fast = 0 }
    s.n = s.n + 1
    if gap < CD_ATTACK * 0.5 then s.fast = s.fast + 1 end
    AntiCheat.prof[actor:GetUserId()] = s
    if s.n >= 100 and s.fast / s.n > 0.3 then
        Ban.apply(actor, "func", "加速嫌疑")
    end
end

---移动速度的偏差校验
setontimerex(80, 1)
function AntiCheat.moveCheck()
    for _, actor in pairs(Online.all()) do
        local d = Move.distPerSec(actor)
        local cap = actor:GetMoveSpeed() * 1.3
        if d > cap then
            actor.moveFast = (actor.moveFast or 0) + 1
            if actor.moveFast >= 5 then
                mapmove(actor, actor.mapId,
                    actor.serverX, actor.serverY, 0)
                AntiCheat.sample(actor, 0)
                actor.moveFast = 0
            end
        end
    end
end