【安全加密】请求防重放：时间窗、序号与nonce的三重时序校验

local lastSeq = {}
local function verifyOrder(actor, seq, ts)
    local player = class(actor)
    local name = player:GetName()
    local now = os.time()
    if math.abs(now - ts) > 30 then
        sendmsg(actor, 0, "请求已过期，请刷新后重试")
        return false
    end
    if lastSeq[name] ~= nil and seq <= lastSeq[name] then
        return false
    end
    lastSeq[name] = seq
    return true
end

local nonceTab = {}
local function verifyNonce(actor, nonce)
    local player = class(actor)
    local name = player:GetName()
    local now = os.time()
    local k = name .. "_" .. nonce
    if nonceTab[k] ~= nil and now - nonceTab[k] <= 5 then
        sendluamsg(actor, 9601, 1, 0, 0, "replay")
        return false
    end
    nonceTab[k] = now
    return true
end