【安全加密】私聊频控与黑名单：骚扰防护的双闸设计

---私聊触发：频率与黑名单双重校验
function privatechat(actor, target, sMsg)
    local key = actor:GetUserId() .. ":" .. target:GetUserId()
    if blacklist[key] or blacklist[actor:GetUserId()] then
        return false
    end
    local rec = chatRate[key] or { count = 0, windowAt = os.time() }
    if os.time() - rec.windowAt > 60 then
        rec.count, rec.windowAt = 0, os.time()
    end
    rec.count = rec.count + 1
    chatRate[key] = rec
    if rec.count > 10 then
        sendmsg(actor, 1, "发送过于频繁，请稍后再试")
        return false
    end
    return true
end

---黑名单：被拉黑后单向静默
function BlackList.block(userId, blockedId)
    blacklist[userId .. "->" .. blockedId] = os.time()
    sendmsg(userId, 1, "已拉黑对方，将不再收到其私聊")
end