【安全加密】名单体系：黑白灰名单的分级管理

---三级名单：黑、白、灰
local Lists = { black = {}, white = {}, gray = {} }

function Lists.check(list, key)
    local entry = Lists[list][key]
    if not entry then return false end
    -- 名单条目带过期时间，到期自动失效
    if entry.expireAt and entry.expireAt < os.time() then
        Lists[list][key] = nil
        return false
    end
    return true, entry
end

---加入名单：带原因与期限
function Lists.add(list, key, reason, hours)
    Lists[list][key] = {
        reason = reason,
        expireAt = hours and os.time() + hours * 3600 or nil,
    }
end

---名单的流转：黑名单到期转灰名单观察
function Lists.onBlackExpire(key)
    -- 黑名单到期：转入灰名单观察 30 天
    Lists.add('gray', key, 'black_expired', 30 * 24)
    Gray.watch(key)
end

---白名单的定期复审
setontimerex(135, 86400)
function Lists.whiteReview()
    for key, entry in pairs(Lists.white) do
        if not Review.stillValid(key) then
            Lists.white[key] = nil
            Ops.log('白名单失效: ' .. key)
        end
    end
end