【Lua实战】字段白名单：存档输出的字段过滤

-- 字段白名单：出口过滤
local player = class(actor)
local WHITELIST = {
    name = true, level = true, guild = true, title = true, exp = true,
}
local stripped = 0
local function filterSave(player, save)
    local out = {}
    for k, v in pairs(save) do
        if WHITELIST[k] then
            out[k] = v
        else
            stripped = stripped + 1
        end
    end
    sendmsg(player, 1, 0, "输出字段 " .. #out .. " 个，剥离 " .. stripped .. " 个内部字段。")
    return out
end

-- 白名单维护：前缀通配
local player = class(actor)
local PREFIX_ALLOW = {activity_ = true}
local function isAllowed(key)
    if WHITELIST[key] then return true end
    for prefix in pairs(PREFIX_ALLOW) do
        if string.find(key, prefix, 1, true) == 1 then
            return true
        end
    end
    return false
end
local function buildOutput(player, save)
    local out = {}
    for k, v in pairs(save) do
        if isAllowed(k) then out[k] = v end
    end
    return out
end