【框架设计】兑换码系统：码表生成与防刷核销

local CODE_CHARS = "ABCDEFGHJKLMNPQRSTUVWXYZ23456789"
function Redeem.gen(prefix, count)
    local codes = {}
    for i = 1, count do
        local s = {}
        for j = 1, 10 do
            local k = math.random(#CODE_CHARS)
            s[j] = CODE_CHARS:sub(k, k)
        end
        codes[#codes + 1] = prefix .. table.concat(s)
    end
    return codes
end

function Redeem.redeem(plr, code)
    local hash = QF_Sha1(code)
    local row = codeTable[hash]
    if not row then return false, "兑换码无效" end
    if row.usedBy then return false, "已被使用" end
    row.usedBy = plr.id
    row.usedAt = os.time()
    QF_GiveItem(plr, row.itemId, row.count)
    QF_LogRedeem(plr.id, code)
    return true
end