O易下载链接有效期多久失效 - 系统缓存对链接有效期的具体影响与刷新机制详解

// 链接有效期验证伪代码示例
function validateDownloadLink(linkId) {
    const linkInfo = getLinkFromCache(linkId);
    if (!linkInfo) return { valid: false, reason: "not_found" };
    
    const currentTime = Date.now();
    const expireTime = linkInfo.createTime + (72 * 60 * 60 * 1000);
    
    if (currentTime > expireTime) {
        clearCache(linkId);
        return { valid: false, reason: "expired" };
    }
    
    if (linkInfo.downloadCount >= linkInfo.maxDownloads) {
        return { valid: false, reason: "download_limit_reached" };
    }
    
    return { valid: true, remainingTime: expireTime - currentTime };
}