/// <summary>
/// 时间戳防盗链
/// </summary>
/// <param name="host">主机，如http://domain.com</param>
/// <param name="fileName">文件名，如 hello/world/test.jpg</param>
/// <param name="query">请求参数，如?v=1.1</param>
/// <param name="encryptKey">后台提供的key</param>
/// <param name="expireInSeconds">链接有效时长</param>
/// <returns>时间戳防盗链接</returns>
public static string CreateTimestampAntiLeechUrl(
string host,
string fileName,
string query,
string encryptKey,
int expireInSeconds)
{
var expireAt = UnixTimestamp.GetUnixTimestamp(expireInSeconds);
var expireHex = expireAt.ToString("x");
var path = $"/{Uri.EscapeUriString(fileName)}";
var toSign = $"{encryptKey}{path}{expireHex}";
var sign = Hashing.CalcMd5X(toSign);
string finalUrl;
if (!string.IsNullOrEmpty(query))
{
finalUrl = $"{host}{path}?{query}&sign={sign}&t={expireHex}";
}
else
{
finalUrl = $"{host}{path}?sign={sign}&t={expireHex}";
}
return(finalUrl);
}
/// <summary>
/// 生成默认的断点记录文件名称
/// </summary>
/// <param name="localFile">待上传的本地文件</param>
/// <param name="key">要保存的目标key</param>
/// <returns>用于记录断点信息的文件名</returns>
public static string GetDefaultRecordKey(string localFile, string key)
{
var tempDir = Environment.GetEnvironmentVariable("TEMP");
var fileInfo = new System.IO.FileInfo(localFile);
var uniqueKey = $"{localFile}:{key}:{fileInfo.LastWriteTime.ToFileTime()}";
return($"{tempDir}\\{"QiniuResume_" + Hashing.CalcMd5X(uniqueKey)}");
}
/// <summary>
/// 多部分表单数据(multi-part form-data)的分界(boundary)标识
/// </summary>
/// <returns>分界(boundary)标识字符串</returns>
public static string CreateFormDataBoundary()
{
var now = DateTime.UtcNow.Ticks.ToString();
return($"-------{QiniuCSharpSdk.Alias}Boundary{Hashing.CalcMd5X(now)}");
}
