public FileToken Decode(string tokenStr)
{
var encBys = _urlDataCodec.Decode(tokenStr);
//校验签名
var hashLen = 16;
var mdatBys = new byte[encBys.Length - hashLen];
Array.Copy(encBys, hashLen, mdatBys, 0, mdatBys.Length);
var signBys = ArrayUtil.Addition(_appSecretBytes, mdatBys);
var hashBys = Md5(signBys);
if (!ArrayUtil.Equals(hashBys, 0, encBys, 0, hashLen))
{
throw new InvalidDataException("bad sign");
}
if (mdatBys[0] != CurrentVersion)
{
throw new NotSupportedException("bad token version");
}
//解析成对象
var index = 1; //忽略版本
var pseudoId = NetBitConverter.ToUInt32(mdatBys, index);
index += 4;
var fileId = NetBitConverter.ToInt32(mdatBys, index);
index += 4;
var ownerId = NetBitConverter.ToInt32(mdatBys, index);
index += 4;
var mimeId = NetBitConverter.ToUInt32(mdatBys, index);
index += 4;
var expireTime = ToDateTime(mdatBys, index);
index += sizeof(long);
var fileCreateTime = ToDateTime(mdatBys, index);
return(new FileToken
{
PseudoId = pseudoId,
FileId = fileId,
FileOwnerId = ownerId,
MimeId = mimeId,
ExpireTime = expireTime,
FileCreateTime = fileCreateTime
});
}
public byte[] Decode(string encedStr)
{
if (encedStr == null || encedStr.Length < 2)
{
throw new ArgumentException(nameof(encedStr));
}
if (encedStr[0] == UrlDataCodecV1.CurrentVersion)
{
return(_codecV1.Decode(encedStr));
}
else
{
return(_codecV2.Decode(encedStr));
}
}
public OwnerToken Decode(string tokenStr)
{
var encBys = _urlDataCodec.Decode(tokenStr);
//校验签名
var hashLen = 20;
var mdatBys = new byte[encBys.Length - hashLen];
Array.Copy(encBys, hashLen, mdatBys, 0, mdatBys.Length);
var signBys = ArrayUtil.Addition(_appSecretBytes, mdatBys);
var hashBys = Sha1(signBys);
if (!ArrayUtil.Equals(hashBys, 0, encBys, 0, hashLen))
{
throw new InvalidDataException("bad sign");
}
if (mdatBys[0] != CurrentVersion)
{
throw new NotSupportedException("bad token version");
}
//解析成对象
var index = 1; //忽略版本
var ownerType = NetBitConverter.ToInt32(mdatBys, index);
index += 4;
var ownerId = NetBitConverter.ToInt32(mdatBys, index);
index += 4;
var expireTime = ToDateTime(mdatBys, index);
return(new OwnerToken
{
OwnerType = ownerType,
OwnerId = ownerId,
ExpireTime = expireTime
});
}