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 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
});
}
private async ValueTask <long> ReadCommitTimeOffset(uint index)
{
var offsetData = new byte[sizeof(int)];
if (offsetData.Length != await ReadFromChunkAsync("GDA2", index * sizeof(int), offsetData).ConfigureAwait(false))
{
return(long.MinValue);
}
int v = NetBitConverter.ToInt32(offsetData, 0);
if (v >= 0)
{
return(v);
}
offsetData = new byte[sizeof(long)];
if (offsetData.Length != await ReadFromChunkAsync("GDO2", (~v) * sizeof(long), offsetData).ConfigureAwait(false))
{
return(long.MinValue);
}
return(NetBitConverter.ToInt64(offsetData, 0));
}
private async ValueTask <bool> RefillAsync(bool allowWait)
{
if (_state <= ewah_state.start && !allowWait && Inner.Peek().IsEmpty)
{
return(false);
}
if (_lengthBits is null)
{
var bb = await Inner.ReadFullAsync(4 + 4).ConfigureAwait(false);
_lengthBits = NetBitConverter.ToUInt32(bb, 0);
_compressedSize = NetBitConverter.ToInt32(bb, 4);
_left = _compressedSize;
_state = ewah_state.start;
}
int peekLength = Inner.Peek().Length / sizeof(ulong);
_wpos = 0;
switch (_state)
{
case ewah_state.start:
ulong curOp = await Inner.ReadNetworkUInt64Async().ConfigureAwait(false);
_repBit = (curOp & 1UL) != 0;
_repCount = (uint)(curOp >> 1);
_rawCount = (int)(curOp >> 33);
_left--;
peekLength--;
_state = ewah_state.same;
goto case ewah_state.same;
case ewah_state.same:
byte val = _repBit ? (byte)0xFF : (byte)0;
while (_repCount > 0 && _wpos + 8 < _buffer.Length)
{
_buffer[_wpos++] = val;
_buffer[_wpos++] = val;
_buffer[_wpos++] = val;
_buffer[_wpos++] = val;
_buffer[_wpos++] = val;
_buffer[_wpos++] = val;
_buffer[_wpos++] = val;
_buffer[_wpos++] = val;
_repCount--;
}
if (_repCount > 0)
{
_readable = new BucketBytes(_buffer, 0, _wpos);
return(true);
}
_state = ewah_state.raw;
goto case ewah_state.raw;
case ewah_state.raw:
while (_rawCount > 0)
{
if ((_wpos > 8 && peekLength < 8) || (_wpos + 8 >= _buffer.Length))
{
// Avoid new reads if we already have something. Return result
_readable = new BucketBytes(_buffer, 0, _wpos);
return(true);
}
var bb = await Inner.ReadFullAsync(sizeof(ulong)).ConfigureAwait(false);
if (bb.Length != sizeof(ulong))
{
throw new BucketEofException(Inner);
}
peekLength--;
_left--;
_rawCount--;
for (int i = bb.Length - 1; i >= 0; i--)
{
_buffer[_wpos++] = bb[i];
}
}
if (_left == 0)
{
_state = ewah_state.footer;
_readable = new BucketBytes(_buffer, 0, _wpos);
return(true);
}
_state = ewah_state.start;
goto case ewah_state.start;
case ewah_state.footer:
await Inner.ReadNetworkUInt32Async().ConfigureAwait(false);
_state = ewah_state.done;
goto case ewah_state.done;
case ewah_state.done:
default:
return(false);
}
}