public static bool TryWrite(Span <byte> output, Sha256 hash, string keyType, string verb, string resourceId, string resourceType, string tokenVersion, DateTime utc, out int bytesWritten)
{
int written, consumed, totalWritten = 0;
bytesWritten = 0;
Span <byte> buffer;
unsafe
{
var pBuffer = stackalloc byte[AuthenticationHeaderBufferSize];
buffer = new Span <byte>(pBuffer, AuthenticationHeaderBufferSize);
}
s_type.CopyTo(buffer);
totalWritten += s_type.Length;
var bufferSlice = buffer.Slice(totalWritten);
if (Utf16.ToUtf8(keyType.AsReadOnlySpan().AsBytes(), bufferSlice, out consumed, out written) != TransformationStatus.Done)
{
throw new NotImplementedException("need to resize buffer");
}
totalWritten += written;
bufferSlice = buffer.Slice(totalWritten);
s_ver.CopyTo(bufferSlice);
totalWritten += s_ver.Length;
bufferSlice = buffer.Slice(totalWritten);
if (Utf16.ToUtf8(tokenVersion.AsReadOnlySpan().AsBytes(), bufferSlice, out consumed, out written) != TransformationStatus.Done)
{
throw new NotImplementedException("need to resize buffer");
}
totalWritten += written;
bufferSlice = buffer.Slice(totalWritten);
s_sig.CopyTo(bufferSlice);
totalWritten += s_sig.Length;
var front = buffer.Slice(0, totalWritten);
var payload = buffer.Slice(totalWritten);
totalWritten = 0;
if (verb.Equals("GET", StringComparison.Ordinal) || verb.Equals("get", StringComparison.Ordinal))
{
s_get.CopyTo(payload);
totalWritten += s_get.Length;
}
else if (verb.Equals("POST", StringComparison.Ordinal) || verb.Equals("post", StringComparison.Ordinal))
{
s_post.CopyTo(payload);
totalWritten += s_post.Length;
}
else if (verb.Equals("DELETE", StringComparison.Ordinal) || verb.Equals("delete", StringComparison.Ordinal))
{
s_delete.CopyTo(payload);
totalWritten += s_delete.Length;
}
else
{
if (Utf16.ToUtf8(verb.AsReadOnlySpan().AsBytes(), payload, out consumed, out written) != TransformationStatus.Done)
{
throw new NotImplementedException("need to resize buffer");
}
if (Ascii.ToLowerInPlace(payload.Slice(0, written), out written) != TransformationStatus.Done)
{
throw new NotImplementedException("need to resize buffer");
}
payload[written] = (byte)'\n';
totalWritten += written + 1;
}
bufferSlice = payload.Slice(totalWritten);
if (Utf16.ToUtf8(resourceType.AsReadOnlySpan().AsBytes(), bufferSlice, out consumed, out written) != TransformationStatus.Done)
{
throw new NotImplementedException("need to resize buffer");
}
if (Ascii.ToLowerInPlace(bufferSlice.Slice(0, written), out written) != TransformationStatus.Done)
{
throw new NotImplementedException("need to resize buffer");
}
bufferSlice[written] = (byte)'\n';
totalWritten += written + 1;
bufferSlice = payload.Slice(totalWritten);
if (Utf16.ToUtf8(resourceId.AsReadOnlySpan().AsBytes(), bufferSlice, out consumed, out written) != TransformationStatus.Done)
{
throw new NotImplementedException("need to resize buffer");
}
bufferSlice[written] = (byte)'\n';
totalWritten += written + 1;
bufferSlice = payload.Slice(totalWritten);
if (!Text.Formatters.Utf8.TryFormat(utc, bufferSlice, out written, 'l'))
{
throw new NotImplementedException("need to resize buffer");
}
bufferSlice[written] = (byte)'\n';
totalWritten += written + 1;
bufferSlice = payload.Slice(totalWritten);
bufferSlice[0] = (byte)'\n';
totalWritten += 1;
hash.Append(buffer.Slice(front.Length, totalWritten));
hash.GetHash(buffer.Slice(front.Length, hash.OutputSize));
if (!Base64.EncodeInPlace(buffer.Slice(front.Length), hash.OutputSize, out written))
{
throw new NotImplementedException("need to resize buffer");
}
var len = front.Length + written;
if (!UrlEncoder.TryEncode(buffer.Slice(0, len), output, out bytesWritten))
{
bytesWritten = 0;
return(false);
}
return(true);
}
