VideoEntity.cs

using System.Numerics;
using Lagrange.Core.Internal.Events.Message;
using Lagrange.Core.Internal.Packets.Message;
using Lagrange.Core.Internal.Packets.Service;
using Lagrange.Core.Utility;
using Lagrange.Core.Utility.Cryptography;
using Lagrange.Core.Utility.Extension;

namespace Lagrange.Core.Message.Entities;

public class VideoEntity : RichMediaEntityBase
{
    private static readonly byte[] DefaultThumbnail = Convert.FromBase64String("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");

    internal override Lazy<Stream>? Stream { get; }

    public Vector2 VideoSize { get; init; }

    public uint VideoLength { get; init; }

    internal Lazy<Stream>? ThumbnailStream { get; }

    internal ImageEntity? ThumbnailEntity { get; private set; }

    public VideoEntity() { }

    public VideoEntity(Stream stream, Stream? thumbnailStream = null, bool disposeOnCompletion = false)
    {
        Stream = new Lazy<Stream>(() => stream);
        ThumbnailStream = new Lazy<Stream>(() => thumbnailStream ?? new MemoryStream(DefaultThumbnail));
        DisposeOnCompletion = disposeOnCompletion;
    }

    public override async Task Preprocess(BotContext context, BotMessage message)
    {
        ArgumentNullException.ThrowIfNull(Stream);
        ArgumentNullException.ThrowIfNull(ThumbnailStream);

        ThumbnailEntity = new ImageEntity(ThumbnailStream.Value);

        try
        {
            if (message.IsGroup())
            {
                IsGroup = true;

                var result = await context.EventContext.SendEvent<VideoGroupUploadEventResp>(new VideoGroupUploadEventReq(message, this));
                _compat = result.Compat;
                MsgInfo = result.Info;

                if (result.Ext != null)
                {
                    result.Ext.Hash.FileSha1 = CalculateStreamBytes(Stream.Value);
                    await context.HighwayContext.UploadFile(Stream.Value, 1005, ProtoHelper.Serialize(result.Ext));
                }

                if (result.SubExt != null)
                {
                    result.SubExt.Hash.FileSha1 = CalculateStreamBytes(ThumbnailStream.Value);
                    await context.HighwayContext.UploadFile(ThumbnailStream.Value, 1006, ProtoHelper.Serialize(result.SubExt));
                }
            }
            else
            {
                var result = await context.EventContext.SendEvent<VideoUploadEventResp>(new VideoUploadEventReq(message, this));
                _compat = result.Compat;
                MsgInfo = result.Info;

                if (result.Ext != null)
                {
                    result.Ext.Hash.FileSha1 = CalculateStreamBytes(Stream.Value);
                    await context.HighwayContext.UploadFile(Stream.Value, 1001, ProtoHelper.Serialize(result.Ext));
                }

                if (result.SubExt != null)
                {
                    result.SubExt.Hash.FileSha1 = CalculateStreamBytes(ThumbnailStream.Value);
                    await context.HighwayContext.UploadFile(ThumbnailStream.Value, 1002, ProtoHelper.Serialize(result.SubExt));
                }
            }
        }
        finally
        {
            if (DisposeOnCompletion)
            {
                await Stream.Value.DisposeAsync();
                await ThumbnailStream.Value.DisposeAsync();
            }
        }
    }

    public override async Task Postprocess(BotContext context, BotMessage message)
    {
        NTV2RichMediaDownloadEventResp result = message.IsGroup()
            ? await context.EventContext.SendEvent<VideoGroupDownloadEventResp>(new VideoGroupDownloadEventReq(message, this))
            : await context.EventContext.SendEvent<VideoDownloadEventResp>(new VideoDownloadEventReq(message, this));

        FileUrl = result.Url;
    }

    public override string ToPreviewString() => "[视频]";

    internal override Elem[] Build()
    {
        if (_compat == null)
        {
            return
            [
                new Elem { VideoFile = ProtoHelper.Deserialize<VideoFile>(_compat) },
                new Elem()
                {
                    CommonElem = new CommonElem
                    {
                        ServiceType = 48,
                        PbElem = ProtoHelper.Serialize(MsgInfo ?? throw new ArgumentNullException(nameof(MsgInfo))),
                        BusinessType = IsGroup ? 21u : 11u,
                    }
                }
            ];
        }
        else
        {
            return
            [
                new Elem()
                {
                    CommonElem = new CommonElem
                    {
                        ServiceType = 48,
                        PbElem = ProtoHelper.Serialize(MsgInfo ?? throw new ArgumentNullException(nameof(MsgInfo))),
                        BusinessType = IsGroup ? 21u : 11u,
                    }
                }
            ];
        }
    }

    internal override IMessageEntity? Parse(List<Elem> elements, Elem target)
    {
        if (target.CommonElem is { BusinessType: 11 or 21 } commonElem)
        {
            var msgInfo = ProtoHelper.Deserialize<MsgInfo>(commonElem.PbElem.Span);
            var videoInfo = msgInfo.MsgInfoBody[0].Index.Info;
            var thumbnailInfo = msgInfo.MsgInfoBody[1].Index.Info;
            return new VideoEntity
            {
                MsgInfo = msgInfo,
                VideoSize = new Vector2(videoInfo.Width, videoInfo.Height),
                VideoLength = videoInfo.Time
            };
        }
        return null;
    }

    private static List<byte[]> CalculateStreamBytes(Stream inputStream)
    {
        const int blockSize = 1024 * 1024;

        inputStream.Seek(0, SeekOrigin.Begin);
        var byteArrayList = new List<byte[]>();
        var sha1 = new Sha1Stream();

        var buffer = new byte[Sha1Stream.Sha1BlockSize];
        var digest = new byte[Sha1Stream.Sha1DigestSize];
        int lastRead;

        while (true)
        {
            int read = inputStream.Read(buffer);
            if (read < Sha1Stream.Sha1BlockSize)
            {
                lastRead = read;
                break;
            }

            sha1.Update(buffer, Sha1Stream.Sha1BlockSize);
            if (inputStream.Position % blockSize == 0)
            {
                sha1.Hash(digest, false);
                byteArrayList.Add((byte[])digest.Clone());
            }
        }

        sha1.Update(buffer, lastRead);
        sha1.Final(digest);
        byteArrayList.Add((byte[])digest.Clone());

        return byteArrayList;
    }
}