/// <summary> 获取下载流
/// </summary>
/// <param name="fileName"></param>
/// <returns></returns>
public Stream GetDownloadStream(HttpContext httpContext, string fileName)
{
string filePath = this.GetServerFilePath(fileName);
PartialFileInfo partialFileInfo = this.GetPartialFileInfo(httpContext.Request, filePath);
this.SetResponseHeaders(httpContext.Response, partialFileInfo);
return(this.GetPartialFileStream(partialFileInfo));
}
/// <summary> 异步获取下载流
/// </summary>
/// <param name="fileName"></param>
/// <returns></returns>
public Task <Stream> GetDownloadStreamAsync(HttpContext httpContext, string fileName)
{
return(Task.Run <Stream>(() =>
{
string filePath = this.GetServerFilePath(fileName);
PartialFileInfo partialFileInfo = this.GetPartialFileInfo(httpContext.Request, filePath);
this.SetResponseHeaders(httpContext.Response, partialFileInfo);
return this.GetPartialFileStream(partialFileInfo);
}));
}
public async Task ArchiveChannel(ISocketMessageChannel channel, [Remainder] string title)
{
var messages = await channel.GetMessagesAsync().Flatten();
using (ChannelArchive archive = new ChannelArchive(title))
{
string voteEmote = _settings.Has("brackeys-emote") ? _settings.Get("brackeys-emote").Split(':').First() : string.Empty;
foreach (IMessage msg in messages)
{
ArchiveMessage archiveMessage = new ArchiveEventSubmission(msg, voteEmote);
IEnumerable <ArchiveImage> archiveImages = archiveMessage.GetMessageImages();
archive.AddMessage(archiveMessage);
foreach (ArchiveImage image in archiveImages)
{
archive.AddImage(image);
}
}
archive.CloseArchive();
string zippedArchive = archive.ZipArchive();
WeTransferClient wt = new WeTransferClient(BrackeysBot.Configuration["wetransfer-api-key"]);
// Make sure we are authorized
await wt.Authorize();
var fileInfo = new System.IO.FileInfo(zippedArchive);
// Create Partial File Information so WeTransfer knows how many files
// you're going to upload, the names of those files and their sizes
PartialFileInfo[] partialFileInfos = new PartialFileInfo[]
{
new PartialFileInfo
{
Name = fileInfo.Name,
Path = fileInfo.FullName,
Size = (int)fileInfo.Length
}
};
// Create a File Transfer which informs WeTransfer that you're about to upload files
// The second parameter is the transfer message which will show on the download page
FileTransferResponse response = await wt.CreateTransfer(partialFileInfos, $"Download the archived channel #{channel.Name}!");
// Now you can upload the files!
// The first parameter is the transfer's ID
await wt.Upload(response.ID, response.Files);
// Now you need to tell WeTransfer that your files have been uploaded
FileUploadResult result = await wt.FinalizeUpload(response.ID, response.Files);
// FileUploadResult contains the url to the download page and the date of the expiry
StringBuilder reply = new StringBuilder()
.AppendLine($"I archived the channel <#{channel.Id}> for you{(title == channel.Name ? "!" : $", under the name **{title}**!")}")
/// <summary>
/// 设置响应头信息
/// </summary>
/// <param name="response"></param>
/// <param name="partialFileInfo"></param>
/// <param name="fileLength"></param>
/// <param name="fileName"></param>
private void SetResponseHeaders(HttpResponse response, PartialFileInfo partialFileInfo)
{
response.Headers[HeaderNames.AcceptRanges] = "bytes";
response.StatusCode = partialFileInfo.IsPartial ? StatusCodes.Status206PartialContent : StatusCodes.Status200OK;
var contentDisposition = new ContentDispositionHeaderValue("attachment");
contentDisposition.SetHttpFileName(partialFileInfo.Name);
response.Headers[HeaderNames.ContentDisposition] = contentDisposition.ToString();
response.Headers[HeaderNames.ContentType] = "application/octet-stream";
//response.Headers[HeaderNames.ContentMD5] = partialFileInfo.MD5;
response.Headers[HeaderNames.ContentLength] = partialFileInfo.Length.ToString();
if (partialFileInfo.IsPartial)
{
response.Headers[HeaderNames.ContentRange] = new ContentRangeHeaderValue(partialFileInfo.From, partialFileInfo.To, partialFileInfo.FileLength).ToString();
}
}
/// <summary> 获取文件分块信息
/// </summary>
/// <param name="request"></param>
/// <param name="filePath"></param>
/// <returns></returns>
private PartialFileInfo GetPartialFileInfo(HttpRequest request, string filePath)
{
PartialFileInfo partialFileInfo = new PartialFileInfo(filePath);
if (RangeHeaderValue.TryParse(request.Headers[HeaderNames.Range].ToString(), out RangeHeaderValue rangeHeaderValue))
{
var range = rangeHeaderValue.Ranges.FirstOrDefault();
if (range.From.HasValue && range.From < 0 || range.To.HasValue && range.To > partialFileInfo.FileLength - 1)
{
return(null);
}
var from = range.From;
var to = range.To;
if (from.HasValue)
{
if (from.Value >= partialFileInfo.FileLength)
{
return(null);
}
if (!to.HasValue || to.Value >= partialFileInfo.FileLength)
{
to = partialFileInfo.FileLength - 1;
}
}
else
{
if (to.Value == 0)
{
return(null);
}
var bytes = Math.Min(to.Value, partialFileInfo.FileLength);
from = partialFileInfo.FileLength - bytes;
to = from + bytes - 1;
}
partialFileInfo.IsPartial = true;
partialFileInfo.Length = to.Value - from.Value + 1;
}
return(partialFileInfo);
}
/// <summary> 获取分块文件流
/// </summary>
/// <param name="partialFileInfo"></param>
/// <returns></returns>
private Stream GetPartialFileStream(PartialFileInfo partialFileInfo)
{
return(new PartialFileStream(partialFileInfo.FilePath, partialFileInfo.From, partialFileInfo.To));
}
