/// <summary>
/// 设置响应头信息
/// </summary>
/// <param name="response"></param>
/// <param name="fileInfo"></param>
/// <param name="fileLength"></param>
/// <param name="fileName"></param>
private void SetResponseHeaders(HttpResponseMessage response, CustomFileInfo.FileInfo fileInfo,
long fileLength, string fileName)
{
response.Headers.AcceptRanges.Add("bytes");
response.StatusCode = fileInfo.IsPartial ? HttpStatusCode.PartialContent
: HttpStatusCode.OK;
response.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment");
response.Content.Headers.ContentDisposition.FileName = fileName;
response.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
response.Content.Headers.ContentLength = fileInfo.Length;
if (fileInfo.IsPartial)
{
response.Content.Headers.ContentRange
= new ContentRangeHeaderValue(fileInfo.From, fileInfo.To, fileLength);
}
}
private CustomFileInfo.FileInfo GetFileInfoFromRequest(HttpRequestMessage request, long entityLength)
{
var response = new CustomFileInfo.FileInfo
{
From = 0,
To = entityLength - 1,
IsPartial = false,
Length = entityLength
};
var rangeHeader = request.Headers.Range;
if (rangeHeader != null && rangeHeader.Ranges.Count != 0)
{
if (rangeHeader.Ranges.Count > 1)
{
throw new HttpResponseException(HttpStatusCode.RequestedRangeNotSatisfiable);
}
var range = rangeHeader.Ranges.First();
if (range.From.HasValue && range.From < 0 || range.To.HasValue && range.To > entityLength - 1)
{
throw new HttpResponseException(HttpStatusCode.RequestedRangeNotSatisfiable);
}
response.From = range.From ?? 0;
response.To = range.To ?? entityLength - 1;
response.IsPartial = true;
response.Length = entityLength;
if (range.From.HasValue && range.To.HasValue)
{
response.Length = range.To.Value - range.From.Value + 1;
}
else if (range.From.HasValue)
{
response.Length = entityLength - range.From.Value + 1;
}
else if (range.To.HasValue)
{
response.Length = range.To.Value + 1;
}
}
return(response);
}