public override void ExecuteResult(ControllerContext context)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
ResumeRequest resumingRequest = new ResumeRequest(context.HttpContext, FileContents.Length)
{
FileName = _fileName
};
context.HttpContext.Response.Headers[HttpHeaders.AccessControlExposeHeaders] = HttpHeaders.ContentDisposition;
ExecuteResultBody(context, resumingRequest);
}
public virtual void ExecuteResultBody(ControllerContext context, ResumeRequest resumingRequest)
{
WriteCommonHeaders(context, resumingRequest);
if (ShouldProceedAfterEvaluatingPreconditions(context.HttpContext, resumingRequest))
{
using (FileContents)
{
if (resumingRequest.IsRangeRequest)
{
WritePartialContent(context, FileContents, resumingRequest);
}
else
{
WriteFullContent(context, FileContents);
}
}
}
}
protected virtual void WriteCommonHeaders(ControllerContext context, ResumeRequest resumingRequest)
{
context.HttpContext.Response.ContentType = resumingRequest.IsMultipartRequest ? $"multipart/byteranges; boundary={MultipartBoundary}" : ContentType;
context.HttpContext.Response.AddHeader(HttpWorkerRequest.GetKnownResponseHeaderName(HttpWorkerRequest.HeaderAcceptRanges), "bytes");
if (!string.IsNullOrEmpty(resumingRequest.FileName))
{
context.HttpContext.Response.AddHeader("Content-Disposition", $"inline; filename=\"{resumingRequest.FileName}\"");
}
if (!string.IsNullOrEmpty(EntityTag))
{
context.HttpContext.Response.AddHeader(HttpWorkerRequest.GetKnownResponseHeaderName(HttpWorkerRequest.HeaderEtag), EntityTag);
}
if (LastModified.HasValue)
{
context.HttpContext.Response.AddHeader(HttpWorkerRequest.GetKnownResponseHeaderName(HttpWorkerRequest.HeaderLastModified), LastModified.Value.ToString("R"));
}
}
protected virtual bool ShouldProceedAfterEvaluatingPreconditions(HttpContextBase context, ResumeRequest resumingRequest)
{
var request = context.Request;
string check;
DateTimeOffset preconditionDateTime;
if (!string.IsNullOrEmpty(check = (request.Headers[HttpWorkerRequest.GetKnownRequestHeaderName(HttpWorkerRequest.HeaderIfRange)])))
{
if (DateTimeOffset.TryParse(check, out preconditionDateTime))
{
if ((LastModified.Value - preconditionDateTime).TotalSeconds > 1)
{
resumingRequest.Ranges = null;
}
}
else
{
if (!check.Equals(EntityTag))
{
resumingRequest.Ranges = null;
}
}
}
if (!string.IsNullOrEmpty(check = (request.Headers[HttpWorkerRequest.GetKnownRequestHeaderName(HttpWorkerRequest.HeaderIfMatch)])))
{
IEnumerable <string> entitiesTags = check.Split(',');
if ((string.IsNullOrEmpty(EntityTag) && entitiesTags.Any()) || (!entitiesTags.Any(entity => entitiesTags.Equals(EntityTag))))
{
context.Response.StatusCode = (int)HttpStatusCode.PreconditionFailed;
return(false);
}
}
if (!string.IsNullOrEmpty(check = (request.Headers[HttpWorkerRequest.GetKnownRequestHeaderName(HttpWorkerRequest.HeaderIfNoneMatch)])))
{
IEnumerable <string> entitiesTag = check.Split(',');
if ((!string.IsNullOrEmpty(EntityTag) && entitiesTag.Contains("*")) || (entitiesTag.Any(entity => entity.Equals(EntityTag))))
{
if (context.Request.RequestType == "GET" || context.Request.RequestType == "HEAD")
{
context.Response.StatusCode = (int)HttpStatusCode.NotModified;
return(false);
}
else
{
context.Response.StatusCode = (int)HttpStatusCode.PreconditionFailed;
return(false);
}
}
}
if (!string.IsNullOrEmpty(check = (request.Headers[HttpWorkerRequest.GetKnownRequestHeaderName(HttpWorkerRequest.HeaderIfUnmodifiedSince)])))
{
if (DateTimeOffset.TryParse(check, out preconditionDateTime))
{
if (!LastModified.HasValue || ((LastModified.Value - preconditionDateTime).TotalSeconds > 0))
{
context.Response.StatusCode = (int)HttpStatusCode.PreconditionFailed;
return(false);
}
}
}
if (!string.IsNullOrEmpty(check = (request.Headers[HttpWorkerRequest.GetKnownRequestHeaderName(HttpWorkerRequest.HeaderIfModifiedSince)])))
{
if (DateTimeOffset.TryParse(check, out preconditionDateTime))
{
if (LastModified.HasValue)
{
if ((LastModified.Value - preconditionDateTime).TotalSeconds < 1)
{
context.Response.StatusCode = (int)HttpStatusCode.NotModified;
return(false);
}
}
}
}
return(true);
}
public virtual void WritePartialContent(ControllerContext context, Stream fileContent, ResumeRequest resumingRequest)
{
var response = context.HttpContext.Response;
response.StatusCode = (int)HttpStatusCode.PartialContent;
if (!resumingRequest.IsMultipartRequest)
{
context.HttpContext.Response.AddHeader(HttpWorkerRequest.GetKnownResponseHeaderName(HttpWorkerRequest.HeaderContentRange), $"bytes {resumingRequest.Ranges.First().Start}-{resumingRequest.Ranges.First().End}/{fileContent.Length}");
}
foreach (var range in resumingRequest.Ranges)
{
if (!response.IsClientConnected)
{
return;
}
if (resumingRequest.IsMultipartRequest)
{
response.Output.WriteLine($"--{MultipartBoundary}");
response.Output.WriteLine($"{HttpWorkerRequest.GetKnownResponseHeaderName(HttpWorkerRequest.HeaderContentType)}: {ContentType}");
response.Output.WriteLine($"{HttpWorkerRequest.GetKnownResponseHeaderName(HttpWorkerRequest.HeaderContentRange)}: bytes {resumingRequest.Ranges.First().Start}-{resumingRequest.Ranges.First().End}/{fileContent.Length}");
response.Output.WriteLine();
}
WriteBinaryData(context, fileContent, range.Start, range.End);
if (resumingRequest.IsMultipartRequest)
{
response.Output.WriteLine();
}
}
if (resumingRequest.IsMultipartRequest)
{
response.Output.WriteLine($"--{MultipartBoundary}--");
response.Output.WriteLine();
}
}