nancy AsUnSafeFile

gistfile1.txt

public static class FormatterExtensions
{
    public static Response AsUnSafeFile(this IResponseFormatter formatter, string filePath, Request request)
    {
        if (string.IsNullOrWhiteSpace(filePath))
        {
            throw new Exception("filePath not defiend");
        }

        if (!File.Exists(filePath))
        {
            return HttpStatusCode.NotFound;
        }

        var lastWriteTimeUtc = File.GetLastWriteTimeUtc(filePath);
        var currentFileEtag = lastWriteTimeUtc.Ticks.ToString("x");

        var etagHeaders = request.Headers["ETag"];
        if (etagHeaders != null)
        {
            var requestEtag = etagHeaders.FirstOrDefault();
            if (requestEtag == currentFileEtag)
            {
                return HttpStatusCode.NotModified;
            }
        } 

        var ifModifiedSinceHeaders = request.Headers["If-Modified-Since"];
        var lastWriteTimeAsString = lastWriteTimeUtc.ToString("R");
        if (ifModifiedSinceHeaders != null)
        {
            var requestIfModifiedSinceHeader = ifModifiedSinceHeaders.FirstOrDefault();
            if (lastWriteTimeAsString == requestIfModifiedSinceHeader)
            {
                return HttpStatusCode.NotModified;
            }
        }

        //Cant use as file cause it validates the location of the file and we are using a network share.
        var response = new SimpleFileResponse(filePath, "application/json");
        response.Headers["ETag"] = currentFileEtag;
        response.Headers["Last-Modified"] = lastWriteTimeAsString;
        return response;

    }
}