Reading a file from a UNC path and setting the correct MIME type in a HTTP request - iis

Question

How would I go about reading a file from a UNC path, discovering the proper MIME type, and streaming that out to a browser?
It feels to me like I'm re-inventing IIS, and I'll also have to maintain my own MIME type database for each file extension. Does the above request sound reasonable, or is there a better way?
I plan on streaming this out via a browser HTTP Get request on IIS7. If it matters, I'm also running Cognos on the same server. Any framework is OK (WCF, ASPX, etc)

Answer 1

Using WCF its pretty basic:
This code can be hosted under IIS/Service/WAS/etc.
I never found a convenient way to handle the mime type, you will need to have your own db that will map file extension into mime types.
[ServiceContract(SessionMode = SessionMode.NotAllowed)]
public interface IMediaRetriver
{
[OperationContract]
[WebGet(UriTemplate = "/get?f={fileName}")]
Stream Get(string fileName);
}
[ServiceBehavior(InstanceContextMode = InstanceContextMode.Single)]
public class MediaRetriver : IMediaRetriver
{
public Stream Get(string fileName)
{
// pro tips
// this will cause the file dialog to show the file name instead of "get"
WebOperationContext.Current.OutgoingResponse.Headers.Add(
"Content-disposition", string.Format("inline; filename={0}", fileName));
WebOperationContext.Current.OutgoingResponse.ContentType =
"application/octet-stream";
// you want to add sharing here also
return File.Open(fileName)
}
}