/// <summary>
/// Processes a request to determine if it matches a known file, and if so, serves it.
/// </summary>
/// <param name="context"></param>
/// <returns></returns>
public Task Invoke(HttpContext context)
{
var fileContext = new StaticFileContext(context, _options, _matchUrl, _logger, _fileProvider, _contentTypeProvider);
if (!fileContext.ValidateMethod())
{
_logger.LogRequestMethodNotSupported(context.Request.Method);
}
else if (!fileContext.ValidatePath())
{
_logger.LogPathMismatch(fileContext.SubPath);
}
else if (!fileContext.LookupContentType())
{
_logger.LogFileTypeNotSupported(fileContext.SubPath);
}
else if (!fileContext.LookupFileInfo())
{
_logger.LogFileNotFound(fileContext.SubPath);
}
else
{
// If we get here, we can try to serve the file
fileContext.ComprehendRequestHeaders();
switch (fileContext.GetPreconditionState())
{
case StaticFileContext.PreconditionState.Unspecified:
case StaticFileContext.PreconditionState.ShouldProcess:
if (fileContext.IsHeadMethod)
{
return(fileContext.SendStatusAsync(Constants.Status200Ok));
}
if (fileContext.IsRangeRequest)
{
return(fileContext.SendRangeAsync());
}
_logger.LogFileServed(fileContext.SubPath, fileContext.PhysicalPath);
return(fileContext.SendAsync());
case StaticFileContext.PreconditionState.NotModified:
_logger.LogPathNotModified(fileContext.SubPath);
return(fileContext.SendStatusAsync(Constants.Status304NotModified));
case StaticFileContext.PreconditionState.PreconditionFailed:
_logger.LogPreconditionFailed(fileContext.SubPath);
return(fileContext.SendStatusAsync(Constants.Status412PreconditionFailed));
default:
var exception = new NotImplementedException(fileContext.GetPreconditionState().ToString());
Debug.Fail(exception.ToString());
throw exception;
}
}
return(_next(context));
}
private async Task ServeStaticFile(HttpContext context, StaticFileContext fileContext)
{
fileContext.ComprehendRequestHeaders();
switch (fileContext.GetPreconditionState())
{
case StaticFileContext.PreconditionState.Unspecified:
case StaticFileContext.PreconditionState.ShouldProcess:
if (fileContext.IsHeadMethod)
{
await fileContext.SendStatusAsync(Constants.Status200Ok);
return;
}
try
{
if (fileContext.IsRangeRequest)
{
await fileContext.SendRangeAsync();
return;
}
await fileContext.SendAsync();
_logger.FileServed(fileContext.SubPath, fileContext.PhysicalPath);
return;
}
catch (FileNotFoundException)
{
context.Response.Clear();
}
await _next(context);
return;
case StaticFileContext.PreconditionState.NotModified:
_logger.FileNotModified(fileContext.SubPath);
await fileContext.SendStatusAsync(Constants.Status304NotModified);
return;
case StaticFileContext.PreconditionState.PreconditionFailed:
_logger.PreconditionFailed(fileContext.SubPath);
await fileContext.SendStatusAsync(Constants.Status412PreconditionFailed);
return;
default:
var exception = new NotImplementedException(fileContext.GetPreconditionState().ToString());
Debug.Fail(exception.ToString());
throw exception;
}
}