/// <summary>
///
/// </summary>
/// <param name="environment"></param>
/// <returns></returns>
public Task Invoke(IDictionary<string, object> environment)
{
// Check if the URL matches any expected paths
var context = new StaticFileContext(environment, _options, _matchUrl);
if (context.ValidateMethod()
&& context.ValidatePath()
&& context.LookupContentType()
&& context.LookupFileInfo())
{
context.ComprehendRequestHeaders();
context.ApplyResponseHeaders();
StaticFileContext.PreconditionState preconditionState = context.GetPreconditionState();
if (preconditionState == StaticFileContext.PreconditionState.NotModified)
{
return context.SendStatusAsync(Constants.Status304NotModified);
}
if (preconditionState == StaticFileContext.PreconditionState.PreconditionFailed)
{
return context.SendStatusAsync(Constants.Status412PreconditionFailed);
}
if (context.IsHeadMethod)
{
return context.SendStatusAsync(Constants.Status200Ok);
}
return context.SendAsync(Constants.Status200Ok);
}
return _next(environment);
}
/// <summary>
/// Processes a request to determine if it matches a known file, and if so, serves it.
/// </summary>
/// <param name="environment">OWIN environment dictionary which stores state information about the request, response and relevant server state.</param>
/// <returns></returns>
public Task Invoke(IDictionary<string, object> environment)
{
IOwinContext context = new OwinContext(environment);
var fileContext = new StaticFileContext(context, _options, _matchUrl);
if (fileContext.ValidateMethod()
&& fileContext.ValidatePath()
&& fileContext.LookupContentType()
&& fileContext.LookupFileInfo())
{
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();
}
return fileContext.SendAsync();
case StaticFileContext.PreconditionState.NotModified:
return fileContext.SendStatusAsync(Constants.Status304NotModified);
case StaticFileContext.PreconditionState.PreconditionFailed:
return fileContext.SendStatusAsync(Constants.Status412PreconditionFailed);
default:
throw new NotImplementedException(fileContext.GetPreconditionState().ToString());
}
}
return _next(environment);
}
