// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
app.Use(async(context, next) =>
{
if (!context.Request.Path.StartsWithSegments("/storage", out PathString remaining))
{
await next();
return;
}
if (!TryParseDeepZoom(remaining, out var result))
{
await next();
return;
}
if (result.format != "jpeg")
{
await next();
return;
}
var provider = context.RequestServices.GetService <ImageProvider>();
var response = context.Response;
if (!provider.TryGetImagePath(result.name, out string path))
{
response.StatusCode = 404;
await response.WriteAsync("FileNotFound.");
return;
}
RetainableDeepZoomGenerator dz = provider.RetainDeepZoomGenerator(result.name, path);
try
{
response.ContentType = "image/jpeg";
await dz.GetTileAsJpegToStreamAsync(result.level, result.col, result.row, response.Body);
}
finally
{
dz.Release();
}
});
app.UseStaticFiles();
app.UseRouting();
app.UseEndpoints(endpoints =>
{
endpoints.MapControllers();
});
}
public IActionResult GetDzi(string name)
{
if (!_provider.TryGetImagePath(name, out string path))
{
return(NotFound());
}
RetainableDeepZoomGenerator dz = _provider.RetainDeepZoomGenerator(name, path);
try
{
return(Content(dz.GetDzi(), "application/xml", Encoding.UTF8));
}
finally
{
dz.Release();
}
}
public RetainableDeepZoomGenerator RetainDeepZoomGenerator(string name, string path)
{
RetainableDeepZoomGenerator dz;
if (_cache.TryGet(name, out dz))
{
dz.Retain();
return(dz);
}
dz = new RetainableDeepZoomGenerator(OpenSlideImage.Open(path));
if (_cache.TrySet(name, dz))
{
dz.Retain();
return(dz);
}
dz.Retain();
dz.Dispose();
return(dz);
}
