ValidatingRequest?

[javz3]

Hi everyone,

I was wondering if there is an ImageSharp equivalent for ImageProcessors ValidatingRequest which allows devs to add custom instructions based on the URL request (Please check https://imageprocessor.org/imageprocessor-web/imageprocessingmodule/ - ImageProcessingModule.ValidatingRequest)

I want to throw a custom error/message when the requested URL contains incorrect resolutions, so people don't overload the server with numerous images - only a predefined list of resolutions will be generated and accessible.

The reason why I ask is Umbraco V9 uses ImageSharp where it once used ImageProcessor. I can't seem to find anything on the documentation for ImageSharp - https://docs.sixlabors.com/articles/imagesharp.web/gettingstarted.html

Thanks

[JimBobSquarePants]

There’s actually full API docs at the same location. You’re looking for ImageSharpMiddlewareOptions.OnParaeCommandsAsync.

[javz3]

Thanks for the quick response @JimBobSquarePants is there an example to see how this functions? Thanks again!

[JimBobSquarePants]

Sure... Here's the default implementation

ImageSharp.Web/src/ImageSharp.Web/Middleware/ImageSharpMiddlewareOptions.cs

Lines 20 to 44 in 52bcb16

	private Func<ImageCommandContext, Task> onParseCommandsAsync = c =>
	{
	if (c.Commands.Count == 0)
	{
	return Task.CompletedTask;
	}
	// It's a good idea to have this to provide very basic security.
	// We can safely use the static resize processor properties.
	uint width = c.Parser.ParseValue<uint>(
	c.Commands.GetValueOrDefault(ResizeWebProcessor.Width),
	c.Culture);
	uint height = c.Parser.ParseValue<uint>(
	c.Commands.GetValueOrDefault(ResizeWebProcessor.Height),
	c.Culture);
	if (width > 4000 && height > 4000)
	{
	c.Commands.Remove(ResizeWebProcessor.Width);
	c.Commands.Remove(ResizeWebProcessor.Height);
	}
	return Task.CompletedTask;
	};