Hey,

Sorry this is like half an answer but hoping it's something you or somebody else can pursue in finding the full answer for.

So I have a class file called ImageProcessing.cs which attaches events to the ValidatingRequest and OnPostProcessing event handlers of ImageProcessingModule. My plan was to store a flag in the HttpContext Items in the ValidatingRequest event containing the original URL of the image (if the nocache querystring is found), and delete the file in the OnPostProcessing event using the CachedImagePath variable of PostProcessingEventArgs which is the absolute path to the newly cached image.

Unfortunately CachedImagePath is no longer part of PostProcessingEventArgs & the documentation (https://imageprocessor.org/imageprocessor-web/imageprocessingmodule/) is out of date and unable to find an alternative.

Here's what I've started, good luck to anybody who finds a solution:

    public class SubscribeToContentServiceSavingComposer : IUserComposer
{
    public void Compose(Composition composition)
    {
        composition.Components().Append<SubscribeToContentServiceSavingComponent>();
    }
}

public class SubscribeToContentServiceSavingComponent : Umbraco.Core.Composing.IComponent
{
    public void Initialize()
    {
        ImageProcessingModule.ValidatingRequest += (sender, args) =>
        {
            var queryString = HttpUtility.ParseQueryString(args.QueryString);
            if (queryString["nocache"] != null)
            {
                args.Context.Items.Add($"DeleteFromCache-{args.Context.Request.Url.AbsolutePath}", true);
            }
        };
        ImageProcessingModule.OnPostProcessing += (sender, args) =>
        {
            //PostProcessingEventArgs
            if (args.Context.Items[$"DeleteFromCache-{args.Context.Request.Url.AbsolutePath}"] != null)
            {
                System.IO.File.Delete(args.CachedImagePath)
            }
        };
    }
}

Regards,

Andy

I don't know about a query string parameter, but there is a cache config file: https://imageprocessor.org/imageprocessor-web/configuration/#cacheconfig

You could set maxDays to a low value and trimCache to true, and that might help, but I'm not sure.

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