image protection for non authenticated users

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Mário Nunes 7 posts 87 karma points

Feb 15, 2018 @ 16:52

0

Image protection for non authenticated users

Hello,

Is there a way to show images for authenticated users only?

I'm using owin authentication.

I know of the ImageProcessingModule.ValidatingRequest event, but it runs only the first time an image is requested. If the image is in cache already, it will be displayed.

Is there a way to catch and stop the cache request?

Has anyone solved a similar problem?

Thanks!

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Alex Skrypnyk 6175 posts 24186 karma points MVP 8x admin c-trib

Feb 15, 2018 @ 19:06

1

Hi Mário

You can do nothing with web browsers cache, the only thing you can do - set an expiration time for the images something like 0. Did you mean browser cache?

Thanks,

Alex

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Mário Nunes 7 posts 87 karma points

Feb 16, 2018 @ 13:45

0

Hi Alex

No, I mean the imageprocessor cache.

Thanks.

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James Jackson-South 489 posts 1747 karma points c-trib

Feb 18, 2018 @ 07:48

100

I know of the ImageProcessingModule.ValidatingRequest event, but it runs only the first time an image is requested. If the image is in cache already, it will be displayed.

I don't know where you got that idea. OnValidatingRequest is called for every request.

https://github.com/JimBobSquarePants/ImageProcessor/blob/809f2b0763441f307c6a00ee10cea5f6cd4b9d4b/src/ImageProcessor.Web/HttpModules/ImageProcessingModule.cs#L496

The cache is not checked until after.

https://github.com/JimBobSquarePants/ImageProcessor/blob/809f2b0763441f307c6a00ee10cea5f6cd4b9d4b/src/ImageProcessor.Web/HttpModules/ImageProcessingModule.cs#L576

If in doubt always check the source.

As Alex said, you're probably seeing the result of the browser cache. There's a config setting browserMaxDays where you can reduce that to 0 days.

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Mário Nunes 7 posts 87 karma points

Feb 18, 2018 @ 12:05
0
Thanks James,

You are right, it is called on every request.

I figured it out, what was happening was that even after setting e.Cancel to true, it would still return the image. But that image was the original from Umbraco without being processed. That's what caused the confusion.

My solution was to abort the request.
```
e.Context.Request.Abort();
e.Cancel = true;
return;
```
Thanks guys, you rock! :D
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