Inconsistent base64 decode File Write

[Ricardo Fernández Serrata]

Please download the attached file for easier understanding.

I'm generating a solid-color image using a Javascript canvas, then passing it to AM as base64 to write and decode the image to storage for further use. The problem is that sometimes depending on the color and size of the image, Java throws a "bad base64" error. The weirdest thing is that switching between 16x16 to 32x32 size (and viceversa) magically solves the error for some images. The good news is that this is deterministic, so it should be easy to reproduce.

I already tried using `urlDecode`, but there's no difference, because the URI is already URL-safe, AFAIK. I gave up trying to debug what am I doing wrong. I guess I have to transcode the base64 to a "dialect" that AM can understand, maybe by using `replaceAll`? or should I use the `base64` shell commamd?

[Ricardo Fernández Serrata]

This seems to be related: https://issuetracker.google.com/issues/141497577?pli=1

[Henrik "The Developer" Lindqvist]

Maybe, but is see little reason the Canvas would produce invalid Base64.

I suspect the problem is due to % (URL) encoding of the data: URL since those do not use URL safe decoding, neither does the File write block.

Try using the Content copy block instead, it supports data: URL decoding, even when the "unsafe" URL characters have been % encoded.

[Ricardo Fernández Serrata]

Thanks! It solved the problem for all images