[Seaside] How to save a html5 canvas.toDataURL as a png file on the server

[Bob N.]

(I also posted this in stack overflow)

I have an image that users can annotate on the browser. I can access the
image using
    canvas.toDataURL()
...I'd like to add a 'save' option for the user to save the image on the
server.

This question has been answered for php...
    file_put_contents('test.png', base64_decode(substr($data, strpos($data,
",")+1)));
...what I need is a Seaside callback with the PNG file contents.

Is there a way to do this in Seaside?

Thanks,
Bob
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.squeakfoundation.org/pipermail/seaside/attachments/20110726/9f7bbe32/attachment.htm