On Tue, 28 Jul 2015 08:24:17 -0400, Hallvord Reiar Michaelsen Steen <hst...@mozilla.com> wrote:

On Tue, Jul 28, 2015 at 1:08 PM, Chaals McCathie Nevile <
cha...@yandex-team.ru> wrote:

I'm just thinking out loud here, but this problem is similar to one
already faced by email clients, especially those which are web-based...

On Mon, 27 Jul 2015 15:03:40 -0400, Hallvord Reiar Michaelsen Steen <
hst...@mozilla.com> wrote:

 So PNG, JPG et al go in the "support
reading from clipboard" list, and the "support writing" starts out with
text/plain, text/html and text/uri-list - although it would be nice if
CSV was also considered safe enough.

I'm not sure you should directly read image formats from the clipboard,
especially if you don't know how they got there.

What are your concerns exactly? As Wez mentioned we may have to add some
transcoding - but if there's a chunk of binary data labelled as JPEG on the clipboard, and the user wants to paste this into her blog editor,
how would we do that if web content "shouldn't" read image formats from
the clipboard?

Essentially only certain things would be delivered from the clipboard - a picture in the desired format, and hopefully a certain amount of metadata. But we would be pretty explicit that unexpected stuff may well be dropped - and probably *should* in various cases like images

(I think we might actually agree in practice, and be looking for words)


You shouldn't write stuff there that can be dangerous, but you really
shouldn't read it direct. So maybe what happens is that when stuff gets
written, it goes through a process like painting it onto a canvas, and then being scraped back off as coloured pixels and "safe" metadata.

Indeed, if that's what it takes.. like the addImageFromCanvas() suggestion below. Regarding that suggestion you asked:

Is it more than syntactic sugar?

If we allow adding image data as blobs, the "normal" way with
clipboardData.items.add() it would be just a convenience method. Since
Daniel Cheng has serious concerns and good arguments against allowing that, something like addImageFromCanvas() might be a workaround that
would let users put images on the clipboard in a safe way.. If we have
neither, I guess we'll see data:image/jpeg URLs placed on the clipboard
as plain text.
-Hallvord R.

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