Copy/Paste not working as expected (OnlyOffice)

[zerodarkzone]

Initial Checklist

• I understand this is a bug report and questions should be posted in the Community Discussions
• I searched issues and couldn’t find anything (or linked relevant results below)

Bug Description

Hi,
I've found a bug when using onlyoffice 9 (It also happens on some collabora versions). The copy/paste commands stopped working.

Looking at the console logs, I'm seeing this error:

[Violation] Permissions policy violation: The Clipboard API has been blocked because of a permissions policy applied to the current document. See https://crbug.com/414348233 for more details

R6d                   @  sdk-all.js:18726
f.JZ.document.oncopy  @  sdk-all.js:18713
f3d                   @  sdk-all.js:18727

I've created an issue on the OnlyOffice repo and they say it is an OpenCloud problem. ONLYOFFICE/DocumentServer#3460 (comment)

oCIS made a fix for the problem so I think you could just port it: owncloud/web#12954

Reproduction Steps

• Open a document
• Copy some text via Ctrl+C
• Paste the text via Ctrl+V (Won't work.)
• Paste the text using the Right+Click (It works only inside the editor.)

Expected Outcome

Copying text via Ctrl+C and pasting it onto a document via Ctrl+V should work.

Actual Outcome

When copying some data with Ctrl+C, it cannot be pasted anywhere using Ctrl+V. It only works inside the editor by using right+click paste. The copied data is not being added to the clipboard. This also makes it impossible to copy data from onlyoffice to an external editor.

[JammingBen]

For Collabora, this has already been fixed via #1569. Will be included in the upcoming release in ~2 weeks!

As for OnlyOffice, we do not officially support it (and are not planning to). It might still work in general though, and the fix for Collabora probably fixed it for other WOPI hosts as well.

[zerodarkzone]

@JammingBen, That should also fix the problem for OnlyOffice. Thanks