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https://issues.apache.org/jira/browse/GUACAMOLE-24?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16152239#comment-16152239
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Mathias commented on GUACAMOLE-24:
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>From Firefox 54 and above, interact with the clipboard via
>document.execCommand("copy") is possible. Copy is working, but
>document.execCommand("Paste"); is not working.
[https://developer.mozilla.org/en-US/Add-ons/WebExtensions/Interact_with_the_clipboard]
[https://developer.mozilla.org/en-US/Firefox/Releases/41#InterfacesAPIsDOM]
For security reasons, Firefox doesn't let JavaScript code use clipboard related
features (copy, paste, etc.) by default. You can enable them by setting the
preferences shown below using about:config:
{code:java}
dom.event.clipboardevents.enabled=true
capability.policy.allowclipboard.sites=https://xxx
capability.policy.allowclipboard.Clipboard.cutcopy=allAccess
capability.policy.allowclipboard.Clipboard.paste=allAccess
{code}
[https://developer.mozilla.org/en-US/docs/Web/Guide/HTML/Editable_content]
Maybe some bugs are not resolved. Permission and implementation for scripted
paste
[https://bugzilla.mozilla.org/show_bug.cgi?id=1272296]
> Directly integrate local clipboard
> ----------------------------------
>
> Key: GUACAMOLE-24
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-24
> Project: Guacamole
> Issue Type: New Feature
> Components: guacamole
> Reporter: Michael Jumper
> Fix For: 0.9.10-incubating
>
>
> {panel:bgColor=#FFFFEE}
> *The description of this issue was copied from
> [GUAC-1480|https://glyptodon.org/jira/browse/GUAC-1480], an issue in the JIRA
> instance used by the Guacamole project prior to its acceptance into the
> Apache Incubator.*
> Comments, attachments, related issues, and history from prior to acceptance
> *have not been copied* and can be found instead at the original issue.
> {panel}
> Thanks to recent improvements in browser handling of clipboard, direct
> integration of the local clipboard is now possible. Cut/copy via the keyboard
> can be written to work in all cases, while the general case will require
> either:
> # -The Chrome [Allow
> Clipboard|https://chrome.google.com/webstore/detail/allow-clipboard/bgafccceonganlcmcojjacanoadnhmac?hl=en]
> extension.- Our [Clipboard Permission Manager
> extension|https://chrome.google.com/webstore/detail/clipboard-permission-mana/ipbhneeanpgkaleihlknhjiaamobkceh].
> # Browser support for prompting for clipboard permission upon use of the
> standard {{execCommand()}} (currently only IE11).
> The situation for Chrome, Firefox, etc. is suboptimal, but still far better
> than before, there is hope that other browsers will follow the mechanism used
> by IE11 and allow webapps to request permission. The negative effects of the
> old style of clipboard integration are no longer an issue.
> {panel:title=IMPORTANT|bgColor=#FFFFEE}
> For this integration to be acceptable, it *MUST NOT* disturb the remote
> clipboard except when the local clipboard actually changes. It would be
> extremely frustrating if the user copies something not supported for the
> Guacamole clipboard, like a file, only to find it immediately overwritten by
> the text they copied previously.
> {panel}
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