Restrict screenshot D-Bus access to portal - #2940
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We also need an exception for the screenshot app https://github.com/elementary/screenshot which usually uses the portal but it does directly call the gala interface for when a non interactive screenshot is taken (which I think is only possible via the desktop actions).
Also this should probably all be async just to be safe
Apart from that LGTM thanks :)
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org.gnome.Shell.Screenshot is currently available to any session bus client. Check that the caller owns the Pantheon portal backend name, while keeping keyboard shortcuts on private methods. Test=Direct D-Bus calls returned AccessDenied; portal and keyboard shortcut captures still produced PNGs in a Pantheon Wayland session.
The Screenshot app uses Gala directly for its desktop actions. Allow its current bus owner alongside the portal backend, including when the other service is not running. Make the proxy and name-owner lookups asynchronous, including FlashArea, so caller checks do not block the compositor.
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Any client on the session bus can currently call
org.gnome.Shell.Screenshotdirectly, bypassing the screenshot portal. Restrict the exported methods to the Pantheon portal backend and Screenshot app, while keeping keyboard shortcuts on private paths. Make caller checks asynchronous.The Screenshot exception preserves its whole-screen, window and area desktop actions.
Testing
The original revision was tested in a Fedora 44 Pantheon Wayland session: unrelated direct calls returned
AccessDenied, portal deny/allow worked, and the Print shortcut produced a screenshot.