Feature policy implementation for gwt #5784
Merged
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With the feature policy, developers can allow and disallow some web browser features in iframes. If the game wants to access a disallowed feature, an error is thrown. This happens for example on itch.io. See for example the game of @MrStahlfelge for the game jam https://mrstahlfelge.itch.io/gdxjam1908. Make sure to use chrome. There will be an error in the console
Uncaught (in promise) DOMException: Failed to construct 'Accelerometer': Access to sensor features is disallowed by feature policy
This PR adds a check whether the feature, in this case accelerometer, is allowed. If not isPeripheralAvailable returns false and the setupAccelerometer method wont get called.
https://developers.google.com/web/updates/2018/06/feature-policy
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Feature-Policy