Michael Zalimeni b1b05f0bac
[NET-4703] Prevent partial application of Envoy extensions (#18068)
Prevent partial application of Envoy extensions

Ensure that non-required extensions do not change xDS resources before
exiting on failure by cloning proto messages prior to applying each
extension.

To support this change, also move `CanApply` checks up a layer and make
them prior to attempting extension application, s.t. we avoid
unnecessary copies where extensions can't be applied.

Last, ensure that we do not allow panics from `CanApply` or `Extend`
checks to escape the attempted extension application.
2023-07-31 15:24:33 -04:00
..
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