k8s/api: mitigate a path traversal bug #423
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What problem does this PR solve?
A path traversal bug presents in the re-collect API. We use the ID to build file path for collected data, but if the input
idis a relative path like./../../../../etc/passwdit could access those files outside the diag directory.What is changed and how it works?
The ID is a base52 encoded timestamp, so just try to decode it and refuses any input that is not a valid base52 encoded timestamp.