Dynamic master key and maintenance key

[mtrezza]

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New Feature / Enhancement Checklist

• [x] I am not disclosing a vulnerability.
• [x] I am not just asking a question.
• [x] I have searched through existing issues.

Current Limitation

The master key and maintenance key are both set on server start and cannot be changed without a server restart. This is disadvantageous when periodically rotating the keys because a key rotation also requires a server restart. This is particular problematic for a cluster of servers in which updating the keys across a large fleet can take a long time.

Feature / Enhancement Description

• Allow to set an async function for the master key instead of a string.
• Add the master key to the internal cache with a TTL, so that the function is not called every time the master key is validated

Example Use Case

New Parse Server options:

{
  masterKey: async () => await getKey(),
  masterKeyTtl: 3600,
}

Alternatives / Workarounds

Server restart.

[parse-github-assistant[bot]]

Thanks for opening this issue!

• 🎉 We are excited about your ideas for improvement!

[parseplatformorg]

🎉 This change has been released in version 8.0.0-alpha.11