AppStateCloudBackupCoordinator
class AppStateCloudBackupCoordinator(storage: BackupStorage, encryptionKey: ByteArray, digestStore: AppStateBackupDigestStore) : AppStateCloudBackup
AppStateCloudBackup over an injected BackupStorage + a pre-derived AES key (SeedDerivedKeyDeriver.deriveAppStateBackupKey).
Pure logic — encrypt/decrypt the single app-state blob + a content-hash upload guard — so it's fully JVM-unit-testable with a fake storage + digest store. Unlike the manual AppStateBackup, this needs NO passkey assertion per call (the key is seed-derived), which is what makes automatic background backup possible.
Failure-tolerant by contract: fetchAppState returns null on any problem; uploadAppState is best-effort (callers wrap it in runCatching).
Constructors
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constructor(storage: BackupStorage, encryptionKey: ByteArray, digestStore: AppStateBackupDigestStore)