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Support for fallback keys (#3451)

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Backports support for fallback keys from Harmony, which should make E2EE
more reliable in the face of OTK exhaustion.

Signed-off-by: Neil Alexander <git@neilalexander.dev>

Co-authored-by: Neil Alexander <neilalexander@users.noreply.github.com>

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Neil 2024-12-17 19:19:15 +01:00 • committed by GitHub
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13 changed files with 446 additions and 20 deletions
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7
userapi/storage/tables/interface.go
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@ -170,6 +170,13 @@ type DeviceKeys interface {
DeleteAllDeviceKeys(ctx context.Context, txn *sql.Tx, userID string) error
}
type FallbackKeys interface {
SelectUnusedFallbackKeyAlgorithms(ctx context.Context, userID, deviceID string) ([]string, error)
InsertFallbackKeys(ctx context.Context, txn *sql.Tx, keys api.FallbackKeys) ([]string, error)
DeleteFallbackKeys(ctx context.Context, txn *sql.Tx, userID, deviceID string) error
SelectAndUpdateFallbackKey(ctx context.Context, txn *sql.Tx, userID, deviceID, algorithm string) (map[string]json.RawMessage, error)
}
type KeyChanges interface {
InsertKeyChange(ctx context.Context, userID string) (int64, error)
// SelectKeyChanges returns the set (de-duplicated) of users who have changed their keys between the two offsets.