1  //! Federation-stored client backups
 2  //!
 3  //! Federations can store client-encrypted backups to help
 4  //! clients recover from a snapshot, instead of a blank slate.
 5  use std::time::SystemTime;
 6  
 7  use fedimint_core::encoding::{Decodable, Encodable};
 8  use fedimint_core::{impl_db_lookup, impl_db_record};
 9  use serde::{Deserialize, Serialize};
10  
11  use crate::db::DbKeyPrefix;
12  
13  /// Key used to store user's ecash backups
14  #[derive(Debug, Clone, Copy, Encodable, Decodable, Serialize)]
15  pub struct ClientBackupKey(pub secp256k1_zkp::PublicKey);
16  
17  #[derive(Debug, Encodable, Decodable)]
18  pub struct ClientBackupKeyPrefix;
19  
20  impl_db_record!(
21      key = ClientBackupKey,
22      value = ClientBackupSnapshot,
23      db_prefix = DbKeyPrefix::ClientBackup,
24  );
25  impl_db_lookup!(key = ClientBackupKey, query_prefix = ClientBackupKeyPrefix);
26  
27  /// User's backup, received at certain time, containing encrypted payload
28  #[derive(Debug, Clone, PartialEq, Eq, Encodable, Decodable, Serialize, Deserialize)]
29  pub struct ClientBackupSnapshot {
30      pub timestamp: SystemTime,
31      #[serde(with = "fedimint_core::hex::serde")]
32      pub data: Vec<u8>,
33  }