logins.length > 1) {
    return;
  }

  // If one login is stored and it's a fxa sync key, we update the backup to store the
  // key only.
  if (
    logins.length &&
    logins[0].hostname == lazy.FXA_PWDMGR_HOST &&
    logins[0].httpRealm == lazy.FXA_PWDMGR_REALM
  ) {
    try {
      await IOUtils.copy(this.path, this._options.backupTo);

      // This notification is specifically sent out for a test.
      Services.obs.notifyObservers(null, "logins-backup-updated");
    } catch (ex) {
      console.error(ex);
    }
  } else if (!logins.length) {
    // If no logins are stored anymore, delete backup.
    await IOUtils.remove(this._options.backupTo, {
      ignoreAbsent: true,
    });
  }
};

/**
 * Synchronously work on the data just loaded into memory.
 */
LoginStore.prototype._dataPostProcessor = function (data) {
  if (data.nextId === undefined) {
    data.nextId = 1;
  }

  // Create any arrays that are not present in the saved file.
  if (!data.logins) {
    data.logins = [];
  }

  if (!data.potentiallyVulnerablePasswords) {
    data.potentiallyVulnerablePasswords = [];
  }

  if (!data.dismissedBreachAlertsByLoginGUID) {
    data.dismissedBreachAlertsByLoginGUID = {};
  }

  // sanitize dates in logins
  if (!("version" in data) || data.version < 3) {
    let dateProperties = ["timeCreated", "timeLastUsed", "timePasswordChanged"];
    let now = Date.now();
    function getEarliestDate(login, defaultDate) {
      let earliestDate = dateProperties.reduce((earliest, pname) => {
        let ts = login[pname];
        return !ts ? earliest : Math.min(ts, earliest);
      }, defaultDate);
      return earliestDate;
    }
    for (let login of data.logins) {
      for (let pname of dateProperties) {
        let earliestDate;
        if (!login[pname] || login[pname] > MAX_DATE_MS) {
          login[pname] =
            earliestDate || (earliestDate = getEarliestDate(login, now));
        }
      }
    }
  }

  // Indicate that the current version of the code has touched the file.
  data.version = kDataVersion;

  return data;
};
PK