mail/src/js/dao/devicestorage.js

68 lines
1.7 KiB
JavaScript

/**
* High level storage api that handles all persistence on the device. If
* SQLcipher/SQLite is available, all data is securely persisted there,
* through transparent encryption. If not, the crypto API is
* used to encrypt data on the fly before persisting via a JSON store.
*/
app.dao.DeviceStorage = function(util, crypto, jsonDao, sqlcipherDao) {
'use strict';
/**
* Stores a list of encrypted items in the object store
* @param list [Array] The list of items to be persisted
* @param type [String] The type of item to be persisted e.g. 'email'
*/
this.storeEcryptedList = function(list, type, callback) {
var i, date, key, items = [];
// nothing to store
if (list.length === 0) {
callback();
return;
}
// format items for batch storing in dao
list.forEach(function(i) {
// put date in key if available... for easy querying
if (i.sentDate) {
date = util.parseDate(i.sentDate);
key = type + '_' + i.sentDate + '_' + i.id;
} else {
key = type + '_' + i.id;
}
items.push({
key: key,
object: i
});
});
jsonDao.batch(items, function() {
callback();
});
};
/**
* List stored items of a given type
* @param type [String] The type of item e.g. 'email'
* @param offset [Number] The offset of items to fetch (0 is the last stored item)
* @param num [Number] The number of items to fetch (null means fetch all)
*/
this.listEncryptedItems = function(type, offset, num, callback) {
// fetch all items of a certain type from the data-store
jsonDao.list(type, offset, num, function(encryptedList) {
callback(null, encryptedList);
});
};
/**
* Clear the whole device data-store
*/
this.clear = function(callback) {
jsonDao.clear(callback);
};
};