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gaia/apps/system/js/migrators/settings_migrator.js

@@ -0,0 +1,48 @@
+/* globals LazyLoader, PasscodeHelper */
+'use strict';
+(function(exports) {
+
+  /**
+   * SettingsMigrator is used to set default value if the new property is
+   * not defined in system.
+   *
+   * @class SettingsMigrator
+   */
+  var SettingsMigrator = function SettingsMigrator() {
+    this._oldPasscode = 'lockscreen.passcode-lock.code';
+    this._hashedPasscode = 'lockscreen.passcode-lock.digest.value';
+  };
+
+  SettingsMigrator.prototype = {
+    /**
+     * Query all settings key and do the migration
+     */
+    start: function km_start() {
+      var request = window.navigator.mozSettings.createLock().get('*');
+      request.onsuccess = function(e) {
+        this.keyMigration(request.result);
+      }.bind(this);
+    },
+
+    /**
+     * Place to put key migration code when the new key is used in system.
+     * @param  {Object} result all settings keys
+     */
+    keyMigration: function km_keyMigration(result) {
+      if ((result[this._oldPasscode] !== undefined) &&
+          (result[this._hashedPasscode] === undefined)) {
+        LazyLoader.load(['/shared/js/passcode_helper.js']).then(() => {
+          var set = {};
+          var passcode = result[this._oldPasscode];
+          set[this._oldPasscode] = '0000'; // this is a pre-defined default
+          PasscodeHelper.set(passcode).then(() => {
+            window.navigator.mozSettings.createLock().set(set);
+          });
+        });
+      }
+    }
+  };
+
+  exports.SettingsMigrator = SettingsMigrator;
+
+}(window));