ES6: migrated "cache"

app/script/cache/CacheRepository.js

@@ -0,0 +1,69 @@
+/*
+ * Wire
+ * Copyright (C) 2017 Wire Swiss GmbH
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see http://www.gnu.org/licenses/.
+ *
+ */
+
+'use strict';
+
+window.z = window.z || {};
+window.z.cache = z.cache || {};
+
+/*
+Cache repository for local storage interactions using amplify.
+
+@todo We have to come up with a smart solution to handle "amplify.store quota exceeded"
+  This happened when doing "@cache_repository.set_entity user_et"
+
+*/
+z.cache.CacheRepository = class CacheRepository {
+  constructor() {
+    this.logger = new z.util.Logger('z.auth.CacheRepository', z.config.LOGGER.OPTIONS);
+  }
+
+  /*
+  Deletes cached data.
+
+  @param {Boolean} [keep_conversation_input=false] - Should conversation input be kept
+  @param {[Array<String>]} [protected_key_patterns=[z.storage.StorageKey.AUTH.SHOW_LOGIN]] - Keys which should NOT be deleted from the cache
+
+  @return [Array<String>] Keys which have been deleted from the cache
+  */
+  clear_cache(keep_conversation_input = false, protected_key_patterns = [z.storage.StorageKey.AUTH.SHOW_LOGIN]) {
+    const deleted_keys = [];
+
+    if (keep_conversation_input) {
+      protected_key_patterns.push(z.storage.StorageKey.CONVERSATION.INPUT);
+    }
+
+    for (const stored_key in amplify.store()) {
+      let should_be_deleted = true;
+
+      for (const pattern in protected_key_patterns) {
+        if (stored_key.startsWith(protected_key_patterns[pattern])) {
+          should_be_deleted = false;
+        }
+      }
+
+      if (should_be_deleted) {
+        z.util.StorageUtil.reset_value(stored_key);
+        deleted_keys.push(stored_key);
+      }
+    }
+
+    return deleted_keys;
+  }
+};