1 files changed, 124 insertions, 0 deletions
diff --git a/node_modules/workbox-cache-expiration/models/CacheTimestampsModel.mjs b/node_modules/workbox-cache-expiration/models/CacheTimestampsModel.mjs
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+/*
+  Copyright 2017 Google Inc.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+      https://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+*/
+
+import {DBWrapper} from 'workbox-core/_private/DBWrapper.mjs';
+import '../_version.mjs';
+
+const URL_KEY = 'url';
+const TIMESTAMP_KEY = 'timestamp';
+
+/**
+ * Returns the timestamp model.
+ *
+ * @private
+ */
+class CacheTimestampsModel {
+  /**
+   *
+   * @param {string} cacheName
+   *
+   * @private
+   */
+  constructor(cacheName) {
+    // TODO Check cacheName
+
+    this._cacheName = cacheName;
+    this._storeName = cacheName;
+
+    this._db = new DBWrapper(this._cacheName, 2, {
+      onupgradeneeded: (evt) => this._handleUpgrade(evt),
+    });
+  }
+
+  /**
+   * Should perform an upgrade of indexedDB.
+   *
+   * @param {Event} evt
+   *
+   * @private
+   */
+  _handleUpgrade(evt) {
+    const db = evt.target.result;
+    if (evt.oldVersion < 2) {
+      // Remove old databases.
+      if (db.objectStoreNames.contains('workbox-cache-expiration')) {
+        db.deleteObjectStore('workbox-cache-expiration');
+      }
+    }
+
+    db
+    .createObjectStore(this._storeName, {keyPath: URL_KEY})
+    .createIndex(TIMESTAMP_KEY, TIMESTAMP_KEY, {unique: false});
+  }
+
+  /**
+   * @param {string} url
+   * @param {number} timestamp
+   *
+   * @private
+   */
+  async setTimestamp(url, timestamp) {
+    await this._db.put(this._storeName, {
+      [URL_KEY]: new URL(url, location).href,
+      [TIMESTAMP_KEY]: timestamp,
+    });
+  }
+
+  /**
+   * Get all of the timestamps in the indexedDB.
+   *
+   * @return {Array<Objects>}
+   *
+   * @private
+   */
+  async getAllTimestamps() {
+    return await this._db.getAllMatching(this._storeName, {
+      index: TIMESTAMP_KEY,
+    });
+  }
+
+  /**
+   * Returns the timestamp stored for a given URL.
+   *
+   * @param {string} url
+   * @return {number}
+   *
+   * @private
+   */
+  async getTimestamp(url) {
+    const timestampObject = await this._db.get(this._storeName, url);
+    return timestampObject.timestamp;
+  }
+
+  /**
+   * @param {string} url
+   *
+   * @private
+   */
+  async deleteUrl(url) {
+    await this._db.delete(this._storeName, new URL(url, location).href);
+  }
+
+  /**
+   * Removes the underlying IndexedDB object store entirely.
+   */
+  async delete() {
+    await this._db.deleteDatabase();
+    this._db = null;
+  }
+}
+
+export default CacheTimestampsModel;