2 files changed, 221 insertions, 0 deletions
diff --git a/node_modules/workbox-precaching/models/PrecacheEntry.mjs b/node_modules/workbox-precaching/models/PrecacheEntry.mjs
new file mode 100644
index 00000000..8138edfa
--- /dev/null
+++ b/node_modules/workbox-precaching/models/PrecacheEntry.mjs
@@ -0,0 +1,78 @@
+/*
+  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 '../_version.mjs';
+
+/**
+ * Used as a consistent way of referencing a URL to precache.
+ *
+ * @private
+ * @memberof module:workbox-precaching
+ */
+export default class PrecacheEntry {
+/**
+ * This class ensures all cache list entries are consistent and
+ * adds cache busting if required.
+ *
+ * @param {*} originalInput
+ * @param {string} url
+ * @param {string} revision
+ * @param {boolean} shouldCacheBust
+ */
+  constructor(originalInput, url, revision, shouldCacheBust) {
+    this._originalInput = originalInput;
+    this._entryId = url;
+    this._revision = revision;
+    const requestAsCacheKey = new Request(url, {credentials: 'same-origin'});
+    this._cacheRequest = requestAsCacheKey;
+    this._networkRequest = shouldCacheBust ?
+      this._cacheBustRequest(requestAsCacheKey) : requestAsCacheKey;
+  }
+
+  /**
+   * This method will either use Request.cache option OR append a cache
+   * busting parameter to the URL.
+   *
+   * @param {Request} request The request to cache bust
+   * @return {Request} A cachebusted Request
+   *
+   * @private
+   */
+  _cacheBustRequest(request) {
+    let url = request.url;
+    const requestOptions = {
+      credentials: 'same-origin',
+    };
+    if ('cache' in Request.prototype) {
+      // Make use of the Request cache mode where we can.
+      // Reload skips the HTTP cache for outgoing requests and updates
+      // the cache with the returned response.
+      requestOptions.cache = 'reload';
+    } else {
+      const parsedURL = new URL(url, location);
+
+      // This is done so the minifier can mangle 'global.encodeURIComponent'
+      const _encodeURIComponent = encodeURIComponent;
+
+      parsedURL.search += (parsedURL.search ? '&' : '') +
+        _encodeURIComponent(`_workbox-cache-bust`) + '=' +
+        _encodeURIComponent(this._revision);
+      url = parsedURL.toString();
+    }
+
+    return new Request(url, requestOptions);
+  }
+}
diff --git a/node_modules/workbox-precaching/models/PrecachedDetailsModel.mjs b/node_modules/workbox-precaching/models/PrecachedDetailsModel.mjs
new file mode 100644
index 00000000..55f1420d
--- /dev/null
+++ b/node_modules/workbox-precaching/models/PrecachedDetailsModel.mjs
@@ -0,0 +1,143 @@
+/*
+  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';
+
+// Allows minifier to mangle this name
+const REVISON_IDB_FIELD = 'revision';
+const URL_IDB_FIELD = 'url';
+const DB_STORE_NAME = 'precached-details-models';
+/**
+ * This model will track the relevant information of entries that
+ * are cached and their matching revision details.
+ *
+ * @private
+ */
+class PrecachedDetailsModel {
+  /**
+   * Construct a new model for a specific cache.
+   *
+   * @param {string} dbName
+   * @private
+   */
+  constructor(dbName) {
+    // This ensures the db name contains only letters, numbers, '-', '_' and '$'
+    const filteredDBName = dbName.replace(/[^\w-]/g, '_');
+    this._db = new DBWrapper(filteredDBName, 2, {
+      onupgradeneeded: this._handleUpgrade,
+    });
+  }
+
+  /**
+   * Should perform an upgrade of indexedDB.
+   *
+   * @param {Event} evt
+   *
+   * @private
+   */
+  _handleUpgrade(evt) {
+    const db = evt.target.result;
+    if (evt.oldVersion < 2) {
+      // IndexedDB version 1 used both 'workbox-precaching' and
+      // 'precached-details-model' before upgrading to version 2.
+      // Delete them and create a new store with latest schema.
+      if (db.objectStoreNames.contains('workbox-precaching')) {
+        db.deleteObjectStore('workbox-precaching');
+      }
+      if (db.objectStoreNames.contains(DB_STORE_NAME)) {
+        db.deleteObjectStore(DB_STORE_NAME);
+      }
+    }
+    db.createObjectStore(DB_STORE_NAME);
+  }
+
+  /**
+   * Check if an entry is already cached. Returns false if
+   * the entry isn't cached or the revision has changed.
+   *
+   * @param {string} cacheName
+   * @param {PrecacheEntry} precacheEntry
+   * @return {boolean}
+   *
+   * @private
+   */
+  async _isEntryCached(cacheName, precacheEntry) {
+    const revisionDetails = await this._getRevision(precacheEntry._entryId);
+    if (revisionDetails !== precacheEntry._revision) {
+      return false;
+    }
+
+    const openCache = await caches.open(cacheName);
+    const cachedResponse = await openCache.match(precacheEntry._cacheRequest);
+    return !!cachedResponse;
+  }
+
+  /**
+   * @return {Promise<Array>}
+   *
+   * @private
+   */
+  async _getAllEntries() {
+    return await this._db.getAllMatching(DB_STORE_NAME, {
+      includeKeys: true,
+    });
+  }
+
+  /**
+   * Get the current revision details.
+   *
+   * @param {Object} entryId
+   * @return {Promise<string|null>}
+   *
+   * @private
+   */
+  async _getRevision(entryId) {
+    const data = await this._db.get(DB_STORE_NAME, entryId);
+    return data ? data[REVISON_IDB_FIELD] : null;
+  }
+
+  /**
+   * Add an entry to the details model.
+   *
+   * @param {PrecacheEntry} precacheEntry
+   *
+   * @private
+   */
+  async _addEntry(precacheEntry) {
+    await this._db.put(
+      DB_STORE_NAME,
+      {
+        [REVISON_IDB_FIELD]: precacheEntry._revision,
+        [URL_IDB_FIELD]: precacheEntry._cacheRequest.url,
+      },
+      precacheEntry._entryId
+    );
+  }
+
+  /**
+   * Delete entry from details model.
+   *
+   * @param {string} entryId
+   *
+   * @private
+   */
+  async _deleteEntry(entryId) {
+    await this._db.delete(DB_STORE_NAME, entryId);
+  }
+}
+
+export default PrecachedDetailsModel;