WIP - add extractor, generate snippet_data

node_modules/workbox-range-requests/Plugin.mjs

@@ -0,0 +1,52 @@
+/*
+ Copyright 2016 Google Inc. All Rights Reserved.
+ 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
+     http://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 {createPartialResponse} from './createPartialResponse.mjs';
+
+import './_version.mjs';
+
+/**
+ * The range request plugin makes it easy for a request with a 'Range' header to
+ * be fulfilled by a cached response.
+ *
+ * It does this by intercepting the `cachedResponseWillBeUsed` plugin callback
+ * and returning the appropriate subset of the cached response body.
+ *
+ * @memberof workbox.rangeRequests
+ */
+class Plugin {
+  /**
+   * @param {Object} options
+   * @param {Request} options.request The original request, which may or may not
+   * contain a Range: header.
+   * @param {Response} options.cachedResponse The complete cached response.
+   * @return {Promise<Response>} If request contains a 'Range' header, then a
+   * new response with status 206 whose body is a subset of `cachedResponse` is
+   * returned. Otherwise, `cachedResponse` is returned as-is.
+   *
+   * @private
+   */
+  async cachedResponseWillBeUsed({request, cachedResponse}) {
+    // Only return a sliced response if there's something valid in the cache,
+    // and there's a Range: header in the request.
+    if (cachedResponse && request.headers.has('range')) {
+      return await createPartialResponse(request, cachedResponse);
+    }
+
+    // If there was no Range: header, or if cachedResponse wasn't valid, just
+    // pass it through as-is.
+    return cachedResponse;
+  }
+}
+
+export {Plugin};