From 3f099943e9e19f93d4c6eedfcd2371d371cf1550 Mon Sep 17 00:00:00 2001 From: streetturtle Date: Tue, 25 Sep 2018 14:27:39 -0400 Subject: [PATCH] Create cache-polyfill.js --- assets/js/cache-polyfill.js | 78 +++++++++++++++++++++++++++++++++++++ 1 file changed, 78 insertions(+) create mode 100644 assets/js/cache-polyfill.js diff --git a/assets/js/cache-polyfill.js b/assets/js/cache-polyfill.js new file mode 100644 index 0000000..08718db --- /dev/null +++ b/assets/js/cache-polyfill.js @@ -0,0 +1,78 @@ +/** + * Copyright 2015 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. + * + */ + +if (!Cache.prototype.add) { + Cache.prototype.add = function add(request) { + return this.addAll([request]); + }; +} + +if (!Cache.prototype.addAll) { + Cache.prototype.addAll = function addAll(requests) { + var cache = this; + + // Since DOMExceptions are not constructable: + function NetworkError(message) { + this.name = 'NetworkError'; + this.code = 19; + this.message = message; + } + NetworkError.prototype = Object.create(Error.prototype); + + return Promise.resolve().then(function() { + if (arguments.length < 1) throw new TypeError(); + + // Simulate sequence<(Request or USVString)> binding: + var sequence = []; + + requests = requests.map(function(request) { + if (request instanceof Request) { + return request; + } + else { + return String(request); // may throw TypeError + } + }); + + return Promise.all( + requests.map(function(request) { + if (typeof request === 'string') { + request = new Request(request); + } + + var scheme = new URL(request.url).protocol; + + if (scheme !== 'http:' && scheme !== 'https:') { + throw new NetworkError("Invalid scheme"); + } + + return fetch(request.clone()); + }) + ); + }).then(function(responses) { + // TODO: check that requests don't overwrite one another + // (don't think this is possible to polyfill due to opaque responses) + return Promise.all( + responses.map(function(response, i) { + return cache.put(requests[i], response); + }) + ); + }).then(function() { + return undefined; + }); + }; +}