156 lines
3.6 KiB
JavaScript
156 lines
3.6 KiB
JavaScript
/**
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* Copyright 2015 Google Inc. All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// jshint node: true
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'use strict';
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let fs = require('fs');
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let path = require('path');
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let ResourceList = require('./listresources');
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/**
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* Map of file extension to request type.
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* See https://fetch.spec.whatwg.org/#concept-request-type
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* @const
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*/
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const EXTENSION_TO_TYPE = {
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'.css': 'style',
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'.gif': 'image',
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'.html': 'document',
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'.png': 'image',
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'.jpg': 'image',
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'.js': 'script',
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'.json': 'script',
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'.svg': 'image',
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'.webp': 'image',
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'.woff': 'font',
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'.woff2': 'font'
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};
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/**
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* JSON manifest for push resources.
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* @class
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*/
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class PushManifest {
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// Single file format:
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// {
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// "/style.css": {
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// "type": "style",
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// "weight": 50
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// },
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// "/path/to/app.js": {
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// "type": "script",
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// "weight": 10
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// }
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// }
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//
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// The multi-file format is a superset of the single case:
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// Multi-file format:
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// {
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// "/index.html": {
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// "/style.css": {
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// "type": "style",
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// "weight": 50
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// },
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// "/path/to/app.js"; {
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// "type": "script",
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// "weight": 10
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// }
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// },
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// "/page.html": {
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// ...
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// }
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// }
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// TODO: node 4.1.2 doesn't support default function args yet.
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constructor(opts) {
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opts = opts || {};
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this.name = opts.name || this.DEFAULT_MANIFEST_NAME;
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this.basePath = opts.basePath;
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this.inputPath = opts.inputPath;
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if (this.basePath && this.inputPath) {
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this.resourceList = new ResourceList(opts);
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}
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}
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get DEFAULT_MANIFEST_NAME() {
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return 'push_manifest.json';
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}
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get PUSH_PRIORITY() {
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return 1; // TODO: this gives every resource priority 1.
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}
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/**
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* Generates the JSON format listing the inputs resources.
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*
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* @return {Promise({urls, fileContent}) The list of urls and generated JSON.
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*/
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generate() {
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if (!this.resourceList) {
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console.warn('Cannot generate resources. You did not provide an inputPath/basePath.');
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}
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return this.resourceList.list().then(urls => {
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console.log(`Found ${urls.length} resource URLs in ${this.inputPath}:`);
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/* jshint ignore:start */
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for (let i = 0, url; url = urls[i]; ++i) {
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console.log(' ', url);
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}
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/* jshint ignore:end */
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let priorityMapping = {};
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urls.map((url, i) => {
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priorityMapping[url] = {
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weight: this.PUSH_PRIORITY
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};
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var type = EXTENSION_TO_TYPE[path.extname(url)];
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priorityMapping[url].type = type ? type : '';
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});
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this.fileContent = priorityMapping;
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// TODO: node 4.2.1 doesnt support ... spread operator.
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return {urls: urls, file: this.fileContent};
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});
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}
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/**
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* Writes the manifest.
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*
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* @param {Promise} Optional file content to write. By default, the content
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* from calling generate() is used.
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*/
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write(opt_fileContent) {
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let fileContent = opt_fileContent || this.fileContent;
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fs.writeFile(this.name, JSON.stringify(fileContent, null, 2), err => {
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if (err) {
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return console.log(err);
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}
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});
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}
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}
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module.exports = PushManifest;
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