/** * Copyright (c) Microsoft Corporation. * * 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 * as http from 'http'; import querystring from 'querystring'; import { HttpServer } from '../../utils/httpServer'; import type { RenderedFrameSnapshot } from './snapshotTypes'; import { SnapshotStorage } from './snapshotStorage'; import type { Point } from '../../common/types'; export class SnapshotServer { private _snapshotStorage: SnapshotStorage; constructor(server: HttpServer, snapshotStorage: SnapshotStorage) { this._snapshotStorage = snapshotStorage; server.routePrefix('/snapshot/', this._serveSnapshot.bind(this)); server.routePrefix('/resources/', this._serveResource.bind(this)); } private _serveSnapshotRoot(request: http.IncomingMessage, response: http.ServerResponse): boolean { response.statusCode = 200; response.setHeader('Cache-Control', 'public, max-age=31536000'); response.setHeader('Content-Type', 'text/html'); response.end(` `); return true; } private _serveServiceWorker(request: http.IncomingMessage, response: http.ServerResponse): boolean { function serviceWorkerMain(self: any /* ServiceWorkerGlobalScope */) { const snapshotResources = new Map(); self.addEventListener('install', function(event: any) { }); self.addEventListener('activate', function(event: any) { event.waitUntil(self.clients.claim()); }); function respond404(): Response { return new Response(null, { status: 404 }); } function respondNotAvailable(): Response { return new Response('', { status: 200, headers: { 'Content-Type': 'text/html' } }); } function removeHash(url: string) { try { const u = new URL(url); u.hash = ''; return u.toString(); } catch (e) { return url; } } async function doFetch(event: any /* FetchEvent */): Promise { const request = event.request; const pathname = new URL(request.url).pathname; if (pathname === '/snapshot/service-worker.js' || pathname === '/snapshot/') return fetch(event.request); const snapshotUrl = request.mode === 'navigate' ? request.url : (await self.clients.get(event.clientId))!.url; if (request.mode === 'navigate') { const htmlResponse = await fetch(event.request); const { html, resources }: RenderedFrameSnapshot = await htmlResponse.json(); if (!html) return respondNotAvailable(); snapshotResources.set(snapshotUrl, resources); const response = new Response(html, { status: 200, headers: { 'Content-Type': 'text/html' } }); return response; } const resources = snapshotResources.get(snapshotUrl)!; const urlWithoutHash = removeHash(request.url); const resource = resources[urlWithoutHash]; if (!resource) return respond404(); const fetchUrl = resource.sha1 ? `/resources/${resource.resourceId}/override/${resource.sha1}` : `/resources/${resource.resourceId}`; const fetchedResponse = await fetch(fetchUrl); const headers = new Headers(fetchedResponse.headers); // We make a copy of the response, instead of just forwarding, // so that response url is not inherited as "/resources/...", but instead // as the original request url. // Response url turns into resource base uri that is used to resolve // relative links, e.g. url(/foo/bar) in style sheets. if (resource.sha1) { // No cache, so that we refetch overridden resources. headers.set('Cache-Control', 'no-cache'); } const response = new Response(fetchedResponse.body, { status: fetchedResponse.status, statusText: fetchedResponse.statusText, headers, }); return response; } self.addEventListener('fetch', function(event: any) { event.respondWith(doFetch(event)); }); } response.statusCode = 200; response.setHeader('Cache-Control', 'public, max-age=31536000'); response.setHeader('Content-Type', 'application/javascript'); response.end(`(${serviceWorkerMain.toString()})(self)`); return true; } private _serveSnapshot(request: http.IncomingMessage, response: http.ServerResponse): boolean { if (request.url!.endsWith('/snapshot/')) return this._serveSnapshotRoot(request, response); if (request.url!.endsWith('/snapshot/service-worker.js')) return this._serveServiceWorker(request, response); response.statusCode = 200; response.setHeader('Cache-Control', 'public, max-age=31536000'); response.setHeader('Content-Type', 'application/json'); const [ pageOrFrameId, query ] = request.url!.substring('/snapshot/'.length).split('?'); const parsed: any = querystring.parse(query); const snapshot = this._snapshotStorage.snapshotByName(pageOrFrameId, parsed.name); const snapshotData: any = snapshot ? snapshot.render() : { html: '' }; response.end(JSON.stringify(snapshotData)); return true; } private _serveResource(request: http.IncomingMessage, response: http.ServerResponse): boolean { // - /resources/ // - /resources//override/ const parts = request.url!.split('/'); if (!parts[0]) parts.shift(); if (!parts[parts.length - 1]) parts.pop(); if (parts[0] !== 'resources') return false; let resourceId; let overrideSha1; if (parts.length === 2) { resourceId = parts[1]; } else if (parts.length === 4 && parts[2] === 'override') { resourceId = parts[1]; overrideSha1 = parts[3]; } else { return false; } const resource = this._snapshotStorage.resourceById(resourceId); if (!resource) return false; const sha1 = overrideSha1 || resource.responseSha1; try { const content = this._snapshotStorage.resourceContent(sha1); if (!content) return false; response.statusCode = 200; let contentType = resource.contentType; const isTextEncoding = /^text\/|^application\/(javascript|json)/.test(contentType); if (isTextEncoding && !contentType.includes('charset')) contentType = `${contentType}; charset=utf-8`; response.setHeader('Content-Type', contentType); for (const { name, value } of resource.responseHeaders) response.setHeader(name, value); response.removeHeader('Content-Encoding'); response.removeHeader('Access-Control-Allow-Origin'); response.setHeader('Access-Control-Allow-Origin', '*'); response.removeHeader('Content-Length'); response.setHeader('Content-Length', content.byteLength); response.setHeader('Cache-Control', 'public, max-age=31536000'); response.end(content); return true; } catch (e) { return false; } } } declare global { interface Window { showSnapshot: (url: string, point?: Point) => Promise; } } function rootScript() { if (!navigator.serviceWorker) return; navigator.serviceWorker.register('./service-worker.js'); let showPromise = Promise.resolve(); if (!navigator.serviceWorker.controller) { showPromise = new Promise(resolve => { navigator.serviceWorker.oncontrollerchange = () => resolve(); }); } const pointElement = document.createElement('div'); pointElement.style.position = 'fixed'; pointElement.style.backgroundColor = 'red'; pointElement.style.width = '20px'; pointElement.style.height = '20px'; pointElement.style.borderRadius = '10px'; pointElement.style.margin = '-10px 0 0 -10px'; pointElement.style.zIndex = '2147483647'; let current = document.createElement('iframe'); document.body.appendChild(current); let next = document.createElement('iframe'); document.body.appendChild(next); next.style.visibility = 'hidden'; const onload = () => { const temp = current; current = next; next = temp; current.style.visibility = 'visible'; next.style.visibility = 'hidden'; }; current.onload = onload; next.onload = onload; (window as any).showSnapshot = async (url: string, options: { point?: Point } = {}) => { await showPromise; next.src = url; if (options.point) { pointElement.style.left = options.point.x + 'px'; pointElement.style.top = options.point.y + 'px'; document.documentElement.appendChild(pointElement); } else { pointElement.remove(); } }; window.addEventListener('message', event => { window.showSnapshot(window.location.href + event.data.snapshotUrl); }, false); }