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service-worker.js
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service-worker.js
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/*---------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
/**
* Root path for resources
*/
const resourceRoot = '/vscode-resource';
/**
* @template T
* @typedef {{
* resolve: (x: T) => void,
* promise: Promise<T>
* }} RequestStoreEntry
*/
/**
* @template T
*/
class RequestStore {
constructor() {
/** @type {Map<string, RequestStoreEntry<T>>} */
this.map = new Map();
}
/**
* @param {string} webviewId
* @param {string} path
* @return {RequestStoreEntry<T> | undefined}
*/
get(webviewId, path) {
return this.map.get(this._key(webviewId, path));
}
/**
* @param {string} webviewId
* @param {string} path
*/
create(webviewId, path) {
const existing = this.get(webviewId, path);
if (existing) {
return existing.promise;
}
let resolve;
const promise = new Promise(r => resolve = r);
this.map.set(this._key(webviewId, path), { resolve, promise });
return promise;
}
/**
* @param {string} webviewId
* @param {string} path
* @param {T} result
* @return {boolean}
*/
resolve(webviewId, path, result) {
const entry = this.get(webviewId, path);
if (!entry) {
return false;
}
entry.resolve(result);
return true;
}
/**
* @param {string} webviewId
* @param {string} path
* @return {string}
*/
_key(webviewId, path) {
return `${webviewId}@@@${path}`;
}
}
/**
* Map of requested paths to responses.
*
* @type {RequestStore<{ body: any, mime: string } | undefined>}
*/
const resourceRequestStore = new RequestStore();
/**
* Map of requested localhost origins to optional redirects.
*
* @type {RequestStore<string | undefined>}
*/
const localhostRequestStore = new RequestStore();
const notFoundResponse = new Response('Not Found', {
status: 404,
});
self.addEventListener('message', (event) => {
switch (event.data.channel) {
case 'did-load-resource':
{
const webviewId = getWebviewIdForClient(event.source);
const data = event.data.data;
const response = data.status === 200
? { body: data.data, mime: data.mime }
: undefined;
if (!resourceRequestStore.resolve(webviewId, data.path, response)) {
console.log('Could not resolve unknown resource', data.path);
}
return;
}
case 'did-load-localhost':
{
const webviewId = getWebviewIdForClient(event.source);
const data = event.data.data;
if (!localhostRequestStore.resolve(webviewId, data.origin, data.location)) {
console.log('Could not resolve unknown localhost', data.origin);
}
return;
}
}
console.log('Unknown message');
});
self.addEventListener('fetch', (event) => {
const requestUrl = new URL(event.request.url);
// See if it's a resource request
if (requestUrl.origin === self.origin && requestUrl.pathname.startsWith(resourceRoot + '/')) {
return event.respondWith(processResourceRequest(event, requestUrl));
}
// See if it's a localhost request
if (requestUrl.origin !== self.origin && requestUrl.host.match(/^localhost:(\d+)$/)) {
return event.respondWith(processLocalhostRequest(event, requestUrl));
}
});
self.addEventListener('install', (event) => {
event.waitUntil(self.skipWaiting()); // Activate worker immediately
});
self.addEventListener('activate', (event) => {
event.waitUntil(self.clients.claim()); // Become available to all pages
});
async function processResourceRequest(event, requestUrl) {
const client = await self.clients.get(event.clientId);
if (!client) {
console.log('Could not find inner client for request');
return notFoundResponse.clone();
}
const webviewId = getWebviewIdForClient(client);
const resourcePath = requestUrl.pathname.replace(resourceRoot, '');
function resolveResourceEntry(entry) {
if (!entry) {
return notFoundResponse.clone();
}
return new Response(entry.body, {
status: 200,
headers: { 'Content-Type': entry.mime }
});
}
const parentClient = await getOuterIframeClient(webviewId);
if (!parentClient) {
console.log('Could not find parent client for request');
return notFoundResponse.clone();
}
// Check if we've already resolved this request
const existing = resourceRequestStore.get(webviewId, resourcePath);
if (existing) {
return existing.promise.then(resolveResourceEntry);
}
parentClient.postMessage({
channel: 'load-resource',
path: resourcePath
});
return resourceRequestStore.create(webviewId, resourcePath)
.then(resolveResourceEntry);
}
/**
* @param {*} event
* @param {URL} requestUrl
*/
async function processLocalhostRequest(event, requestUrl) {
const client = await self.clients.get(event.clientId);
if (!client) {
// This is expected when requesting resources on other localhost ports
// that are not spawned by vs code
return undefined;
}
const webviewId = getWebviewIdForClient(client);
const origin = requestUrl.origin;
const resolveRedirect = redirectOrigin => {
if (!redirectOrigin) {
return fetch(event.request);
}
const location = event.request.url.replace(new RegExp(`^${requestUrl.origin}(/|$)`), `${redirectOrigin}$1`);
return new Response(null, {
status: 302,
headers: {
Location: location
}
});
};
const parentClient = await getOuterIframeClient(webviewId);
if (!parentClient) {
console.log('Could not find parent client for request');
return notFoundResponse.clone();
}
// Check if we've already resolved this request
const existing = localhostRequestStore.get(webviewId, origin);
if (existing) {
return existing.promise.then(resolveRedirect);
}
parentClient.postMessage({
channel: 'load-localhost',
origin: origin
});
return localhostRequestStore.create(webviewId, origin)
.then(resolveRedirect);
}
function getWebviewIdForClient(client) {
const requesterClientUrl = new URL(client.url);
return requesterClientUrl.search.match(/\bid=([a-z0-9-]+)/i)[1];
}
async function getOuterIframeClient(webviewId) {
const allClients = await self.clients.matchAll({ includeUncontrolled: true });
return allClients.find(client => {
const clientUrl = new URL(client.url);
return clientUrl.pathname === '/' && clientUrl.search.match(new RegExp('\\bid=' + webviewId));
});
}