@dodona/papyros
Version:
Scratchpad for multiple programming languages in the browser.
63 lines • 3 kB
JavaScript
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
import { serviceWorkerFetchListener } from "sync-message";
/**
* Class that is used in a service worker to allow synchronous communication
* between threads. This is achieved in two different ways.
* Responses can be modified by attaching headers allowing the use of shared memory.
* Requests to certain endpoints can be used with synchronous requests
* to achieve the same goal.
*/
export class InputWorker {
/**
* Create a worker for a specific domain
* @param {string} hostName Optional name of the host domain
*/
constructor(hostName = "") {
this.hostName = hostName;
this.syncMessageListener = serviceWorkerFetchListener();
}
/**
* Process and potentially handle a fetch request from the application
* @param {FetchEvent} event The event denoting a request to a url
* @return {boolean} Whether the event was handled
*/
handleInputRequest(event) {
return __awaiter(this, void 0, void 0, function* () {
// Special requests targeted at getting input from the user
if (this.syncMessageListener(event)) {
return true;
}
const url = event.request.url;
if (this.hostName && url.includes(this.hostName)) { // requests to our own domain
event.respondWith(fetch(event.request)
.then(response => {
// Add new headers to be able to use SharedArrayBuffers
// if the browser supports them
const newHeaders = new Headers(response.headers);
newHeaders.set("Cross-Origin-Embedder-Policy", "require-corp");
newHeaders.set("Cross-Origin-Opener-Policy", "same-origin");
newHeaders.set("Cross-Origin-Resource-Policy", "cross-origin");
const moddedResponse = new Response(response.body, {
status: response.status || 200,
statusText: response.statusText,
headers: newHeaders,
});
return moddedResponse;
}));
return true;
}
else {
return false;
}
});
}
}
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