| const uid = require('../util/uid'); |
| const frameSource = require('./tw-load-script-as-plain-text!./tw-iframe-extension-worker-entry'); |
|
|
| const none = "'none'"; |
| const featurePolicy = { |
| 'accelerometer': none, |
| 'ambient-light-sensor': none, |
| 'battery': none, |
| 'camera': none, |
| 'display-capture': none, |
| 'document-domain': none, |
| 'encrypted-media': none, |
| 'fullscreen': none, |
| 'geolocation': none, |
| 'gyroscope': none, |
| 'magnetometer': none, |
| 'microphone': none, |
| 'midi': none, |
| 'payment': none, |
| 'picture-in-picture': none, |
| 'publickey-credentials-get': none, |
| 'speaker-selection': none, |
| 'usb': none, |
| 'vibrate': none, |
| 'vr': none, |
| 'screen-wake-lock': none, |
| 'web-share': none, |
| 'interest-cohort': none |
| }; |
|
|
| const generateAllow = () => Object.entries(featurePolicy) |
| .map(([name, permission]) => `${name} ${permission}`) |
| .join('; '); |
|
|
| class IframeExtensionWorker { |
| constructor () { |
| this.id = uid(); |
| this.isRemote = true; |
| this.ready = false; |
| this.queuedMessages = []; |
|
|
| this.iframe = document.createElement('iframe'); |
| this.iframe.className = 'tw-custom-extension-frame'; |
| this.iframe.dataset.id = this.id; |
| this.iframe.style.display = 'none'; |
| this.iframe.setAttribute('aria-hidden', 'true'); |
| this.iframe.sandbox = 'allow-scripts'; |
| this.iframe.allow = generateAllow(); |
| document.body.appendChild(this.iframe); |
|
|
| window.addEventListener('message', this._onWindowMessage.bind(this)); |
| const blob = new Blob([ |
| |
| `<!DOCTYPE html><body><script>window.__WRAPPED_IFRAME_ID__=${JSON.stringify(this.id)};${frameSource}</script></body>` |
| ], { |
| type: 'text/html; charset=utf-8' |
| }); |
| this.iframe.src = URL.createObjectURL(blob); |
| } |
|
|
| _onWindowMessage (e) { |
| if (!e.data || e.data.vmIframeId !== this.id) { |
| return; |
| } |
| if (e.data.ready) { |
| this.ready = true; |
| for (const {data, transfer} of this.queuedMessages) { |
| this.postMessage(data, transfer); |
| } |
| this.queuedMessages.length = 0; |
| } |
| if (e.data.message) { |
| this.onmessage({ |
| data: e.data.message |
| }); |
| } |
| } |
|
|
| onmessage () { |
| |
| } |
|
|
| postMessage (data, transfer) { |
| if (this.ready) { |
| if (transfer) { |
| this.iframe.contentWindow.postMessage(data, '*', transfer); |
| } else { |
| this.iframe.contentWindow.postMessage(data, '*'); |
| } |
| } else { |
| this.queuedMessages.push({data, transfer}); |
| } |
| } |
| } |
|
|
| module.exports = IframeExtensionWorker; |
|
|
