| <!DOCTYPE html> |
| <!-- |
| This page: |
| 1. Waits for a message, and records the source. |
| 2. Requests media. |
| 3. Sends a message back to the source, telling it whether it was given media |
| access. |
| --> |
| <script> |
| function waitForSource() { |
| const {promise, resolve} = Promise.withResolvers(); |
| window.addEventListener('message', (e)=>{ |
| if (e.source) { |
| resolve(e.source); |
| } |
| }); |
| return promise; |
| } |
| |
| async function requestMedia() { |
| const {promise, resolve} = Promise.withResolvers(); |
| navigator.mediaDevices.getUserMedia({ audio: true }).then(()=>{ |
| resolve(true); |
| }).catch(err=>{ |
| resolve(false); |
| }); |
| return promise; |
| } |
| async function run() { |
| const source = await waitForSource(); |
| const granted = await requestMedia(); |
| source.postMessage({granted}, '*'); |
| } |
| |
| run(); |
| |
| </script> |
