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November 30, 2018 14:08
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Proxy all fetch request using a service worker to prevent unwanted urls
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| <html> | |
| <head> | |
| <script> | |
| if ('serviceWorker' in navigator) { | |
| window.addEventListener('load', function() { | |
| console.log('[APP] registering ServiceWorker') | |
| navigator.serviceWorker.register('/sw.js').then(function(registration) { | |
| // Registration was successful | |
| console.log('[APP] ServiceWorker registration successful with scope: ', registration.scope); | |
| }, function(err) { | |
| // registration failed :( | |
| console.log('[APP] ServiceWorker registration failed: ', err); | |
| }); | |
| }); | |
| } | |
| </script> | |
| </head> | |
| <body> | |
| <h1>Hi there</h1> | |
| <img src="https://www.nasa.gov/sites/default/files/thumbnails/image/nasa-logo-web-rgb.png"/> | |
| </body> | |
| </html> |
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| const ALLOWED_DOMAINS = [ | |
| 'localhost', | |
| 'www.nasa.gov', // commenting this will prevent the img from being loaded | |
| ] | |
| const log = message => console.log("[SERVICE WORKER]: " + message) | |
| self.addEventListener('fetch', function(event) { | |
| const request_url = new URL(event.request.url) | |
| log(request_url) | |
| if(!ALLOWED_DOMAINS.includes(request_url.hostname)) { | |
| event.respondWith(new Response('', { | |
| status: 403, | |
| statusText: `This domain ${request_url.hostname} is not allowed`, | |
| })) | |
| } | |
| }); |
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Just wondering if ☝️ is bulletproof? Or can it still be deregistered or removed by loading a malicious script in
index.html?