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Cloudflare Worker - Link Shortener
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| <!doctype html> | |
| <html lang="en"> | |
| <head> | |
| <!-- Required meta tags --> | |
| <meta charset="utf-8"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"> | |
| <!-- Bootstrap CSS --> | |
| <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous"> | |
| <title>Hello, world!</title> | |
| </head> | |
| <body> | |
| <h1>Cloudflare Workers Link Shortener</h1> | |
| <h2>Create a Link</h2> | |
| <pre>$ curl https://l.obez.uk/?new=https://cloudflare.com</pre> | |
| <!-- Optional JavaScript --> | |
| <!-- jQuery first, then Popper.js, then Bootstrap JS --> | |
| <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script> | |
| <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script> | |
| </body> | |
| </html> |
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| addEventListener('fetch', event => { | |
| event.respondWith(handleRequest(event.request)) | |
| }) | |
| async function generate_rand(i) { // recursively fetch randon values incase there is a collision | |
| if (typeof i == 'undefined') { | |
| i = 0; | |
| } | |
| if (i >= 5) { | |
| throw new Error('Limiting random key checks to 5'); | |
| } | |
| try { | |
| var rand_response = await fetch(new Request('https://csprng.xyz/v1/api?length=6')); | |
| var rand = await rand_response.json(); | |
| var random_data = rand.Data; | |
| var exists = await WORKERS_KV_LINKS.get(random_data); | |
| if (exists) { | |
| throw new Error('Collision!'); | |
| } else { | |
| return random_data; | |
| } | |
| } catch(e) { | |
| i++; | |
| return await generate_rand(i); | |
| } | |
| } | |
| async function handleRequest(request) { | |
| var request_url = new URL(request.url); | |
| short_url = request_url.pathname.split('/'); | |
| if (short_url[1]) { | |
| var input = ''; | |
| if (short_url.length > 1) { | |
| short_url.shift(); | |
| input = short_url.join('/'); | |
| } else { | |
| input = short_url[1]; | |
| } | |
| var url = await WORKERS_KV_LINKS.get(input); | |
| if (url) { | |
| var requested_url = new URL(url); | |
| return Response.redirect(requested_url.toString(), 301); | |
| } else { | |
| return new Response(JSON.stringify({ | |
| "Status" : 404, | |
| "Message" : 'Short url not found', | |
| "ShortUrl" : null | |
| }), { | |
| 'status': 404, | |
| 'statusText': 'Not found', | |
| 'headers': { "Content-Type": "application/json" } | |
| }); | |
| } | |
| } else { | |
| if (request_url.searchParams.get('new')) { | |
| try { | |
| var new_url = new URL(request_url.searchParams.get('new')); | |
| var rand_response = await fetch(new Request('https://csprng.xyz/v1/api?length=6')); | |
| var rand = await rand_response.json() | |
| try { | |
| var randomKey = await generate_rand(); | |
| } catch(e) { | |
| return new Response(JSON.stringify({ | |
| "Status" : 500, | |
| "Message" : e.message, | |
| "ShortUrl" : null | |
| }), { | |
| 'status': 500, | |
| 'statusText': 'Server error', | |
| 'headers': { "Content-Type": "application/json" } | |
| }); | |
| } | |
| var y = await WORKERS_KV_LINKS.put(randomKey, new_url.toString()); | |
| var short_url = request_url.protocol + '//' + request_url.hostname + '/' + randomKey; | |
| return new Response(JSON.stringify({ | |
| "Status" : 200, | |
| "Message" : "Successfully created new link", | |
| "ShortUrl" : short_url | |
| }), { | |
| 'headers': { "Content-Type": "application/json" } | |
| }); | |
| } catch (e) { | |
| return new Response(JSON.stringify({ | |
| "Status" : 400, | |
| "Message" : e.message, | |
| "ShortUrl" : null | |
| }), { | |
| 'status': 400, | |
| 'statusText': 'Bad Request', | |
| 'headers': { "Content-Type": "application/json" } | |
| }); | |
| } | |
| } else { | |
| var info = ''; | |
| info = info + '<h1>Cloudflare Workers Link Shortener</h1>'; | |
| info = info + '<h2>Create a link</h2>'; | |
| info = info + '<pre>$ curl ' + request_url.protocol + '//' + request_url.hostname + '/?new=https://cloudflare.com</pre>'; | |
| return new Response(info, { | |
| 'headers': { "Content-Type": "text/html" } | |
| }); | |
| } | |
| } | |
| } |
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