Created
January 4, 2023 13:30
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Prototype / Example worker for Cloudflare that pulls from R2
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| const corsHeaders = { | |
| 'Access-Control-Allow-Origin': '*', | |
| 'Access-Control-Allow-Methods': 'GET,HEAD,OPTIONS', | |
| 'Access-Control-Max-Age': '86400', | |
| }; | |
| async function handleRequest(request) { | |
| const url = new URL(request.url); | |
| const key = url.pathname.slice(1); | |
| const object = await R2.get(key); | |
| if (object === null) { | |
| return new Response('Object Not Found', { status: 404 }); | |
| } | |
| let respHeaders = { | |
| ...corsHeaders, | |
| // Allow all future content Request headers to go back to browser | |
| // such as Authorization (Bearer) or X-Client-Name-Version | |
| 'Access-Control-Allow-Headers': request.headers.get('Access-Control-Request-Headers'), | |
| 'etag': object.httpEtag | |
| }; | |
| return new Response(object.body, { | |
| headers: respHeaders, | |
| }); | |
| } | |
| function handleOptions(request) { | |
| // Make sure the necessary headers are present | |
| // for this to be a valid pre-flight request | |
| let headers = request.headers; | |
| if ( | |
| headers.get('Origin') !== null && | |
| headers.get('Access-Control-Request-Method') !== null && | |
| headers.get('Access-Control-Request-Headers') !== null | |
| ) { | |
| // Handle CORS pre-flight request. | |
| // If you want to check or reject the requested method + headers | |
| // you can do that here. | |
| let respHeaders = { | |
| ...corsHeaders, | |
| // Allow all future content Request headers to go back to browser | |
| // such as Authorization (Bearer) or X-Client-Name-Version | |
| 'Access-Control-Allow-Headers': request.headers.get('Access-Control-Request-Headers'), | |
| }; | |
| return new Response(null, { | |
| headers: respHeaders, | |
| }); | |
| } else { | |
| // Handle standard OPTIONS request. | |
| // If you want to allow other HTTP Methods, you can do that here. | |
| return new Response(null, { | |
| headers: { | |
| Allow: 'GET, HEAD, OPTIONS', | |
| }, | |
| }); | |
| } | |
| } | |
| addEventListener('fetch', event => { | |
| const request = event.request; | |
| const url = new URL(request.url); | |
| if (request.method === 'OPTIONS') { | |
| // Handle CORS preflight requests | |
| event.respondWith(handleOptions(request)); | |
| } else if (request.method === 'GET' || request.method === 'HEAD') { | |
| // Handle requests to the API server | |
| event.respondWith(handleRequest(request)); | |
| } else { | |
| event.respondWith( | |
| new Response(null, { | |
| status: 405, | |
| statusText: 'Method Not Allowed', | |
| }) | |
| ); | |
| } | |
| }); | |
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