Cloudflare Github Validation
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addEventListener('fetch', event => { | |
event.respondWith(handleRequest(event.request)) | |
}) | |
async function handleRequest(request) { | |
const ip = request.headers.get('cf-connecting-ip'); | |
const ghHeaders = new Headers(); | |
ghHeaders.append("User-agent", "Cloudflare") | |
response = await fetch('https://api.github.com/meta', {headers: ghHeaders}).then(function(response) { | |
return response.json() | |
}).then(async function(ranges) { | |
isValid = ranges.hooks.some(function(range) { | |
return validateIpRange(range, ip); | |
}) | |
if (isValid) { | |
response = await fetch(request); | |
return response; | |
} else { | |
return new Response("Access Denied - Not From Github", {status: 403}) | |
} | |
}) | |
return response; | |
} | |
function validateIpRange(cidrRange, ip) { | |
[network, mask] = cidrRange.split("/") | |
function convertIp(ipDottedQuad) { | |
octets = ipDottedQuad.split(".") | |
converted = (+octets[0]<<24) + (+octets[1]<<16) + (+octets[2]<<8) + (+octets[3]) | |
return converted; | |
} | |
function convertMask(mask) { | |
return -1<<(32-mask) | |
} | |
return (convertIp(ip) & convertMask(mask)) == convertIp(network) | |
} |
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