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const handleRequest = async (request) => {
try {
const url = new URL(request.url);
let query;
let dropHeaders = false;
if (url.search.includes('&dh')) {
url.search = url.search.replace('&dh', '');
dropHeaders = true;
}
if (url.search.includes('?q=')) {
query = url.search.split('?q=')[1];
} else if (url.search.includes('?d=')) {
query = atob(url.search.split('?d=')[1]);
} else if (url.search.includes('?d2=')) {
const fullEncodedURL = url.search.split('?d2=')[1];
const key = parseInt(fullEncodedURL.slice(-2));
query = atob(fullEncodedURL.slice(0, -2))
.split(':')
.map((char) => String.fromCharCode(char - key))
.join('');
} else {
return new Response(null, {
status: 400,
statusText: 'Bad Request',
});
}
request = new Request(query, request);
request.headers.set('Host', new URL(query).origin);
request.headers.set('Referrer', new URL(query));
request.headers.set('Origin', new URL(query));
request.headers.set('Access-Control-Allow-Credentials', 'true');
request.headers.delete('X-Content-Type-Options');
let response = await fetch(request);
response = new Response(response.body, response);
if (dropHeaders) response.headers.forEach((_, key) => response.headers.delete(key));
response.headers.set('Access-Control-Allow-Origin', 'https://due.moe');
response.headers.append('Vary', 'Origin');
response.headers.set('Cache-Control', 'max-age=300');
return response;
} catch {
return new Response(null, {
status: 400,
statusText: 'Bad Request',
});
}
};
const handleOptions = async (request) => {
if (
request.headers.get('Origin') !== null &&
request.headers.get('Access-Control-Request-Method') !== null &&
request.headers.get('Access-Control-Request-Headers') !== null
) {
return new Response(null, {
headers: {
'Access-Control-Allow-Origin': '*',
'Access-Control-Allow-Methods': 'GET, HEAD, POST, OPTIONS',
'Access-Control-Allow-Headers': '*',
},
});
} else {
return new Response(null, {
headers: {
Allow: 'GET, HEAD, POST, OPTIONS',
},
});
}
};
addEventListener('fetch', (event) => {
const request = event.request;
try {
switch (request.method) {
case 'OPTIONS':
event.respondWith(handleOptions(request));
break;
case 'GET':
case 'HEAD':
case 'POST':
event.respondWith(handleRequest(request));
break;
default:
event.respondWith(async () => {
return new Response(null, {
status: 405,
statusText: 'Method Not Allowed',
});
});
break;
}
} catch {
return new Response(null, {
status: 400,
statusText: 'Bad Request',
});
}
});
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