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import { createServerAdapter } from '@whatwg-node/server';
import { AutoRouter, json, error, cors } from 'itty-router';
import { createServer } from 'http';
import dotenv from 'dotenv';
dotenv.config();
class Config {
constructor() {
this.PORT = process.env.PORT || 7860;
this.API_PREFIX = process.env.API_PREFIX || '/';
this.MAX_RETRY_COUNT = parseInt(process.env.MAX_RETRY_COUNT) || 3;
this.RETRY_DELAY = parseInt(process.env.RETRY_DELAY) || 5000;
this.FAKE_HEADERS = {
'Accept': 'application/json',
'Content-Type': 'application/json',
'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36',
'Referer': 'https://duckduckgo.com/',
'Origin': 'https://duckduckgo.com',
'x-vqd-accept': '1',
...JSON.parse(process.env.FAKE_HEADERS || '{}'),
};
}
}
const config = new Config();
const { preflight, corsify } = cors({
origin: '*',
allowMethods: '*',
exposeHeaders: '*',
});
const withBenchmarking = (request) => {
request.start = Date.now();
};
const getClientIP = (req) => {
return req.headers['x-forwarded-for']?.split(',')[0]?.trim() ||
req.headers['x-real-ip'] ||
req.socket?.remoteAddress ||
null;
};
const logger = (res, req) => {
console.log(req.method, res.status, req.url, Date.now() - req.start, 'ms');
};
const router = AutoRouter({
before: [withBenchmarking, preflight],
missing: () => error(404, '404 Not Found. Please check whether the calling URL is correct.'),
finally: [corsify, logger],
});
router.get('/', (req) => json({ message: 'API Service Running!' }));
router.get('/ping', (req) => json({ message: 'pong' }));
router.get(config.API_PREFIX + 'v1/models', (req) =>
json({
object: 'list',
data: [
{ id: 'gpt-4o-mini', object: 'model', owned_by: 'ddg' },
{ id: 'claude-3-haiku', object: 'model', owned_by: 'ddg' },
{ id: 'llama-3.1-70b', object: 'model', owned_by: 'ddg' },
{ id: 'mixtral-8x7b', object: 'model', owned_by: 'ddg' },
{ id: 'o3-mini', object: 'model', owned_by: 'ddg' },
],
})
);
router.post(config.API_PREFIX + 'v1/chat/completions', (req) => handleCompletion(req));
async function handleCompletion(request) {
try {
const { model: inputModel, messages, stream: returnStream } = await request.json();
const model = convertModel(inputModel);
const content = messagesPrepare(messages);
const clientIp = getClientIP(request);
return createCompletion(model, content, returnStream, clientIp);
} catch (err) {
console.error('Handle Completion Error:', err);
return error(500, err.message);
}
}
async function createCompletion(model, content, returnStream, clientIp, retryCount = 0) {
try {
const token = await requestToken(clientIp);
const response = await fetch('https://duckduckgo.com/duckchat/v1/chat', {
method: 'POST',
headers: {
...config.FAKE_HEADERS,
'x-vqd-4': token,
...(clientIp ? { 'x-forwarded-for': clientIp } : {}),
},
body: JSON.stringify({
model,
messages: [{ role: 'user', content }],
}),
});
if (!response.ok) {
if (response.status === 418) {
console.warn('Rate limit hit (418), retrying...');
throw new Error('Rate limit exceeded');
}
throw new Error(`Create Completion error! status: ${response.status}, message: ${await response.text()}`);
}
return handlerStream(model, response.body, returnStream);
} catch (err) {
console.error('Create Completion Error:', err.message);
if (retryCount < config.MAX_RETRY_COUNT && (err.message.includes('Rate limit') || err.message.includes('418'))) {
console.log('Retrying... count', ++retryCount);
await new Promise((resolve) => setTimeout(resolve, config.RETRY_DELAY));
return createCompletion(model, content, returnStream, clientIp, retryCount);
}
throw err;
}
}
async function handlerStream(model, body, returnStream) {
const reader = body.getReader();
const decoder = new TextDecoder();
const encoder = new TextEncoder();
let previousText = '';
const stream = new ReadableStream({
async start(controller) {
while (true) {
const { done, value } = await reader.read();
if (done) {
if (!returnStream) {
controller.enqueue(encoder.encode(JSON.stringify(newChatCompletionWithModel(previousText, model))));
}
return controller.close();
}
const chunk = decoder.decode(value).trim();
const lines = chunk.split('\n').filter((line) => line.startsWith('data: '));
for (const line of lines) {
const data = line.slice(6);
if (data === '[DONE]') {
if (returnStream) {
controller.enqueue(encoder.encode(`data: ${JSON.stringify(newStopChunkWithModel('stop', model))}\n\n`));
}
return controller.close();
}
try {
const parsed = JSON.parse(data);
if (parsed.message) {
previousText += parsed.message;
if (returnStream) {
controller.enqueue(
encoder.encode(`data: ${JSON.stringify(newChatCompletionChunkWithModel(parsed.message, model))}\n\n`)
);
}
}
} catch (err) {
console.error('Stream parse error:', err);
}
}
}
},
});
return new Response(stream, {
headers: {
'Content-Type': returnStream ? 'text/event-stream' : 'application/json',
'Cache-Control': 'no-cache',
'Connection': 'keep-alive',
},
});
}
function messagesPrepare(messages) {
return messages
.filter((msg) => ['user', 'assistant'].includes(msg.role))
.map((msg) => msg.content)
.join('\n');
}
async function requestToken(clientIp) {
try {
const response = await fetch('https://duckduckgo.com/duckchat/v1/status', {
method: 'GET',
headers: {
...config.FAKE_HEADERS,
...(clientIp ? { 'x-forwarded-for': clientIp } : {}),
},
});
if (!response.ok) {
throw new Error('Request Token failed!');
}
const data = await response.json();
return data?.vqd;
} catch (err) {
console.error('Request Token Error:', err);
throw err;
}
}
function convertModel(model) {
return model; // Adjust if needed
}
function newChatCompletionWithModel(content, model) {
return {
id: 'chatcmpl-' + Date.now(),
object: 'chat.completion',
created: Math.floor(Date.now() / 1000),
model,
choices: [
{
index: 0,
message: { role: 'assistant', content },
finish_reason: 'stop',
},
],
};
}
function newChatCompletionChunkWithModel(content, model) {
return {
id: 'chatcmpl-' + Date.now(),
object: 'chat.completion.chunk',
created: Math.floor(Date.now() / 1000),
model,
choices: [
{
delta: { content },
index: 0,
finish_reason: null,
},
],
};
}
function newStopChunkWithModel(reason, model) {
return {
id: 'chatcmpl-' + Date.now(),
object: 'chat.completion.chunk',
created: Math.floor(Date.now() / 1000),
model,
choices: [
{
delta: {},
index: 0,
finish_reason: reason,
},
],
};
}
// Create Server
createServer(createServerAdapter(router.fetch)).listen(config.PORT, () => {
console.log('Server running at http://localhost:' + config.PORT);
});
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