605 lines
19 KiB
JavaScript
605 lines
19 KiB
JavaScript
import express from 'express';
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import fetch from 'node-fetch';
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import { getConfig, getModelById, getEndpointByType, getSystemPrompt, getModelReasoning, getRedirectedModelId } from './config.js';
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import { logInfo, logDebug, logError, logRequest, logResponse } from './logger.js';
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import { transformToAnthropic, getAnthropicHeaders } from './transformers/request-anthropic.js';
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import { transformToOpenAI, getOpenAIHeaders } from './transformers/request-openai.js';
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import { transformToCommon, getCommonHeaders } from './transformers/request-common.js';
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import { AnthropicResponseTransformer } from './transformers/response-anthropic.js';
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import { OpenAIResponseTransformer } from './transformers/response-openai.js';
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import { getApiKey } from './auth.js';
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const router = express.Router();
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/**
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* Convert a /v1/responses API result to a /v1/chat/completions-compatible format.
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* Works for non-streaming responses.
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*/
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function convertResponseToChatCompletion(resp) {
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if (!resp || typeof resp !== 'object') {
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throw new Error('Invalid response object');
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}
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const outputMsg = (resp.output || []).find(o => o.type === 'message');
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const textBlocks = outputMsg?.content?.filter(c => c.type === 'output_text') || [];
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const content = textBlocks.map(c => c.text).join('');
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const chatCompletion = {
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id: resp.id ? resp.id.replace(/^resp_/, 'chatcmpl-') : `chatcmpl-${Date.now()}`,
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object: 'chat.completion',
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created: resp.created_at || Math.floor(Date.now() / 1000),
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model: resp.model || 'unknown-model',
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choices: [
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{
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index: 0,
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message: {
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role: outputMsg?.role || 'assistant',
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content: content || ''
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},
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finish_reason: resp.status === 'completed' ? 'stop' : 'unknown'
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}
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],
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usage: {
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prompt_tokens: resp.usage?.input_tokens ?? 0,
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completion_tokens: resp.usage?.output_tokens ?? 0,
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total_tokens: resp.usage?.total_tokens ?? 0
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}
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};
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return chatCompletion;
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}
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router.get('/v1/models', (req, res) => {
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logInfo('GET /v1/models');
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try {
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const config = getConfig();
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const models = config.models.map(model => ({
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id: model.id,
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object: 'model',
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created: Date.now(),
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owned_by: model.type,
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permission: [],
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root: model.id,
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parent: null
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}));
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const response = {
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object: 'list',
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data: models
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};
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logResponse(200, null, response);
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res.json(response);
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} catch (error) {
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logError('Error in GET /v1/models', error);
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res.status(500).json({ error: 'Internal server error' });
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}
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});
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// 标准 OpenAI 聊天补全处理函数（带格式转换）
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async function handleChatCompletions(req, res) {
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logInfo('POST /v1/chat/completions');
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try {
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const openaiRequest = req.body;
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const modelId = getRedirectedModelId(openaiRequest.model);
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if (!modelId) {
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return res.status(400).json({ error: 'model is required' });
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}
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const model = getModelById(modelId);
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if (!model) {
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return res.status(404).json({ error: `Model ${modelId} not found` });
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}
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const endpoint = getEndpointByType(model.type);
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if (!endpoint) {
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return res.status(500).json({ error: `Endpoint type ${model.type} not found` });
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}
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logInfo(`Routing to ${model.type} endpoint: ${endpoint.base_url}`);
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// Get API key (will auto-refresh if needed)
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let authHeader;
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try {
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authHeader = await getApiKey(req.headers.authorization);
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} catch (error) {
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logError('Failed to get API key', error);
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return res.status(500).json({
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error: 'API key not available',
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message: 'Failed to get or refresh API key. Please check server logs.'
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});
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}
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let transformedRequest;
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let headers;
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const clientHeaders = req.headers;
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// Log received client headers for debugging
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logDebug('Client headers received', {
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'x-factory-client': clientHeaders['x-factory-client'],
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'x-session-id': clientHeaders['x-session-id'],
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'x-assistant-message-id': clientHeaders['x-assistant-message-id'],
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'user-agent': clientHeaders['user-agent']
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});
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// Update request body with redirected model ID before transformation
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const requestWithRedirectedModel = { ...openaiRequest, model: modelId };
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if (model.type === 'anthropic') {
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transformedRequest = transformToAnthropic(requestWithRedirectedModel);
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const isStreaming = openaiRequest.stream === true;
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headers = getAnthropicHeaders(authHeader, clientHeaders, isStreaming, modelId);
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} else if (model.type === 'openai') {
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transformedRequest = transformToOpenAI(requestWithRedirectedModel);
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headers = getOpenAIHeaders(authHeader, clientHeaders);
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} else if (model.type === 'common') {
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transformedRequest = transformToCommon(requestWithRedirectedModel);
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headers = getCommonHeaders(authHeader, clientHeaders);
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} else {
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return res.status(500).json({ error: `Unknown endpoint type: ${model.type}` });
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}
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logRequest('POST', endpoint.base_url, headers, transformedRequest);
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const response = await fetch(endpoint.base_url, {
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method: 'POST',
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headers,
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body: JSON.stringify(transformedRequest)
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});
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logInfo(`Response status: ${response.status}`);
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if (!response.ok) {
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const errorText = await response.text();
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logError(`Endpoint error: ${response.status}`, new Error(errorText));
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return res.status(response.status).json({
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error: `Endpoint returned ${response.status}`,
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details: errorText
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});
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}
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const isStreaming = transformedRequest.stream === true;
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if (isStreaming) {
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res.setHeader('Content-Type', 'text/event-stream');
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res.setHeader('Cache-Control', 'no-cache');
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res.setHeader('Connection', 'keep-alive');
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// common 类型直接转发，不使用 transformer
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if (model.type === 'common') {
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try {
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for await (const chunk of response.body) {
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res.write(chunk);
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}
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res.end();
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logInfo('Stream forwarded (common type)');
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} catch (streamError) {
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logError('Stream error', streamError);
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res.end();
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}
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} else {
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// anthropic 和 openai 类型使用 transformer
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let transformer;
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if (model.type === 'anthropic') {
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transformer = new AnthropicResponseTransformer(modelId, `chatcmpl-${Date.now()}`);
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} else if (model.type === 'openai') {
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transformer = new OpenAIResponseTransformer(modelId, `chatcmpl-${Date.now()}`);
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}
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try {
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for await (const chunk of transformer.transformStream(response.body)) {
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res.write(chunk);
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}
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res.end();
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logInfo('Stream completed');
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} catch (streamError) {
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logError('Stream error', streamError);
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res.end();
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}
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}
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} else {
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const data = await response.json();
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if (model.type === 'openai') {
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try {
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const converted = convertResponseToChatCompletion(data);
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logResponse(200, null, converted);
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res.json(converted);
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} catch (e) {
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// 如果转换失败，回退为原始数据
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logResponse(200, null, data);
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res.json(data);
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}
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} else {
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// anthropic/common: 保持现有逻辑，直接转发
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logResponse(200, null, data);
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res.json(data);
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}
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}
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} catch (error) {
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logError('Error in /v1/chat/completions', error);
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res.status(500).json({
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error: 'Internal server error',
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message: error.message
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});
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}
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}
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// 直接转发 OpenAI 请求（不做格式转换）
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async function handleDirectResponses(req, res) {
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logInfo('POST /v1/responses');
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try {
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const openaiRequest = req.body;
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const modelId = getRedirectedModelId(openaiRequest.model);
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if (!modelId) {
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return res.status(400).json({ error: 'model is required' });
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}
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const model = getModelById(modelId);
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if (!model) {
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return res.status(404).json({ error: `Model ${modelId} not found` });
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}
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// 只允许 openai 类型端点
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if (model.type !== 'openai') {
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return res.status(400).json({
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error: 'Invalid endpoint type',
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message: `/v1/responses 接口只支持 openai 类型端点，当前模型 ${modelId} 是 ${model.type} 类型`
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});
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}
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const endpoint = getEndpointByType(model.type);
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if (!endpoint) {
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return res.status(500).json({ error: `Endpoint type ${model.type} not found` });
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}
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logInfo(`Direct forwarding to ${model.type} endpoint: ${endpoint.base_url}`);
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// Get API key - support client x-api-key for anthropic endpoint
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let authHeader;
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try {
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const clientAuthFromXApiKey = req.headers['x-api-key']
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? `Bearer ${req.headers['x-api-key']}`
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: null;
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authHeader = await getApiKey(req.headers.authorization || clientAuthFromXApiKey);
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} catch (error) {
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logError('Failed to get API key', error);
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return res.status(500).json({
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error: 'API key not available',
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message: 'Failed to get or refresh API key. Please check server logs.'
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});
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}
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const clientHeaders = req.headers;
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// 获取 headers
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const headers = getOpenAIHeaders(authHeader, clientHeaders);
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// 注入系统提示到 instructions 字段，并更新重定向后的模型ID
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const systemPrompt = getSystemPrompt();
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const modifiedRequest = { ...openaiRequest, model: modelId };
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if (systemPrompt) {
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// 如果已有 instructions，则在前面添加系统提示
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if (modifiedRequest.instructions) {
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modifiedRequest.instructions = systemPrompt + modifiedRequest.instructions;
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} else {
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// 否则直接设置系统提示
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modifiedRequest.instructions = systemPrompt;
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}
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}
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// 处理reasoning字段
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const reasoningLevel = getModelReasoning(modelId);
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if (reasoningLevel === 'auto') {
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// Auto模式：保持原始请求的reasoning字段不变
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// 如果原始请求有reasoning字段就保留，没有就不添加
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} else if (reasoningLevel && ['low', 'medium', 'high'].includes(reasoningLevel)) {
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modifiedRequest.reasoning = {
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effort: reasoningLevel,
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summary: 'auto'
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};
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} else {
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// 如果配置是off或无效，移除reasoning字段
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delete modifiedRequest.reasoning;
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}
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logRequest('POST', endpoint.base_url, headers, modifiedRequest);
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// 转发修改后的请求
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const response = await fetch(endpoint.base_url, {
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method: 'POST',
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headers,
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body: JSON.stringify(modifiedRequest)
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});
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logInfo(`Response status: ${response.status}`);
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if (!response.ok) {
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const errorText = await response.text();
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logError(`Endpoint error: ${response.status}`, new Error(errorText));
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return res.status(response.status).json({
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error: `Endpoint returned ${response.status}`,
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details: errorText
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});
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}
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const isStreaming = openaiRequest.stream === true;
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if (isStreaming) {
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// 直接转发流式响应，不做任何转换
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res.setHeader('Content-Type', 'text/event-stream');
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res.setHeader('Cache-Control', 'no-cache');
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res.setHeader('Connection', 'keep-alive');
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try {
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// 直接将原始响应流转发给客户端
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for await (const chunk of response.body) {
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res.write(chunk);
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}
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res.end();
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logInfo('Stream forwarded successfully');
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} catch (streamError) {
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logError('Stream error', streamError);
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res.end();
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}
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} else {
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// 直接转发非流式响应，不做任何转换
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const data = await response.json();
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logResponse(200, null, data);
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res.json(data);
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}
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} catch (error) {
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logError('Error in /v1/responses', error);
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res.status(500).json({
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error: 'Internal server error',
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message: error.message
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});
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}
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}
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// 直接转发 Anthropic 请求（不做格式转换）
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async function handleDirectMessages(req, res) {
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logInfo('POST /v1/messages');
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try {
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const anthropicRequest = req.body;
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const modelId = getRedirectedModelId(anthropicRequest.model);
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if (!modelId) {
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return res.status(400).json({ error: 'model is required' });
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}
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const model = getModelById(modelId);
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if (!model) {
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return res.status(404).json({ error: `Model ${modelId} not found` });
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}
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// 只允许 anthropic 类型端点
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if (model.type !== 'anthropic') {
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return res.status(400).json({
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error: 'Invalid endpoint type',
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message: `/v1/messages 接口只支持 anthropic 类型端点，当前模型 ${modelId} 是 ${model.type} 类型`
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});
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}
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const endpoint = getEndpointByType(model.type);
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if (!endpoint) {
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return res.status(500).json({ error: `Endpoint type ${model.type} not found` });
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}
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logInfo(`Direct forwarding to ${model.type} endpoint: ${endpoint.base_url}`);
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// Get API key - support client x-api-key for anthropic endpoint
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let authHeader;
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try {
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const clientAuthFromXApiKey = req.headers['x-api-key']
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? `Bearer ${req.headers['x-api-key']}`
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: null;
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authHeader = await getApiKey(req.headers.authorization || clientAuthFromXApiKey);
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} catch (error) {
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logError('Failed to get API key', error);
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return res.status(500).json({
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error: 'API key not available',
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message: 'Failed to get or refresh API key. Please check server logs.'
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});
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}
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const clientHeaders = req.headers;
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// 获取 headers
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const isStreaming = anthropicRequest.stream === true;
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const headers = getAnthropicHeaders(authHeader, clientHeaders, isStreaming, modelId);
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// 注入系统提示到 system 字段，并更新重定向后的模型ID
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const systemPrompt = getSystemPrompt();
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const modifiedRequest = { ...anthropicRequest, model: modelId };
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if (systemPrompt) {
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if (modifiedRequest.system && Array.isArray(modifiedRequest.system)) {
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// 如果已有 system 数组，则在最前面插入系统提示
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modifiedRequest.system = [
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{ type: 'text', text: systemPrompt },
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...modifiedRequest.system
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];
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} else {
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// 否则创建新的 system 数组
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modifiedRequest.system = [
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{ type: 'text', text: systemPrompt }
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];
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}
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}
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// 处理thinking字段
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const reasoningLevel = getModelReasoning(modelId);
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if (reasoningLevel === 'auto') {
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// Auto模式：保持原始请求的thinking字段不变
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// 如果原始请求有thinking字段就保留，没有就不添加
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} else if (reasoningLevel && ['low', 'medium', 'high'].includes(reasoningLevel)) {
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const budgetTokens = {
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'low': 4096,
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'medium': 12288,
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'high': 24576
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};
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modifiedRequest.thinking = {
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type: 'enabled',
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budget_tokens: budgetTokens[reasoningLevel]
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};
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} else {
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// 如果配置是off或无效，移除thinking字段
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delete modifiedRequest.thinking;
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}
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logRequest('POST', endpoint.base_url, headers, modifiedRequest);
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// 转发修改后的请求
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const response = await fetch(endpoint.base_url, {
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method: 'POST',
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headers,
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body: JSON.stringify(modifiedRequest)
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});
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logInfo(`Response status: ${response.status}`);
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if (!response.ok) {
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const errorText = await response.text();
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logError(`Endpoint error: ${response.status}`, new Error(errorText));
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return res.status(response.status).json({
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error: `Endpoint returned ${response.status}`,
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details: errorText
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});
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}
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if (isStreaming) {
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// 直接转发流式响应，不做任何转换
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res.setHeader('Content-Type', 'text/event-stream');
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res.setHeader('Cache-Control', 'no-cache');
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res.setHeader('Connection', 'keep-alive');
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try {
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// 直接将原始响应流转发给客户端
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for await (const chunk of response.body) {
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res.write(chunk);
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}
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res.end();
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logInfo('Stream forwarded successfully');
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} catch (streamError) {
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logError('Stream error', streamError);
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res.end();
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}
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} else {
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// 直接转发非流式响应，不做任何转换
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const data = await response.json();
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logResponse(200, null, data);
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res.json(data);
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}
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} catch (error) {
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logError('Error in /v1/messages', error);
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res.status(500).json({
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error: 'Internal server error',
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message: error.message
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});
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}
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}
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// 处理 Anthropic count_tokens 请求
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async function handleCountTokens(req, res) {
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logInfo('POST /v1/messages/count_tokens');
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try {
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const anthropicRequest = req.body;
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const modelId = getRedirectedModelId(anthropicRequest.model);
|
||
|
||
if (!modelId) {
|
||
return res.status(400).json({ error: 'model is required' });
|
||
}
|
||
|
||
const model = getModelById(modelId);
|
||
if (!model) {
|
||
return res.status(404).json({ error: `Model ${modelId} not found` });
|
||
}
|
||
|
||
// 只允许 anthropic 类型端点
|
||
if (model.type !== 'anthropic') {
|
||
return res.status(400).json({
|
||
error: 'Invalid endpoint type',
|
||
message: `/v1/messages/count_tokens 接口只支持 anthropic 类型端点，当前模型 ${modelId} 是 ${model.type} 类型`
|
||
});
|
||
}
|
||
|
||
const endpoint = getEndpointByType('anthropic');
|
||
if (!endpoint) {
|
||
return res.status(500).json({ error: 'Endpoint type anthropic not found' });
|
||
}
|
||
|
||
// Get API key
|
||
let authHeader;
|
||
try {
|
||
const clientAuthFromXApiKey = req.headers['x-api-key']
|
||
? `Bearer ${req.headers['x-api-key']}`
|
||
: null;
|
||
authHeader = await getApiKey(req.headers.authorization || clientAuthFromXApiKey);
|
||
} catch (error) {
|
||
logError('Failed to get API key', error);
|
||
return res.status(500).json({
|
||
error: 'API key not available',
|
||
message: 'Failed to get or refresh API key. Please check server logs.'
|
||
});
|
||
}
|
||
|
||
const clientHeaders = req.headers;
|
||
const headers = getAnthropicHeaders(authHeader, clientHeaders, false, modelId);
|
||
|
||
// 构建 count_tokens 端点 URL
|
||
const countTokensUrl = endpoint.base_url.replace('/v1/messages', '/v1/messages/count_tokens');
|
||
|
||
// 更新请求体中的模型ID为重定向后的ID
|
||
const modifiedRequest = { ...anthropicRequest, model: modelId };
|
||
|
||
logInfo(`Forwarding to count_tokens endpoint: ${countTokensUrl}`);
|
||
logRequest('POST', countTokensUrl, headers, modifiedRequest);
|
||
|
||
const response = await fetch(countTokensUrl, {
|
||
method: 'POST',
|
||
headers,
|
||
body: JSON.stringify(modifiedRequest)
|
||
});
|
||
|
||
logInfo(`Response status: ${response.status}`);
|
||
|
||
if (!response.ok) {
|
||
const errorText = await response.text();
|
||
logError(`Count tokens error: ${response.status}`, new Error(errorText));
|
||
return res.status(response.status).json({
|
||
error: `Endpoint returned ${response.status}`,
|
||
details: errorText
|
||
});
|
||
}
|
||
|
||
const data = await response.json();
|
||
logResponse(200, null, data);
|
||
res.json(data);
|
||
|
||
} catch (error) {
|
||
logError('Error in /v1/messages/count_tokens', error);
|
||
res.status(500).json({
|
||
error: 'Internal server error',
|
||
message: error.message
|
||
});
|
||
}
|
||
}
|
||
|
||
// 注册路由
|
||
router.post('/v1/chat/completions', handleChatCompletions);
|
||
router.post('/v1/responses', handleDirectResponses);
|
||
router.post('/v1/messages', handleDirectMessages);
|
||
router.post('/v1/messages/count_tokens', handleCountTokens);
|
||
|
||
export default router;
|