285 lines
7.6 KiB
JavaScript
285 lines
7.6 KiB
JavaScript
/**
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* persona-studio · 服务器端 AI 模型代理路由
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*
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* 目的：消除用户手动输入 API 密钥的需求
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* 所有模型调用由服务器端代理完成，API 密钥仅存在于服务器 .env
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*
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* 路由前缀：/api/ps/proxy
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*
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* 📜 Copyright: 国作登字-2026-A-00037559
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* 🔺 Sovereign: TCS-0002∞ | Root: SYS-GLW-0001
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*/
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const express = require('express');
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const router = express.Router();
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const https = require('https');
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const http = require('http');
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// 服务器端配置的模型 API
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const MODEL_API_KEY = process.env.MODEL_API_KEY || process.env.YUNWU_API_KEY || '';
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const MODEL_API_BASE = process.env.MODEL_API_BASE || 'https://api.yunwu.ai/v1';
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const DEFAULT_MODEL = process.env.DEFAULT_MODEL || 'gemini-2.0-flash';
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/**
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* 检查服务器端代理是否可用
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* GET /api/ps/proxy/status
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*/
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router.get('/status', (_req, res) => {
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const available = !!MODEL_API_KEY;
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res.json({
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error: false,
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proxy_available: available,
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model: available ? DEFAULT_MODEL : null,
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api_base: available ? MODEL_API_BASE : null,
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message: available
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? '服务器端代理可用 · 无需 API 密钥'
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: '服务器端代理未配置 · 请使用自有 API 密钥'
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});
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});
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/**
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* 获取服务器端可用模型列表
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* GET /api/ps/proxy/models
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*/
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router.get('/models', async (_req, res) => {
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if (!MODEL_API_KEY) {
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return res.status(503).json({
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error: true,
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code: 'PROXY_NOT_CONFIGURED',
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message: '服务器端 API 密钥未配置'
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});
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}
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try {
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const data = await callModelAPI('GET', '/models', null);
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const models = (data.data || []).map(m => m.id).filter(Boolean).sort();
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res.json({ error: false, models, api_base: MODEL_API_BASE });
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} catch (err) {
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res.status(502).json({
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error: true,
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code: 'MODEL_API_ERROR',
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message: '无法获取模型列表: ' + (err.message || 'Unknown error')
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});
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}
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});
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/**
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* 服务器端代理聊天
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* POST /api/ps/proxy/chat
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* Body: { messages: [...], model?: string, max_tokens?: number }
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*/
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router.post('/chat', async (req, res) => {
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if (!MODEL_API_KEY) {
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return res.status(503).json({
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error: true,
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code: 'PROXY_NOT_CONFIGURED',
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message: '服务器端 API 密钥未配置，请使用自有 API 密钥'
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});
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}
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const { messages, model, max_tokens } = req.body || {};
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if (!messages || !Array.isArray(messages) || messages.length === 0) {
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return res.status(400).json({
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error: true,
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code: 'INVALID_MESSAGES',
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message: '消息列表不能为空'
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});
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}
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// Validate message format
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for (const msg of messages) {
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if (!msg.role || !msg.content) {
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return res.status(400).json({
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error: true,
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code: 'INVALID_MESSAGE_FORMAT',
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message: '每条消息必须包含 role 和 content 字段'
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});
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}
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if (!['system', 'user', 'assistant'].includes(msg.role)) {
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return res.status(400).json({
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error: true,
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code: 'INVALID_ROLE',
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message: '消息 role 必须是 system/user/assistant'
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});
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}
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}
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try {
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const data = await callModelAPI('POST', '/chat/completions', {
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model: model || DEFAULT_MODEL,
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messages,
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max_tokens: Math.min(max_tokens || 4000, 8000),
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temperature: 0.3
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});
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if (data.choices && data.choices[0] && data.choices[0].message) {
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res.json({
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error: false,
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reply: data.choices[0].message.content,
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model: data.model || model || DEFAULT_MODEL,
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usage: data.usage || null
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});
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} else if (data.error) {
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res.status(502).json({
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error: true,
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code: 'MODEL_ERROR',
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message: data.error.message || '模型返回错误'
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});
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} else {
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res.status(502).json({
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error: true,
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code: 'UNEXPECTED_RESPONSE',
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message: '模型返回了意外格式的响应'
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});
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}
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} catch (err) {
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res.status(502).json({
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error: true,
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code: 'PROXY_ERROR',
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message: '服务器代理请求失败: ' + (err.message || 'Unknown error')
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});
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}
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});
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/**
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* 服务器端代理流式聊天（SSE）
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* POST /api/ps/proxy/chat/stream
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* Body: { messages: [...], model?: string, max_tokens?: number }
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*/
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router.post('/chat/stream', async (req, res) => {
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if (!MODEL_API_KEY) {
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return res.status(503).json({
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error: true,
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code: 'PROXY_NOT_CONFIGURED',
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message: '服务器端 API 密钥未配置'
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});
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}
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const { messages, model, max_tokens } = req.body || {};
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if (!messages || !Array.isArray(messages) || messages.length === 0) {
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return res.status(400).json({
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error: true,
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code: 'INVALID_MESSAGES',
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message: '消息列表不能为空'
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});
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}
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// Set SSE headers
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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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res.setHeader('X-Accel-Buffering', 'no');
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try {
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const base = MODEL_API_BASE.replace(/\/+$/, '');
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const chatUrl = new URL(base + '/chat/completions');
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const isHttps = chatUrl.protocol === 'https:';
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const mod = isHttps ? https : http;
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const body = JSON.stringify({
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model: model || DEFAULT_MODEL,
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messages,
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max_tokens: Math.min(max_tokens || 4000, 8000),
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temperature: 0.3,
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stream: true
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});
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const options = {
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hostname: chatUrl.hostname,
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port: chatUrl.port || (isHttps ? 443 : 80),
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path: chatUrl.pathname,
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method: 'POST',
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headers: {
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'Content-Type': 'application/json',
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'Authorization': 'Bearer ' + MODEL_API_KEY,
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'Content-Length': Buffer.byteLength(body)
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},
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timeout: 120000
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};
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const proxyReq = mod.request(options, (proxyRes) => {
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proxyRes.on('data', (chunk) => {
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res.write(chunk);
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});
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proxyRes.on('end', () => {
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res.end();
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});
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});
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proxyReq.on('error', (err) => {
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res.write('data: ' + JSON.stringify({ error: true, message: err.message }) + '\n\n');
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res.end();
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});
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proxyReq.on('timeout', () => {
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proxyReq.destroy();
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res.write('data: ' + JSON.stringify({ error: true, message: 'Request timeout' }) + '\n\n');
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res.end();
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});
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req.on('close', () => {
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proxyReq.destroy();
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});
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proxyReq.write(body);
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proxyReq.end();
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} catch (err) {
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res.write('data: ' + JSON.stringify({ error: true, message: err.message }) + '\n\n');
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res.end();
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}
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});
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/**
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* Helper: Call model API (non-streaming)
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*/
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function callModelAPI(method, endpoint, body) {
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return new Promise((resolve, reject) => {
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const base = MODEL_API_BASE.replace(/\/+$/, '');
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const url = new URL(base + endpoint);
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const isHttps = url.protocol === 'https:';
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const mod = isHttps ? https : http;
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const bodyStr = body ? JSON.stringify(body) : null;
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const options = {
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hostname: url.hostname,
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port: url.port || (isHttps ? 443 : 80),
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path: url.pathname,
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method,
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headers: {
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'Authorization': 'Bearer ' + MODEL_API_KEY,
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'Content-Type': 'application/json'
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},
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timeout: 60000
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};
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if (bodyStr) {
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options.headers['Content-Length'] = Buffer.byteLength(bodyStr);
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}
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const req = mod.request(options, (res) => {
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let data = '';
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res.on('data', (chunk) => { data += chunk; });
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res.on('end', () => {
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try {
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resolve(JSON.parse(data));
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} catch (_e) {
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reject(new Error('Failed to parse API response'));
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}
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});
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});
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req.on('error', reject);
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req.on('timeout', () => {
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req.destroy();
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reject(new Error('Request timeout'));
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});
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if (bodyStr) req.write(bodyStr);
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req.end();
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});
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}
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module.exports = router;
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