Create index.js

index.js

@@ -0,0 +1,141 @@
+import express from 'express'
+import cors from 'cors'
+import fetch from 'node-fetch'
+
+const app = express()
+
+// Считываем ключ Helix из переменных окружения
+const HELIX_API_KEY = process.env.HELIX_API_KEY || ''
+
+// CORS
+app.use(cors({
+  origin: '*',
+  methods: ['GET', 'POST', 'OPTIONS'],
+  allowedHeaders: ['Content-Type', 'Authorization']
+}))
+app.use(express.json())
+app.options('*', (req, res) => res.sendStatus(204))
+
+// Список доступных моделей
+app.get(['/models', '/v1/models'], (req, res) => {
+  res.json({
+    object: 'list',
+    data: [
+      // OpenAI — GPT‑4.1 / 4.5
+      { id: 'gpt-4.1',                    object: 'model', created: 0, owned_by: 'helix' },
+      { id: 'gpt-4.1-2025-04-14',         object: 'model', created: 0, owned_by: 'helix' },
+      { id: 'gpt-4.1-mini',               object: 'model', created: 0, owned_by: 'helix' },
+      { id: 'gpt-4.1-mini-2025-04-14',    object: 'model', created: 0, owned_by: 'helix' },
+      { id: 'gpt-4.1-nano',               object: 'model', created: 0, owned_by: 'helix' },
+      { id: 'gpt-4.1-nano-2025-04-14',    object: 'model', created: 0, owned_by: 'helix' },
+      { id: 'gpt-4.5-preview',            object: 'model', created: 0, owned_by: 'helix' },
+      { id: 'gpt-4.5-preview-2025-02-27', object: 'model', created: 0, owned_by: 'helix' },
+
+      // OpenAI — GPT‑4o
+      { id: 'gpt-4o',                           object: 'model', created: 0, owned_by: 'helix' },
+      { id: 'gpt-4o-2024-05-13',                object: 'model', created: 0, owned_by: 'helix' },
+      { id: 'gpt-4o-2024-08-06',                object: 'model', created: 0, owned_by: 'helix' },
+      { id: 'gpt-4o-2024-11-20',                object: 'model', created: 0, owned_by: 'helix' },
+      { id: 'gpt-4o-mini',                      object: 'model', created: 0, owned_by: 'helix' },
+      { id: 'gpt-4o-mini-2024-07-18',           object: 'model', created: 0, owned_by: 'helix' },
+      { id: 'gpt-4o-search-preview',            object: 'model', created: 0, owned_by: 'helix' },
+      { id: 'gpt-4o-search-preview-2025-03-11', object: 'model', created: 0, owned_by: 'helix' },
+      { id: 'gpt-4o-mini-search-preview',       object: 'model', created: 0, owned_by: 'helix' },
+      { id: 'gpt-4o-mini-search-preview-2025-03-11', object: 'model', created: 0, owned_by: 'helix' },
+
+      // Helix — GPT‑3.5 Turbo
+      { id: 'gpt-3.5-turbo', object: 'model', created: 0, owned_by: 'helix' }
+    ]
+  })
+})
+
+// Прокси для /chat/completions
+app.post(['/chat/completions', '/v1/chat/completions'], async (req, res) => {
+  const {
+    model,
+    messages = [],
+    stream = false,
+    temperature,
+    top_p,
+    presence_penalty,
+    frequency_penalty,
+    ...rest
+  } = req.body
+
+  // Собираем историю, заменяя китайские префиксы на English
+  const historyText = messages
+    .map(m => (m.role === 'user' ? 'User: ' : 'Assistant: ') + m.content)
+    .join('\n')
+
+  // Формируем полезную нагрузку для Helix
+  const helixPayload = {
+    type: 'text',
+    stream,
+    provider: getProvider(model),
+    model,
+    messages: [
+      {
+        role: 'user',
+        content: { content_type: 'text', parts: [historyText] }
+      }
+    ],
+    temperature,
+    top_p,
+    presence_penalty,
+    frequency_penalty,
+    ...rest
+  }
+
+  // Заголовок авторизации для Helix
+  const authHeader = HELIX_API_KEY
+    ? `Bearer ${HELIX_API_KEY}`
+    : (req.header('authorization') || '')
+
+  // Отправляем запрос в Helix
+  const helixRes = await fetch(
+    'https://app.tryhelix.ai/api/v1/sessions/chat',
+    {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+        Authorization: authHeader
+      },
+      body: JSON.stringify(helixPayload)
+    }
+  )
+
+  if (!stream) {
+    const data = await helixRes.json()
+    const reply = data?.choices?.[0]?.message?.content ?? ''
+    return res.status(helixRes.status).json({
+      id: `chatcmpl-proxy-${data.id ?? Date.now()}`,
+      object: 'chat.completion',
+      created: Math.floor(Date.now() / 1000),
+      model,
+      choices: [
+        {
+          index: 0,
+          message: { role: 'assistant', content: reply },
+          finish_reason: 'stop'
+        }
+      ]
+    })
+  }
+
+  // При стриме прокидываем SSE напрямую
+  res.status(helixRes.status)
+  res.set('Content-Type', 'text/event-stream')
+  helixRes.body.pipe(res)
+})
+
+// Определяем провайдера по имени модели
+function getProvider(modelId) {
+  if (/^gpt-[34]|^gpt-3\.5/.test(modelId)) return 'openai'
+  if (/^(llama|phi|aya|gemma|deepseek|qwen)/.test(modelId)) return 'helix'
+  return 'togetherai'
+}
+
+const PORT = process.env.PORT || 7860
+app.listen(PORT, () => {
+  console.log(`🚀 Server listening on port ${PORT}`)
+})