init: 初始化demo项目,新增deepseek和千问api调用demo;

platforms/qwen/router.js

@@ -0,0 +1,167 @@
+const express = require("express");
+
+const router = express.Router();
+
+const QWEN_API_KEY = process.env.QWEN_API_KEY;
+const QWEN_MODEL = process.env.QWEN_MODEL || "qwen-plus";
+const QWEN_BASE_URL =
+  process.env.QWEN_BASE_URL ||
+  "https://dashscope.aliyuncs.com/compatible-mode/v1";
+
+router.post("/chat", async (req, res) => {
+  try {
+    if (!QWEN_API_KEY) {
+      return res.status(500).json({
+        error: "缺少 QWEN_API_KEY，请先在 .env 中配置",
+      });
+    }
+
+    const { messages, model, temperature } = req.body || {};
+    if (!Array.isArray(messages) || messages.length === 0) {
+      return res.status(400).json({
+        error: "请求体 messages 必须是非空数组",
+      });
+    }
+
+    const response = await fetch(`${QWEN_BASE_URL}/chat/completions`, {
+      method: "POST",
+      headers: {
+        "Content-Type": "application/json",
+        Authorization: `Bearer ${QWEN_API_KEY}`,
+      },
+      body: JSON.stringify({
+        model: model || QWEN_MODEL,
+        messages,
+        temperature: typeof temperature === "number" ? temperature : 0.7,
+      }),
+    });
+
+    const data = await response.json();
+    if (!response.ok) {
+      return res.status(response.status).json({
+        error: "调用千问失败",
+        detail: data,
+      });
+    }
+
+    return res.json({
+      id: data.id,
+      model: data.model,
+      content: data?.choices?.[0]?.message?.content || "",
+      raw: data,
+    });
+  } catch (error) {
+    return res.status(500).json({
+      error: "服务内部错误",
+      detail: error.message,
+    });
+  }
+});
+
+router.post("/chat/stream", async (req, res) => {
+  try {
+    if (!QWEN_API_KEY) {
+      return res.status(500).json({
+        error: "缺少 QWEN_API_KEY，请先在 .env 中配置",
+      });
+    }
+
+    const { messages, model, temperature } = req.body || {};
+    if (!Array.isArray(messages) || messages.length === 0) {
+      return res.status(400).json({
+        error: "请求体 messages 必须是非空数组",
+      });
+    }
+
+    res.setHeader("Content-Type", "text/event-stream; charset=utf-8");
+    res.setHeader("Cache-Control", "no-cache, no-transform");
+    res.setHeader("Connection", "keep-alive");
+    res.flushHeaders();
+
+    const controller = new AbortController();
+    req.on("close", () => {
+      controller.abort();
+    });
+
+    const response = await fetch(`${QWEN_BASE_URL}/chat/completions`, {
+      method: "POST",
+      headers: {
+        "Content-Type": "application/json",
+        Authorization: `Bearer ${QWEN_API_KEY}`,
+      },
+      body: JSON.stringify({
+        model: model || QWEN_MODEL,
+        messages,
+        temperature: typeof temperature === "number" ? temperature : 0.7,
+        stream: true,
+      }),
+      signal: controller.signal,
+    });
+
+    if (!response.ok) {
+      const errorData = await response.json().catch(() => ({}));
+      res.write(
+        `data: ${JSON.stringify({
+          error: "调用千问流式接口失败",
+          detail: errorData,
+        })}\n\n`,
+      );
+      return res.end();
+    }
+
+    if (!response.body) {
+      res.write(`data: ${JSON.stringify({ error: "未获取到流式响应体" })}\n\n`);
+      return res.end();
+    }
+
+    const reader = response.body.getReader();
+    const decoder = new TextDecoder("utf-8");
+    let buffer = "";
+
+    while (true) {
+      const { done, value } = await reader.read();
+      if (done) break;
+
+      buffer += decoder.decode(value, { stream: true });
+      const lines = buffer.split("\n");
+      buffer = lines.pop() || "";
+
+      for (const line of lines) {
+        const trimmed = line.trim();
+        if (!trimmed.startsWith("data:")) continue;
+
+        const payload = trimmed.slice(5).trim();
+        if (payload === "[DONE]") {
+          res.write("data: [DONE]\n\n");
+          res.end();
+          return;
+        }
+
+        try {
+          const parsed = JSON.parse(payload);
+          const delta = parsed?.choices?.[0]?.delta?.content;
+          if (delta) {
+            res.write(`data: ${JSON.stringify({ delta })}\n\n`);
+          }
+        } catch (_error) {
+          // 忽略非 JSON 片段，继续解析后续流内容
+        }
+      }
+    }
+
+    res.write("data: [DONE]\n\n");
+    return res.end();
+  } catch (error) {
+    if (!res.headersSent) {
+      return res.status(500).json({
+        error: "服务内部错误",
+        detail: error.message,
+      });
+    }
+
+    res.write(`data: ${JSON.stringify({ error: error.message })}\n\n`);
+    return res.end();
+  }
+});
+
+module.exports = router;