增加获取联系人信息接口

routes/user.js

@@ -1,5 +1,6 @@
 const express = require("express");
 const router = express.Router();
+const db = require("../db/mysql");
 const authMiddleware = require("../middleware/authMiddleware");
 
 
@@ -19,5 +20,52 @@ router.get(
     }
 );
 
+router.get(
+    "/contactInfo",
+    authMiddleware,
+    (req, res) => {         
+        const sql = `
+            SELECT
+                u.user_id,
+                u.username
+            FROM chat_mysql.contacts c
+            JOIN chat_mysql.users u
+                ON c.contact_id = u.user_id
+            WHERE c.user_id = ?;
+        `;
+        db.query(sql, [req.user.userId], (error, results) => {
+            if (error) {
+                console.error("数据库查询失败：", error);
+
+                return res.status(500).json({
+                    code: 500,
+                    message: "查询失败",
+                });
+            }
+            if (results.length > 0) {
+                res.json({
+                    code: 200,
+                    message: "查询成功",
+                    data: {
+                        contacts: results.map(contact => ({
+                            contactId: contact.user_id,
+                            contactName: contact.username
+                        }))
+                    },
+                });
+            } else {
+                res.json({
+                    code: 401,
+                    message: "未找到联系人",
+                    data: {
+                        contacts: []
+                    }
+                });
+            }
+        });
+
+    }
+);
+
 
 module.exports = router;