feat(backup): 实现自动备份功能及错误边界处理

backend/initConfig.js

@@ -0,0 +1,107 @@
+const fs = require('fs');
+const path = require('path');
+const crypto = require('crypto');
+
+const ENV_FILE_PATH = path.join(__dirname, '.env');
+
+function generateSecret(length = 64) {
+  return crypto.randomBytes(length).toString('base64');
+}
+
+function parseEnvContent(content) {
+  const lines = content.split('\n');
+  const result = {};
+  
+  for (const line of lines) {
+    const trimmed = line.trim();
+    if (!trimmed || trimmed.startsWith('#')) continue;
+    
+    const equalIndex = trimmed.indexOf('=');
+    if (equalIndex > 0) {
+      const key = trimmed.substring(0, equalIndex).trim();
+      const value = trimmed.substring(equalIndex + 1).trim();
+      result[key] = value;
+    }
+  }
+  
+  return result;
+}
+
+function stringifyEnvContent(envObj, originalContent) {
+  const lines = originalContent.split('\n');
+  const updatedLines = [];
+  
+  for (const line of lines) {
+    const trimmed = line.trim();
+    
+    if (!trimmed || trimmed.startsWith('#')) {
+      updatedLines.push(line);
+      continue;
+    }
+    
+    const equalIndex = trimmed.indexOf('=');
+    if (equalIndex > 0) {
+      const key = trimmed.substring(0, equalIndex).trim();
+      
+      if (key === 'JWT_SECRET' && envObj.hasOwnProperty('JWT_SECRET')) {
+        updatedLines.push(`JWT_SECRET=${envObj.JWT_SECRET}`);
+      } else {
+        updatedLines.push(line);
+      }
+    } else {
+      updatedLines.push(line);
+    }
+  }
+  
+  return updatedLines.join('\n');
+}
+
+function ensureJwtSecret() {
+  const currentSecret = process.env.JWT_SECRET;
+  
+  if (currentSecret && currentSecret.length >= 32) {
+    console.log('✓ JWT_SECRET 已配置');
+    return currentSecret;
+  }
+  
+  if (process.env.NODE_ENV === 'production') {
+    throw new Error(
+      '[致命错误] 生产环境未设置 JWT_SECRET 环境变量！\n' +
+      '请在服务器环境变量中设置强密钥（至少32位随机字符）。\n' +
+      '生成命令（PowerShell）：-join ((48..57) + (65..90) + (97..122) | Get-Random -Count 64 | ForEach-Object { [char]$_ })'
+    );
+  }
+  
+  const newSecret = generateSecret(64);
+  console.log('⚠️  JWT_SECRET 未配置或长度不足，正在自动生成...');
+  
+  try {
+    if (fs.existsSync(ENV_FILE_PATH)) {
+      const originalContent = fs.readFileSync(ENV_FILE_PATH, 'utf-8');
+      const updatedContent = stringifyEnvContent({ JWT_SECRET: newSecret }, originalContent);
+      fs.writeFileSync(ENV_FILE_PATH, updatedContent, 'utf-8');
+      console.log('✓ JWT_SECRET 已自动生成并保存到 .env 文件');
+    } else {
+      const defaultContent = `# IDC设备管理系统 - 环境配置
+# 自动生成时间: ${new Date().toISOString()}
+
+JWT_SECRET=${newSecret}
+`;
+      fs.writeFileSync(ENV_FILE_PATH, defaultContent, 'utf-8');
+      console.log('✓ JWT_SECRET 已自动生成并创建 .env 文件');
+    }
+    
+    process.env.JWT_SECRET = newSecret;
+    return newSecret;
+  } catch (err) {
+    console.warn('⚠️  无法保存 JWT_SECRET 到 .env 文件，使用临时密钥（重启后失效）');
+    console.warn('   错误信息:', err.message);
+    process.env.JWT_SECRET = newSecret;
+    return newSecret;
+  }
+}
+
+module.exports = {
+  ensureJwtSecret,
+  generateSecret,
+};