mqtt gateway project

main/mqtt-gateway/utils/config-manager.js

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+const fs = require('fs');
+const path = require('path');
+const EventEmitter = require('events');
+
+class ConfigManager extends EventEmitter {
+  constructor(fileName) {
+    super();
+    this.config = {};  // 移除默认的 apiKeys 配置
+    this.configPath = path.join(__dirname, "..", "config", fileName);
+    this.loadConfig();
+    this.watchConfig();
+    // 添加防抖计时器变量
+    this.watchDebounceTimer = null;
+  }
+
+  loadConfig() {
+    try {
+      const data = fs.readFileSync(this.configPath, 'utf8');
+      const newConfig = JSON.parse(data);
+      
+      // 检测配置是否发生变化
+      if (JSON.stringify(this.config) !== JSON.stringify(newConfig)) {
+        console.log('配置已更新', this.configPath);
+        this.config = newConfig;
+        // 发出配置更新事件
+        this.emit('configChanged', this.config);
+      }
+    } catch (error) {
+      console.error('加载配置出错:', error, this.configPath);
+      if (error.code === 'ENOENT') {
+        this.createEmptyConfig();
+      }
+    }
+  }
+
+  createEmptyConfig() {
+    try {
+      const dir = path.dirname(this.configPath);
+      if (!fs.existsSync(dir)) {
+        fs.mkdirSync(dir, { recursive: true });
+      }
+      const defaultConfig = {};  // 空配置对象
+      fs.writeFileSync(this.configPath, JSON.stringify(defaultConfig, null, 2));
+      console.log('已创建空配置文件', this.configPath);
+    } catch (error) {
+      console.error('创建空配置文件出错:', error, this.configPath);
+    }
+  }
+
+  watchConfig() {
+    fs.watch(path.dirname(this.configPath), (eventType, filename) => {
+      if (filename === path.basename(this.configPath) && eventType === 'change') {
+        // 清除之前的计时器
+        if (this.watchDebounceTimer) {
+          clearTimeout(this.watchDebounceTimer);
+        }
+        // 设置新的计时器，300ms 后执行
+        this.watchDebounceTimer = setTimeout(() => {
+          this.loadConfig();
+        }, 300);
+      }
+    });
+  }
+
+  // 获取配置的方法
+  getConfig() {
+    return this.config;
+  }
+
+  // 获取特定配置项的方法
+  get(key) {
+    return this.config[key];
+  }
+}
+
+module.exports = {
+    ConfigManager
+};

main/mqtt-gateway/utils/mqtt_config_v2.js

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+require('dotenv').config();
+const crypto = require('crypto');
+
+
+function generatePasswordSignature(content, secretKey) {
+    // Create an HMAC object using SHA256 and the secretKey
+    const hmac = crypto.createHmac('sha256', secretKey);
+    
+    // Update the HMAC object with the clientId
+    hmac.update(content);
+    
+    // Generate the HMAC digest in binary format
+    const binarySignature = hmac.digest();
+    
+    // Encode the binary signature to Base64
+    const base64Signature = binarySignature.toString('base64');
+    
+    return base64Signature;
+}
+
+function validateMqttCredentials(clientId, username, password) {
+    // 验证密码签名
+    const signatureKey = process.env.MQTT_SIGNATURE_KEY;
+    if (signatureKey) {
+        const expectedSignature = generatePasswordSignature(clientId + '|' + username, signatureKey);
+        if (password !== expectedSignature) {
+            throw new Error('密码签名验证失败');
+        }
+    } else {
+        console.warn('缺少MQTT_SIGNATURE_KEY环境变量，跳过密码签名验证');
+    }
+
+    // 验证clientId
+    if (!clientId || typeof clientId !== 'string') {
+        throw new Error('clientId必须是非空字符串');
+    }
+    
+    // 验证clientId格式（必须包含@@@分隔符）
+    const clientIdParts = clientId.split('@@@');
+    // 新版本 MQTT 参数
+    if (clientIdParts.length !== 3) {
+        throw new Error('clientId格式错误，必须包含@@@分隔符');
+    }
+    
+    // 验证username
+    if (!username || typeof username !== 'string') {
+        throw new Error('username必须是非空字符串');
+    }
+    
+    // 尝试解码username（应该是base64编码的JSON）
+    let userData;
+    try {
+        const decodedUsername = Buffer.from(username, 'base64').toString();
+        userData = JSON.parse(decodedUsername);
+    } catch (error) {
+        throw new Error('username不是有效的base64编码JSON');
+    }
+    
+    // 解析clientId中的信息
+    const [groupId, macAddress, uuid] = clientIdParts;
+    
+    // 如果验证成功，返回解析后的有用信息
+    return { 
+        groupId,
+        macAddress: macAddress.replace(/_/g, ':'),
+        uuid,
+        userData
+    };
+}
+
+function generateMqttConfig(groupId, macAddress, uuid, userData) {
+    const endpoint = process.env.MQTT_ENDPOINT;
+    const signatureKey = process.env.MQTT_SIGNATURE_KEY;
+    if (!signatureKey) {
+        console.warn('No signature key, skip generating MQTT config');
+        return;
+    }
+    const deviceIdNoColon = macAddress.replace(/:/g, '_');
+    const clientId = `${groupId}@@@${deviceIdNoColon}@@@${uuid}`;
+    const username = Buffer.from(JSON.stringify(userData)).toString('base64');
+    const password = generatePasswordSignature(clientId + '|' + username, signatureKey);
+    return {
+        endpoint,
+        port: 8883,
+        client_id: clientId,
+        username,
+        password,
+        publish_topic: 'device-server',
+        subscribe_topic: 'null' // 旧版本固件不返回此字段会出错
+    }
+}
+
+module.exports = {
+    generateMqttConfig,
+    validateMqttCredentials
+}
+
+if (require.main === module) {
+    const config = generateMqttConfig('GID_test', '11:22:33:44:55:66', '36c98363-3656-43cb-a00f-8bced2391a90', { ip: '222.222.222.222' });
+    console.log('config', config);
+    const credentials = validateMqttCredentials(config.client_id, config.username, config.password);
+    console.log('credentials', credentials);
+}