Initial commit: 七牛云上传飞书机器人

功能：
- 飞书交互卡片支持
- 七牛云文件上传
- 自动 CDN 刷新
- 多存储桶配置
- 跨平台部署（Linux/macOS/Windows）
- Docker 支持

src/feishu-api.js

@@ -0,0 +1,151 @@
+/**
+ * 飞书 API 封装
+ */
+
+const axios = require('axios');
+const fs = require('fs');
+const path = require('path');
+const https = require('https');
+
+class FeishuAPI {
+  constructor() {
+    this.appId = process.env.FEISHU_APP_ID;
+    this.appSecret = process.env.FEISHU_APP_SECRET;
+    this.baseURL = 'https://open.feishu.cn/open-apis';
+    this.tokenCache = null;
+    this.tokenExpiry = 0;
+  }
+
+  // 获取访问令牌
+  async getAccessToken() {
+    if (this.tokenCache && Date.now() < this.tokenExpiry) {
+      return this.tokenCache;
+    }
+
+    try {
+      const response = await axios.post(
+        `${this.baseURL}/auth/v3/tenant_access_token/internal`,
+        {
+          app_id: this.appId,
+          app_secret: this.appSecret
+        },
+        {
+          headers: { 'Content-Type': 'application/json' }
+        }
+      );
+
+      const { tenant_access_token, expire } = response.data;
+      
+      if (response.data.code !== 0) {
+        throw new Error(`获取 token 失败：${response.data.msg}`);
+      }
+
+      this.tokenCache = tenant_access_token;
+      this.tokenExpiry = Date.now() + (expire - 300) * 1000; // 提前 5 分钟过期
+      
+      return tenant_access_token;
+    } catch (error) {
+      throw new Error(`飞书 API 错误：${error.message}`);
+    }
+  }
+
+  // 发送文本消息
+  async sendMessage(chatId, payload) {
+    const token = await this.getAccessToken();
+    
+    try {
+      const response = await axios.post(
+        `${this.baseURL}/im/v1/messages`,
+        {
+          receive_id: chatId,
+          msg_type: payload.msg_type,
+          content: payload.content
+        },
+        {
+          headers: {
+            'Authorization': `Bearer ${token}`,
+            'Content-Type': 'application/json'
+          }
+        }
+      );
+
+      if (response.data.code !== 0) {
+        throw new Error(`发送消息失败：${response.data.msg}`);
+      }
+
+      return response.data;
+    } catch (error) {
+      throw new Error(`飞书消息发送失败：${error.message}`);
+    }
+  }
+
+  // 发送卡片消息
+  async sendCard(chatId, card) {
+    return this.sendMessage(chatId, {
+      msg_type: 'interactive',
+      content: JSON.stringify(card)
+    });
+  }
+
+  // 下载文件
+  async downloadFile(fileKey) {
+    const token = await this.getAccessToken();
+    const tempDir = path.join(process.cwd(), 'temp');
+    
+    if (!fs.existsSync(tempDir)) {
+      fs.mkdirSync(tempDir, { recursive: true });
+    }
+
+    const tempFile = path.join(tempDir, `feishu_${Date.now()}_${fileKey}`);
+
+    return new Promise((resolve, reject) => {
+      const url = `${this.baseURL}/im/v1/files/${fileKey}/download`;
+      
+      https.get(url, {
+        headers: {
+          'Authorization': `Bearer ${token}`
+        }
+      }, (res) => {
+        if (res.statusCode !== 200) {
+          reject(new Error(`下载失败：${res.statusCode}`));
+          return;
+        }
+
+        const file = fs.createWriteStream(tempFile);
+        res.pipe(file);
+        file.on('finish', () => {
+          file.close();
+          resolve(tempFile);
+        });
+      }).on('error', reject);
+    });
+  }
+
+  // 回复消息
+  async replyMessage(messageId, payload) {
+    const token = await this.getAccessToken();
+    
+    try {
+      const response = await axios.post(
+        `${this.baseURL}/im/v1/messages`,
+        {
+          reply_id: messageId,
+          msg_type: payload.msg_type,
+          content: payload.content
+        },
+        {
+          headers: {
+            'Authorization': `Bearer ${token}`,
+            'Content-Type': 'application/json'
+          }
+        }
+      );
+
+      return response.data;
+    } catch (error) {
+      throw new Error(`飞书回复失败：${error.message}`);
+    }
+  }
+}
+
+module.exports = { FeishuAPI };