Viber机器人从缓冲区发送文件

Question

我正在尝试使用viber-bot将pdf文件发送到客户端，但我在本地没有这些文件，也没有use。我从其他请求中获取所需的文件，并且我在viber-bot文档中没有找到任何有关缓冲区的内容。下面是我的代码：

const ViberBot = require('viber-bot').Bot,
  BotEvents = require('viber-bot').Events,
  TextMessage = require('viber-bot').Message.Text,
  FileMessage = require('viber-bot').Message.File,
  express = require('express');
const app = express();

if (!process.env.BOT_ACCOUNT_TOKEN) {
  console.log('Could not find bot account token key.');
  return;
}
if (!process.env.EXPOSE_URL) {
  console.log('Could not find exposing url');
  return;
}

const bot = new ViberBot({
  authToken: process.env.BOT_ACCOUNT_TOKEN,
  name: process.env.BOT_NAME,
  avatar: ''
});
bot.on(BotEvents.SUBSCRIBED, response => {
  response.send(new TextMessage(`Hi there ${response.userProfile.name}. I am ${bot.name}! Feel free to ask me anything.`));
});
bot.onSubscribe(response => console.log(`Subscribed: ${response.userProfile.name}`));
bot.on(BotEvents.MESSAGE_RECEIVED, async (message, response) => {
  try {
//use buffer instead of urls
    await response.send(
new FileMessage('https://upload.wikimedia.org/wikipedia/commons/3/3d/Katze_weiss.png', 2, 'test.png')).catch(err => console.log(err))
  } catch(err) {
    console.log(err);
  }

  response.send(new TextMessage(`Message received.`));
});
const port = process.env.PORT || 3000;
app.use("/viber/webhook", bot.middleware());
app.listen(port, () => {
  console.log(`Application running on port: ${port}`);
  bot.setWebhook(`${process.env.EXPOSE_URL}/viber/webhook`).catch(error => {
    console.log('Can not set webhook on following server. Is it running?');
    console.error(error);
    process.exit(1);
  });
});

Answer 1

是什么给我带来了好处：

• Viber Bot在Node.js
• 下的本地服务器上运行，生成并公开一个特定链接，该链接将ViberBot Live on internet.
• Generate .pdf并将其保存在本地路径(e.x。ngrokpath/myfiles/mypdf.pdf)

然后在你的机器人中使用：

var filename = "MyClientFile.pdf";
var urlstring = expose_url+"/myfiles/"+filename;    
var pdffilesize = 150; //kb                        
response.send(new FileMessage(urlstring, pdffilesize, filename));

expose_url是来自Ngrok会话的url。根据viber api，pdffilesize仅供参考。Viber Bot需要知道文件大小。

如果你不想存储本地文件并直接从buffer中检索，可以使用pdfmake插件。

生成您的pdf (base64字符串)，然后作为媒体馈送到viber消息。

希望这对你也有效...

Ngrok Link

pdfmake tutorial