解码使用imap nodejs检索的base64图像电子邮件附件

const Imap = require('imap');
const fs = require('fs');

const imap = new Imap({
  user: 'your_email@example.com',
  password: 'your_password',
  host: 'imap.example.com',
  port: 993,
  tls: true
});

function decodeBase64Attachment(attachment) {
  const content = attachment.body;
  const decodedContent = Buffer.from(content, 'base64');
  // 可以根据需求进行进一步处理，例如保存为文件或使用其它库进行图像处理
  fs.writeFileSync('decoded_image.jpg', decodedContent);
}

imap.once('ready', () => {
  imap.openBox('INBOX', true, (err, box) => {
    if (err) throw err;
    const fetchOptions = { bodies: [''], struct: true };
    const fetch = imap.seq.fetch(box.messages.total + ':*', fetchOptions);
    fetch.on('message', (msg, seqno) => {
      msg.on('body', (stream, info) => {
        const buffers = [];
        stream.on('data', (chunk) => buffers.push(chunk));
        stream.on('end', () => {
          const buffer = Buffer.concat(buffers);
          const attachment = Imap.parseExtension(buffer).ext[0];
          if (attachment.params.encoding === 'base64') {
            decodeBase64Attachment(attachment);
          }
        });
      });
    });
    fetch.once('error', (err) => {
      console.error('Error fetching messages:', err);
    });
    fetch.once('end', () => {
      imap.end();
    });
  });
});

imap.once('error', (err) => {
  console.error('IMAP error:', err);
});

imap.once('end', () => {
  console.log('IMAP connection ended.');
});

imap.connect();