从 firebase 存储下载图像并使用 node.js 云函数添加到 jszip

Question

几天来我一直在尝试各种方法，但都碰壁了。我将图像存储在 firebase 存储中，我想将其添加到一个 zip 文件中，该文件通过其他一些形式通过电子邮件发送出去。我已经尝试了很多次迭代，但是当 jpeg 文件被添加到输出的 zip 中时，它无法被任何应用程序打开。

这是我的最新版本：

exports.sendEmailPacket = functions.https.onRequest(async (request, response) => {
const userId = request.query.userId;

const image = await admin
    .storage()
    .bucket()
    .file(`images/${userId}`)
    .download();

const zipped = new JSZip();
zipped.file('my-image.jpg', image, { binary: true });

const content = await zipped.generateAsync({ type: 'nodebuffer' });

// this gets picked up by another cloud function that delivers the email
await admin.firestore()
    .collection("emails")
    .doc(userId)
    .set({
      to: 'myemail@gmail.com',
      message: {
        attachments: [
          {
            filename: 'test.mctesty.zip',
            content: Buffer.from(content)
          }
        ]
      }
    });

});

Answer 1

经过更多研究后能够解决这个问题：

exports.sendEmailPacket = functions.https.onRequest(async (request, response) => {
const userId = request.query.userId;

const image = await admin
    .storage()
    .bucket()
    .file(`images/${userId}`)
    .get(); // get instead of download

const zipped = new JSZip();
zipped.file('my-image.jpg', image[0].createReadStream(), { binary: true }); // from the 'File' type, call .createReadStream()

const content = await zipped.generateAsync({ type: 'nodebuffer' });

// this gets picked up by another cloud function that delivers the email
await admin.firestore()
    .collection("emails")
    .doc(userId)
    .set({
      to: 'myemail@gmail.com',
      message: {
        attachments: [
          {
            filename: 'test.mctesty.zip',
            content: Buffer.from(content)
          }
        ]
      }
    });

});