如何使用node.js为要上载到Google云端存储的文件设置内容类型

Question

我正在编写代码,使用gcloud-node将使用node-fetch获取的文件上传到Google云端存储中的存储桶.

到目前为止一切正常,但我无法找到如何Content-Type在GCloud上设置文件,否则文件下载为application/octet-stream.

这是我到目前为止的代码:

function saveImage(response, destFile) {
  return new Promise((resolve, reject) => {
    if (response.status !== 200) {
      reject(new Error('Bad Response'));
    }

    // How do I set this on the file uploaded to the bucket?
    const contentType = response.headers.get('Content-Type');

    try {
      const file = bucket.file(destFile);
      const writeStream = file.createWriteStream();

      writeStream.on('error', err => {
        reject(err);
      });

      writeStream.on('finish', () => {
        resolve(getPublicUrl(destFile));
      });

      response.body.pipe(writeStream);
    } catch (e) {
      reject(e);
    }
  });
}

Answer 1

事实证明,文件中有一个setMetadata方法,您可以调用Content-Type作为参数.以下是工作代码的样子:

function saveImage(response, destFile) {
  return new Promise((resolve, reject) => {
    if (response.status !== 200) {
      reject(new Error('Bad Response'));
    }

    const contentType = response.headers.get('Content-Type');
    try {
      const file = bucket.file(destFile);

      const writeStream = file.createWriteStream({
        metadata:{
          contentType: contentType
        }
      });

      writeStream.on('error', err => {
        reject(err);
      });

      writeStream.on('finish', () => {
        resolve(getPublicUrl(destFile));
      });

      response.body.pipe(writeStream);
    } catch (e) {
      reject(e);
    }
  });
}