如何从Node中的图片网址将图片上传到Google云端存储？

Question

给定图像网址,如何使用Node.js将该图像上传到Google云端存储以进行图像处理？

Answer 1

这是一个两步的过程:

• 使用请求或获取在本地下载文件.

• 使用官方库上传到GCL .

  var fs = require('fs');
  var gcloud = require('gcloud');
  
  // Authenticating on a per-API-basis. You don't need to do this if you auth on a
  // global basis (see Authentication section above).
  
  var gcs = gcloud.storage({
    projectId: 'my-project',
    keyFilename: '/path/to/keyfile.json'
  });
  
  // Create a new bucket.
  gcs.createBucket('my-new-bucket', function(err, bucket) {
    if (!err) {
      // "my-new-bucket" was successfully created.
    }
  });
  
  // Reference an existing bucket.
  var bucket = gcs.bucket('my-existing-bucket');                
  var localReadStream = fs.createReadStream('/photos/zoo/zebra.jpg');
  var remoteWriteStream = bucket.file('zebra.jpg').createWriteStream();
  localReadStream.pipe(remoteWriteStream)
    .on('error', function(err) {})
    .on('finish', function() {
      // The file upload is complete.
    });
  

如果要将文件另存为jpeg图像,则需要编辑remoteWriteStream流并添加自定义元数据:

var image = bucket.file('zebra.jpg');
localReadStream.pipe(image.createWriteStream({
    metadata: {
      contentType: 'image/jpeg',
      metadata: {
        custom: 'metadata'
      }
    }
}))

我在挖掘这些文档时发现了这一点

Answer 2

要添加到Yevgen Safronov的答案,我们可以将请求传递到写入流中,而无需将图像显式下载到本地文件系统中.

const request = require('request');
const storage = require('@google-cloud/storage')();

function saveToStorage(attachmentUrl, bucketName, objectName) {
  const req = request(attachmentUrl);
  req.pause();
  req.on('response', res => {

    // Don't set up the pipe to the write stream unless the status is ok.
    // See https://stackoverflow.com/a/26163128/2669960 for details.
    if (res.statusCode !== 200) {
      return;
    }

    const writeStream = storage.bucket(bucketName).file(objectName)
      .createWriteStream({

        // Tweak the config options as desired.
        gzip: true,
        public: true,
        metadata: {
          contentType: res.headers['content-type']
        }
      });
    req.pipe(writeStream)
      .on('finish', () => console.log('saved'))
      .on('error', err => {
        writeStream.end();
        console.error(err);
      });

    // Resume only when the pipe is set up.
    req.resume();
  });
  req.on('error', err => console.error(err));
}