通过Node.js将base64编码的映像上传到Amazon S3

Question

昨天我做了一个深夜编码会话并创建了一个小node.js/JS(实际上是CoffeeScript,但CoffeeScript只是JavaScript,所以我们说JS)应用程序.

目标是什么:

1. 客户端将canvas canvasuri(png)发送到服务器(通过socket.io)
2. 服务器将图像上传到亚马逊s3

第1步完成.

服务器现在有一个字符串a la

data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAMgAAADICAYAAACt...

我的问题是:我将接下来的步骤"流"/上传到Amazon S3并在那里创建实际图像是什么？

knox https://github.com/LearnBoost/knox似乎是一个很棒的库,可以将东西输入S3,但我缺少的是base64-encoded-image-string和实际上传动作之间的粘合剂？

任何想法,指示和反馈欢迎.

Answer 1

对于那些仍在努力解决这个问题的人.这是我用本机aws-sdk的方法.

var AWS = require('aws-sdk');
AWS.config.loadFromPath('./s3_config.json');
var s3Bucket = new AWS.S3( { params: {Bucket: 'myBucket'} } );

在您的路由器方法中: - ContentType应设置为图像文件的内容类型

  buf = new Buffer(req.body.imageBinary.replace(/^data:image\/\w+;base64,/, ""),'base64')
  var data = {
    Key: req.body.userId, 
    Body: buf,
    ContentEncoding: 'base64',
    ContentType: 'image/jpeg'
  };
  s3Bucket.putObject(data, function(err, data){
      if (err) { 
        console.log(err);
        console.log('Error uploading data: ', data); 
      } else {
        console.log('succesfully uploaded the image!');
      }
  });

s3_config.json文件是: -

{
  "accessKeyId":"xxxxxxxxxxxxxxxx",
  "secretAccessKey":"xxxxxxxxxxxxxx",
  "region":"us-east-1"
}

Answer 2

好的,这个是如何将画布数据保存到文件的答案

基本上它在我的代码中像这样松散

buf = new Buffer(data.dataurl.replace(/^data:image\/\w+;base64,/, ""),'base64')


req = knoxClient.put('/images/'+filename, {
             'Content-Length': buf.length,
             'Content-Type':'image/png'
  })

req.on('response', (res) ->
  if res.statusCode is 200
      console.log('saved to %s', req.url)
      socket.emit('upload success', imgurl: req.url)
  else
      console.log('error %d', req.statusCode)
  )

req.end(buf)

Answer 3

这是我遇到的一篇文章中的代码，贴在下面：

const imageUpload = async (base64) => {

  const AWS = require('aws-sdk');

  const { ACCESS_KEY_ID, SECRET_ACCESS_KEY, AWS_REGION, S3_BUCKET } = process.env;

  AWS.config.setPromisesDependency(require('bluebird'));
  AWS.config.update({ accessKeyId: ACCESS_KEY_ID, secretAccessKey: SECRET_ACCESS_KEY, region: AWS_REGION });

  const s3 = new AWS.S3();

  const base64Data = new Buffer.from(base64.replace(/^data:image\/\w+;base64,/, ""), 'base64');

  const type = base64.split(';')[0].split('/')[1];

  const userId = 1;

  const params = {
    Bucket: S3_BUCKET,
    Key: `${userId}.${type}`, // type is not required
    Body: base64Data,
    ACL: 'public-read',
    ContentEncoding: 'base64', // required
    ContentType: `image/${type}` // required. Notice the back ticks
  }

  let location = '';
  let key = '';
  try {
    const { Location, Key } = await s3.upload(params).promise();
    location = Location;
    key = Key;
  } catch (error) {
  }

  console.log(location, key);

  return location;

}

module.exports = imageUpload;

阅读更多：http : //docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/S3.html#upload-property

学分：https : //medium.com/@mayneweb/upload-a-base64-image-data-from-nodejs-to-aws-s3-bucket-6c1bd945420f

Answer 4

接受的答案效果很好，但如果有人需要接受任何文件而不仅仅是图像，则此正则表达式效果很好：

/^data:.+;base64,/