OSSにbase64エンコードされた画像を保存する

base64の画像データをOSSに保存します。

これは20x20ピクセルの正方形画像をbase64エンコードしたものです。

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

ちなみにこんなの↓。適当なスクショ。

上の画像をali-ossの.put()メソッドを使ってOSSに送信します。

// index.js
const OSS = require('ali-oss')
const client = new OSS({
  region: 'oss-ap-northeast-1',
  accessKeyId: 'xxxxxxxxxx',
  accessKeySecret: 'xxxxxxxxxxxxxxx',
});

client.useBucket('myBucket');
const base64EncodedImage = "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";

client.put('great.jpeg', new Buffer(base64EncodedImage, 'base64'), {mime: 'image/jpeg'}).then((r) => {
  console.log(r)
})

できました。

$ node index.js
{ name: 'great.jpeg',
  url:
   'http://xxxxxxx.oss-ap-northeast-1.aliyuncs.com/great.jpeg',
  res:
   { status: 200,
     statusCode: 200,
     headers:
      { server: 'AliyunOSS',
        date: 'Tue, 04 Sep 2018 10:46:21 GMT',
        'content-length': '0',
        connection: 'keep-alive',
        'x-oss-hash-crc64ecma': '4336817615697645645',
        'content-md5': 'hgOG0apst+UHhylCs8lorQ==',
        'x-oss-server-time': '19' },
     size: 0,
     aborted: false,
     rt: 146,
     keepAliveSocket: false,
     data: <Buffer >,
     requestUrls:
      [ 'http://xxxxxxxxxx.oss-ap-northeast-1.aliyuncs.com/great.jpeg' ],
     timing: null,
     remotePort: 80,
     socketHandledRequests: 1,
     socketHandledResponses: 1 } }