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我正在尝试在将图像发送到 s3 存储桶之前对其进行裁剪。我的问题在于我的 multerS3 选项 shouldTransform 被跳过，因此不进行转换。

这是我上传的整个文件

require('multer-s3-transform');
const aws = require('aws-sdk');
const multer = require('multer');
const multerS3 = require('multer-s3');
const sharp = require('sharp');

aws.config.update({
    secretAccessKey: secretAccessKey,
    accessKeyId: accessKeyId,
    region: region,
});

const s3 = new aws.S3();

const fileFilter = (req, file, cb) => {
    if (file.mimetype === 'image/jpeg' || file.mimetype === 'image/png' || file.mimetype === 'image/jpg') {
        cb(null, true);
    } else {
        cb(new Error(message.FAIL.invalidImage), false);
    }
};

const upload = multer({
    fileFilter,
    storage: multerS3({
        s3,
        bucket: bucket,
        acl: 'public-read',
        shouldTransform: function (req, file, cb) {
            console.log('in should transform ');
            cb(null, true);
        },
        transforms: [
            {
                id: 'original',
                key: function (req, file, cb) {
                    cb(null, Date.now().toString());
                },
                transform: function (req, file, cb) {
                    console.log('og');
                    cb(null, sharp().jpg())
                },
            },
            {
                id: 'resized',
                key: function (req, file, cb) {
                    cb(null, Date.now().toString());
                },
                transform: function (req, file, cb) {
                    console.log('thumbnail');
                    cb(null, sharp().resize(300, 300).jpg())
                },
            }
        ],
        metadata: function (req, file, cb) {
            cb(null, {fieldName: 'some meta'});
        },
        key: function (req, file, cb) {
            cb(null, Date.now().toString());
        },
    })
});

module.exports = upload;

这是我的路线

const photoUpload = upload.fields([{name: 'photo', maxCount: 1}]);
    // Route for uploading photo image
        app.post(routeRoot + '/upload/photo', function (req, res) {
            console.log('in route ');
            photoUpload(req, res, function (err) {
                if (err) {
                    return res.status(200).send({error: {message: err.message}});
                } else {
                    account.uploadPhoto(req, res);
                }
            })
        });

我得到的结果

files [Object: null prototype] {
  photo: [
    {
      fieldname: 'photo',
      originalname: '4.jpg',
      encoding: '7bit',
      mimetype: 'image/jpeg',
      size: 84154,
      bucket: '...',
      key: '...',
      acl: 'public-read',
      contentType: 'image/jpeg',
      contentDisposition: null,
      storageClass: 'STANDARD',
      serverSideEncryption: null,
      metadata: [Object],
      location: '...',
      etag: '...',
      versionId: undefined
    }
  ]
}

文件上传到 S3 有效，但没有被转换。我一直在试图弄清楚这一点。谢谢！

4

1 回答 1

1

我已经想通了。

const multerS3 = require('multer-s3-transform');

代替

const multerS3 = require('multer-s3');

出于某种原因，文档有“multer-s3”需要但没有“multer-s3-transform”，这是 shouldTransform 工作所需要的

于 2020-01-27T22:01:33.620 回答