生成预签名的网址后出现NoSuchKey错误 [英] I get NoSuchKey error after generating presigned url

问题描述

我正在尝试为我的s3存储桶生成预签名的url.之后，当我将生成的网址复制粘贴到浏览器中时，出现此错误

I am trying to generate presigned url for my s3 bucket. After that when i copy paste the generated url in browser i get this error

<Error>
<Code>NoSuchKey</Code>
<Message>The specified key does not exist.</Message>
<Key>xx</Key>
<RequestId>xx</RequestId>
<HostId>xx</HostId>
</Error>

我的代码:

const aws = require('aws-sdk');
const multer = require('multer');
const multerS3 = require('multer-s3');
const dotenv = require('dotenv');
dotenv.config();

let region = 'us-east-1';

aws.config.update({
  secretAccessKey: process.env.SECRET_ACCESS_KEY,
  accessKeyId: process.env.ACCESS_KEY_ID,
  region: region,
  signatureVersion: 'v4'
});

var s3 = new aws.S3({
  region:region
});

const fileFilter = (req, file, cb) => {
  if (file.mimetype === 'image/jpeg' || file.mimetype === 'image/png') {
    cb(null, true);
  } else {
    cb(new Error('Invalid file type, only JPEG and PNG is allowed!'), false);
  }
};

let bucketName = 'somebucketname123';

const signedUrlExpireSeconds = 60 * 5;

const url = s3.getSignedUrl('getObject', {
  Bucket: bucketName,
  Key: process.env.SECRET_ACCESS_KEY,
  Expires: signedUrlExpireSeconds
})

console.log('url', url);

const upload = multer({
  fileFilter: fileFilter,
  storage: multerS3({
    acl: 'public-read',
    s3,
    bucket: bucketName,
    key: function(req, file, cb) {       
      req.file = file.originalname;
      cb(null, file.originalname);
    }
  })
});



module.exports = upload;

我是aws的新手，我不知道自己在这里犯错了...

i am new to aws and i don't know what i am making wrong here...

当我将新生成的预签名URL粘贴到浏览器中时，应该怎么办?是否为某些特定文件生成了此预装网址?如果这是我应该在代码中的哪个位置，请告诉我s3存储桶中的哪个文件名

What should happen when i paste the new generated presigned url in the browser ? Is this preigned url generated for some specific file ? If it is where in my code should i tell, for which file name in my s3 bucket

推荐答案

bucketParms中的密钥应该是s3对象的密钥.

KEY in bucketParms should be the key of the s3 object.

用于从S3下载对象的签名网址

Signed Url for downloading an object from S3

桶:测试事件ObjectKey:myfolder/test.json

Bucket: test-events ObjectKey: myfolder/test.json

const bucketParms = {
  Bucket: "test-events",
  Key: "myfolder/test.json",
  Expires: 60,
};

用于下载:

s3.getSignedUrl("getObject", bucketParms, (error, url) => {
  if (error) console.log("error", error);
  if (url) console.log("url", url);
});

对于将对象上传到S3，我们仍然需要指定要上传到的存储桶和密钥.

for Uploading the object to S3 , we will still need to specify Bucket and Key to which we want to upload.

s3.getSignedUrl("putObject", bucketParms, (error, url) => {
  if (error) console.log("error", error);
  if (url) console.log("url", url);
});

要使用此URL进行上传，我们可以做卷发或邮递员

For using this URL for uploading, we can do a curl or postman

curl --location --request PUT 'https://test-events.s3.amazonaws.com/98..?X....' \
--header 'Content-Type: image/png' \
--data-binary '/Users/user/image/path'

或从带有正文 binary 的PostMan PUT/POST中选择文件.对象将上传到 myfolder/test.json (所选文件的名称无关紧要)

or From PostMan PUT/POST with Body binary and selecting the file. Object will be uploaded to myfolder/test.json (name of the file selected doesn't matter)

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