How do I put object to amazon s3 using presigned url?

user_3698232 0
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I am trying to use signed url to upload images to s3 bucket. Following is my bucket policy: 

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "",
            "Effect": "Allow",
            "Principal": {
                "AWS": [
                    "arn:aws:iam::12345678:user/myuser",
                    "arn:aws:iam::12345678:root"
                ]
            },
        "Action": [
                "s3:List*",
                "s3:Put*",
                "s3:Get*"
            ],
            "Resource": [
                "arn:aws:s3:::myBucket",
                "arn:aws:s3:::myBucket/*"
            ]
        }
    ]
}

I am generating the signed url from the server as follows:

var aws = require('aws-sdk');
aws.config = {
    accessKeyId: myAccessKeyId,
    secretAccessKey: mySecretAccessKey
};

var s3 = new aws.s3();
s3.getSignedUrl('putObject', {
    Bucket: 'myBucket',
    Expires: 60*60,
    key: 'myKey'
}, function (err, url) {
    console.log(url);
});

I get the url. But when I try to put an object I get the following error: 

<Error>
    <Code>AccessDenied</Code>
    <Message>Access Denied</Message>
    <RequestId>FXXXXXXXXX</RequestId>
    <HostId>fXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX</HostId>
</Error>

Update 1

Here is myuser's policy:

{
  "Version": "2012-10-17",
  "Statement": [
    {
        "Sid": "",
        "Effect": "Allow",
        "Principal": {
            "AWS": [
                "arn:aws:iam::2xxxxxxxxxxx:user/myuser",
                "arn:aws:iam::2xxxxxxxxxxx:root"
            ]
        },
        "Action": [
            "s3:*"
        ],
        "Resource": [
            "arn:aws:s3:::myBucket",
            "arn:aws:s3:::myBucket/*"
        ]
    }
  ]
}

Update 2 I can upload only when following option is set. I dont understand whats the use of bucket policy if only the manual selection of permission work.

Permission for everyone

Update 3

The following code works. Now the only problem is the signed url

 #!/bin/bash

 file="$1"

 bucket="mybucket"
 resource="/${bucket}/${file}"
 contentType="image/png"
 dateValue=`date -R`
 stringToSign="PUT\n\n${contentType}\n${dateValue}\n${resource}"
 s3Key="AKxxxxxxxxxxxxxxxxx"
 s3Secret="/Wuxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
 signature=`echo -en ${stringToSign} | openssl sha1 -hmac ${s3Secret}     -binary | base64`
 curl -X PUT -T "${file}" \
   -H "Host: ${bucket}.s3.amazonaws.com" \
   -H "Date: ${dateValue}" \
   -H "Content-Type: ${contentType}" \
   -H "Authorization: AWS ${s3Key}:${signature}" \
   https://${bucket}.s3.amazonaws.com/${file}
pre-signed-url node.js amazon-web-services amazon-s3 javascript
5 Answers

Here is the complete code for generating pre-signed URL for any type of file in S3.

  • If you want you can include expiration time using Expire parameter in parameter.
  • The below code will upload any type of file like excel(xlsx, pdf, jpeg)

    const AWS = require('aws-sdk');
    const fs = require('fs');
    const axios = require('axios');
    const s3 = new AWS.S3();
    const filePath = 'C:/Users/siva.cheedella/Downloads/invoice.pdf';
    
    
    var params = {
        Bucket: 'testing-presigned-url-dev',
        Key: 'dummy.pdf',
        "ContentType": "application/octet-stream"
    };
    
    
    s3.getSignedUrl('putObject', params, function (err, url) {
        console.log('The URL is', url);
    
        fs.writeFileSync("./url.txt", url);
    
    
        axios({
            method: "put",
            url,
            data: fs.readFileSync(filePath),
            headers: {
                "Content-Type": "application/octet-stream"
            }
        })
            .then((result) => {
                console.log('result', result);
    
            }).catch((err) => {
                console.log('err', err);
    
            });
    
    });

user_108712990
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