Get Object ACL

Components

• Bucket Name
• Object Name

.NET

using Amazon;
using Amazon.S3;
using Amazon.S3.Model;
using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using System.Reflection;
using Newtonsoft.Json;

namespace GetObjectAcl
{
  class GetObjectAcl
  {
      private const string bucketName = "<BUCKET_NAME>";
      private const string objectName = "<OBJECT_NAME>";
      private static IAmazonS3 _s3Client;
      public static void Main()
      {
          var awsCredentials = new Amazon.Runtime.BasicAWSCredentials("<ACCESS-KEY>", "<SECRET-KEY>");
          var config = new AmazonS3Config { ServiceURL = "<ENDPOINT>" };
          _s3Client = new AmazonS3Client(awsCredentials, config);
          GetObjectAclAsync().Wait();
      }
      private static async Task GetObjectAclAsync()
      {
          try
          {
              GetACLResponse response = await _s3Client.GetACLAsync(new GetACLRequest
              {
                  BucketName = bucketName,
                  Key = objectName
              });

              Console.WriteLine(JsonConvert.SerializeObject(response, Formatting.Indented));
          }
          catch (AmazonS3Exception amazonS3Exception)
          {
              Console.WriteLine("An AmazonS3Exception was thrown. Exception: " + amazonS3Exception.ToString());
          }
          catch (Exception e)
          {
              Console.WriteLine("Exception: " + e.ToString());
          }
      }
  }
}

PHP

<?php
require('client.php');
$bucket = $config['sample_bucket'];
// Gets the access control list (ACL) of an object.
$key = 'file-uploaded-from-php-sdk.png';
try {
  $resp = $client->getObjectAcl([
      'Bucket' => $bucket,
      'Key' => $key,
  ]);
  echo "Succeed in retrieving object ACL as follows: \n";
  var_dump($resp);
} catch (AwsException $e) {
  // output error message if fails
  echo $e->getMessage();
  echo "\n";
}

Python

import boto3
import logging
from botocore.exceptions import ClientError

# Configure logging
logging.basicConfig(level=logging.INFO)

try:
   # S3 resource
   s3_resource = boto3.resource(
       's3',
       endpoint_url='endpoint_url',
       aws_access_key_id='access_key',
       aws_secret_access_key='secret_key'
   )

except Exception as exc:
   logging.error(exc)
else:
   try:
       bucket_name = 'sample_bucket_name'
       object_name = 'sample_object_name'

       bucket = s3_resource.Bucket(bucket_name)
       object_acl = bucket.Object(object_name).Acl()
       logging.info(object_acl.grants)
   except ClientError as e:
       logging.error(e)

Javascript

// Import required AWS SDK clients and commands for Node.js
const { S3Client, GetObjectAclCommand } = require('@aws-sdk/client-s3');

// Create an S3 client service object
const s3 = new S3Client({
  region: 'default',
  endpoint: 'endpoint_url',
  credentials: {
      accessKeyId: 'access_key',
      secretAccessKey: 'secret_key',
  },
});

const run = async () => {
  try {
      const response = await s3.send(
          new GetObjectAclCommand({
              Bucket: 'sample_bucket',
              Key: 'file.png',
          })
      );
      console.log('Success', response.Grants);
  } catch (err) {
      console.log('Error', err);
  }
};
run();

GO

package main

import (
  "github.com/aws/aws-sdk-go/aws"
  "github.com/aws/aws-sdk-go/aws/credentials"
  "github.com/aws/aws-sdk-go/aws/session"
  "github.com/aws/aws-sdk-go/service/s3"

  "fmt"
  "os"
)

// Gets the ACL for a bucket object
//
// Usage:
//     go run s3_get_object_acl.go BUCKET OBJECT
func main() {
  if len(os.Args) != 3 {
      exitErrorf("Bucket and object names required\nUsage: go run", os.Args[0], "BUCKET OBJECT")
  }

  bucket := os.Args[1]
  key := os.Args[2]

  // Initialize a session in us-west-2 that the SDK will use to load
  // credentials from the shared credentials file ~/.aws/credentials.
  sess, err := session.NewSession(&aws.Config{
      Credentials: credentials.NewStaticCredentials("<ACCESS_KEY>", "<SECRET_KEY>", ""),
  })
  svc := s3.New(sess, &aws.Config{
      Region:   aws.String("default"),
      Endpoint: aws.String("<ENDPOINT_URL>"),
  })

  // Get bucket ACL
  result, err := svc.GetObjectAcl(&s3.GetObjectAclInput{Bucket: &bucket, Key: &key})
  if err != nil {
      exitErrorf(err.Error())
  }

  fmt.Println("Owner:", *result.Owner.DisplayName)
  fmt.Println("")
  fmt.Println("Grants")

  for _, g := range result.Grants {
      if g.Grantee.DisplayName != nil {
          fmt.Println("  Grantee:   ", *g.Grantee.DisplayName)
          fmt.Println("  Type:      ", *g.Grantee.Type)
          fmt.Println("  Permission:", *g.Permission)
          fmt.Println("")
      } else if g.Grantee.URI != nil {
          fmt.Println("  Type:      ", *g.Grantee.Type)
          fmt.Println("  URI:      ", *g.Grantee.URI)
          fmt.Println("")
      }
  }
}

func exitErrorf(msg string, args ...interface{}) {
  fmt.Fprintf(os.Stderr, msg+"\n", args...)
  os.Exit(1)
}

The following command can be used to execute the aforementioned code, presuming the code file is called s3_get_object_acl.go:

go run s3_get_object_acl.go BUCKET_NAME OBJECT