Making requests using Amazon Web Services account or IAM user credentials - Amazon Simple Storage Service
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Making requests using Amazon Web Services account or IAM user credentials

You can use your Amazon Web Services account or IAM user security credentials to send authenticated requests to Amazon S3. This section provides examples of how you can send authenticated requests using the Amazon SDK for Java, Amazon SDK for .NET, and Amazon SDK for PHP. For a list of available Amazon SDKs, go to Sample Code and Libraries.

Each of these Amazon SDKs uses an SDK-specific credentials provider chain to find and use credentials and perform actions on behalf of the credentials owner. What all these credentials provider chains have in common is that they all look for your local Amazon credentials file.

For more information, see the topics below:

To create a local Amazon credentials file

The easiest way to configure credentials for your Amazon SDKs is to use an Amazon credentials file. If you use the Amazon Command Line Interface (Amazon CLI), you may already have a local Amazon credentials file configured. Otherwise, use the following procedure to set up a credentials file:

  1. Sign in to the Amazon Web Services Management Console and open the IAM console at https://console.amazonaws.cn/iam/.

  2. Create a new user with permissions limited to the services and actions that you want your code to have access to. For more information about creating a new user, see Creating IAM users (Console), and follow the instructions through step 8.

  3. Choose Download .csv to save a local copy of your Amazon credentials.

  4. On your computer, navigate to your home directory, and create an .aws directory. On Unix-based systems, such as Linux or OS X, this is in the following location:

    ~/.aws

    On Windows, this is in the following location:

    %HOMEPATH%\.aws
  5. In the .aws directory, create a new file named credentials.

  6. Open the credentials .csv file that you downloaded from the IAM console, and copy its contents into the credentials file using the following format:

    [default] aws_access_key_id = your_access_key_id aws_secret_access_key = your_secret_access_key
  7. Save the credentials file, and delete the .csv file that you downloaded in step 3.

Your shared credentials file is now configured on your local computer, and it's ready to be used with the Amazon SDKs.

Sending authenticated requests using the Amazon SDKs

Use the Amazon SDKs to send authenticated requests. For more information about sending authenticated requests, see Amazon security credentials or IAM Identity Center Authentication.

Java

To send authenticated requests to Amazon S3 using your Amazon Web Services account or IAM user credentials, do the following:

  • Use the AmazonS3ClientBuilder class to create an AmazonS3Client instance.

  • Run one of the AmazonS3Client methods to send requests to Amazon S3. The client generates the necessary signature from the credentials that you provide and includes it in the request.

The following example performs the preceding tasks. For information on creating and testing a working sample, see Getting Started in the Amazon SDK for Java Developer Guide.

import com.amazonaws.AmazonServiceException; import com.amazonaws.SdkClientException; import com.amazonaws.auth.profile.ProfileCredentialsProvider; import com.amazonaws.regions.Regions; import com.amazonaws.services.s3.AmazonS3; import com.amazonaws.services.s3.AmazonS3ClientBuilder; import com.amazonaws.services.s3.model.ListObjectsRequest; import com.amazonaws.services.s3.model.ObjectListing; import com.amazonaws.services.s3.model.S3ObjectSummary; import java.io.IOException; import java.util.List; public class MakingRequests { public static void main(String[] args) throws IOException { Regions clientRegion = Regions.DEFAULT_REGION; String bucketName = "*** Bucket name ***"; try { AmazonS3 s3Client = AmazonS3ClientBuilder.standard() .withCredentials(new ProfileCredentialsProvider()) .withRegion(clientRegion) .build(); // Get a list of objects in the bucket, two at a time, and // print the name and size of each object. ListObjectsRequest listRequest = new ListObjectsRequest().withBucketName(bucketName).withMaxKeys(2); ObjectListing objects = s3Client.listObjects(listRequest); while (true) { List<S3ObjectSummary> summaries = objects.getObjectSummaries(); for (S3ObjectSummary summary : summaries) { System.out.printf("Object \"%s\" retrieved with size %d\n", summary.getKey(), summary.getSize()); } if (objects.isTruncated()) { objects = s3Client.listNextBatchOfObjects(objects); } else { break; } } } catch (AmazonServiceException e) { // The call was transmitted successfully, but Amazon S3 couldn't process // it, so it returned an error response. e.printStackTrace(); } catch (SdkClientException e) { // Amazon S3 couldn't be contacted for a response, or the client // couldn't parse the response from Amazon S3. e.printStackTrace(); } } }
.NET

To send authenticated requests using your Amazon Web Services account or IAM user credentials:

  • Create an instance of the AmazonS3Client class.

  • Run one of the AmazonS3Client methods to send requests to Amazon S3. The client generates the necessary signature from the credentials that you provide and includes it in the request it sends to Amazon S3.

For more information, see Making requests using Amazon account or IAM user credentials >.

Note
  • You can create the AmazonS3Client client without providing your security credentials. Requests sent using this client are anonymous requests, without a signature. Amazon S3 returns an error if you send anonymous requests for a resource that is not publicly available.

  • You can create an Amazon Web Services account and create the required users. You can also manage credentials for those users. You need these credentials to perform the task in the following example. For more information, see Configure Amazon credentials in the Amazon SDK for .NET Developer Guide.

    You can then also configure your application to actively retrieve profiles and credentials, and then explicitly use those credentials when creating an Amazon service client. For more information, see Accessing credentials and profiles in an application in the Amazon SDK for .NET Developer Guide.

The following C# example shows how to perform the preceding tasks. For information about setting up and running the code examples, see Getting Started with the Amazon SDK for .NET in the Amazon SDK for .NET Developer Guide.

using Amazon; using Amazon.S3; using Amazon.S3.Model; using System; using System.Threading.Tasks; namespace Amazon.DocSamples.S3 { class MakeS3RequestTest { private const string bucketName = "*** bucket name ***"; // Specify your bucket region (an example region is shown). private static readonly RegionEndpoint bucketRegion = RegionEndpoint.USWest2; private static IAmazonS3 client; public static void Main() { using (client = new AmazonS3Client(bucketRegion)) { Console.WriteLine("Listing objects stored in a bucket"); ListingObjectsAsync().Wait(); } } static async Task ListingObjectsAsync() { try { ListObjectsRequest request = new ListObjectsRequest { BucketName = bucketName, MaxKeys = 2 }; do { ListObjectsResponse response = await client.ListObjectsAsync(request); // Process the response. foreach (S3Object entry in response.S3Objects) { Console.WriteLine("key = {0} size = {1}", entry.Key, entry.Size); } // If the response is truncated, set the marker to get the next // set of keys. if (response.IsTruncated) { request.Marker = response.NextMarker; } else { request = null; } } while (request != null); } catch (AmazonS3Exception e) { Console.WriteLine("Error encountered on server. Message:'{0}' when writing an object", e.Message); } catch (Exception e) { Console.WriteLine("Unknown encountered on server. Message:'{0}' when writing an object", e.Message); } } } }
PHP

The following PHP example shows how the client makes a request using your security credentials to list all of the buckets for your account.

require 'vendor/autoload.php'; use Aws\S3\Exception\S3Exception; use Aws\S3\S3Client; $bucket = '*** Your Bucket Name ***'; $s3 = new S3Client([ 'region' => 'us-east-1', 'version' => 'latest', ]); // Retrieve the list of buckets. $result = $s3->listBuckets(); try { // Retrieve a paginator for listing objects. $objects = $s3->getPaginator('ListObjects', [ 'Bucket' => $bucket ]); echo "Keys retrieved!" . PHP_EOL; // Print the list of objects to the page. foreach ($objects as $object) { echo $object['Key'] . PHP_EOL; } } catch (S3Exception $e) { echo $e->getMessage() . PHP_EOL; }
Note

You can create the S3Client client without providing your security credentials. Requests sent using this client are anonymous requests, without a signature. Amazon S3 returns an error if you send anonymous requests for a resource that is not publicly available. For more information, see Creating Anonymous Clients in the Amazon SDK for PHP Documentation.

Ruby

Before you can use version 3 of the Amazon SDK for Ruby to make calls to Amazon S3, you must set the Amazon access credentials that the SDK uses to verify your access to your buckets and objects. If you have shared credentials set up in the Amazon credentials profile on your local system, version 3 of the SDK for Ruby can use those credentials without your having to declare them in your code. For more information about setting up shared credentials, see Making requests using Amazon account or IAM user credentials .

The following Ruby code snippet uses the credentials in a shared Amazon credentials file on a local computer to authenticate a request to get all of the object key names in a specific bucket. It does the following:

  1. Creates an instance of the Aws::S3::Client class.

  2. Makes a request to Amazon S3 by enumerating objects in a bucket using the list_objects_v2 method of Aws::S3::Client. The client generates the necessary signature value from the credentials in the Amazon credentials file on your computer, and includes it in the request it sends to Amazon S3.

  3. Prints the array of object key names to the terminal.

# Prerequisites: # - An existing Amazon S3 bucket. require 'aws-sdk-s3' # @param s3_client [Aws::S3::Client] An initialized Amazon S3 client. # @param bucket_name [String] The bucket's name. # @return [Boolean] true if all operations succeed; otherwise, false. # @example # s3_client = Aws::S3::Client.new(region: 'us-west-2') # exit 1 unless list_bucket_objects?(s3_client, 'amzn-s3-demo-bucket') def list_bucket_objects?(s3_client, bucket_name) puts "Accessing the bucket named '#{bucket_name}'..." objects = s3_client.list_objects_v2( bucket: bucket_name, max_keys: 50 ) if objects.count.positive? puts 'The object keys in this bucket are (first 50 objects):' objects.contents.each do |object| puts object.key end else puts 'No objects found in this bucket.' end true rescue StandardError => e puts "Error while accessing the bucket named '#{bucket_name}': #{e.message}" false end # Example usage: def run_me region = 'us-west-2' bucket_name = 'BUCKET_NAME' s3_client = Aws::S3::Client.new(region: region) exit 1 unless list_bucket_objects?(s3_client, bucket_name) end run_me if $PROGRAM_NAME == __FILE__

If you don't have a local Amazon credentials file, you can still create the Aws::S3::Client resource and run code against Amazon S3 buckets and objects. Requests that are sent using version 3 of the SDK for Ruby are anonymous, with no signature by default. Amazon S3 returns an error if you send anonymous requests for a resource that's not publicly available.

You can use and expand the previous code snippet for SDK for Ruby applications, as in the following more robust example.

# Prerequisites: # - An existing Amazon S3 bucket. require 'aws-sdk-s3' # @param s3_client [Aws::S3::Client] An initialized Amazon S3 client. # @param bucket_name [String] The bucket's name. # @return [Boolean] true if all operations succeed; otherwise, false. # @example # s3_client = Aws::S3::Client.new(region: 'us-west-2') # exit 1 unless list_bucket_objects?(s3_client, 'amzn-s3-demo-bucket') def list_bucket_objects?(s3_client, bucket_name) puts "Accessing the bucket named '#{bucket_name}'..." objects = s3_client.list_objects_v2( bucket: bucket_name, max_keys: 50 ) if objects.count.positive? puts 'The object keys in this bucket are (first 50 objects):' objects.contents.each do |object| puts object.key end else puts 'No objects found in this bucket.' end true rescue StandardError => e puts "Error while accessing the bucket named '#{bucket_name}': #{e.message}" false end # Example usage: def run_me region = 'us-west-2' bucket_name = 'BUCKET_NAME' s3_client = Aws::S3::Client.new(region: region) exit 1 unless list_bucket_objects?(s3_client, bucket_name) end run_me if $PROGRAM_NAME == __FILE__
Go

The following example uses Amazon credentials automatically loaded by the SDK for Go from the shared credentials file.

package main import ( "context" "errors" "fmt" "github.com/aws/aws-sdk-go-v2/config" "github.com/aws/aws-sdk-go-v2/service/s3" "github.com/aws/smithy-go" ) // main uses the AWS SDK for Go V2 to create an Amazon Simple Storage Service // (Amazon S3) client and list up to 10 buckets in your account. // This example uses the default settings specified in your shared credentials // and config files. func main() { ctx := context.Background() sdkConfig, err := config.LoadDefaultConfig(ctx) if err != nil { fmt.Println("Couldn't load default configuration. Have you set up your AWS account?") fmt.Println(err) return } s3Client := s3.NewFromConfig(sdkConfig) count := 10 fmt.Printf("Let's list up to %v buckets for your account.\n", count) result, err := s3Client.ListBuckets(ctx, &s3.ListBucketsInput{}) if err != nil { var ae smithy.APIError if errors.As(err, &ae) && ae.ErrorCode() == "AccessDenied" { fmt.Println("You don't have permission to list buckets for this account.") } else { fmt.Printf("Couldn't list buckets for your account. Here's why: %v\n", err) } return } if len(result.Buckets) == 0 { fmt.Println("You don't have any buckets!") } else { if count > len(result.Buckets) { count = len(result.Buckets) } for _, bucket := range result.Buckets[:count] { fmt.Printf("\t%v\n", *bucket.Name) } } }