[SOLVED] What is equivalent of DefaultAWSCredentialsProviderChain in C#

Issue

While using S3Client in java, I used to initialize S3Client like this and it worked perfectly on local machine (where I have environment variables set) as well as EC2 instance (where I have IAM role):

AWSCredentials credentials = DefaultAWSCredentialsProviderChain.getInstance().getCredentials();
AmazonS3 s3client = new AmazonS3Client(credentials);

I want to do the same in C#.net. For that, I have to use different methods to run it on local machine and EC2 instance. Right now, I am doing it somewhat like this :

var awsCredentials = new EnvironmentVariablesAWSCredentials(); //For local
var awsCredentials2 = new InstanceProfileAWSCredentials(); //For EC2 instance 
var awsRegion = Environment.GetEnvironmentVariable("AWS_REGION");
AmazonS3Client s3Client = new AmazonS3Client(awsCredentials, RegionEndpoint.GetBySystemName(awsRegion));

I have gone through official AWS SDK for .Net's documentation

But what I can not find is, equivalent of this Java Method

DefaultAWSCredentialsProviderChain.getInstance().getCredentials()

Is there any method in C#.net that follows hierarchy of retrieving credentials and provide it?

Thanks in advance.

Solution

Solution is very simple:

Use an empty constructor for all AmazonClients (AmazonSQSClient/AmazonSNSClient/AmazonS3Client) or use constructor without AWSCredentials argument.

So code looks like this :

AmazonS3Client s3Client = new AmazonS3Client();

OR

var awsRegion = Environment.GetEnvironmentVariable("AWS_REGION");
AmazonS3Client s3Client = new AmazonS3Client(RegionEndpoint.GetBySystemName(awsRegion));

Documentation of empty constructor reads like this :

Constructs AmazonS3Client with the credentials loaded from the application's default configuration, and if unsuccessful from the Instance Profile service on an EC2 instance.

Answered By - Utsav Chokshi

Answer Checked By - Gilberto Lyons (WPSolving Admin)