AWS - Java based client using different CredentialsProvider

AWS Java client using different CredentialsProvider

Credentials to a AWS Java client can be passed in multiple ways. Let's see a few of the common ways of building Java client sourcing Credentials from different sources. In this Blog building a Lambda Client is demonstrated, however the same way any Client can be built (such as AmazonDynamoDB etc.)

• Credentials from ~/.aws/credentials file. Refer to this Blog for setting up Credentials

AWSLambda awsLambda = AWSLambdaClientBuilder.defaultClient();  

• Credentials from ~/.aws/credentials file using Profile name

String profileName = "lambdaUser";  
AWSCredentialsProvider credentialsProvider = new ProfileCredentialsProvider(profileName);  
AWSLambda awsLambda = AWSLambdaClientBuilder.standard().withCredentials(credentialsProvider).build();  

• Credentials from a properties file in the Classpath. By default AwsCredentials.properties file from Classpath is loaded, this can be overridden. 

 // Create a CredentilsProvider object using the AwsCredentials.properties in the classpath  
 AWSCredentialsProvider credentialsProvider = new ClasspathPropertiesFileCredentialsProvider();  
 // Build the Client using CredentialsProvider Object  
 AWSLambda awsLambda = AWSLambdaClientBuilder.standard().withCredentials(credentialsProvider).build();  

• Credentials passed directly in the Program

 // Access and Secret keys of User  
 String accessKey = "<YOUR_ACCESS_KEY>";  
 String secretKey = "<YOUR_SECRET_KEY>";  
 // Build a Credential object  
 AWSCredentials credentials = new BasicAWSCredentials(accessKey, secretKey);  
 // Create a CredentilsProvider object using the Credential object  
 AWSCredentialsProvider credentialsProvider = new AWSStaticCredentialsProvider(credentials);  
 // Build the Client using CredentialsProvider Object  
 AWSLambda awsLambda = AWSLambdaClientBuilder.standard().withCredentials(credentialsProvider)  

Complete source code can be checked out from the Git Repo