Document support for Web Identity Token in DefaultCredentialsProvider

[jamieliu386]

Motivation and Context

The Javadoc for DefaultCredentialsProvider lists the ways it tries to search for credentials in the surrounding environment. However, missing from the list is the support for STS Web Identity Tokens. The DefaultCredentialsProvider actually tries WebIdentityTokenFileCredentialsProvider in between environment variables and profile files, as seen here:

aws-sdk-java-v2/core/auth/src/main/java/software/amazon/awssdk/auth/credentials/DefaultCredentialsProvider.java

Lines 71 to 92 in 855bba6

	return LazyAwsCredentialsProvider.create(() -> {
	AwsCredentialsProvider[] credentialsProviders = new AwsCredentialsProvider[] {
	SystemPropertyCredentialsProvider.create(),
	EnvironmentVariableCredentialsProvider.create(),
	WebIdentityTokenFileCredentialsProvider.create(),
	ProfileCredentialsProvider.builder()
	.profileFile(builder.profileFile)
	.profileName(builder.profileName)
	.build(),
	ContainerCredentialsProvider.builder()
	.asyncCredentialUpdateEnabled(asyncCredentialUpdateEnabled)
	.build(),
	InstanceProfileCredentialsProvider.builder()
	.asyncCredentialUpdateEnabled(asyncCredentialUpdateEnabled)
	.build()
	};
	return AwsCredentialsProviderChain.builder()
	.reuseLastProviderEnabled(reuseLastProviderEnabled)
	.credentialsProviders(credentialsProviders)
	.build();
	});

Description

This PR adds information on the support for web identity tokens to the Javadoc for DefaultCredentialsProvider. Note that the 1.x SDK documentation already has this information.

Testing

N/A

Screenshots (if appropriate)

N/A

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Checklist

• I have read the CONTRIBUTING document
• Local run of mvn install succeeds
• My code follows the code style of this project
• My change requires a change to the Javadoc documentation
• I have updated the Javadoc documentation accordingly
• I have read the README document
• I have added tests to cover my changes (none needed)
• All new and existing tests passed
• A short description of the change has been added to the CHANGELOG (not sure if this simple change needs to be documented)
• My change is to implement 1.11 parity feature and I have updated LaunchChangelog

License

• I confirm that this pull request can be released under the Apache 2 license

[debora-ito]

Thank you for fixing the docs @jamieliu386!

Re-read the change.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[debora-ito]

@all-contributors please add @jamieliu386 for documentation

[allcontributors]

@debora-ito

I've put up a pull request to add @jamieliu386! 🎉

[dagnir]

(Trying this again to see if the bot will create a fresh PR since #2674 now has merge conflicts)

@all-contributors please add @jamieliu386 for documentation

[allcontributors]

@dagnir

@jamieliu386 already contributed before to doc

[dagnir]

(Once more with PR closed)

@all-contributors please add @jamieliu386 for documentation

[allcontributors]

@dagnir

@jamieliu386 already contributed before to doc