org.kuali.maven.wagon.auth.MavenAwsCredentialsProviderChain Maven / Gradle / Ivy

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* forked from net.adamcin.org.kuali.maven.wagons:maven-s3-wagon This project is an implementation of a multi-threaded Wagon provider for accessing Amazon's Simple Storage Service (S3). It enables Maven to download files from and deploy files to S3. It draws heavily from code developed by Ben Hale at SpringSource

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/**
 * Copyright 2010-2015 The Kuali Foundation
 *
 * Licensed under the Educational Community License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.opensource.org/licenses/ecl2.php
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.kuali.maven.wagon.auth;

import java.util.ArrayList;
import java.util.List;

import com.amazonaws.auth.profile.ProfileCredentialsProvider;
import org.apache.maven.wagon.authentication.AuthenticationInfo;

import com.amazonaws.auth.AWSCredentialsProvider;
import com.amazonaws.auth.AWSCredentialsProviderChain;
import com.amazonaws.auth.EnvironmentVariableCredentialsProvider;
import com.amazonaws.auth.InstanceProfileCredentialsProvider;
import com.amazonaws.auth.SystemPropertiesCredentialsProvider;
import com.google.common.base.Optional;
import org.apache.maven.wagon.repository.Repository;

/**
 * This chain searches for AWS credentials in system properties
 *  - environment variables - ~/.m2/settings.xml - ~/.aws/credentials - Amazon's EC2 Instance Metadata Service
 */
public final class MavenAwsCredentialsProviderChain extends AWSCredentialsProviderChain {

	public MavenAwsCredentialsProviderChain(Repository source, Optional auth) {
		super(getProviders(source, auth));
	}

	private static AWSCredentialsProvider[] getProviders(Repository source, Optional auth) {
		List providers = new ArrayList();

		// System properties always win
		providers.add(new SystemPropertiesCredentialsProvider());

		// Then fall through to environment variables
		providers.add(new EnvironmentVariableCredentialsProvider());

		// Then fall through to settings.xml
		providers.add(new AuthenticationInfoCredentialsProvider(auth));

		// Then fall through to a ProfileCredentialsProvider that looks for a credentials profile
		// using the repository id
		providers.add(new ProfileCredentialsProvider(source.getId()));

		// Then fall through to a ProfileCredentialsProvider that uses the AWS_PROFILE env variable
		// or the default profile, if it is defined
		providers.add(new ProfileCredentialsProvider());

		// Then fall through to Amazon's EC2 Instance Metadata Service
		// http://docs.aws.amazon.com/AWSSdkDocsJava/latest/DeveloperGuide/java-dg-roles.html
		// This allows you setup an IAM role, attach that role to an EC2 Instance at launch time,
		// and thus automatically provide the wagon with the credentials it needs
		providers.add(new InstanceProfileCredentialsProvider());

		return providers.toArray(new AWSCredentialsProvider[providers.size()]);
	}

}