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The AWS SDK for Java with support for OSGi. The AWS SDK for Java provides Java APIs for building software on AWS' cost-effective, scalable, and reliable infrastructure products. The AWS Java SDK allows developers to code against APIs for all of Amazon's infrastructure web services (Amazon S3, Amazon EC2, Amazon SQS, Amazon Relational Database Service, Amazon AutoScaling, etc).

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/*
 * Copyright 2011-2016 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file 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 com.amazonaws.auth.profile.internal;

import com.amazonaws.annotation.Immutable;
import com.amazonaws.annotation.SdkInternalApi;
import com.amazonaws.util.StringUtils;

/**
 * Loads profile name from the usual places or uses the default profile name.
 */
@SdkInternalApi
@Immutable
public class AwsProfileNameLoader {

    /**
     * Name of the default profile as specified in the configuration file.
     */
    public static final String DEFAULT_PROFILE_NAME = "default";

    /**
     * Environment variable name for overriding the default AWS profile
     */
    public static final String AWS_PROFILE_ENVIRONMENT_VARIABLE = "AWS_PROFILE";

    /**
     * System property name for overriding the default AWS profile
     */
    public static final String AWS_PROFILE_SYSTEM_PROPERTY = "aws.profile";

    public static final AwsProfileNameLoader INSTANCE = new AwsProfileNameLoader();

    private AwsProfileNameLoader() {
    }

    /**
     * TODO The order would make more sense as System Property, Environment Variable, Default
     * Profile name but we have to keep the current order for backwards compatiblity. Consider
     * changing this in a future major version.
     */
    public final String loadProfileName() {
        final String profileEnvVarOverride = getEnvProfileName();
        if (!StringUtils.isNullOrEmpty(profileEnvVarOverride)) {
            return profileEnvVarOverride;
        } else {
            final String profileSysPropOverride = getSysPropertyProfileName();
            if (!StringUtils.isNullOrEmpty(profileSysPropOverride)) {
                return profileSysPropOverride;
            } else {
                return DEFAULT_PROFILE_NAME;
            }
        }
    }

    private String getSysPropertyProfileName() {
        return StringUtils.trim(System.getProperty(AWS_PROFILE_SYSTEM_PROPERTY));
    }

    private String getEnvProfileName() {
        return StringUtils.trim(System.getenv(AWS_PROFILE_ENVIRONMENT_VARIABLE));
    }
}