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/*
 * Copyright 2015-2016 ksyun.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://ksyun.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.ksc.auth;

import static com.ksc.SDKGlobalConfiguration.ACCESS_KEY_ENV_VAR;
import static com.ksc.SDKGlobalConfiguration.ALTERNATE_ACCESS_KEY_ENV_VAR;
import static com.ksc.SDKGlobalConfiguration.ALTERNATE_SECRET_KEY_ENV_VAR;
import static com.ksc.SDKGlobalConfiguration.AWS_SESSION_TOKEN_ENV_VAR;
import static com.ksc.SDKGlobalConfiguration.SECRET_KEY_ENV_VAR;

import com.ksc.KscClientException;
import com.ksc.util.StringUtils;

/**
 * {@link AWSCredentialsProvider} implementation that provides credentials
 * by looking at the: AWS_ACCESS_KEY_ID (or AWS_ACCESS_KEY) and
 * AWS_SECRET_KEY (or AWS_SECRET_ACCESS_KEY) environment variables.
 */
public class EnvironmentVariableCredentialsProvider implements AWSCredentialsProvider {
    @Override
    public AWSCredentials getCredentials() {
        String accessKey = System.getenv(ACCESS_KEY_ENV_VAR);
        if (accessKey == null) {
            accessKey = System.getenv(ALTERNATE_ACCESS_KEY_ENV_VAR);
        }

        String secretKey = System.getenv(SECRET_KEY_ENV_VAR);
        if (secretKey == null) {
            secretKey = System.getenv(ALTERNATE_SECRET_KEY_ENV_VAR);
        }

        accessKey = StringUtils.trim(accessKey);
        secretKey = StringUtils.trim(secretKey);
        String sessionToken =
            StringUtils.trim(System.getenv(AWS_SESSION_TOKEN_ENV_VAR));

        if (StringUtils.isNullOrEmpty(accessKey)
                || StringUtils.isNullOrEmpty(secretKey)) {

            throw new KscClientException(
                    "Unable to load AWS credentials from environment variables " +
                    "(" + ACCESS_KEY_ENV_VAR + " (or " + ALTERNATE_ACCESS_KEY_ENV_VAR + ") and " +
                    SECRET_KEY_ENV_VAR + " (or " + ALTERNATE_SECRET_KEY_ENV_VAR + "))");
        }

        return sessionToken == null ?
                new BasicAWSCredentials(accessKey, secretKey)
                :
                new BasicSessionCredentials(accessKey, secretKey, sessionToken);
    }

    @Override
    public void refresh() {}

    @Override
    public String toString() {
        return getClass().getSimpleName();
    }
}