nifi-nar-bundles/nifi-aws-bundle/nifi-aws-processors/src/main/java/org/apache/nifi/processors/aws/credentials/provider/service/AWSCredentialsProviderControllerService.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache 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.apache.org/licenses/LICENSE-2.0
 *
 * 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.apache.nifi.processors.aws.credentials.provider.service;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.nifi.annotation.documentation.CapabilityDescription;
import org.apache.nifi.annotation.documentation.Tags;
import org.apache.nifi.annotation.lifecycle.OnEnabled;
import org.apache.nifi.components.PropertyDescriptor;
import org.apache.nifi.components.ValidationContext;
import org.apache.nifi.components.ValidationResult;
import org.apache.nifi.controller.AbstractControllerService;
import org.apache.nifi.controller.ConfigurationContext;
import org.apache.nifi.processor.exception.ProcessException;
import org.apache.nifi.processors.aws.credentials.provider.factory.CredentialPropertyDescriptors;
import org.apache.nifi.processors.aws.credentials.provider.factory.CredentialsProviderFactory;

import com.amazonaws.auth.AWSCredentialsProvider;

import static org.apache.nifi.processors.aws.credentials.provider.factory.CredentialPropertyDescriptors.ACCESS_KEY;
import static org.apache.nifi.processors.aws.credentials.provider.factory.CredentialPropertyDescriptors.ASSUME_ROLE_EXTERNAL_ID;
import static org.apache.nifi.processors.aws.credentials.provider.factory.CredentialPropertyDescriptors.ASSUME_ROLE_PROXY_PORT;
import static org.apache.nifi.processors.aws.credentials.provider.factory.CredentialPropertyDescriptors.ASSUME_ROLE_PROXY_HOST;
import static org.apache.nifi.processors.aws.credentials.provider.factory.CredentialPropertyDescriptors.ASSUME_ROLE_STS_ENDPOINT;
import static org.apache.nifi.processors.aws.credentials.provider.factory.CredentialPropertyDescriptors.CREDENTIALS_FILE;
import static org.apache.nifi.processors.aws.credentials.provider.factory.CredentialPropertyDescriptors.PROFILE_NAME;
import static org.apache.nifi.processors.aws.credentials.provider.factory.CredentialPropertyDescriptors.SECRET_KEY;
import static org.apache.nifi.processors.aws.credentials.provider.factory.CredentialPropertyDescriptors.USE_ANONYMOUS_CREDENTIALS;
import static org.apache.nifi.processors.aws.credentials.provider.factory.CredentialPropertyDescriptors.USE_DEFAULT_CREDENTIALS;

/**
 * Implementation of AWSCredentialsProviderService interface
 *
 * @see AWSCredentialsProviderService
 */
@CapabilityDescription("Defines credentials for Amazon Web Services processors. " +
        "Uses default credentials without configuration. " +
        "Default credentials support EC2 instance profile/role, default user profile, environment variables, etc. " +
        "Additional options include access key / secret key pairs, credentials file, named profile, and assume role credentials.")
@Tags({ "aws", "credentials","provider" })
public class AWSCredentialsProviderControllerService extends AbstractControllerService implements AWSCredentialsProviderService {

    public static final PropertyDescriptor ASSUME_ROLE_ARN = CredentialPropertyDescriptors.ASSUME_ROLE_ARN;
    public static final PropertyDescriptor ASSUME_ROLE_NAME = CredentialPropertyDescriptors.ASSUME_ROLE_NAME;
    public static final PropertyDescriptor MAX_SESSION_TIME = CredentialPropertyDescriptors.MAX_SESSION_TIME;

    private static final List<PropertyDescriptor> properties;

    static {
        final List<PropertyDescriptor> props = new ArrayList<>();
        props.add(USE_DEFAULT_CREDENTIALS);
        props.add(ACCESS_KEY);
        props.add(SECRET_KEY);
        props.add(CREDENTIALS_FILE);
        props.add(PROFILE_NAME);
        props.add(USE_ANONYMOUS_CREDENTIALS);
        props.add(ASSUME_ROLE_ARN);
        props.add(ASSUME_ROLE_NAME);
        props.add(MAX_SESSION_TIME);
        props.add(ASSUME_ROLE_EXTERNAL_ID);
        props.add(ASSUME_ROLE_PROXY_HOST);
        props.add(ASSUME_ROLE_PROXY_PORT);
        props.add(ASSUME_ROLE_STS_ENDPOINT);
        properties = Collections.unmodifiableList(props);
    }

    private volatile AWSCredentialsProvider credentialsProvider;
    protected final CredentialsProviderFactory credentialsProviderFactory = new CredentialsProviderFactory();

    @Override
    protected List<PropertyDescriptor> getSupportedPropertyDescriptors() {
        return properties;
    }

    @Override
    public AWSCredentialsProvider getCredentialsProvider() throws ProcessException {
        return credentialsProvider;
    }

    @Override
    protected Collection<ValidationResult> customValidate(final ValidationContext validationContext) {
        return credentialsProviderFactory.validate(validationContext);
    }

    @OnEnabled
    public void onConfigured(final ConfigurationContext context) {
        final Map<PropertyDescriptor, String> evaluatedProperties = new HashMap<>(context.getProperties());
        evaluatedProperties.keySet().forEach(propertyDescriptor -> {
            if (propertyDescriptor.isExpressionLanguageSupported()) {
                evaluatedProperties.put(propertyDescriptor,
                        context.getProperty(propertyDescriptor).evaluateAttributeExpressions().getValue());
            }
        });
        credentialsProvider = credentialsProviderFactory.getCredentialsProvider(evaluatedProperties);
        getLogger().debug("Using credentials provider: " + credentialsProvider.getClass());
    }

    @Override
    public String toString() {
        return "AWSCredentialsProviderService[id=" + getIdentifier() + "]";
    }
}