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Merge pull request #7 from Nordstrom/feature/4-connector-can-assume-i…
…am-role Functionality to allow connector to assume an AWS IAM role when invok…
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| language: java |
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src/main/java/com/nordstrom/kafka/connect/auth/AWSAssumeRoleCredentialsProvider.java
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| package com.nordstrom.kafka.connect.auth; | ||
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| import com.amazonaws.auth.AWSCredentials; | ||
| import com.amazonaws.auth.AWSCredentialsProvider; | ||
| import com.amazonaws.auth.STSAssumeRoleSessionCredentialsProvider; | ||
| import com.amazonaws.services.securitytoken.AWSSecurityTokenServiceClientBuilder; | ||
| import org.apache.kafka.common.Configurable; | ||
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| import java.util.Map; | ||
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| //import org.slf4j.Logger; | ||
| //import org.slf4j.LoggerFactory; | ||
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| public class AWSAssumeRoleCredentialsProvider implements AWSCredentialsProvider, Configurable { | ||
| // Uncomment slf4j imports and field declaration to enable logging. | ||
| // private static final Logger log = LoggerFactory.getLogger(AWSAssumeRoleCredentialsProvider.class); | ||
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| public static final String EXTERNAL_ID_CONFIG = "external.id"; | ||
| public static final String ROLE_ARN_CONFIG = "role.arn"; | ||
| public static final String SESSION_NAME_CONFIG = "session.name"; | ||
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| private String externalId; | ||
| private String roleArn; | ||
| private String sessionName; | ||
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| @Override | ||
| public void configure(Map<String, ?> map) { | ||
| externalId = getOptionalField(map, EXTERNAL_ID_CONFIG); | ||
| roleArn = getRequiredField(map, ROLE_ARN_CONFIG); | ||
| sessionName = getRequiredField(map, SESSION_NAME_CONFIG); | ||
| } | ||
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| @Override | ||
| public AWSCredentials getCredentials() { | ||
| AWSSecurityTokenServiceClientBuilder clientBuilder = AWSSecurityTokenServiceClientBuilder.standard(); | ||
| AWSCredentialsProvider provider = new STSAssumeRoleSessionCredentialsProvider.Builder(roleArn, sessionName) | ||
| .withStsClient(clientBuilder.defaultClient()) | ||
| .withExternalId(externalId) | ||
| .build(); | ||
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| return provider.getCredentials(); | ||
| } | ||
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| @Override | ||
| public void refresh() { | ||
| //Nothing to do really, since we are assuming a role. | ||
| } | ||
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| String getOptionalField(final Map<String, ?> map, final String fieldName) { | ||
| final Object field = map.get(fieldName); | ||
| if (isNotNull(field)) { | ||
| return field.toString(); | ||
| } | ||
| return null; | ||
| } | ||
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| String getRequiredField(final Map<String, ?> map, final String fieldName) { | ||
| final Object field = map.get(fieldName); | ||
| verifyNotNull(field, fieldName); | ||
| final String fieldValue = field.toString(); | ||
| verifyNotNullOrEmpty(fieldValue, fieldName); | ||
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| return fieldValue; | ||
| } | ||
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| private boolean isNotNull(final Object field) { | ||
| return null != field; | ||
| } | ||
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| private boolean isNotNullOrEmpty(final String field) { | ||
| return null != field && !field.isEmpty(); | ||
| } | ||
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| private void verifyNotNull(final Object field, final String fieldName) { | ||
| if (!isNotNull(field)) { | ||
| throw new IllegalArgumentException(String.format("The field '%1s' should not be null", fieldName)); | ||
| } | ||
| } | ||
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| private void verifyNotNullOrEmpty(final String field, final String fieldName) { | ||
| if (!isNotNullOrEmpty(field)) { | ||
| throw new IllegalArgumentException(String.format("The field '%1s' should not be null or empty", fieldName)); | ||
| } | ||
| } | ||
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| String getExternalId() { | ||
| return this.externalId; | ||
| } | ||
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| String getRoleArn() { | ||
| return this.roleArn; | ||
| } | ||
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| String getSessionName() { | ||
| return this.sessionName; | ||
| } | ||
| } |
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