# Amazon SDK examples to configure topic attributes


The following code examples show how to use `SetTopicAttributes`.

------
#### [ CLI ]

**Amazon CLI**  
**To set an attribute for a topic**  
The following `set-topic-attributes` example sets the `DisplayName` attribute for the specified topic.  

```
aws sns set-topic-attributes \
    --topic-arn arn:aws:sns:us-west-2:123456789012:MyTopic \
    --attribute-name DisplayName \
    --attribute-value MyTopicDisplayName
```
This command produces no output.  
+  For API details, see [SetTopicAttributes](https://awscli.amazonaws.com/v2/documentation/api/latest/reference/sns/set-topic-attributes.html) in *Amazon CLI Command Reference*. 

------
#### [ Java ]

**SDK for Java 2.x**  
 There's more on GitHub. Find the complete example and learn how to set up and run in the [Amazon Code Examples Repository](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/javav2/example_code/sns#code-examples). 

```
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.sns.SnsClient;
import software.amazon.awssdk.services.sns.model.SetTopicAttributesRequest;
import software.amazon.awssdk.services.sns.model.SetTopicAttributesResponse;
import software.amazon.awssdk.services.sns.model.SnsException;

/**
 * Before running this Java V2 code example, set up your development
 * environment, including your credentials.
 *
 * For more information, see the following documentation topic:
 *
 * https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/get-started.html
 */
public class SetTopicAttributes {

    public static void main(String[] args) {
        final String usage = """

                Usage:    <attribute> <topicArn> <value>

                Where:
                   attribute - The attribute action to use. Valid parameters are: Policy | DisplayName | DeliveryPolicy .
                   topicArn - The ARN of the topic.\s
                   value - The value for the attribute.
                """;

        if (args.length < 3) {
            System.out.println(usage);
            System.exit(1);
        }

        String attribute = args[0];
        String topicArn = args[1];
        String value = args[2];

        SnsClient snsClient = SnsClient.builder()
                .region(Region.US_EAST_1)
                .build();

        setTopAttr(snsClient, attribute, topicArn, value);
        snsClient.close();
    }

    public static void setTopAttr(SnsClient snsClient, String attribute, String topicArn, String value) {
        try {
            SetTopicAttributesRequest request = SetTopicAttributesRequest.builder()
                    .attributeName(attribute)
                    .attributeValue(value)
                    .topicArn(topicArn)
                    .build();

            SetTopicAttributesResponse result = snsClient.setTopicAttributes(request);
            System.out.println(
                    "\n\nStatus was " + result.sdkHttpResponse().statusCode() + "\n\nTopic " + request.topicArn()
                            + " updated " + request.attributeName() + " to " + request.attributeValue());

        } catch (SnsException e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
    }
}
```
+  For API details, see [SetTopicAttributes](https://docs.amazonaws.cn/goto/SdkForJavaV2/sns-2010-03-31/SetTopicAttributes) in *Amazon SDK for Java 2.x API Reference*. 

------
#### [ JavaScript ]

**SDK for JavaScript (v3)**  
 There's more on GitHub. Find the complete example and learn how to set up and run in the [Amazon Code Examples Repository](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/javascriptv3/example_code/sns#code-examples). 
Create the client in a separate module and export it.  

```
import { SNSClient } from "@aws-sdk/client-sns";

// The AWS Region can be provided here using the `region` property. If you leave it blank
// the SDK will default to the region set in your AWS config.
export const snsClient = new SNSClient({});
```
Import the SDK and client modules and call the API.  

```
import { SetTopicAttributesCommand } from "@aws-sdk/client-sns";
import { snsClient } from "../libs/snsClient.js";

export const setTopicAttributes = async (
  topicArn = "TOPIC_ARN",
  attributeName = "DisplayName",
  attributeValue = "Test Topic",
) => {
  const response = await snsClient.send(
    new SetTopicAttributesCommand({
      AttributeName: attributeName,
      AttributeValue: attributeValue,
      TopicArn: topicArn,
    }),
  );
  console.log(response);
  // {
  //   '$metadata': {
  //     httpStatusCode: 200,
  //     requestId: 'd1b08d0e-e9a4-54c3-b8b1-d03238d2b935',
  //     extendedRequestId: undefined,
  //     cfId: undefined,
  //     attempts: 1,
  //     totalRetryDelay: 0
  //   }
  // }
  return response;
};
```
+  For more information, see [Amazon SDK for JavaScript Developer Guide](https://docs.amazonaws.cn/sdk-for-javascript/v3/developer-guide/sns-examples-managing-topics.html#sns-examples-managing-topicsstttopicattributes). 
+  For API details, see [SetTopicAttributes](https://docs.amazonaws.cn/AWSJavaScriptSDK/v3/latest/client/sns/command/SetTopicAttributesCommand) in *Amazon SDK for JavaScript API Reference*. 

------
#### [ Kotlin ]

**SDK for Kotlin**  
 There's more on GitHub. Find the complete example and learn how to set up and run in the [Amazon Code Examples Repository](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/kotlin/services/sns#code-examples). 

```
suspend fun setTopAttr(
    attribute: String?,
    topicArnVal: String?,
    value: String?,
) {
    val request =
        SetTopicAttributesRequest {
            attributeName = attribute
            attributeValue = value
            topicArn = topicArnVal
        }

    SnsClient.fromEnvironment { region = "us-east-1" }.use { snsClient ->
        snsClient.setTopicAttributes(request)
        println("Topic ${request.topicArn} was updated.")
    }
}
```
+  For API details, see [SetTopicAttributes](https://sdk.amazonaws.com/kotlin/api/latest/index.html) in *Amazon SDK for Kotlin API reference*. 

------
#### [ PHP ]

**SDK for PHP**  
 There's more on GitHub. Find the complete example and learn how to set up and run in the [Amazon Code Examples Repository](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/php/example_code/sns#code-examples). 

```
require 'vendor/autoload.php';

use Aws\Exception\AwsException;
use Aws\Sns\SnsClient;


/**
 * Configure the message delivery status attributes for an Amazon SNS Topic.
 *
 * This code expects that you have AWS credentials set up per:
 * https://docs.aws.amazon.com/sdk-for-php/v3/developer-guide/guide_credentials.html
 */

$SnSclient = new SnsClient([
    'profile' => 'default',
    'region' => 'us-east-1',
    'version' => '2010-03-31'
]);
$attribute = 'Policy | DisplayName | DeliveryPolicy';
$value = 'First Topic';
$topic = 'arn:aws:sns:us-east-1:111122223333:MyTopic';

try {
    $result = $SnSclient->setTopicAttributes([
        'AttributeName' => $attribute,
        'AttributeValue' => $value,
        'TopicArn' => $topic,
    ]);
    var_dump($result);
} catch (AwsException $e) {
    // output error message if fails
    error_log($e->getMessage());
}
```
+  For API details, see [SetTopicAttributes](https://docs.amazonaws.cn/goto/SdkForPHPV3/sns-2010-03-31/SetTopicAttributes) in *Amazon SDK for PHP API Reference*. 

------
#### [ Ruby ]

**SDK for Ruby**  
 There's more on GitHub. Find the complete example and learn how to set up and run in the [Amazon Code Examples Repository](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/ruby/example_code/sns#code-examples). 

```
# Service class to enable an SNS resource with a specified policy
class SnsResourceEnabler
  # Initializes the SnsResourceEnabler with an SNS resource client
  #
  # @param sns_resource [Aws::SNS::Resource] The SNS resource client
  def initialize(sns_resource)
    @sns_resource = sns_resource
    @logger = Logger.new($stdout)
  end

  # Sets a policy on a specified SNS topic
  #
  # @param topic_arn [String] The ARN of the SNS topic
  # @param resource_arn [String] The ARN of the resource to include in the policy
  # @param policy_name [String] The name of the policy attribute to set
  def enable_resource(topic_arn, resource_arn, policy_name)
    policy = generate_policy(topic_arn, resource_arn)
    topic = @sns_resource.topic(topic_arn)

    topic.set_attributes({
                           attribute_name: policy_name,
                           attribute_value: policy
                         })
    @logger.info("Policy #{policy_name} set successfully for topic #{topic_arn}.")
  rescue Aws::SNS::Errors::ServiceError => e
    @logger.error("Failed to set policy: #{e.message}")
  end

  private

  # Generates a policy string with dynamic resource ARNs
  #
  # @param topic_arn [String] The ARN of the SNS topic
  # @param resource_arn [String] The ARN of the resource
  # @return [String] The policy as a JSON string
  def generate_policy(topic_arn, resource_arn)
    {
      Version: '2008-10-17',
      Id: '__default_policy_ID',
      Statement: [{
        Sid: '__default_statement_ID',
        Effect: 'Allow',
        Principal: { "AWS": '*' },
        Action: ['SNS:Publish'],
        Resource: topic_arn,
        Condition: {
          ArnEquals: {
            "AWS:SourceArn": resource_arn
          }
        }
      }]
    }.to_json
  end
end

# Example usage:
if $PROGRAM_NAME == __FILE__
  topic_arn = 'MY_TOPIC_ARN' # Should be replaced with a real topic ARN
  resource_arn = 'MY_RESOURCE_ARN' # Should be replaced with a real resource ARN
  policy_name = 'POLICY_NAME' # Typically, this is "Policy"

  sns_resource = Aws::SNS::Resource.new
  enabler = SnsResourceEnabler.new(sns_resource)

  enabler.enable_resource(topic_arn, resource_arn, policy_name)
end
```
+  For more information, see [Amazon SDK for Ruby Developer Guide](https://docs.amazonaws.cn/sdk-for-ruby/v3/developer-guide/sns-example-enable-resource.html). 
+  For API details, see [SetTopicAttributes](https://docs.amazonaws.cn/goto/SdkForRubyV3/sns-2010-03-31/SetTopicAttributes) in *Amazon SDK for Ruby API Reference*. 

------
#### [ SAP ABAP ]

**SDK for SAP ABAP**  
 There's more on GitHub. Find the complete example and learn how to set up and run in the [Amazon Code Examples Repository](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/sap-abap/services/sns#code-examples). 

```
    TRY.
        lo_sns->settopicattributes(
            iv_topicarn = iv_topic_arn
            iv_attributename  = iv_attribute_name
            iv_attributevalue = iv_attribute_value ).
        MESSAGE 'Set/updated SNS topic attributes.' TYPE 'I'.
      CATCH /aws1/cx_snsnotfoundexception.
        MESSAGE 'Topic does not exist.' TYPE 'E'.
    ENDTRY.
```
+  For API details, see [SetTopicAttributes](https://docs.amazonaws.cn/sdk-for-sap-abap/v1/api/latest/index.html) in *Amazon SDK for SAP ABAP API reference*. 

------