Uso de PutBucketCors con un AWS SDK o una CLI - Amazon Simple Storage Service

Uso de PutBucketCors con un AWS SDK o una CLI

En los siguientes ejemplos de código, se muestra cómo utilizar PutBucketCors.

.NET
AWS SDK for .NET
nota

Hay más en GitHub. Busque el ejemplo completo y aprenda a configurar y ejecutar en el Repositorio de ejemplos de código de AWS. 


        /// <summary>
        /// Add CORS configuration to the Amazon S3 bucket.
        /// </summary>
        /// <param name="client">The initialized Amazon S3 client object used
        /// to apply the CORS configuration to an Amazon S3 bucket.</param>
        /// <param name="configuration">The CORS configuration to apply.</param>
        private static async Task PutCORSConfigurationAsync(AmazonS3Client client, CORSConfiguration configuration)
        {
            PutCORSConfigurationRequest request = new PutCORSConfigurationRequest()
            {
                BucketName = BucketName,
                Configuration = configuration,
            };

            _ = await client.PutCORSConfigurationAsync(request);
        }

  • Para obtener información sobre la API, consulte PutBucketCors en la Referencia de la API de AWS SDK for .NET.

CLI
AWS CLI

El siguiente ejemplo habilita solicitudes PUT, POST y DELETE desde www.ejemplo.com, y habilita solicitudes GET desde cualquier dominio:

aws s3api put-bucket-cors --bucket MyBucket --cors-configuration file://cors.json

cors.json:
{
  "CORSRules": [
    {
      "AllowedOrigins": ["http://www.example.com"],
      "AllowedHeaders": ["*"],
      "AllowedMethods": ["PUT", "POST", "DELETE"],
      "MaxAgeSeconds": 3000,
      "ExposeHeaders": ["x-amz-server-side-encryption"]
    },
    {
      "AllowedOrigins": ["*"],
      "AllowedHeaders": ["Authorization"],
      "AllowedMethods": ["GET"],
      "MaxAgeSeconds": 3000
    }
  ]
}

  • Para obtener información acerca de la API, consulte PutBucketCors en la Referencia de comandos de la AWS CLI.

Java
SDK para Java 2.x
nota

Hay más en GitHub. Busque el ejemplo completo y aprenda a configurar y ejecutar en el Repositorio de ejemplos de código de AWS. 

import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.s3.S3Client;
import java.util.ArrayList;
import java.util.List;
import software.amazon.awssdk.services.s3.model.GetBucketCorsRequest;
import software.amazon.awssdk.services.s3.model.GetBucketCorsResponse;
import software.amazon.awssdk.services.s3.model.DeleteBucketCorsRequest;
import software.amazon.awssdk.services.s3.model.S3Exception;
import software.amazon.awssdk.services.s3.model.CORSRule;
import software.amazon.awssdk.services.s3.model.CORSConfiguration;
import software.amazon.awssdk.services.s3.model.PutBucketCorsRequest;

/**
 * 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 S3Cors {
    public static void main(String[] args) {
        final String usage = """

                Usage:
                    <bucketName> <accountId>\s

                Where:
                    bucketName - The Amazon S3 bucket to upload an object into.
                    accountId - The id of the account that owns the Amazon S3 bucket.
                """;

        if (args.length != 2) {
            System.out.println(usage);
            System.exit(1);
        }

        String bucketName = args[0];
        String accountId = args[1];
        Region region = Region.US_EAST_1;
        S3Client s3 = S3Client.builder()
                .region(region)
                .build();

        setCorsInformation(s3, bucketName, accountId);
        getBucketCorsInformation(s3, bucketName, accountId);
        deleteBucketCorsInformation(s3, bucketName, accountId);
        s3.close();
    }

    public static void deleteBucketCorsInformation(S3Client s3, String bucketName, String accountId) {
        try {
            DeleteBucketCorsRequest bucketCorsRequest = DeleteBucketCorsRequest.builder()
                    .bucket(bucketName)
                    .expectedBucketOwner(accountId)
                    .build();

            s3.deleteBucketCors(bucketCorsRequest);

        } catch (S3Exception e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
    }

    public static void getBucketCorsInformation(S3Client s3, String bucketName, String accountId) {
        try {
            GetBucketCorsRequest bucketCorsRequest = GetBucketCorsRequest.builder()
                    .bucket(bucketName)
                    .expectedBucketOwner(accountId)
                    .build();

            GetBucketCorsResponse corsResponse = s3.getBucketCors(bucketCorsRequest);
            List<CORSRule> corsRules = corsResponse.corsRules();
            for (CORSRule rule : corsRules) {
                System.out.println("allowOrigins: " + rule.allowedOrigins());
                System.out.println("AllowedMethod: " + rule.allowedMethods());
            }

        } catch (S3Exception e) {

            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
    }

    public static void setCorsInformation(S3Client s3, String bucketName, String accountId) {
        List<String> allowMethods = new ArrayList<>();
        allowMethods.add("PUT");
        allowMethods.add("POST");
        allowMethods.add("DELETE");

        List<String> allowOrigins = new ArrayList<>();
        allowOrigins.add("http://example.com");
        try {
            // Define CORS rules.
            CORSRule corsRule = CORSRule.builder()
                    .allowedMethods(allowMethods)
                    .allowedOrigins(allowOrigins)
                    .build();

            List<CORSRule> corsRules = new ArrayList<>();
            corsRules.add(corsRule);
            CORSConfiguration configuration = CORSConfiguration.builder()
                    .corsRules(corsRules)
                    .build();

            PutBucketCorsRequest putBucketCorsRequest = PutBucketCorsRequest.builder()
                    .bucket(bucketName)
                    .corsConfiguration(configuration)
                    .expectedBucketOwner(accountId)
                    .build();

            s3.putBucketCors(putBucketCorsRequest);

        } catch (S3Exception e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
    }
}

  • Para obtener información sobre la API, consulte PutBucketCors en la Referencia de la API de AWS SDK for Java 2.x.

JavaScript
SDK para JavaScript (v3)
nota

Hay más información en GitHub. Busque el ejemplo completo y aprenda a configurar y ejecutar en el Repositorio de ejemplos de código de AWS.

Añada una regla CORS.

import { PutBucketCorsCommand, S3Client } from "@aws-sdk/client-s3";

const client = new S3Client({});

// By default, Amazon S3 doesn't allow cross-origin requests. Use this command
// to explicitly allow cross-origin requests.
export const main = async () => {
  const command = new PutBucketCorsCommand({
    Bucket: "test-bucket",
    CORSConfiguration: {
      CORSRules: [
        {
          // Allow all headers to be sent to this bucket.
          AllowedHeaders: ["*"],
          // Allow only GET and PUT methods to be sent to this bucket.
          AllowedMethods: ["GET", "PUT"],
          // Allow only requests from the specified origin.
          AllowedOrigins: ["https://www.example.com"],
          // Allow the entity tag (ETag) header to be returned in the response. The ETag header
          // The entity tag represents a specific version of the object. The ETag reflects
          // changes only to the contents of an object, not its metadata.
          ExposeHeaders: ["ETag"],
          // How long the requesting browser should cache the preflight response. After
          // this time, the preflight request will have to be made again.
          MaxAgeSeconds: 3600,
        },
      ],
    },
  });

  try {
    const response = await client.send(command);
    console.log(response);
  } catch (err) {
    console.error(err);
  }
};
Python
SDK para Python (Boto3)
nota

Hay más en GitHub. Busque el ejemplo completo y aprenda a configurar y ejecutar en el Repositorio de ejemplos de código de AWS. 

class BucketWrapper:
    """Encapsulates S3 bucket actions."""

    def __init__(self, bucket):
        """
        :param bucket: A Boto3 Bucket resource. This is a high-level resource in Boto3
                       that wraps bucket actions in a class-like structure.
        """
        self.bucket = bucket
        self.name = bucket.name


    def put_cors(self, cors_rules):
        """
        Apply CORS rules to the bucket. CORS rules specify the HTTP actions that are
        allowed from other domains.

        :param cors_rules: The CORS rules to apply.
        """
        try:
            self.bucket.Cors().put(CORSConfiguration={"CORSRules": cors_rules})
            logger.info(
                "Put CORS rules %s for bucket '%s'.", cors_rules, self.bucket.name
            )
        except ClientError:
            logger.exception("Couldn't put CORS rules for bucket %s.", self.bucket.name)
            raise

  • Para obtener información sobre las API, consulte PutBucketCors en la Referencia de la API de AWS SDK para Python (Boto3).

Ruby
SDK para Ruby
nota

Hay más en GitHub. Busque el ejemplo completo y aprenda a configurar y ejecutar en el Repositorio de ejemplos de código de AWS. 

require "aws-sdk-s3"

# Wraps Amazon S3 bucket CORS configuration.
class BucketCorsWrapper
  attr_reader :bucket_cors

  # @param bucket_cors [Aws::S3::BucketCors] A bucket CORS object configured with an existing bucket.
  def initialize(bucket_cors)
    @bucket_cors = bucket_cors
  end

  # Sets CORS rules on a bucket.
  #
  # @param allowed_methods [Array<String>] The types of HTTP requests to allow.
  # @param allowed_origins [Array<String>] The origins to allow.
  # @returns [Boolean] True if the CORS rules were set; otherwise, false.
  def set_cors(allowed_methods, allowed_origins)
    @bucket_cors.put(
      cors_configuration: {
        cors_rules: [
          {
            allowed_methods: allowed_methods,
            allowed_origins: allowed_origins,
            allowed_headers: %w[*],
            max_age_seconds: 3600
          }
        ]
      }
    )
    true
  rescue Aws::Errors::ServiceError => e
    puts "Couldn't set CORS rules for #{@bucket_cors.bucket.name}. Here's why: #{e.message}"
    false
  end

end

  • Para obtener información sobre la API, consulte PutBucketCors en la Referencia de la API de AWS SDK for Ruby.

Para obtener una lista completa de las guías para desarrolladores del AWS SDK y ejemplos de código, consulte Uso de este servicio con un SDK de AWS. En este tema también se incluye información sobre cómo comenzar a utilizar el SDK y detalles sobre sus versiones anteriores.