設定跨來源資源共用（CORS）

跨來源資源共用（CORS）定義了將用戶端 Web 應用程式載入一個網域，以與不同網域中的資源互動的方式。透過 CORS支援，您可以使用 Amazon S3 建置豐富的用戶端 Web 應用程式，並選擇性地允許跨來源存取您的 Amazon S3 資源。

本節說明如何CORS使用 Amazon S3 主控台、Amazon S3 REST API和啟用 AWS SDKs。若要設定儲存貯體以允許跨來源請求，您可以將CORS組態新增至儲存貯體。CORS 組態是定義規則的文件，用於識別您將允許存取儲存貯體的原始伺服器、每個原始伺服器支援的操作（HTTP 方法），以及其他操作特定資訊。在 S3 主控台中，CORS組態必須是 JSON 文件。

如需 JSON和中的範例CORS組態XML，請參閱 CORS 組態的元素。

本節說明如何使用 Amazon S3 主控台將跨來源資源共用（CORS）組態新增至 S3 儲存貯體。

當您在儲存貯體CORS上啟用時，存取控制清單（ACLs）和其他存取許可政策會繼續套用。

重要

在 S3 主控台中，CORS組態必須為 JSON。如需 JSON和中的範例CORS組態XML，請參閱 CORS 組態的元素。

若要將CORS組態新增至 S3 儲存貯體

登入 AWS Management Console 並在開啟 Amazon S3 主控台https://console.aws.amazon.com/s3/。
在 Buckets (儲存貯體) 清單中，選擇要建立儲存貯體政策的儲存貯體名稱。
選擇 Permissions (許可)。
在跨來源資源共用（CORS） 區段中，選擇編輯。
在CORS組態編輯器文字方塊中，輸入或複製並貼上新CORS組態，或編輯現有組態。

CORS 組態是 JSON 檔案。您在編輯器中輸入的文字必須是有效的 JSON。如需詳細資訊，請參閱CORS 組態的元素。
選擇 Save changes (儲存變更)。

注意
Amazon S3 會在CORS組態編輯器標題旁顯示儲存貯體的 Amazon Resource Name （ARN）。如需的詳細資訊ARNs，請參閱中的 Amazon Resource Names （ARNs） AWS 和服務命名空間Amazon Web Services 一般參考。

您可以使用 AWS SDK來管理儲存貯體的跨來源資源共用（CORS）。如需的詳細資訊CORS，請參閱使用跨來源資源共用（CORS）。

請參閱以下範例：

建立CORS組態並在儲存貯體上設定組態
擷取組態與增加規則修改組態。
將經過修改的組態設定加入到儲存貯體中。
刪除組態

Java

如需如何建立和測試工作範例的說明，請參閱 AWS SDK for Java 開發人員指南中的入門。



import com.amazonaws.AmazonServiceException;
import com.amazonaws.SdkClientException;
import com.amazonaws.auth.profile.ProfileCredentialsProvider;
import com.amazonaws.regions.Regions;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3ClientBuilder;
import com.amazonaws.services.s3.model.BucketCrossOriginConfiguration;
import com.amazonaws.services.s3.model.CORSRule;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class CORS {

    public static void main(String[] args) throws IOException {
        Regions clientRegion = Regions.DEFAULT_REGION;
        String bucketName = "*** Bucket name ***";

        // Create two CORS rules.
        List<CORSRule.AllowedMethods> rule1AM = new ArrayList<CORSRule.AllowedMethods>();
        rule1AM.add(CORSRule.AllowedMethods.PUT);
        rule1AM.add(CORSRule.AllowedMethods.POST);
        rule1AM.add(CORSRule.AllowedMethods.DELETE);
        CORSRule rule1 = new CORSRule().withId("CORSRule1").withAllowedMethods(rule1AM)
                .withAllowedOrigins(Arrays.asList("http://*.example.com"));

        List<CORSRule.AllowedMethods> rule2AM = new ArrayList<CORSRule.AllowedMethods>();
        rule2AM.add(CORSRule.AllowedMethods.GET);
        CORSRule rule2 = new CORSRule().withId("CORSRule2").withAllowedMethods(rule2AM)
                .withAllowedOrigins(Arrays.asList("*")).withMaxAgeSeconds(3000)
                .withExposedHeaders(Arrays.asList("x-amz-server-side-encryption"));

        List<CORSRule> rules = new ArrayList<CORSRule>();
        rules.add(rule1);
        rules.add(rule2);

        // Add the rules to a new CORS configuration.
        BucketCrossOriginConfiguration configuration = new BucketCrossOriginConfiguration();
        configuration.setRules(rules);

        try {
            AmazonS3 s3Client = AmazonS3ClientBuilder.standard()
                    .withCredentials(new ProfileCredentialsProvider())
                    .withRegion(clientRegion)
                    .build();

            // Add the configuration to the bucket.
            s3Client.setBucketCrossOriginConfiguration(bucketName, configuration);

            // Retrieve and display the configuration.
            configuration = s3Client.getBucketCrossOriginConfiguration(bucketName);
            printCORSConfiguration(configuration);

            // Add another new rule.
            List<CORSRule.AllowedMethods> rule3AM = new ArrayList<CORSRule.AllowedMethods>();
            rule3AM.add(CORSRule.AllowedMethods.HEAD);
            CORSRule rule3 = new CORSRule().withId("CORSRule3").withAllowedMethods(rule3AM)
                    .withAllowedOrigins(Arrays.asList("http://www.example.com"));

            rules = configuration.getRules();
            rules.add(rule3);
            configuration.setRules(rules);
            s3Client.setBucketCrossOriginConfiguration(bucketName, configuration);

            // Verify that the new rule was added by checking the number of rules in the
            // configuration.
            configuration = s3Client.getBucketCrossOriginConfiguration(bucketName);
            System.out.println("Expected # of rules = 3, found " + configuration.getRules().size());

            // Delete the configuration.
            s3Client.deleteBucketCrossOriginConfiguration(bucketName);
            System.out.println("Removed CORS configuration.");

            // Retrieve and display the configuration to verify that it was
            // successfully deleted.
            configuration = s3Client.getBucketCrossOriginConfiguration(bucketName);
            printCORSConfiguration(configuration);
        } catch (AmazonServiceException e) {
            // The call was transmitted successfully, but Amazon S3 couldn't process
            // it, so it returned an error response.
            e.printStackTrace();
        } catch (SdkClientException e) {
            // Amazon S3 couldn't be contacted for a response, or the client
            // couldn't parse the response from Amazon S3.
            e.printStackTrace();
        }
    }

    private static void printCORSConfiguration(BucketCrossOriginConfiguration configuration) {
        if (configuration == null) {
            System.out.println("Configuration is null.");
        } else {
            System.out.println("Configuration has " + configuration.getRules().size() + " rules\n");

            for (CORSRule rule : configuration.getRules()) {
                System.out.println("Rule ID: " + rule.getId());
                System.out.println("MaxAgeSeconds: " + rule.getMaxAgeSeconds());
                System.out.println("AllowedMethod: " + rule.getAllowedMethods());
                System.out.println("AllowedOrigins: " + rule.getAllowedOrigins());
                System.out.println("AllowedHeaders: " + rule.getAllowedHeaders());
                System.out.println("ExposeHeader: " + rule.getExposedHeaders());
                System.out.println();
            }
        }
    }
}

.NET

如需設定和執行程式碼範例的相關資訊，請參閱適用於的 AWS SDK 中適用於的入門NETAWS SDK。NET 開發人員指南。


using Amazon;
using Amazon.S3;
using Amazon.S3.Model;
using System;
using System.Collections.Generic;
using System.Threading.Tasks;

namespace Amazon.DocSamples.S3
{
    class CORSTest
    {
        private const string bucketName = "*** bucket name ***";
        // Specify your bucket region (an example region is shown).
        private static readonly RegionEndpoint bucketRegion = RegionEndpoint.USWest2; 
        private static IAmazonS3 s3Client;

        public static void Main()
        {
            s3Client = new AmazonS3Client(bucketRegion);
            CORSConfigTestAsync().Wait();
        }
        private static async Task CORSConfigTestAsync()
        {
            try
            {
                // Create a new configuration request and add two rules    
                CORSConfiguration configuration = new CORSConfiguration
                {
                    Rules = new System.Collections.Generic.List<CORSRule>
                        {
                          new CORSRule
                          {
                            Id = "CORSRule1",
                            AllowedMethods = new List<string> {"PUT", "POST", "DELETE"},
                            AllowedOrigins = new List<string> {"http://*.example.com"}
                          },
                          new CORSRule
                          {
                            Id = "CORSRule2",
                            AllowedMethods = new List<string> {"GET"},
                            AllowedOrigins = new List<string> {"*"},
                            MaxAgeSeconds = 3000,
                            ExposeHeaders = new List<string> {"x-amz-server-side-encryption"}
                          }
                        }
                };

                // Add the configuration to the bucket. 
                await PutCORSConfigurationAsync(configuration);

                // Retrieve an existing configuration. 
                configuration = await RetrieveCORSConfigurationAsync();

                // Add a new rule.
                configuration.Rules.Add(new CORSRule
                {
                    Id = "CORSRule3",
                    AllowedMethods = new List<string> { "HEAD" },
                    AllowedOrigins = new List<string> { "http://www.example.com" }
                });

                // Add the configuration to the bucket. 
                await PutCORSConfigurationAsync(configuration);

                // Verify that there are now three rules.
                configuration = await RetrieveCORSConfigurationAsync();
                Console.WriteLine();
                Console.WriteLine("Expected # of rulest=3; found:{0}", configuration.Rules.Count);
                Console.WriteLine();
                Console.WriteLine("Pause before configuration delete. To continue, click Enter...");
                Console.ReadKey();

                // Delete the configuration.
                await DeleteCORSConfigurationAsync();

                // Retrieve a nonexistent configuration.
                configuration = await RetrieveCORSConfigurationAsync();
            }
            catch (AmazonS3Exception e)
            {
                Console.WriteLine("Error encountered on server. Message:'{0}' when writing an object", e.Message);
            }
            catch (Exception e)
            {
                Console.WriteLine("Unknown encountered on server. Message:'{0}' when writing an object", e.Message);
            }
        }

        static async Task PutCORSConfigurationAsync(CORSConfiguration configuration)
        {

            PutCORSConfigurationRequest request = new PutCORSConfigurationRequest
            {
                BucketName = bucketName,
                Configuration = configuration
            };

            var response = await s3Client.PutCORSConfigurationAsync(request);
        }

        static async Task<CORSConfiguration> RetrieveCORSConfigurationAsync()
        {
            GetCORSConfigurationRequest request = new GetCORSConfigurationRequest
            {
                BucketName = bucketName

            };
            var response = await s3Client.GetCORSConfigurationAsync(request);
            var configuration = response.Configuration;
            PrintCORSRules(configuration);
            return configuration;
        }

        static async Task DeleteCORSConfigurationAsync()
        {
            DeleteCORSConfigurationRequest request = new DeleteCORSConfigurationRequest
            {
                BucketName = bucketName
            };
            await s3Client.DeleteCORSConfigurationAsync(request);
        }

        static void PrintCORSRules(CORSConfiguration configuration)
        {
            Console.WriteLine();

            if (configuration == null)
            {
                Console.WriteLine("\nConfiguration is null");
                return;
            }

            Console.WriteLine("Configuration has {0} rules:", configuration.Rules.Count);
            foreach (CORSRule rule in configuration.Rules)
            {
                Console.WriteLine("Rule ID: {0}", rule.Id);
                Console.WriteLine("MaxAgeSeconds: {0}", rule.MaxAgeSeconds);
                Console.WriteLine("AllowedMethod: {0}", string.Join(", ", rule.AllowedMethods.ToArray()));
                Console.WriteLine("AllowedOrigins: {0}", string.Join(", ", rule.AllowedOrigins.ToArray()));
                Console.WriteLine("AllowedHeaders: {0}", string.Join(", ", rule.AllowedHeaders.ToArray()));
                Console.WriteLine("ExposeHeader: {0}", string.Join(", ", rule.ExposeHeaders.ToArray()));
            }
        }
    }
}

若要在儲存貯體上設定CORS組態，您可以使用 AWS Management Console。如果您的應用程式需要，您也可以直接傳送REST請求。Amazon Simple Storage Service API參考中的下列各節說明與CORS組態相關的RESTAPI動作：

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文件慣用形式

CORS 組態的元素

測試 CORS

設定跨來源資源共用 （CORS）

重要

若要將CORS組態新增至 S3 儲存貯體

注意

設定跨來源資源共用（CORS）