配置跨源资源共享 (CORS)

有关设置和运行代码示例的信息，请参阅《适用于 .NET 的 AWS SDK 开发人员指南》中的适用于 .NET 的 AWS SDK 入门。

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()));
            }
        }
    }
}