TempCredExplicitSessionStartTest.cs

// Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: MIT-0 (For details, see https://github.com/awsdocs/amazon-s3-developer-guide/blob/master/LICENSE-SAMPLECODE.)

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

namespace Amazon.DocSamples.S3
{
    class TempCredExplicitSessionStartTest
    {
        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()
        {
            ListObjectsAsync().Wait();
        }

        private static async Task ListObjectsAsync()
        {
            try
            {
                // Credentials use the default AWS SDK for .NET credential search chain. 
                // On local development machines, this is your default profile.
                Console.WriteLine("Listing objects stored in a bucket");
                SessionAWSCredentials tempCredentials = await GetTemporaryCredentialsAsync();

                // Create a client by providing temporary security credentials.
                using (s3Client = new AmazonS3Client(tempCredentials, bucketRegion))
                {
                    var listObjectRequest = new ListObjectsRequest
                    {
                        BucketName = bucketName
                    };
                    // Send request to Amazon S3.
                    ListObjectsResponse response = await s3Client.ListObjectsAsync(listObjectRequest);
                    List<S3Object> objects = response.S3Objects;
                    Console.WriteLine("Object count = {0}", objects.Count);
                }
            }
            catch (AmazonS3Exception s3Exception)
            {
                Console.WriteLine(s3Exception.Message, s3Exception.InnerException);
            }
            catch (AmazonSecurityTokenServiceException stsException)
            {
                Console.WriteLine(stsException.Message, stsException.InnerException);
            }
        }

        private static async Task<SessionAWSCredentials> GetTemporaryCredentialsAsync()
        {
            using (var stsClient = new AmazonSecurityTokenServiceClient())
            {
                var getSessionTokenRequest = new GetSessionTokenRequest
                {
                    DurationSeconds = 7200 // seconds
                };

                GetSessionTokenResponse sessionTokenResponse =
                              await stsClient.GetSessionTokenAsync(getSessionTokenRequest);

                Credentials credentials = sessionTokenResponse.Credentials;

                var sessionCredentials =
                    new SessionAWSCredentials(credentials.AccessKeyId,
                                              credentials.SecretAccessKey,
                                              credentials.SessionToken);
                return sessionCredentials;
            }
        }
    }
}