Condivisione di oggetti utilizzando presigned URLs

L'esempio seguente genera un presigned URL che puoi dare ad altri in modo che possano recuperare un oggetto da un bucket S3 on Outposts. Per ulteriori informazioni, consulta Utilizzo di presigned URLs per S3 su Outposts. Per usare questo esempio, sostituisci il segnaposti di input dall'utente con le tue informazioni.

import com.amazonaws.AmazonServiceException;
import com.amazonaws.HttpMethod;
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.GeneratePresignedUrlRequest;

import java.io.IOException;
import java.net.URL;
import java.time.Instant;

public class GeneratePresignedURL {

    public static void main(String[] args) throws IOException {
        Regions clientRegion = Regions.DEFAULT_REGION;
        String accessPointArn = "*** access point ARN ***";
        String objectKey = "*** object key ***";

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

            // Set the presigned URL to expire after one hour.
            java.util.Date expiration = new java.util.Date();
            long expTimeMillis = Instant.now().toEpochMilli();
            expTimeMillis += 1000 * 60 * 60;
            expiration.setTime(expTimeMillis);

            // Generate the presigned URL.
            System.out.println("Generating pre-signed URL.");
            GeneratePresignedUrlRequest generatePresignedUrlRequest =
                    new GeneratePresignedUrlRequest(accessPointArn, objectKey)
                            .withMethod(HttpMethod.GET)
                            .withExpiration(expiration);
            URL url = s3Client.generatePresignedUrl(generatePresignedUrlRequest);

            System.out.println("Pre-Signed URL: " + url.toString());
        } 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();
        }
    }
}

L'esempio seguente genera un presigned URL che puoi dare ad altri in modo che possano recuperare un oggetto da un bucket S3 on Outposts. Per ulteriori informazioni, consulta Utilizzo di presigned URLs per S3 su Outposts. Per usare questo esempio, sostituisci il segnaposti di input dall'utente con le tue informazioni.

using Amazon;
using Amazon.S3;
using Amazon.S3.Model;
using System;

namespace Amazon.DocSamples.S3
{
    class GenPresignedURLTest
    {
        private const string accessPointArn = "*** access point ARN ***"; 
        private const string objectKey = "*** object key ***";
        // Specify how long the presigned URL lasts, in hours.
        private const double timeoutDuration = 12;
        // 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);
            string urlString = GeneratePreSignedURL(timeoutDuration);
        }
        static string GeneratePreSignedURL(double duration)
        {
            string urlString = "";
            try
            {
                GetPreSignedUrlRequest request1 = new GetPreSignedUrlRequest
                {
                    BucketName = accessPointArn,
                    Key = objectKey,
                    Expires = DateTime.UtcNow.AddHours(duration)
                };
                urlString = s3Client.GetPreSignedURL(request1);
            }
            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);
            }
            return urlString;
        }
    }
}