Question

我知道SDK版本1.x就像docs

一样简单

GeneratePresignedUrlRequest

然而，查看2.0 docs，但我无法找到int main() { int c; while ((c = getchar() != EOF)) { if (c == ' ' || c == '\n' || c == '\t') { printf("\n"); } else { putchar(c); } } }附近的任何内容。

希望还有另一个简单的模式吗？

Answer 1

S3的GetObject现在支持此功能。参见here。

  // Create an S3Presigner using the default region and credentials.
      // This is usually done at application startup, because creating a presigner can be expensive.
      S3Presigner presigner = S3Presigner.create();

      // Create a GetObjectRequest to be pre-signed
      GetObjectRequest getObjectRequest =
              GetObjectRequest.builder()
                              .bucket("my-bucket")
                              .key("my-key")
                              .build();

      // Create a GetObjectPresignRequest to specify the signature duration
      GetObjectPresignRequest getObjectPresignRequest =
          GetObjectPresignRequest.builder()
                                 .signatureDuration(Duration.ofMinutes(10))
                                 .getObjectRequest(request)
                                 .build();

      // Generate the presigned request
      PresignedGetObjectRequest presignedGetObjectRequest =
          presigner.presignGetObject(getObjectPresignRequest);

      // Log the presigned URL, for example.
      System.out.println("Presigned URL: " + presignedGetObjectRequest.url());

      // It is recommended to close the S3Presigner when it is done being used, because some credential
      // providers (e.g. if your AWS profile is configured to assume an STS role) require system resources
      // that need to be freed. If you are using one S3Presigner per application (as recommended), this
      // usually is not needed.
      presigner.close();

S3的PutObject现在也支持此功能。示例here。

S3Presigner presigner = S3Presigner.create();
PresignedPutObjectRequest presignedRequest =
    presigner.presignPutObject(r -> r.signatureDuration(Duration.ofMinutes(5))
                                        .putObjectRequest(por -> por.bucket(testBucket).key(objectKey)));

System.out.println("Pre-signed URL to upload a file to: " + 
                   presignedRequest.url());
System.out.println("Which HTTP method needs to be used when uploading a file: " + 
                   presignedRequest.httpRequest().method());
System.out.println("Which headers need to be sent with the upload: " + 
                   presignedRequest.signedHeaders())

以下是使用PresignedPutObjectRequest上传到S3的示例：

PresignedPutObjectRequest presignedRequest = ...;
SdkHttpClient httpClient = ApacheHttpClient.builder().build();

ContentStreamProvider contentToUpload = () -> new StringInputStream("Hello, World!");
HttpExecuteRequest uploadRequest = HttpExecuteRequest.builder()
                                                     .request(presignedRequest.httpRequest())
                                                     .contentStreamProvider(contentToUpload)
                                                     .build();

HttpExecuteResponse response = httpClient.prepareRequest(uploadRequest).call();
Validate.isTrue(response.httpResponse().isSuccessful());

Answer 2

正如@Anurudhha在评论中提到的那样，SDK 2.0尚不支持它。这是官方积压的链接

https://github.com/aws/aws-sdk-java-v2/projects/1

这是feature request的一种解决方法，目前可以为您提供帮助

https://gist.github.com/aaronanderson/f9e2806cc5e2c18fab4d7e60c589d160

AWS Java SDK 2.0为S3对象创建预签名URL

2 个答案: