本文為英文版的機器翻譯版本，如內容有任何歧義或不一致之處，概以英文版為準。

# 使用由 S3 存取授權提供的憑證來存取 S3 資料
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承授者透過其存取授權[取得臨時憑證](https://docs.aws.amazon.com/AmazonS3/latest/userguide/access-grants-credentials.html)後，可以使用這些臨時憑證呼叫 Amazon S3 API 操作來存取您的資料。

承授者可以使用 S3 AWS Command Line Interface (AWS CLI)、 AWS SDKs和 Amazon S3 REST API 存取 S3 資料。此外，您可以使用 AWS [Python](https://github.com/aws/boto3-s3-access-grants-plugin) 和 [Java](https://github.com/aws/aws-s3-accessgrants-plugin-java-v2) 外掛程式來呼叫 S3 Access Grants

## 使用 AWS CLI
<a name="access-grants-get-data-cli"></a>

承授者從 S3 Access Grants 取得其臨時憑證後，就可以設定包含這些憑證的設定檔來擷取資料。

若要安裝 AWS CLI，請參閱*AWS Command Line Interface 《 使用者指南*[》中的安裝 AWS CLI](https://docs.aws.amazon.com/cli/latest/userguide/getting-started-install.html) 。

若要使用下列範例命令，請將 `{{user input placeholders}}` 取代為您自己的資訊。

**Example – 設定設定檔**  

```
aws configure set aws_access_key_id "{{$accessKey}}" --profile {{access-grants-consumer-access-profile}}
aws configure set aws_secret_access_key "{{$secretKey}}" --profile {{access-grants-consumer-access-profile}}
aws configure set aws_session_token "{{$sessionToken}}" --profile {{access-grants-consumer-access-profile}}
```

若要使用下列範例命令，請以您自己的資訊取代 `{{user input placeholders}}`。

**Example – 取得 S3 資料**  
承授者可以使用 [https://docs.aws.amazon.com/cli/latest/reference/s3api/get-object.html](https://docs.aws.amazon.com/cli/latest/reference/s3api/get-object.html) AWS CLI 命令來存取資料。承授者也可以使用 [https://docs.aws.amazon.com/cli/latest/reference/s3api/put-object.html](https://docs.aws.amazon.com/cli/latest/reference/s3api/put-object.html)、 [https://docs.aws.amazon.com/cli/latest/reference/s3/ls.html](https://docs.aws.amazon.com/cli/latest/reference/s3/ls.html)和其他 S3 AWS CLI 命令。  

```
aws s3api get-object \
--bucket {{amzn-s3-demo-bucket1}} \
--key {{myprefix}} \
--region {{us-east-2}} \
--profile {{access-grants-consumer-access-profile}}
```

## 使用 AWS SDKs
<a name="access-grants-get-data-using-sdk"></a>

本節提供承授者如何使用 AWS SDK 存取 S3 資料的範例。

------
#### [ Java ]

下列 Java 程式碼範例會從 S3 儲存貯體擷取物件。如需建立和測試可行範例的說明，請參閱《適用於 Java 的 AWS SDK 開發人員指南》**中的[入門](https://docs.aws.amazon.com/sdk-for-java/v1/developer-guide/getting-started.html)。

```
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.GetObjectRequest;
import com.amazonaws.services.s3.model.ResponseHeaderOverrides;
import com.amazonaws.services.s3.model.S3Object;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

public class GetObject2 {

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

        S3Object fullObject = null, objectPortion = null, headerOverrideObject = null;
        try {
            AmazonS3 s3Client = AmazonS3ClientBuilder.standard()
                    .withRegion(clientRegion)
                    .withCredentials(new ProfileCredentialsProvider())
                    .build();

            // Get an object and print its contents.
            System.out.println("Downloading an object");
            fullObject = s3Client.getObject(new GetObjectRequest(bucketName, key));
            System.out.println("Content-Type: " + fullObject.getObjectMetadata().getContentType());
            System.out.println("Content: ");
            displayTextInputStream(fullObject.getObjectContent());

            // Get a range of bytes from an object and print the bytes.
            GetObjectRequest rangeObjectRequest = new GetObjectRequest(bucketName, key)
                    .withRange(0, 9);
            objectPortion = s3Client.getObject(rangeObjectRequest);
            System.out.println("Printing bytes retrieved.");
            displayTextInputStream(objectPortion.getObjectContent());

            // Get an entire object, overriding the specified response headers, and print
            // the object's content.
            ResponseHeaderOverrides headerOverrides = new ResponseHeaderOverrides()
                    .withCacheControl("No-cache")
                    .withContentDisposition("attachment; filename=example.txt");
            GetObjectRequest getObjectRequestHeaderOverride = new GetObjectRequest(bucketName, key)
                    .withResponseHeaders(headerOverrides);
            headerOverrideObject = s3Client.getObject(getObjectRequestHeaderOverride);
            displayTextInputStream(headerOverrideObject.getObjectContent());
        } 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();
        } finally {
            // To ensure that the network connection doesn't remain open, close any open
            // input streams.
            if (fullObject != null) {
                fullObject.close();
            }
            if (objectPortion != null) {
                objectPortion.close();
            }
            if (headerOverrideObject != null) {
                headerOverrideObject.close();
            }
        }
    }

    private static void displayTextInputStream(InputStream input) throws IOException {
        // Read the text input stream one line at a time and display each line.
        BufferedReader reader = new BufferedReader(new InputStreamReader(input));
        String line = null;
        while ((line = reader.readLine()) != null) {
            System.out.println(line);
        }
        System.out.println();
    }
}
```

------

## S3 存取授權中支援的 S3 動作
<a name="access-grants-s3-actions"></a>

承授者可以使用由 S3 存取授權提供的臨時憑證，對其可存取的 S3 資料執行 S3 動作。以下是承授者可執行的允許 S3 動作清單。哪些動作是允許的，取決於存取授權中授予的許可層級 (`READ`、`WRITE` 或 `READWRITE`)。

**注意**  
除了下列 Amazon S3 許可之外，Amazon S3 還可以呼叫 AWS Key Management Service (AWS KMS) [Decrypt](https://docs.aws.amazon.com/kms/latest/APIReference/API_Decrypt.html) (`kms:decrypt`) `READ`許可或 AWS KMS [GenerateDataKey](https://docs.aws.amazon.com/kms/latest/APIReference/API_GenerateDataKey.html) (`kms:generateDataKey`) `WRITE`許可。這些許可不允許直接存取 AWS KMS 金鑰。


****  

| S3 IAM 動作 | API 動作與文件 | S3 存取授權許可 | S3 資源 | 
| --- | --- | --- | --- | 
| s3:GetObject | [GetObject](https://docs.aws.amazon.com/AmazonS3/latest/API/API_GetObject.html) | READ | 物件 | 
| s3:GetObjectVersion | [GetObject](https://docs.aws.amazon.com/AmazonS3/latest/API/API_GetObject.html) | READ | 物件 | 
| s3:GetObjectAcl | [GetObjectAcl](https://docs.aws.amazon.com/AmazonS3/latest/API/API_GetObjectAcl.html) | READ | 物件 | 
| s3:GetObjectVersionAcl | [GetObjectAcl](https://docs.aws.amazon.com/AmazonS3/latest/API/API_GetObjectAcl.html) | READ | 物件 | 
| s3:ListMultipartUploads | [ListParts](https://docs.aws.amazon.com/AmazonS3/latest/API/API_ListParts.html) | READ | 物件 | 
| s3:PutObject | [PutObject](https://docs.aws.amazon.com/AmazonS3/latest/API/API_PutObject.html)、[CreateMultipartUpload](https://docs.aws.amazon.com/AmazonS3/latest/API/API_CreateMultipartUpload.html)、[UploadPart](https://docs.aws.amazon.com/AmazonS3/latest/API/API_UploadPart.html)、[UploadPartCopy](https://docs.aws.amazon.com/AmazonS3/latest/API/API_UploadPartCopy.html)、[CompleteMultipartUpload](https://docs.aws.amazon.com/AmazonS3/latest/API/API_CompleteMultipartUpload.html) | WRITE | 物件 | 
| s3:PutObjectAcl | [PutObjectAcl](https://docs.aws.amazon.com/AmazonS3/latest/API/API_PutObjectAcl.html) | WRITE | 物件 | 
| s3:PutObjectVersionAcl | [PutObjectAcl](https://docs.aws.amazon.com/AmazonS3/latest/API/API_PutObjectAcl.html) | WRITE | 物件 | 
| s3:DeleteObject | [DeleteObject](https://docs.aws.amazon.com/AmazonS3/latest/API/API_DeleteObject.html) | WRITE | 物件 | 
| s3:DeleteObjectVersion | [DeleteObject](https://docs.aws.amazon.com/AmazonS3/latest/API/API_DeleteObject.html) | WRITE | 物件 | 
| s3:AbortMultipartUpload | [AbortMultipartUpload](https://docs.aws.amazon.com/AmazonS3/latest/API/API_AbortMultipartUpload.html) | WRITE | 物件 | 
| s3:ListBucket | [HeadBucket](https://docs.aws.amazon.com/AmazonS3/latest/API/API_HeadBucket.html)、[ListObjectsV2](https://docs.aws.amazon.com/AmazonS3/latest/API/API_ListObjectsV2.html)、[ListObjects](https://docs.aws.amazon.com/AmazonS3/latest/API/API_ListObjects.html) | READ | 儲存貯體 | 
| s3:ListBucketVersions | [ListObjectVersions](https://docs.aws.amazon.com/AmazonS3/latest/API/API_ListObjectVersions.html) | READ | 儲存貯體 | 
| s3:ListBucketMultipartUploads | [ListMultipartUploads](https://docs.aws.amazon.com/AmazonS3/latest/API/API_ListMultipartUploads.html) | READ | 儲存貯體 |