將政策連接至 DynamoDB 現有資料表 - Amazon DynamoDB

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。

將政策連接至 DynamoDB 現有資料表

您可以使用 DynamoDB PutResourcePolicy 主控台、、 API或 AWS CLI AWS SDK AWS CloudFormation 範本 ，將資源型政策連接至現有資料表或修改現有政策。

下列IAM政策範例使用 put-resource-policy AWS CLI 命令，將資源型政策連接至現有資料表。此範例允許使用者 John 在名為 的現有資料表上執行 GetItem、UpdateItem、 PutItem和 UpdateTableAPI動作 MusicCollection.

請記得取代 italicized 包含資源特定資訊的文字。

aws dynamodb put-resource-policy \
    --resource-arn arn:aws:dynamodb:us-west-2:123456789012:table/MusicCollection \
    --policy \
        "{
            \"Version\": \"2012-10-17\",
            \"Statement\": [
              {
                    \"Effect\": \"Allow\",
                    \"Principal\": {
                        \"AWS\": \"arn:aws:iam::111122223333:user/John\"
                    },
                    \"Action\": [
                        \"dynamodb:GetItem\",
                        \"dynamodb:PutItem\",
                        \"dynamodb:UpdateItem\",
                        \"dynamodb:UpdateTable\"
                    ],
                    \"Resource\": \"arn:aws:dynamodb:us-west-2:123456789012:table/MusicCollection\"
                }
            ]
        }"

若要有條件更新資料表的現有資源型政策，您可以使用選用expected-revision-id參數。下列範例只有在 DynamoDB 中存在且其目前的修訂版 ID 符合提供的expected-revision-id參數時，才會更新政策。

aws dynamodb put-resource-policy \
    --resource-arn arn:aws:dynamodb:us-west-2:123456789012:table/MusicCollection \
    --expected-revision-id 1709841168699 \ 
    --policy \
        "{
            \"Version\": \"2012-10-17\",
            \"Statement\": [
              {
                    \"Effect\": \"Allow\",
                    \"Principal\": {
                        \"AWS\": \"arn:aws:iam::111122223333:user/John\"
                    },
                    \"Action\": [
                        \"dynamodb:GetItem\",
                        \"dynamodb:UpdateItem\",
                        \"dynamodb:UpdateTable\"
                    ],
                    \"Resource\": \"arn:aws:dynamodb:us-west-2:123456789012:table/MusicCollection\"
                }
            ]
        }"

  1. 登入 AWS Management Console 並在 開啟 DynamoDB 主控台https://console.aws.amazon.com/dynamodb/。

  2. 從儀表板中，選擇現有的資料表。

  3. 導覽至許可索引標籤，然後選擇建立資料表政策 。

  4. 在資源型政策編輯器中，新增您要連接的政策，然後選擇建立政策 。

    下列IAM政策範例允許使用者 John 在名為 的現有資料表上執行 GetItem、UpdateItem、 PutItem和 UpdateTableAPI動作 MusicCollection.

    請記得取代 italicized 包含資源特定資訊的文字。

    {
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": {
        "AWS": "arn:aws:iam::111122223333:user/John"
      },
      "Action": [
        "dynamodb:GetItem",
        "dynamodb:PutItem",
        "dynamodb:UpdateItem",
        "dynamodb:UpdateTable"
      ],
      "Resource": "arn:aws:dynamodb:us-west-2:123456789012:table/MusicCollection"
    }
  ]
}

下列IAM政策範例使用 putResourcePolicy方法將資源型政策連接至現有資料表。此政策允許使用者對現有資料表執行GetItemAPI動作。

import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.dynamodb.DynamoDbClient;
import software.amazon.awssdk.services.dynamodb.model.DynamoDbException;
import software.amazon.awssdk.services.dynamodb.model.PutResourcePolicyRequest;

/**
 * Before running this Java V2 code example, set up your development
 * environment, including your credentials.
 *
 * For more information, see the following documentation topic:
 *
 * Get started with the AWS SDK for Java 2.x
 */
public class PutResourcePolicy {

    public static void main(String[] args) {
        final String usage = """

                Usage:
                    <tableArn> <allowedAWSPrincipal>

                Where:
                    tableArn - The Amazon DynamoDB table ARN to attach the policy to. For example, arn:aws:dynamodb:us-west-2:123456789012:table/MusicCollection.
                    allowed AWS Principal - Allowed AWS principal ARN that the example policy will give access to. For example, arn:aws:iam::123456789012:user/John.
                """;

        if (args.length != 2) {
            System.out.println(usage);
            System.exit(1);
        }

        String tableArn = args[0];
        String allowedAWSPrincipal = args[1];
        System.out.println("Attaching a resource-based policy to the Amazon DynamoDB table with ARN " +
                tableArn);
        Region region = Region.US_WEST_2;
        DynamoDbClient ddb = DynamoDbClient.builder()
                .region(region)
                .build();

        String result = putResourcePolicy(ddb, tableArn, allowedAWSPrincipal);
        System.out.println("Revision ID for the attached policy is " + result);
        ddb.close();
    }

    public static String putResourcePolicy(DynamoDbClient ddb, String tableArn, String allowedAWSPrincipal) {
        String policy = generatePolicy(tableArn, allowedAWSPrincipal);
        PutResourcePolicyRequest request = PutResourcePolicyRequest.builder()
                .policy(policy)
                .resourceArn(tableArn)
                .build();

        try {
            return ddb.putResourcePolicy(request).revisionId();
        } catch (DynamoDbException e) {
            System.err.println(e.getMessage());
            System.exit(1);
        }

        return "";
    }

    private static String generatePolicy(String tableArn, String allowedAWSPrincipal) {
        return "{\n" +
                "    \"Version\": \"2012-10-17\",\n" +
                "    \"Statement\": [\n" +
                "        {\n" +
                "            \"Effect\": \"Allow\",\n" +
                "            \"Principal\": {\"AWS\":\"" + allowedAWSPrincipal + "\"},\n" +
                "            \"Action\": [\n" +
                "                \"dynamodb:GetItem\"\n" +
                "            ],\n" +
                "            \"Resource\": \"" + tableArn + "\"\n" +
                "        }\n" +
                "    ]\n" +
                "}";
    }
}