[英]How can I use Amazon Web Services policy statement in my Java application?
我想從后端Java應用程序將Amazon SNS消息發送到Amazon SQS隊列 。 根據《 SNS開發人員指南》 ( http://docs.aws.amazon.com/sns/latest/dg/sns-dg.pdf ),在“將Amazon SNS消息發送到Amazon SQS隊列”部分中的主題- “步驟2.授予對Amazon SNS主題的權限,以將消息發送到Amazon SQS隊列” ,其寫為:
如果要自己創建策略文檔,則可以創建如下策略。 該策略允許MyTopic將消息發送到MyQueue。
{
"Version":"2012-10-17",
"Statement":[
{
"Sid":"MySQSPolicy001",
"Effect":"Allow",
"Principal":"*",
"Action":"sqs:SendMessage",
"Resource":"arn:aws:sqs:us-east-1:123456789012:MyQueue",
"Condition":{
"ArnEquals":{
"aws:SourceArn":"arn:aws:sns:us-east-1:123456789012:MyTopic"
}
}
}
]
}
我的疑問是如何在我的Java應用程序中使用此策略文檔(如果我沒有記錯的話,是.json文件),以及在哪里正確使用它? 因為我必須在隊列上設置一個策略,該策略允許Amazon SNS主題執行sqs:SendMessage操作。 TIA。
這是一個Java示例,用於創建SNS主題和SQS隊列,將SQS隊列訂閱到SNS主題,賦予SNS允許將消息發送到隊列,向SNS發送消息以及從隊列中讀取消息的權限。
import com.amazonaws.ClientConfiguration;
import com.amazonaws.auth.DefaultAWSCredentialsProviderChain;
import com.amazonaws.auth.policy.Condition;
import com.amazonaws.auth.policy.Policy;
import com.amazonaws.auth.policy.Principal;
import com.amazonaws.auth.policy.Resource;
import com.amazonaws.auth.policy.Statement;
import com.amazonaws.auth.policy.actions.SQSActions;
import com.amazonaws.regions.Region;
import com.amazonaws.regions.RegionUtils;
import com.amazonaws.services.sns.AmazonSNS;
import com.amazonaws.services.sns.AmazonSNSClient;
import com.amazonaws.services.sqs.AmazonSQS;
import com.amazonaws.services.sqs.AmazonSQSClient;
import com.amazonaws.services.sqs.model.CreateQueueRequest;
import com.amazonaws.services.sqs.model.Message;
import com.amazonaws.services.sqs.model.ReceiveMessageRequest;
import com.amazonaws.services.sqs.model.ReceiveMessageResult;
import com.amazonaws.services.sqs.model.SetQueueAttributesRequest;
import java.util.Arrays;
import java.util.Optional;
public class CreateSnsAndSqs {
private static final String SNS_TOPIC = "my-sns-topic";
private static final String SQS_NAME = "my-sqs-queue";
public static void main(String... argv) {
String regionName = Optional.ofNullable(System.getenv("AWS_DEFAULT_REGION")).orElse("us-east-1");
Region region = RegionUtils.getRegion(regionName);
ClientConfiguration clientConfiguration = new ClientConfiguration();
// AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY
DefaultAWSCredentialsProviderChain credentialsChain = new DefaultAWSCredentialsProviderChain();
AmazonSNS sns = region.createClient(AmazonSNSClient.class, credentialsChain, clientConfiguration);
AmazonSQS sqs = region.createClient(AmazonSQSClient.class, credentialsChain, clientConfiguration);
String sqsUrl = sqs.createQueue(new CreateQueueRequest(SQS_NAME)).getQueueUrl();
String snsTopicArn = sns.createTopic(SNS_TOPIC).getTopicArn();
String sqsArn = sqs.getQueueAttributes(sqsUrl, Arrays.asList("QueueArn")).getAttributes().get("QueueArn");
String sqsSubscriptionArn = sns.subscribe(snsTopicArn, "sqs", sqsArn).getSubscriptionArn();
Policy allowSnsToPostToSqsPolicy = new Policy("allow sns " + snsTopicArn + " to send to queue", Arrays.asList(
new Statement(Statement.Effect.Allow)
.withPrincipals(Principal.All)
.withActions(SQSActions.SendMessage)
.withResources(new Resource(sqsArn))
.withConditions(new Condition().withType("ArnEquals").withConditionKey("aws:SourceArn").withValues(snsTopicArn))
));
sqs.setQueueAttributes(new SetQueueAttributesRequest().withQueueUrl(sqsUrl).addAttributesEntry("Policy", allowSnsToPostToSqsPolicy.toJson()));
String sqsSubscriptionArn = sns.subscribe(snsTopicArn, "sqs", sqsArn).getSubscriptionArn();
sns.publish(snsTopicArn, "Hello world");
ReceiveMessageResult receiveResp = sqs.receiveMessage(new ReceiveMessageRequest(sqsUrl).withWaitTimeSeconds(10));
for (Message message: receiveResp.getMessages()) {
System.out.println("Received message " + message.getBody());
sqs.deleteMessage(sqsUrl, message.getReceiptHandle());
}
System.out.println("Deleting");
sns.deleteTopic(snsTopicArn);
sqs.deleteQueue(sqsUrl);
}
}
它將消息打印到控制台,如下所示:
Received message {
"Type" : "Notification",
"MessageId" : "add8d56a-19e6-5806-9424-9a2a796f8f94",
"TopicArn" : "arn:aws:sns:us-east-1:111111111111:my-sns-topic",
"Message" : "Hello world",
"Timestamp" : "2016-02-19T00:14:01.973Z",
"SignatureVersion" : "1",
"Signature" : "XXXaLONGSIGNATUREXXX",
"SigningCertURL" : "https://sns.us-east-1.amazonaws.com/SimpleNotificationService-bb750dd426d95ee9390147a5624348ee.pem",
"UnsubscribeURL" : "https://sns.us-east-1.amazonaws.com/?Action=Unsubscribe&SubscriptionArn=arn:aws:sns:us-east-1:111111111111:my-sns-topic:5e4d08a2-bcdb-4943-afef-5b7b02e30d5a"
}
Deleting
您不必在Java應用程序中執行此操作。
轉到AWS控制台,選擇IAM服務 ,選擇一個用戶(或創建一個用戶),然后在“權限”下附加“策略”。
它是這樣的:
可以從列表中選擇策略(JSON文檔),使用向導生成或手動輸入(這就是您想要的)。
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