ios - 亚马逊 AWS SNS : How do i subscribe to SNS topic from iOS?

Question

首先我发现了同样的问题here ，但它不起作用...也许 AWS SDK 更改或其他原因，我不知道为什么...我想从我的 iOS 应用程序订阅 SNS 主题。我正在尝试使用该答案中的代码来完成此操作，我试图对其进行更改以消除错误:

AWSSNS *sns = [AWSSNS defaultSNS];

    AWSSNSCreatePlatformEndpointInput *endpointRequest = [AWSSNSCreatePlatformEndpointInput new];

    endpointRequest.platformApplicationArn = @"arn:aws:sns:us-east-1:753780999999:app/APNS_SANDBOX/MyAppDevelopment";
    endpointRequest.token = [self deviceTokenAsString:deviceToken]; 

    [[[sns createPlatformApplication:endpointRequest] continueWithSuccessBlock:^id(AWSTask *task) {

        AWSSNSCreateEndpointResponse *response = task.result;

        AWSSNSSubscribeInput *subscribeRequest = [AWSSNSSubscribeInput new];

        subscribeRequest.endpoint = response.endpointArn;
        subscribeRequest.protocols = @"application";
        subscribeRequest.topicArn = @"arn:aws:sns:us-east-1:753780999999:MyAppDevelopingTest";

        return [sns subscribe:subscribeRequest];

    }] continueWithBlock:^id(AWSTask *task) {

        if (task.cancelled) {
            NSLog(@"Task cancelled");
        }

        else if (task.error) {
            NSLog(@"Error occurred: [%@]", task.error);
        }

        else {
            NSLog(@"Success");
        }

        return nil;

    }];

但是我得到了错误:

Error occurred: [Error Domain=com.amazonaws.AWSSNSErrorDomain Code=0 "The operation couldn’t be completed. (com.amazonaws.AWSSNSErrorDomain error 0.)" UserInfo=0x17ee0950 {Type=Sender, Message=3 validation errors detected: Value null at 'name' failed to satisfy constraint: Member must not be null; Value null at 'attributes' failed to satisfy constraint: Member must not be null; Value null at 'platform' failed to satisfy constraint: Member must not be null, __text=(
    "\n    ",
    "\n    ",
    "\n    ",
    "\n  "
), Code=ValidationError}]

为什么会这样？ app/is it ok 之后资源为什么就断了？除此之外我不明白我应该把deviceToken放在哪里？我真的需要帮助!提前致谢？

我的 Cognito 角色是:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "sns:CreatePlatformEndpoint",
                "sns:Subscribe",
                "sns:CreatePlatformApplication",
                "sns:*"
            ],
            "Resource": [
                "arn:aws:sns:*"
            ]
        }
    ]
}

我正在使用最新的 AWS 开发工具包:

Installing AWSCognito 2.2.1 (was 2.2.0)
Installing AWSCore 2.2.1 (was 2.2.0)
Installing AWSSNS 2.2.1 (was 2.2.0)

Answer 1

很抱歉，很遗憾，您复制的代码有错别字:

createPlatformApplication:endpointRequest

应该是:

createPlatformEndpoint:endpointRequest

您的原始政策不允许使用 CreatePlatformApplication 方法。允许 sns:* 后，服务允许调用，但请求不包含 CreatePlatformApplication 所需的参数，因此出现 ValidationError。原始消息中经过修剪的 ARN 也是缺少 CreatePlatformApplication 参数的结果。