如何阅读Amazon SNS JSON响应

Question

如何从Amazon SNS对http端点的响应中获取TranscriptionJobName和TranscriptionJobStatus？

当我在下面尝试我的代码时，文本文件中的name变量为空，但是来自Amazon的消息记录到我的file.txt中就可以了。

我从file.txt中的SNS得到什么（省略了一些值）：

Array
(
    [Type] => Notification
    [MessageId] => MSG_ID
    [TopicArn] => TOPIC_ARN
    [Message] => {"version":"0","id":"msg_id","detail-type":"Transcribe Job State Change","source":"aws.transcribe","account":"account_number","time":"2019-03-07T18:19:08Z","region":"us-east-1","resources":[],"detail":{"TranscriptionJobName":"702edfc","TranscriptionJobStatus":"COMPLETED"}}
    [Timestamp] => 2019-03-07T18:19:09.194Z
    [SignatureVersion] => 1
    [Signature] => sign==
    [SigningCertURL] => sign_cert.pem
    [UnsubscribeURL] => unsubscribe_url
)

我从namer.txt得到的结果是：

{

我的代码能够读取发送到端点的消息，但是尝试进一步解析为响应，将在我用来调试的txt文件中返回空白。

我的代码尝试：

    //Endpoint.php

 //Fetch the raw POST body containing the message
    $postBody = file_get_contents('php://input');

    // JSON decode the body to an array of message data
    $message = json_decode($postBody, true);


    if ($message) {

    //just for debugging put entire response in file.txt
    file_put_contents('file.txt', print_r($message, true));


    //if its a Notification 

    if ($message['Type'] === 'Notification'){

     //then get the name of the Transcription Job 

        $name = $message['Message']['detail'][0]['TranscriptionJobName'];

    //put that into namer.txt
        file_put_contents('namer.txt', $name,true);






                                }

    }

Answer 1

由于某种原因，似乎$message['Message']仍然是字符串而不是数组。

您需要先对其进行解码，然后才能访问其中的元素：

// Decode
$message['Message'] = json_decode($message['Message'], true);

// Now you can access it using:
$name = $message['Message']['detail']['TranscriptionJobName'];