从 AWS 秘密调用中获取未定义的信息

Question

我已经看到这个问题了，但似乎没有人遇到和我一样的问题。我按照 AWS 文档并按照他们告诉我的方式实现了他们的代码，但我总是得到 undefined ？

这是代码：

// Load the AWS SDK
var AWS = require('aws-sdk'),
    region = "myRegion",
    secretName = "myARN",
    secret,
    decodedBinarySecret;

// Create a Secrets Manager client
var client = new AWS.SecretsManager({
    region: region
});

// In this sample we only handle the specific exceptions for the 'GetSecretValue' API.
// See https://docs.aws.amazon.com/secretsmanager/latest/apireference/API_GetSecretValue.html
// We rethrow the exception by default.

client.getSecretValue({SecretId: secretName}, function(err, data) {
    if (err) {
        if (err.code === 'DecryptionFailureException')
            // Secrets Manager can't decrypt the protected secret text using the provided KMS key.
            // Deal with the exception here, and/or rethrow at your discretion.
            throw err;
        else if (err.code === 'InternalServiceErrorException')
            // An error occurred on the server side.
            // Deal with the exception here, and/or rethrow at your discretion.
            throw err;
        else if (err.code === 'InvalidParameterException')
            // You provided an invalid value for a parameter.
            // Deal with the exception here, and/or rethrow at your discretion.
            throw err;
        else if (err.code === 'InvalidRequestException')
            // You provided a parameter value that is not valid for the current state of the resource.
            // Deal with the exception here, and/or rethrow at your discretion.
            throw err;
        else if (err.code === 'ResourceNotFoundException')
            // We can't find the resource that you asked for.
            // Deal with the exception here, and/or rethrow at your discretion.
            throw err;
    }
    else {
        // Decrypts secret using the associated KMS key.
        // Depending on whether the secret is a string or binary, one of these fields will be populated.
        if ('SecretString' in data) {
            let secret = data.SecretString;
            secret = JSON.parse(secret);
        } else {
            let buff = Buffer.from(data.SecretBinary, 'base64');
            decodedBinarySecret = buff.toString('ascii');
        }
    }
    
    // Your code goes here.
    // This is where undefined gets spit out
    console.log(decodedBinarySecret);
    console.log(secret);
});

一定有什么我遗漏/没有做的事情？

Answer 1

看起来，在条件语句的外部 else 部分中，您正在重新声明您也在最顶部声明​​的 secret 变量。该秘密变量获得一个值，但仅限于嵌套的 if 主体内部，而不是外部。这使得秘密变量仍然未定义。

另外，根据您的代码，变量 secret 将具有某个值或 decodedBinarySecret。其中之一将是未定义的。

尽量不要在主体内重新声明变量。请参阅下面的代码。

 else {
    // Decrypts secret using the associated KMS key.
    // Depending on whether the secret is a string or binary...
    if ('SecretString' in data) {
        secret = data.SecretString;
        secret = JSON.parse(secret);
    } else {
        let buff = Buffer.from(data.SecretBinary, 'base64');
        decodedBinarySecret = buff.toString('ascii');
    }
}