从 S3 下载文件时 AWS 令牌过期

Question

我正在尝试使用适用于 Android 的 AWS 开发工具包从我的 S3 存储桶下载文件。这是我正在使用的代码：

CognitoCachingCredentialsProvider credentialsProvider = new CognitoCachingCredentialsProvider(
            getApplicationContext(),
            "my identitiy pool id", // Identity Pool ID
            Regions.AP_NORTHEAST_1 // Region
    );

    AmazonS3 s3 = new AmazonS3Client(credentialsProvider);
    TransferUtility transferUtility = new TransferUtility(s3, getApplicationContext());

    TransferObserver observer = transferUtility.download(
            "mybucket",     /* The bucket to download from */
            "logo.png",    /* The key for the object to download */
            imageFile        /* The file to download the object to */
    );

此代码引发以下错误：

    E/DownloadTask: Failed to download: 8 due to The provided token has expired. (Service: Amazon S3; Status Code: 400; Error Code: ExpiredToken; Request ID: 6BEA65FAFAD54BF4)

我刚刚在 AWS Cognito 上创建了凭证，它不会过期。是不是我做错了什么？

Answer 1

这可能是一个临时问题。一段时间后我重试了，它成功了。