Amazon S3 客户端无法下载带有空格或哈希的文件?

LP1*_*P13 5 amazon-s3 aws-sdk aws-sdk-net

我正在使用AWSSDK.S3版本3.3.17.2AWSSDK.Core版本3.3.21.16来上传文件,然后下载相同的文件。如果文件名包含空格( 或,下面的代码将无法下载该文件#

public class AmazonS3
{
    public async Task<string> UploadFileAsync(string sourceFile, string s3BucketUrl)
    {
        AmazonS3Uri s3Uri = new AmazonS3Uri(s3BucketUrl);
        using (var s3 = new AmazonS3Client(s3Uri.Region))
        {
            using (TransferUtility utility = new TransferUtility(s3))
            {
                TransferUtilityUploadRequest request = new TransferUtilityUploadRequest
                {
                    BucketName = s3Uri.Bucket,
                    ContentType = "application/pdf",
                    FilePath = sourceFile,
                    Key = s3Uri.Key + Path.GetFileName(sourceFile),
                };

                await utility.UploadAsync(request).ConfigureAwait(false);
            }
        }

        return Path.Combine(s3BucketUrl, Path.GetFileName(sourceFile));
    }  

    public async Task DownloadFileAsync(string destinationFilePath, string s3Url)
    {
        var s3Uri = new AmazonS3Uri(s3Url);
        var s3Client = new AmazonS3Client(s3Uri.Region);
        GetObjectRequest getObjectRequest = new GetObjectRequest
        {
            BucketName = s3Uri.Bucket,
            Key = s3Uri.Key
        };

        // dispose the underline stream when writing to local file system is done
        using (var getObjectResponse = await s3Client.GetObjectAsync(getObjectRequest).ConfigureAwait(false))
        {
            await getObjectResponse.WriteResponseStreamToFileAsync(destinationFilePath, false, default(System.Threading.CancellationToken)).ConfigureAwait(false);
        }
    }              
}
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然后出于测试目的,我上传文件并再次下载相同的文件

AmazonS3 s3 = new AmazonS3();

var uploadedFileS3Link = await s3.UploadFileAsync("C:\\temp\\my test file.pdf", @"https://mybucket.s3-us-west-2.amazonaws.com/development/test/");

// get exception at line below
await s3.DownloadFileAsync("C:\\temp\\downloaded file.pdf",uploadedFileS3Link );
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我遇到异常

Amazon.S3.AmazonS3Exception:指定的密钥不存在。---> Amazon.Runtime.Internal.HttpErrorResponseException:远程服务器返回错误:(404) Not Found。---> System.Net.WebException:远程服务器返回错误:(404) 未找到。at System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
at System.Threading.Tasks.TaskFactory 1.FromAsyncCoreLogic(IAsyncResult iar, Func2 endFunction, Action 1 endAction, Task1 Promise, Boolean requireSynchronization) --- 从先前抛出异常的位置开始的堆栈跟踪结束 --- 在 System. Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(任务任务)在……

为简洁起见,删除了剩余的例外情况

该文件确实存在于存储桶内。事实上,我可以复制并粘贴 s3url (即uploadedFileS3Link变量的值)并通过浏览器下载文件。

(请注意,实际上我正在尝试下载 1000 多个已上传且名称中带有空格的文件。因此,在上传时删除空格不是一个选项)

更新1 我注意到S3浏览器Url对文件名进行编码

在此输入图像描述

我尝试使用编码的文件路径下载文件https://mybucket.s3-us-west-2.amazonaws.com/development/test/my%20test%20file.pdf ,但仍然不起作用

LP1*_*P13 7

所以最后我发现了问题所在。我正在使用AmazonS3Uri类来解析给定的 S3 url 并获取密钥、存储桶和区域。返回AmazonS3Uri 我的密钥为development/test/my%20test%20file.pdf

因为内部AmazonS3Uri正在使用System.Uri构建 Uri 然后返回,AbsolutePath它返回编码路径作为键(它应该返回本地路径作为键吗?

我不知道为什么,但AmazonS3Client不喜欢它,如果你传递编码密钥,它会抛出异常。

因此,为了解决这个问题,我使用解码密钥System.Net.WebUtility.UrlDecode(s3Uri.Key)。所以新的下载方法看起来像

    public async Task DownloadFileAsync(string destinationFilePath, string s3Url)
    {
        var s3Uri = new S3UrlParser(s3Url);
        var s3Client = new AmazonS3Client(s3Uri.Region);
        GetObjectRequest getObjectRequest = new GetObjectRequest
        {
            BucketName = s3Uri.Bucket,
            Key = System.Net.WebUtility.UrlDecode(s3Uri.Key)
        };

        // dispose the underline stream when writing to local file system is done
        using (var getObjectResponse = await s3Client.GetObjectAsync(getObjectRequest).ConfigureAwait(false))
        {
            await getObjectResponse.WriteResponseStreamToFileAsync(destinationFilePath, false, default(System.Threading.CancellationToken)).ConfigureAwait(false);
        }
    }
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