使用公共权限上传Amazon S3

Question

我正在使用Amazon C#SDK并尝试上传文件,但默认情况下它具有受限制的权限.我想公开发布,但我似乎无法找到如何在上传过程中执行此操作.

我的存储桶是公共的,但是当我使用下面的代码上传新文件时,我上传的文件不公开.

以前有人不得不这样做吗？

public class S3Uploader
{
    private string awsAccessKeyId;
    private string awsSecretAccessKey;
    private string bucketName;
    private Amazon.S3.Transfer.TransferUtility transferUtility;

    public S3Uploader(string bucketName)
    {
        this.bucketName = bucketName;
        this.transferUtility = new Amazon.S3.Transfer.TransferUtility("XXXXXXXXXXXXXXXXXX", "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX");

    }

    public void UploadFile(string filePath, string toPath)
    {
        AsyncCallback callback = new AsyncCallback(uploadComplete);
        transferUtility.BeginUpload(filePath, bucketName, toPath, callback, null);
    }

    private void uploadComplete(IAsyncResult result)
    { 
        var x = result;
    }
}

Answer 1

Tahbaza的解决方案是正确的,但它在AWS SDK(2.1 +)的更高版本中不起作用......

考虑在2.1+版本的SDK中使用以下内容:

private void UploadFileToS3(string filePath)
{
    var awsAccessKey = ConfigurationManager.AppSettings["AWSAccessKey"];
    var awsSecretKey = ConfigurationManager.AppSettings["AWSSecretKey"];
    var existingBucketName = ConfigurationManager.AppSettings["AWSBucketName"];
    var client = Amazon.AWSClientFactory.CreateAmazonS3Client(awsAccessKey, awsSecretKey,RegionEndpoint.USEast1);

    var uploadRequest = new TransferUtilityUploadRequest
    {
        FilePath = filePath,
        BucketName = existingBucketName,
        CannedACL = S3CannedACL.PublicRead
    };

var fileTransferUtility = new TransferUtility(client);
    fileTransferUtility.Upload(uploadRequest);
} 

Answer 2

找到它,需要使用一个TransferUtilityUploadRequest:

public class S3Uploader
{
    private string awsAccessKeyId;
    private string awsSecretAccessKey;
    private string bucketName;
    private Amazon.S3.Transfer.TransferUtility transferUtility;

    public S3Uploader(string bucketName)
    {
        this.bucketName = bucketName;
        this.transferUtility = new Amazon.S3.Transfer.TransferUtility("XXXXXXXXXXXXXXXXXX", "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX");

    }

    public void UploadFile(string filePath, string toPath)
    {
        AsyncCallback callback = new AsyncCallback(uploadComplete);
        var uploadRequest = new TransferUtilityUploadRequest();
        uploadRequest.FilePath = filePath;
        uploadRequest.BucketName = "my_s3_bucket";
        uploadRequest.Key = toPath;
        uploadRequest.AddHeader("x-amz-acl", "public-read");
        transferUtility.BeginUpload(uploadRequest, callback, null);
    }

    private void uploadComplete(IAsyncResult result)
    { 
        var x = result;
    }
}

Answer 3

我以前在C#中已经这样做了,但是你的库没有这样做(所以这可能是有限的帮助).

我们的想法是发送ACL标头和文件.

这是一种可以指向正确方向的方法.

这里还有一些指向相关AWS文档的链接.

    private const string AWS_ACL_HEADER = "x-amz-acl";

    private static string ToACLString(S3ACLType acl) {
        switch (acl) {
            case S3ACLType.AuthenticatedRead:
                return "authenticated-read";
            case S3ACLType.BucketOwnerFullControl:
                return "bucket-owner-full-control";
            case S3ACLType.BucketOwnerRead:
                return "bucket-owner-read";
            case S3ACLType.Private:
                return "private";
            case S3ACLType.PublicRead:
                return "public-read";
            case S3ACLType.PublicReadWrite:
                return "public-read-write";
            default: return "";
        }
    }

    public void Put(string bucketName, string id, byte[] bytes, string contentType, S3ACLType acl) {
        string uri = String.Format("https://{0}/{1}", BASE_SERVICE_URL, bucketName.ToLower());
        DreamMessage msg = DreamMessage.Ok(MimeType.BINARY, bytes);
        msg.Headers[DreamHeaders.CONTENT_TYPE] = contentType;
        msg.Headers[DreamHeaders.EXPECT] = "100-continue";
        msg.Headers[AWS_ACL_HEADER] = ToACLString(acl);
        Plug s3Client = Plug.New(uri).WithPreHandler(S3AuthenticationHeader);
        s3Client.At(id).Put(msg);
    }