使用共享访问密钥上载到Azure Blob存储

时间:2013-06-23 03:05:39

标签: c# azure azure-storage azure-storage-blobs

UPD:这是我的implemented solution to this problem

我正在尝试通过Azure.Storage库(不是REST API)上传到Azure blob存储,并通过共享访问密钥进行身份验证。

我见过这个blog post,但是自帖子以来API已经发生了变化,现在我无法得到相同的结果。

这就是我所拥有的:

var blobClient = new CloudBlobClient(new Uri(blobWithSas.BaseUri), new StorageCredentials(blobWithSas.Sas));


// here I receive 404 error
var blob = blobClient.GetBlobReferenceFromServer(new Uri(blobWithSas.AbsoluteUri));

using (var stream = new FileStream(fullFilePath, FileMode.Open))
{
    blob.UploadFromStream(stream);
}

拥有:

blobWithSas.BaseUri = http://127.0.0.1:10000/devstoreaccount1/a6dc9274-6ce1-4095-be6b-e84d1012cb24(Guid是容器的名称,已经存在,在其他地方创建。)

blobWithSas.Sas = ?sv=2012-02-12&se=2013-06-23T03%3A04%3A53Z&sr=b&sp=w&sig=NaMqgXRMXDFvLAp8LTskgplAKp%2B9LCZzq8WK9Zo35x8%3D(也在代码中的其他位置发布)

blobWithSas.AbsoluteUri = http://127.0.0.1:10000/devstoreaccount1/a6dc9274-6ce1-4095-be6b-e84d1012cb24/foldername/filename.txt

blob不存在,我想上传新文件并创建一个blob。我有“服务器”应用程序持有Azure存储帐户的访问密钥。服务器将向客户端发出SAS,客户端将文件直接上载到Azure。所以SAS只会写,没有阅读,客户端会创建服务器告诉他们的文件(容器,文件夹名称)

问题出现在GetBlobReferenceFromServer - 我从Azure存储中收到404错误。是的,blob不存在且没有引用。因此,给定CloudBlobClient,如何将文件上传到blob?

P.S。我意识到这些东西有REST API。但我之前使用过Microsoft.WindowsAzure.Storage库,如果可能的话,我希望避免使用REST服务。

1 个答案:

答案 0 :(得分:14)

  

问题出现在GetBlobReferenceFromServer上 - 我收到404错误   来自Azure存储。是的,blob不存在而且没有   参考。因此,给定CloudBlobClient,我如何将文件上传到   团块?

要使GetBlobReferenceFromServer生效,blob必须存在于Blob存储中。当您知道blob存在于存储中并且想要找出blob的类型 - Block BlobPage Blob时,这非常有用。

如果要通过从本地计算机上传文件来创建块blob,可以执行以下操作:

    var blob = new CloudBlockBlob(new Uri(blobWithSas.AbsoluteUri), new StorageCredentials(blobWithSas.Sas));
using (var stream = new FileStream(fullFilePath, FileMode.Open))
{
    blob.UploadFromStream(stream);
}

为了实现共享访问签名功能,我不久前写了一篇博客文章:http://gauravmantri.com/2013/02/13/revisiting-windows-azure-shared-access-signature/。您可以将其称为史蒂夫博客文章的第2版:)。我已经展示了使用REST API和Storage Client Library 2.0上传带有共享访问签名的Blob的示例。

博客文章中的一些代码示例:

使用Storage Client Library:

/// <summary>
/// Uploads a blob in a blob container where SAS permission is defined on a blob container using storage client library.
/// </summary>
/// <param name="blobContainerSasUri"></param>
static void UploadBlobWithStorageClientLibrarySasPermissionOnBlobContainer(string blobContainerSasUri)
{
    CloudBlobContainer blobContainer = new CloudBlobContainer(new Uri(blobContainerSasUri));
    CloudBlockBlob blob = blobContainer.GetBlockBlobReference("sample.txt");
    string sampleContent = "This is sample text.";
    using (MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(sampleContent)))
    {
        blob.UploadFromStream(ms);
    }
}

使用REST API:

/// <summary>
/// Uploads a blob in a blob container where SAS permission is defined on a blob container using REST API.
/// </summary>
/// <param name="blobContainerSasUri"></param>
static void UploadBlobWithRestAPISasPermissionOnBlobContainer(string blobContainerSasUri)
{
    string blobName = "sample.txt";
    string sampleContent = "This is sample text.";
    int contentLength = Encoding.UTF8.GetByteCount(sampleContent);
    string queryString = (new Uri(blobContainerSasUri)).Query;
    string blobContainerUri = blobContainerSasUri.Split('?')[0];
    string requestUri = string.Format(CultureInfo.InvariantCulture, "{0}/{1}{2}", blobContainerUri, blobName, queryString);
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(requestUri);
    request.Method = "PUT";
    request.Headers.Add("x-ms-blob-type", "BlockBlob");
    request.ContentLength = contentLength;
    using (Stream requestStream = request.GetRequestStream())
    {
        requestStream.Write(Encoding.UTF8.GetBytes(sampleContent), 0, contentLength);
    }
    using (HttpWebResponse resp = (HttpWebResponse)request.GetResponse())
    {

    }
}

您可能还会发现此博文有用:http://gauravmantri.com/2013/02/16/uploading-large-files-in-windows-azure-blob-storage-using-shared-access-signature-html-and-javascript/