如何使用 Azure 存储模拟器 blob 端点获取 blob？

Question

下面的代码，当指向一个真实的Azure存储账户时会成功return blob内容：

var path = $"{container}/{blob}";
var rfcDate = DateTime.UtcNow.ToString("R");
var headers =  "GET\n\n\n\n\n\n\n\n\n\n\n\n" +
               "x-ms-blob-type:Block\n" +
              $"x-ms-date:{rfcDate}\n" + 
              $"x-ms-version:{ServiceVersion}\n" +
              $"/{AccountName}/{path}";
var uri = new Uri(BlobEndpoint + path);
var request = new HttpRequestMessage(HttpMethod.Get, uri);
request.Headers.Add("x-ms-blob-type", "Block");
request.Headers.Add("x-ms-date", rfcDate);
request.Headers.Add("x-ms-version", ServiceVersion);

string signature = "";
using (var sha = new HMACSHA256(System.Convert.FromBase64String(AccountKey)))
{
  var data = Encoding.UTF8.GetBytes(headers);
  signature = System.Convert.ToBase64String(sha.ComputeHash(data));
}

var authHeader = $"SharedKey {AccountName}:{signature}";
request.Headers.Add("Authorization", authHeader);

using (var client = new HttpClient())
{
  var response = await client.SendAsync(request);
  return await response.Content.ReadAsStringAsync();
}

但是，如果我将其配置为使用 Azure 模拟器，其中：

账户名 = devstoreaccount1
帐号密钥 = Eby8vdM02xNOcqFlqUwJPLlmEtlCDXJ1OUzFT50uSRZ6IFsuFq2UVErCz4I6tq/K1SZFPTOtr/KBHBeksoGMGw==
BlobEndpoint = http://127.0.0.1:10000/
服务版本 = 2009-09-19

我总是收到 404。我使用的是 Azure 存储模拟器 v4.6。是代码或配置不正确还是模拟器不支持？

Answer 1

您的代码有两个问题：

存储模拟器中的 Blob 服务侦听 http://127.0.0.1:1000，但基本 URI 是 http://127.0.0.1:1000/devstoreaccount1。
在计算 Signature String（代码中的 header 变量）时，帐户名必须出现两次。这是因为帐户名称是资源 URI 路径的一部分（URL 对于 blob 将是 http://127.0.0.1:1000/devstoreaccount1/container-name/blob-name）。

基于这些，请尝试以下代码：

    static async Task<string> ReadBlobFromDevStorage()
    {
        var container = "temp";
        var blob = "test.txt";
        var ServiceVersion = "2009-09-19";
        var AccountName = "devstoreaccount1";
        var BlobEndpoint = "http://127.0.0.1:10000/devstoreaccount1";
        var path = $"{container}/{blob}";
        var AccountKey = "Eby8vdM02xNOcqFlqUwJPLlmEtlCDXJ1OUzFT50uSRZ6IFsuFq2UVErCz4I6tq/K1SZFPTOtr/KBHBeksoGMGw==";
        var rfcDate = DateTime.UtcNow.ToString("R");
        var headers = "GET\n\n\n\n\n\n\n\n\n\n\n\n" +
                       "x-ms-blob-type:Block\n" +
                      $"x-ms-date:{rfcDate}\n" +
                      $"x-ms-version:{ServiceVersion}\n" +
                      $"/{AccountName}/{AccountName}/{path}";
        var uri = new Uri(BlobEndpoint + "/" + path);
        var request = new HttpRequestMessage(HttpMethod.Get, uri);
        request.Headers.Add("x-ms-blob-type", "Block");
        request.Headers.Add("x-ms-date", rfcDate);
        request.Headers.Add("x-ms-version", ServiceVersion);

        string signature = "";
        using (var sha = new HMACSHA256(System.Convert.FromBase64String(AccountKey)))
        {
            var data = Encoding.UTF8.GetBytes(headers);
            signature = System.Convert.ToBase64String(sha.ComputeHash(data));
        }

        var authHeader = $"SharedKey {AccountName}:{signature}";
        request.Headers.Add("Authorization", authHeader);

        using (var client = new HttpClient())
        {
            var response = await client.SendAsync(request);
            var content = await response.Content.ReadAsStringAsync();
            Console.WriteLine(content);
            return content;
        }
    }

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