Question

当我尝试在Microsoft Flow中调用此https://docs.microsoft.com/en-us/rest/api/storageservices/get-blob-metadata API时，总是收到400错误请求的错误。

我编辑了关于此答案https://stackoverflow.com/a/22029178/10389562的授权标头，但无法理解我在做什么错。

Method: GET
Uri: https://myaccount.blob.core.windows.net/containername/blobname?comp=metadata
Headers :
{
  "Authorization": "SharedKey storageaccountname: primary key in the storage 
   account properties",
  "x-ms-date": "Thu, 21 Sep 2018 23:45:00 GMT",
  "x-ms-version": "2018-03-28"
}

调用此API后，我得到了此输出

<?xml version="1.0" encoding="utf-8"?><Error> 
<Code>InvalidAuthenticationInfo</Code><Message>Authentication information is 
not given in the correct format. Check the value of Authorization header.
RequestId:f3b3051b-601e-00a4-4b3c-51c58d000000
Time:2018-09-20T23:46:40.6659210Z</Message></Error>

感谢您的帮助

Answer 1

更新

在Microsoft Flow中，对Azure存储调用Rest Api似乎不是有效的方法。授权需要由流发送的x-ms- *标头（例如x-ms-tracking-id，x-ms-workflow-id等）添加到stringStr中，这不受我们的控制。而且，签名自生成以来仅有效15m。

有一个内置的Get Blob Metadata操作。对于存储，还可以使用其他常见操作。

要设置blob元数据，建议将逻辑托管在Azure函数中。

按照this tutorial创建Function应用程序和httptrigger函数，请记住选择要在其中设置blob元数据的存储帐户。

用下面的代码替换httptrigger示例，并根据需要修改metadataName。

#r "Microsoft.WindowsAzure.Storage"

using System.Net;
using Microsoft.WindowsAzure.Storage;
using Microsoft.WindowsAzure.Storage.Blob;

public static async Task<HttpResponseMessage> Run(HttpRequestMessage req, TraceWriter log)
{
    dynamic data = await req.Content.ReadAsAsync<object>();

    if (data == null)
    {
        return req.CreateResponse(HttpStatusCode.BadRequest, "No request body posted");
    }
    else
    {
        string metadata = data.metadata;
        string blobName = data.blobName;
        string containerName = data.containerName;

        try
        {
            CloudStorageAccount storageAccount = CloudStorageAccount.Parse(Environment.GetEnvironmentVariable("AzureWebJobsStorage"));
            CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
            CloudBlobContainer blobContainer = blobClient.GetContainerReference(containerName);
            CloudBlob blob = blobContainer.GetBlobReference(blobName);

            blob.Metadata.Add("metadataName", metadata);
            blob.SetMetadata();
        }
        catch (Exception e)
        {
            log.Error(e.ToString());
            return req.CreateResponse(HttpStatusCode.InternalServerError, "Fail to set metadata");
        }

        return (string.IsNullOrEmpty(metadata) || string.IsNullOrEmpty(blobName) || string.IsNullOrEmpty(containerName))
            ? req.CreateResponse(HttpStatusCode.BadRequest, "Please pass necessary parameters in the request body")
            : req.CreateResponse(HttpStatusCode.OK, $"Metadata of {blobName} has been set");
    }
}

在Microsoft Flow中，创建一个Http操作，将下面的内容发布到步骤2中获得的函数url中。
```
{
    "metadata": "test",
    "blobName":"myblob",
    "containerName":"mycontainer"
}
```

在Microsoft Flow中调用Azure Rest API时，未以正确的格式错误给出身份验证信息

1 个答案: