如何在Windows Azure中为Blob存储配置CORS设置 [英] How to configure CORS setting for Blob storage in windows azure

问题描述

我在azure存储中创建了几个容器，并且还向这些容器中上传了一些文件.现在，我需要授予对容器/blob的域级别访问权限.所以我从下面的代码级别尝试过.

I have created several containers in a azure storage and also uploaded some files into these containers. Now I need to give domain level access to the container/blobs. So I tried it from code level like below.

        CloudStorageAccount storageAccount = CloudStorageAccount.Parse(
        CloudConfigurationManager.GetSetting("StorageConnectionString"));

        CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
        ServiceProperties blobServiceProperties = new ServiceProperties();
            blobServiceProperties.Cors.CorsRules.Add(new CorsRule(){
                AllowedHeaders = new List<string>() {"*"},
                ExposedHeaders = new List<string>() {"*"},
                AllowedMethods = CorsHttpMethods.Post | CorsHttpMethods.Put | CorsHttpMethods.Get | CorsHttpMethods.Delete ,
                AllowedOrigins = new List<string>() { "http://localhost:8080/"},
                MaxAgeInSeconds = 3600,
            });

          blobClient.SetServiceProperties(GetBlobServiceProperties());  

但是，如果我从代码创建所有内容，则上述代码似乎可以工作(如果我错了，请纠正我).我也发现如下设置在这里，

But above code seems to be work if I am creating everything from code (Correct me if I am wrong). I also find setting like below Here,

 <CorsRule>
  <AllowedOrigins>http://www.contoso.com, http://www.fabrikam.com</AllowedOrigins>
  <AllowedMethods>PUT,GET</AllowedMethods>
  <AllowedHeaders>x-ms-meta-data*,x-ms-meta-target,x-ms-meta-source</AllowedHeaders>
  <ExposedHeaders>x-ms-meta-*</ExposedHeaders>
  <MaxAgeInSeconds>200</MaxAgeInSeconds>
</CorsRule>

但是我没弄清楚这段代码的位置.我的意思是在哪个文件中.或者，从天蓝色门户网站创建容器或Blob时，CORS是否有任何设置.请协助.任何帮助将是可观的.谢谢！

But I didn't get where this code have to put. I mean in which file. Or is there any setting for CORS while creating container or blob from azure portal. Please assist. Any help would be appreciable. Thanks!

推荐答案

以下内容回答了标题中实际提出的问题.似乎发问者已经从他的代码中很大程度上知道如何做到这一点，但这是我对此的答案.不幸的是，MS推出的代码示例远非易懂，因此我希望这对其他人有所帮助.在此解决方案中，您只需要一个CloudStorageAccount实例，您就可以从该实例开始调用此函数(作为扩展方法).

The following answers the question that was actually asked in the title. It appears the questioner already knew how to do this largely from his code, but here is my answer to this. Unfortunately the code samples MS has put out has been far from easy or clear, so I hope this helps someone else. In this solution all you need is a CloudStorageAccount instance, which you can call this function from then (as an extension method).

//用法:

        // -- example usage (in this case adding a wildcard CORS rule to this account --

        CloudStorageAccount acc = getYourStorageAccount();

        acc.SetCORSPropertiesOnBlobService(cors => {
            var wildcardRule = new CorsRule() { AllowedMethods = CorsHttpMethods.Get, AllowedOrigins = { "*" } };
            cors.CorsRules.Add(wildcardRule);
            return cors;
        });

//代码:

    /// <summary>
    /// Allows caller to replace or alter the current CorsProperties on a given CloudStorageAccount.
    /// </summary>
    /// <param name="storageAccount">Storage account.</param>
    /// <param name="alterCorsRules">The returned value will replace the 
    /// current ServiceProperties.Cors (ServiceProperties) value. </param>
    public static void SetCORSPropertiesOnBlobService(this CloudStorageAccount storageAccount,
        Func<CorsProperties, CorsProperties> alterCorsRules)
    {
        if (storageAccount == null || alterCorsRules == null) throw new ArgumentNullException();

        CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();

        ServiceProperties serviceProperties = blobClient.GetServiceProperties();

        serviceProperties.Cors = alterCorsRules(serviceProperties.Cors) ?? new CorsProperties();

        blobClient.SetServiceProperties(serviceProperties);
    }

考虑CorsRule类的属性可能会有所帮助:

It may be helpful to consider the properties of the CorsRule class:

        CorsRule corsRule = new CorsRule() {
            AllowedMethods = CorsHttpMethods.Get,       // Gets or sets the HTTP methods permitted to execute for this origin
            AllowedOrigins = { "*" },                   // (IList<string>) Gets or sets domain names allowed via CORS.
            //AllowedHeaders = { "*" },                 // (IList<string>) Gets or sets headers allowed to be part of the CORS request
            //ExposedHeaders = null,                    // (IList<string>) Gets or sets response headers that should be exposed to client via CORS
            //MaxAgeInSeconds = 33333                   // Gets or sets the length of time in seconds that a preflight response should be cached by browser
        };

这篇关于如何在Windows Azure中为Blob存储配置CORS设置的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！