[英]Set CORS on Windows Azure blob storage using ASP.NET
我正在尝试在我的Windows Azure blob存储帐户上设置CORS属性。 我正在使用ASP.NET服务器发送PUT请求。
服务器正在发回Forbidden响应,说“ 服务器无法验证请求。请确保正确形成Authorization标头的值,包括签名。 ”
所以它必须是我的身份验证标题中的内容。 以下是我用来获取标题的两个函数。
public string GetWindowsAzureAuthenticationHeader(string verb)
{
string stringToSign = String.Format("{0}\n"
+ "\n" // content encoding
+ "\n" // content language
+ "\n" // content length
+ "\n" // content md5
+ "\n" // content type
+ "\n" // date
+ "\n" // if modified since
+ "\n" // if match
+ "\n" // if none match
+ "\n" // if unmodified since
+ "\n" // range
+ "x-ms-date:" + DateTime.UtcNow.ToString("R") + "\nx-ms-version:2013-08-15\n" // headers
+ "/{1}\ncomp:properties\nrestype:service", verb, CloudConfig.StorageAccountName);
return SignThis(stringToSign, CloudConfig.StorageAccountKey, CloudConfig.StorageAccountName);
}
private string SignThis(string stringToSign, string key, string account)
{
string signature;
var unicodeKey = Convert.FromBase64String(key);
using (var hmacSha256 = new HMACSHA256(unicodeKey))
{
var dataToHmac = Encoding.UTF8.GetBytes(stringToSign);
signature = Convert.ToBase64String(hmacSha256.ComputeHash(dataToHmac));
}
String authorizationHeader = String.Format(
CultureInfo.InvariantCulture,
"{0} {1}:{2}",
"SharedKey",
account,
signature);
return authorizationHeader;
}
这是发送请求的控制器操作。 _mediaFactory.GetWindowsAzureCors方法使用我的CORS请求返回XML文件的内容。
var content = Encoding.UTF8.GetBytes(_mediaFactory.GetWindowsAzureCors(ControllerContext.HttpContext.Server));
var request = (HttpWebRequest)WebRequest.Create(CloudConfig.StorageAccountUri);
request.Method = "PUT";
request.Headers.Add("x-ms-date", DateTime.UtcNow.ToString("R"));
request.Headers.Add("x-ms-version", "2013-08-15");
request.ContentType = "text/plain; charset=UTF-8";
request.Host = string.Format("{0}.blob.core.windows.net", CloudConfig.StorageAccountName);
request.Headers.Add("Authorization", _mediaFactory.GetWindowsAzureAuthenticationHeader(request.Method));
request.GetRequestStream().Write(content, 0, content.Length);
using (var response = (HttpWebResponse) request.GetResponse())
{
model.StatusCode = response.StatusCode;
model.Response = response.StatusDescription;
}
我究竟做错了什么?
它实际上非常简单。
首先,在项目中添加对Azure Storage Client库的引用。 如果您正在使用Nuget,您要安装的软件包是WindowsAzure.Storage
。
之后,设置CORS设置的功能是SetServiceProperties
。 以下是执行此操作的示例代码:
CloudStorageAccount storageAccount = new CloudStorageAccount(new Microsoft.WindowsAzure.Storage.Auth.StorageCredentials(accountName, accountKey), true);
var 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 | ... Other Allowed Methods,
AllowedOrigins = new List<string>() {"http://yourdomain.com", "https://yourdomain.com", "blah", "blah", "blah"},
MaxAgeInSeconds = 3600,
});
blobClient.SetServiceProperties(blobServiceProperties);
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