我阅读并实现了以下文章,用于在javascript客户端和azure blob存储之间分块文件:http://gauravmantri.com/2013/02/16/uploading-large-files-in-windows-azure-blob-storage-using-shared-access-signature-html-and-javascript。我似乎能够生成共享访问签名并创建权限,但是当我尝试使用以下SAS URL将块“突然”设置为azure时,我收到错误:“403(服务器无法验证请求确保正确形成Authorization标头的值,包括签名。)“。有人可以取悦我做错了什么。这是代码和网址和代码:
//sas url that is generated
http://testing.blob.core.windows.net/image-container?sr=c&si=Perms1&sig=UowbDVCLfFdiVktTZuoupj6BiMUzLRxF3WEZlXKMJcA%3D&comp=block&blockid=YmxvY2stMDAwMDAw
//Upload the blocks to azure storage
if (evt.target.readyState == FileReader.DONE) { // DONE == 2
var uri = submitUri + '&comp=block&blockid=' + blockIds[blockIds.length - 1];
var requestData = new Uint8Array(evt.target.result);
$.ajax({
url: uri,
type: "PUT",
data: requestData,
processData: false,
beforeSend: function(xhr) {
xhr.setRequestHeader('x-ms-blob-type', 'BlockBlob');
//xhr.setRequestHeader('Content-Length', requestData.length);
},
success: function (data, status) {
console.log(data);
console.log(status);
bytesUploaded += requestData.length;
var percentComplete = ((parseFloat(bytesUploaded) / parseFloat(selectedFile.size)) * 100).toFixed(2);
$("#fileUploadProgress").text(percentComplete + " %");
uploadFileInBlocks();
},
error: function(xhr, desc, err) {
console.log(desc);
console.log(err);
}
});
}
//Create stored access permissions
Microsoft.WindowsAzure.Storage.Blob.CloudBlobClient blobClient = _storageAccount.CreateCloudBlobClient();
//Get a reference to a container to use for the sample code, and create it if it does not exist.
Microsoft.WindowsAzure.Storage.Blob.CloudBlobContainer container = blobClient.GetContainerReference("images-container");
container.CreateIfNotExists();
//Create a new stored access policy and define its constraints.
Microsoft.WindowsAzure.Storage.Blob.SharedAccessBlobPolicy sharedPolicy = new Microsoft.WindowsAzure.Storage.Blob.SharedAccessBlobPolicy()
{
SharedAccessExpiryTime = DateTime.UtcNow.AddMinutes(10),
Permissions = Microsoft.WindowsAzure.Storage.Blob.SharedAccessBlobPermissions.Write
};
//Get the container's existing permissions.
Microsoft.WindowsAzure.Storage.Blob.BlobContainerPermissions permissions = container.GetPermissions();
//Add the new policy to the container's permissions.
if (!permissions.SharedAccessPolicies.ContainsKey(CloudConfiguration.GetConfigurationSetting("PolicyName")))
{
permissions.SharedAccessPolicies.Clear();
permissions.SharedAccessPolicies.Add(policyName, sharedPolicy);
container.SetPermissions(permissions);
}
//Generate the SAS Locator
CreateStoredAccessPolicy(CloudConfiguration.GetConfigurationSetting("PolicyName"));
//Create the blob client object.
Microsoft.WindowsAzure.StorageClient.CloudBlobClient blobClient = _storageAccount.CreateCloudBlobClient();
//Get a reference to a container to use for the sample code, and create it if it does not exist.
Microsoft.WindowsAzure.StorageClient.CloudBlobContainer container = blobClient.GetContainerReference("images-container");
//Set the expiry time and permissions for the container.
//In this case no start time is specified, so the shared access signature becomes valid immediately.
SharedAccessPolicy sasConstraints = new SharedAccessPolicy();
//Generate the shared access signature on the container, setting the constraints directly on the signature.
string sasContainerToken = container.GetSharedAccessSignature(sasConstraints, CloudConfiguration.GetConfigurationSetting("PolicyName"));
var newFileFile = Guid.NewGuid().ToString() + extension;
var blobUri = new UriBuilder(container.AbsoluteUri.ToString() + sasContainerToken);
// return the new VideoAsset
return new ImageAsset() { SasLocator = blobUri.AbsoluteUri.ToString(), NewFileName = newFileFile };
我目前正在本地计算机上的azure仿真器上以调试模式进行测试。不确定这是否是一个因素。
答案 0 :(得分:1)
在容器上建立存储的访问策略时,最多可能需要30秒才能生效。在此间隔期间,与存储的访问策略关联的共享访问签名将失败,状态码为403(禁止),直到访问策略变为活动状态。有关共享访问策略的详细信息,请查看 - https://msdn.microsoft.com/library/azure/dd179391.aspx。
因此,除了确保您正在生成如上所述的正确网址外,请确保在使用该政策之前等待30秒。
答案 1 :(得分:0)
即使您尝试上传块,生成的URL也指向容器。它还应包含类似http://testing.blob.core.windows.net/image-container/image-blob
的blob名称。