Direct Upload to Azure
The FileUploader widget supports direct-upload to blob storages. This demo illustrates how to configure the uploadChunk option to upload a large file directly to Azure Blob Storage without using a user's web server. All APIs that implement access to Azure Blob Storage on the client are stored in the azure-file-system.js file.
To implement file upload logic, use the uploadChunk option to specify how to process a connection request to the storage.
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@model DevExtreme.MVC.Demos.Models.FileManagement.AzureStorageAccount
@if(!Model.IsEmpty()) {
@(Html.DevExtreme().FileUploader()
.ID("file-uploader")
.ChunkSize(200000)
.MaxFileSize(1048576)
.UploadChunk("uploadChunk")
)
<text>
<div id="request-panel"></div>
<script src="~/Scripts/utils/azure-file-system.js"></script>
<script>
function uploadChunk(file, uploadInfo) {
var deferred = null;
if(uploadInfo.chunkIndex === 0) {
deferred = gateway.getUploadAccessUrl(file.name).done(function(accessUrl) {
uploadInfo.customData.accessUrl = accessUrl;
});
} else {
deferred = $.Deferred().resolve().promise();
}
deferred = deferred.then(function() {
return gateway.putBlock(uploadInfo.customData.accessUrl, uploadInfo.chunkIndex, uploadInfo.chunkBlob);
});
if(uploadInfo.chunkIndex === uploadInfo.chunkCount - 1) {
deferred = deferred.then(function() {
return gateway.putBlockList(uploadInfo.customData.accessUrl, uploadInfo.chunkCount);
});
}
return deferred.promise();
}
function onRequestExecuted(e) {
$("<div>").addClass("request-info").append(
createParameterInfoDiv("Method:", e.method),
createParameterInfoDiv("Url path:", e.urlPath),
createParameterInfoDiv("Query string:", e.queryString),
$("<br>")
)
.prependTo("#request-panel");
}
function createParameterInfoDiv(name, value) {
return $("<div>").addClass("parameter-info").append(
$("<div>").addClass("parameter-name").text(name),
$("<div>").addClass("parameter-value dx-theme-accent-as-text-color").text(value).attr("title", value)
);
}
var endpointUrl = '@Url.HttpRouteUrl("FileUploaderAzureAccessApi", null)';
var gateway = new AzureGateway(endpointUrl, onRequestExecuted);
</script>
</text>
}
else {
<text>
To run the demo locally, specify your Azure storage account name, access key and container name in the web.config file.
Refer to the <a href="https://js.devexpress.com/Demos/WidgetsGallery/Demo/FileUploader/AzureDirectUploading/Mvc/Light/" target="_blank">
https://js.devexpress.com/Demos/WidgetsGallery/Demo/FileUploader/AzureDirectUploading/Mvc/Light/
</a> to see the demo online.
</text>
}
using DevExtreme.MVC.Demos.Models.FileManagement;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Web;
using System.Web.Http.Results;
using System.Web.Mvc;
namespace DevExtreme.MVC.Demos.Controllers {
public class FileUploaderController : Controller {
public ActionResult AzureDirectUploading() {
return View(AzureStorageAccount.FileUploader.Value);
}
}
}
using DevExtreme.MVC.Demos.Models.FileManagement;
using Microsoft.Azure.Storage;
using Microsoft.Azure.Storage.Auth;
using Microsoft.Azure.Storage.Blob;
using System;
using System.Net.Http;
using System.Web.Http;
namespace DevExtreme.MVC.Demos.Controllers.ApiControllers {
public class FileUploaderAzureAccessApiController : ApiController {
const long MaxBlobSize = 1048576;
CloudBlobClient _client;
CloudBlobClient Client {
get {
if(this._client == null) {
AzureStorageAccount accountModel = AzureStorageAccount.FileUploader.Value;
var credentials = new StorageCredentials(accountModel.AccountName, accountModel.AccessKey);
var account = new CloudStorageAccount(credentials, true);
this._client = account.CreateCloudBlobClient();
}
return this._client;
}
}
CloudBlobContainer _container;
CloudBlobContainer Container {
get {
if(this._container == null) {
AzureStorageAccount accountModel = AzureStorageAccount.FileUploader.Value;
this._container = Client.GetContainerReference(accountModel.ContainerName);
}
return this._container;
}
}
[HttpGet]
[Route("api/file-uploader-azure-access", Name = "FileUploaderAzureAccessApi")]
public HttpResponseMessage Process(string command, string blobName) {
object result;
try {
result = UploadBlob(blobName);
} catch {
result = CreateErrorResult();
}
return Request.CreateResponse(result);
}
object UploadBlob(string blobName) {
if(blobName.Contains("/"))
return CreateErrorResult("Invalid blob name.");
string prefix = Guid.NewGuid().ToString("N");
string fullBlobName = $"{prefix}_{blobName}";
CloudBlockBlob blob = Container.GetBlockBlobReference(fullBlobName);
if(blob.Exists() && blob.Properties.Length > MaxBlobSize) {
blob.Delete();
return CreateErrorResult();
}
var policy = new SharedAccessBlobPolicy {
SharedAccessExpiryTime = DateTime.UtcNow.AddMinutes(1),
Permissions = SharedAccessBlobPermissions.Write
};
string url = blob.Uri + blob.GetSharedAccessSignature(policy, null, null, SharedAccessProtocol.HttpsOnly, null);
return CreateSuccessResult(url);
}
object CreateSuccessResult(string url, string url2 = null) {
return new {
success = true,
accessUrl = url,
accessUrl2 = url2
};
}
object CreateErrorResult(string error = null) {
if(string.IsNullOrEmpty(error))
error = "Unspecified error.";
return new {
success = false,
error = error
};
}
}
}
#request-panel {
min-width: 505px;
height: 400px;
overflow-x: hidden;
overflow-y: auto;
padding: 18px;
margin-top: 40px;
background-color: rgba(191, 191, 191, 0.15);
}
#request-panel .parameter-info {
display: flex;
}
.request-info .parameter-name {
flex: 0 0 100px;
}
.request-info .parameter-name,
.request-info .parameter-value {
overflow: hidden;
text-overflow: ellipsis;
white-space: nowrap;
}