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Azure Client-Side Binding
This demo illustrates how to use the custom file provider to connect the FileManager control to the Azure Blob Storage on the client side. The Custom File System Provider allows you to implement custom APIs to handle file operations (add, delete, rename, etc.). All APIs that implement access to Azure Blob Storage on the client are stored in the azure-file-system.js file. On the server, configure the Shared Access Signature (SAS) to grant access to blobs in the storage.
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@model DevExtreme.NETCore.Demos.Models.FileManagement.AzureStorageAccount
@if(!Model.IsEmpty()) {
@(Html.DevExtreme().FileManager()
.ID("file-manager")
.FileSystemProvider(provider => provider.Custom()
.GetItems("getItems")
.CreateDirectory("createDirectory")
.RenameItem("renameItem")
.DeleteItem("deleteItem")
.CopyItem("copyItem")
.MoveItem("moveItem")
.UploadFileChunk("uploadFileChunk")
.DownloadItems("downloadItems")
)
.Permissions(permissions => {
permissions.Download(true);
// uncomment the code below to enable file/folder management
// permissions.Create(true);
// permissions.Copy(true);
// permissions.Move(true);
// permissions.Delete(true);
// permissions.Rename(true);
// permissions.Upload(true);
})
.Upload(upload => upload.MaxFileSize(1048576))
.AllowedFileExtensions(new string[0])
)
<text>
<div id="request-panel"></div>
<script src="~/utils/azure-file-system.js"></script>
<script>
function getItems(parentDirectory) {
return azure.getItems(parentDirectory.path);
}
function createDirectory(parentDirectory, name) {
return azure.createDirectory(parentDirectory.path, name);
}
function renameItem(item, name) {
return item.isDirectory ? azure.renameDirectory(item.path, name) : azure.renameFile(item.path, name);
}
function deleteItem(item) {
return item.isDirectory ? azure.deleteDirectory(item.path) : azure.deleteFile(item.path);
}
function copyItem(item, destinationDirectory) {
var destinationPath = destinationDirectory.path ? destinationDirectory.path + "/" + item.name : item.name;
return item.isDirectory ? azure.copyDirectory(item.path, destinationPath) : azure.copyFile(item.path, destinationPath);
}
function moveItem(item, destinationDirectory) {
var destinationPath = destinationDirectory.path ? destinationDirectory.path + "/" + item.name : item.name;
return item.isDirectory ? azure.moveDirectory(item.path, destinationPath) : azure.moveFile(item.path, destinationPath);
}
function uploadFileChunk(fileData, uploadInfo, destinationDirectory) {
var deferred = null;
if(uploadInfo.chunkIndex === 0) {
var filePath = destinationDirectory.path ? destinationDirectory.path + "/" + fileData.name : fileData.name;
deferred = gateway.getUploadAccessUrl(filePath).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 downloadItems(items) {
azure.downloadFile(items[0].path);
}
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.RouteUrl("FileManagerAzureAccessApi")';
var gateway = new AzureGateway(endpointUrl, onRequestExecuted);
var azure = new AzureFileSystem(gateway);
</script>
</text>
}
else {
<text>
To run the demo locally, specify your Azure storage account name, access key and container name in the appsettings.json file.
Refer to the <a href="https://demos.devexpress.com/ASPNetCore/Demo/FileManager/AzureClientBinding/" target="_blank">
https://demos.devexpress.com/ASPNetCore/Demo/FileManager/AzureClientBinding/
</a> to see the demo online.
</text>
}
using DevExtreme.NETCore.Demos.Models.FileManagement;
using Microsoft.AspNetCore.Mvc;
namespace DevExtreme.NETCore.Demos.Controllers {
public class FileManagerController : Controller {
public IActionResult AzureClientBinding() {
return View(AzureStorageAccount.FileManager);
}
}
}
using DevExtreme.NETCore.Demos.Models.FileManagement;
using Microsoft.Azure.Storage;
using Microsoft.Azure.Storage.Auth;
using Microsoft.Azure.Storage.Blob;
using Microsoft.AspNetCore.Mvc;
using System;
namespace DevExtreme.NETCore.Demos.Controllers {
public class FileManagerAzureAccessApiController : Controller {
const string EmptyDirDummyBlobName = "aspxAzureEmptyFolderBlob";
const long MaxBlobSize = 1048576;
public FileManagerAzureAccessApiController() {
AllowDownload = true;
//uncomment the code below to enable file/folder management
//AllowCreate = true;
//AllowRemove = true;
//AllowRenameOrMoveOrCopy = true;
//AllowUpload = true;
}
bool AllowCreate { get; }
bool AllowRemove { get; }
bool AllowRenameOrMoveOrCopy { get; }
bool AllowUpload { get; }
bool AllowDownload { get; }
CloudBlobClient _client;
CloudBlobClient Client {
get {
if(this._client == null) {
AzureStorageAccount accountModel = AzureStorageAccount.FileManager;
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.FileManager;
this._container = Client.GetContainerReference(accountModel.ContainerName);
}
return this._container;
}
}
[Route("api/file-manager-azure-access", Name = "FileManagerAzureAccessApi")]
public object Process(string command, string blobName = null, string blobName2 = null) {
try {
return ProcessCommand(command, blobName, blobName2);
} catch {
return CreateErrorResult();
}
}
object ProcessCommand(string command, string blobName, string blobName2) {
switch(command) {
case "BlobList":
return GetBlobList();
case "CreateDirectory":
if(!AllowCreate)
return CreateErrorResult();
return CreateDirectory(blobName);
case "DeleteBlob":
if(!AllowRemove)
return CreateErrorResult();
return DeleteBlob(blobName);
case "CopyBlob":
if(!AllowRenameOrMoveOrCopy)
return CreateErrorResult();
return CopyBlob(blobName, blobName2);
case "UploadBlob":
if(!AllowUpload)
return CreateErrorResult();
return UploadBlob(blobName);
case "GetBlob":
if(!AllowDownload)
return CreateErrorResult();
return GetBlob(blobName);
}
return null;
}
object GetBlobList() {
var policy = CreateSharedAccessBlobPolicy(SharedAccessBlobPermissions.List);
string url = Container.Uri + Container.GetSharedAccessSignature(policy, null, SharedAccessProtocol.HttpsOnly, null);
return CreateSuccessResult(url);
}
object CreateDirectory(string directoryName) {
string blobName = $"{directoryName}/{EmptyDirDummyBlobName}";
CloudBlockBlob blob = Container.GetBlockBlobReference(blobName);
if(blob.Exists()) {
if(blob.Properties.Length > 0) {
blob.Delete();
}
return CreateErrorResult();
}
string url = GetSharedAccessSignature(blob, SharedAccessBlobPermissions.Write);
return CreateSuccessResult(url);
}
object DeleteBlob(string blobName) {
string url = GetSharedAccessSignature(blobName, SharedAccessBlobPermissions.Delete);
return CreateSuccessResult(url);
}
object CopyBlob(string sourceBlobName, string destinationBlobName) {
string sourceUrl = GetSharedAccessSignature(sourceBlobName, SharedAccessBlobPermissions.Read);
string destinationUrl = GetSharedAccessSignature(destinationBlobName, SharedAccessBlobPermissions.Create);
return CreateSuccessResult(sourceUrl, destinationUrl);
}
object UploadBlob(string blobName) {
if(blobName.EndsWith("/"))
return CreateErrorResult("Invalid blob name.");
CloudBlockBlob blob = Container.GetBlockBlobReference(blobName);
if(blob.Exists() && blob.Properties.Length > MaxBlobSize) {
blob.Delete();
return CreateErrorResult();
}
string url = GetSharedAccessSignature(blob, SharedAccessBlobPermissions.Write);
return CreateSuccessResult(url);
}
object GetBlob(string blobName) {
var headers = new SharedAccessBlobHeaders {
ContentType = "application/octet-stream"
};
string url = GetSharedAccessSignature(blobName, SharedAccessBlobPermissions.Read, headers);
return CreateSuccessResult(url);
}
string GetSharedAccessSignature(string blobName, SharedAccessBlobPermissions permissions, SharedAccessBlobHeaders headers = null) {
CloudBlockBlob blob = Container.GetBlockBlobReference(blobName);
return GetSharedAccessSignature(blob, permissions, headers);
}
string GetSharedAccessSignature(CloudBlockBlob blob, SharedAccessBlobPermissions permissions, SharedAccessBlobHeaders headers = null) {
SharedAccessBlobPolicy policy = CreateSharedAccessBlobPolicy(permissions);
return blob.Uri + blob.GetSharedAccessSignature(policy, headers, null, SharedAccessProtocol.HttpsOnly, null);
}
SharedAccessBlobPolicy CreateSharedAccessBlobPolicy(SharedAccessBlobPermissions permissions) {
return new SharedAccessBlobPolicy {
SharedAccessExpiryTime = DateTime.UtcNow.AddMinutes(1),
Permissions = permissions
};
}
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;
}