Azure Client-Side Binding
This demo illustrates how to use the custom file provider to connect the FileManager component 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 (app.service.ts - for Angular framework). On the server, configure the Shared Access Signature (SAS) to grant access to blobs in the storage.
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import React from 'react';
import FileManager, { Permissions } from 'devextreme-react/file-manager';
import CustomFileSystemProvider from 'devextreme/file_management/custom_provider';
import { LoadPanel } from 'devextreme-react/load-panel';
import { AzureGateway, AzureFileSystem } from './azure.file.system.js'; // eslint-disable-line import/no-unresolved
const endpointUrl = 'https://js.devexpress.com/Demos/Mvc/api/file-manager-azure-access';
const allowedFileExtensions = [];
const loadPanelPosition = { of: '#file-manager' };
class App extends React.Component {
constructor() {
super();
this.state = {
requests: [],
loadPanelVisible: true,
wrapperClassName: '',
};
this.onRequestExecuted = this.onRequestExecuted.bind(this);
gateway = new AzureGateway(endpointUrl, this.onRequestExecuted);
azure = new AzureFileSystem(gateway);
this.fileSystemProvider = new CustomFileSystemProvider({
getItems,
createDirectory,
renameItem,
deleteItem,
copyItem,
moveItem,
uploadFileChunk,
downloadItems,
});
this.checkAzureStatus();
}
render() {
return (
<div id="wrapper" className={this.state.wrapperClassName}>
<LoadPanel visible={this.state.loadPanelVisible} position={loadPanelPosition} />
<div id="widget-area">
<FileManager id="file-manager" fileSystemProvider={this.fileSystemProvider} allowedFileExtensions={allowedFileExtensions}>
<Permissions
download={true}>
</Permissions>
{/* uncomment the code below to enable file/directory management */}
{/* <Permissions
create={true}
copy={true}
move={true}
delete={true}
rename={true}
upload={true}
download={true}>
</Permissions> */}
</FileManager>
<div id="request-panel">
{
this.state.requests.map((r, i) => <div key={i} className="request-info">
<div className="parameter-info">
<div className="parameter-name">Method:</div>
<div className="parameter-value dx-theme-accent-as-text-color">{r.method}</div>
</div>
<div className="parameter-info">
<div className="parameter-name">Url path:</div>
<div className="parameter-value dx-theme-accent-as-text-color">{r.urlPath}</div>
</div>
<div className="parameter-info">
<div className="parameter-name">Query string:</div>
<div className="parameter-value dx-theme-accent-as-text-color">{r.queryString}</div>
</div>
<br />
</div>)
}
</div>
</div>
<div id="message-box">
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/FileManager/AzureClientBinding/React/Light/"
target="_blank" rel="noopener noreferrer">
https://js.devexpress.com/Demos/WidgetsGallery/Demo/FileManager/AzureClientBinding/React/Light/</a>
to see the demo online.
</div>
</div>
);
}
checkAzureStatus() {
fetch('https://js.devexpress.com/Demos/Mvc/api/file-manager-azure-status?widgetType=fileManager')
.then((response) => response.json())
.then((result) => {
const className = result.active ? 'show-widget' : 'show-message';
this.setState({
wrapperClassName: className,
loadPanelVisible: false,
});
});
}
onRequestExecuted({ method, urlPath, queryString }) {
const request = { method, urlPath, queryString };
this.setState({ requests: [request, ...this.state.requests] });
}
}
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) {
const 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) {
const 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) {
let promise = null;
if (uploadInfo.chunkIndex === 0) {
const filePath = destinationDirectory.path ? `${destinationDirectory.path}/${fileData.name}` : fileData.name;
// eslint-disable-next-line spellcheck/spell-checker
promise = gateway.getUploadAccessUrl(filePath).then((accessUrls) => {
// eslint-disable-next-line spellcheck/spell-checker
uploadInfo.customData.accessUrl = accessUrls.url1;
});
} else {
promise = Promise.resolve();
}
promise = promise.then(() => gateway.putBlock(
uploadInfo.customData.accessUrl,
uploadInfo.chunkIndex,
uploadInfo.chunkBlob,
));
if (uploadInfo.chunkIndex === uploadInfo.chunkCount - 1) {
promise = promise.then(() => gateway.putBlockList(
uploadInfo.customData.accessUrl,
uploadInfo.chunkCount,
));
}
return promise;
}
function downloadItems(items) {
azure.downloadFile(items[0].path);
}
let gateway = null;
let azure = null;
export default App;
import React from 'react';
import ReactDOM from 'react-dom';
import App from './App.js';
ReactDOM.render(
<App />,
document.getElementById('app'),
);
<!DOCTYPE html>
<html>
<head>
<title>DevExtreme Demo</title>
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/22.2.6/css/dx.light.css" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/22.2.6/css/dx-gantt.min.css" />
<link rel="stylesheet" type="text/css" href="styles.css" />
<script src="https://unpkg.com/core-js@2.6.12/client/shim.min.js"></script>
<script src="https://unpkg.com/systemjs@0.21.3/dist/system.js"></script>
<script type="text/javascript" src="config.js"></script>
<script type="text/javascript">
System.import("./index.js");
</script>
</head>
<body class="dx-viewport">
<div class="demo-container">
<div id="app"></div>
</div>
</body>
</html>
#widget-area {
visibility: hidden;
}
#message-box {
display: none;
}
.show-widget #widget-area {
visibility: visible;
}
.show-message #widget-area {
display: none;
}
.show-message #message-box {
display: block;
}
#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;
}
export class AzureFileSystem {
constructor(azureGateway) {
this.gateway = azureGateway;
this.EMPTY_DIR_DUMMY_BLOB_NAME = 'aspxAzureEmptyFolderBlob';
}
getItems(path) {
var prefix = this.getDirectoryBlobName(path);
return this.gateway.getBlobList(prefix).then((entries) => this.getDataObjectsFromEntries(entries, prefix));
}
createDirectory(path, name) {
var blobName = path ? `${path}/${name}` : name;
return this.gateway.createDirectoryBlob(blobName);
}
renameFile(path, name) {
var newPath = this.getPathWithNewName(path, name);
return this.moveFile(path, newPath);
}
renameDirectory(path, name) {
var newPath = this.getPathWithNewName(path, name);
return this.moveDirectory(path, newPath);
}
getPathWithNewName(path, name) {
var parts = path.split('/');
parts[parts.length - 1] = name;
return parts.join('/');
}
deleteFile(path) {
return this.gateway.deleteBlob(path);
}
deleteDirectory(path) {
var prefix = this.getDirectoryBlobName(path);
return this.executeActionForEachEntry(prefix, (entry) => this.gateway.deleteBlob(entry.name));
}
copyFile(sourcePath, destinationPath) {
return this.gateway.copyBlob(sourcePath, destinationPath);
}
copyDirectory(sourcePath, destinationPath) {
var prefix = this.getDirectoryBlobName(sourcePath);
var destinationKey = this.getDirectoryBlobName(destinationPath);
return this.executeActionForEachEntry(prefix, (entry) => this.copyEntry(entry, prefix, destinationKey));
}
copyEntry(entry, sourceKey, destinationKey) {
var restName = entry.name.substr(sourceKey.length);
var newDestinationKey = destinationKey + restName;
return this.gateway.copyBlob(entry.name, newDestinationKey);
}
moveFile(sourcePath, destinationPath) {
return this.gateway.copyBlob(sourcePath, destinationPath).then(() => this.gateway.deleteBlob(sourcePath));
}
moveDirectory(sourcePath, destinationPath) {
var prefix = this.getDirectoryBlobName(sourcePath);
var destinationKey = this.getDirectoryBlobName(destinationPath);
return this.executeActionForEachEntry(prefix, (entry) => this.copyEntry(entry, prefix, destinationKey).then(() => this.gateway.deleteBlob(entry.name)));
}
downloadFile(path) {
this.gateway.getBlobUrl(path).then((accessUrls) => {
window.location.href = accessUrls.url1;
});
}
executeActionForEachEntry(prefix, action) {
return this.gateway.getBlobList(prefix).then((entries) => {
var deferreds = entries.map((entry) => action(entry));
return Promise.all(deferreds);
});
}
getDataObjectsFromEntries(entries, prefix) {
var result = [];
var directories = {};
entries.forEach((entry) => {
var restName = entry.name.substr(prefix.length);
var parts = restName.split('/');
if (parts.length === 1) {
if (restName !== this.EMPTY_DIR_DUMMY_BLOB_NAME) {
var obj = {
name: restName,
isDirectory: false,
dateModified: entry.lastModified,
size: entry.length,
};
result.push(obj);
}
}
else {
var dirName = parts[0];
var directory = directories[dirName];
if (!directory) {
directory = {
name: dirName,
isDirectory: true,
};
directories[dirName] = directory;
result.push(directory);
}
if (!directory.hasSubDirectories) {
directory.hasSubDirectories = parts.length > 2;
}
}
});
result.sort(this.compareDataObjects);
return result;
}
compareDataObjects(obj1, obj2) {
if (obj1.isDirectory === obj2.isDirectory) {
var name1 = obj1.name.toLowerCase();
var name2 = obj2.name.toLowerCase();
if (name1 < name2) {
return -1;
}
return name1 > name2 ? 1 : 0;
}
return obj1.isDirectory ? -1 : 1;
}
getDirectoryBlobName(path) {
return path ? `${path}/` : path;
}
}
export class AzureGateway {
constructor(endpointUrl, onRequestExecuted) {
this.endpointUrl = endpointUrl;
this.onRequestExecuted = onRequestExecuted;
}
getBlobList(prefix) {
return this.getAccessUrl('BlobList')
.then((accessUrls) => this.executeBlobListRequest(accessUrls.url1, prefix))
.then((xml) => this.parseEntryListResult(xml));
}
parseEntryListResult(xmlString) {
var xml = new DOMParser().parseFromString(xmlString, 'text/xml');
return Array.from(xml.querySelectorAll('Blob')).map(this.parseEntry);
}
parseEntry(xmlEntry) {
var entry = {};
entry.etag = xmlEntry.querySelector('Etag').textContent;
entry.name = xmlEntry.querySelector('Name').textContent;
var dateStr = xmlEntry.querySelector('Last-Modified').textContent;
entry.lastModified = new Date(dateStr);
var lengthStr = xmlEntry.querySelector('Content-Length').textContent;
entry.length = parseInt(lengthStr, 10);
return entry;
}
executeBlobListRequest(accessUrl, prefix) {
var params = {
restype: 'container',
comp: 'list',
};
if (prefix) {
params.prefix = prefix;
}
return this.executeRequest(accessUrl, params);
}
createDirectoryBlob(name) {
return this.getAccessUrl('CreateDirectory', name).then((accessUrls) => this.executeRequest({
url: accessUrls.url1,
method: 'PUT',
headers: {
'x-ms-blob-type': 'BlockBlob',
},
processData: false,
contentType: false,
}));
}
deleteBlob(name) {
return this.getAccessUrl('DeleteBlob', name).then((accessUrls) => this.executeRequest({
url: accessUrls.url1,
method: 'DELETE',
}));
}
copyBlob(sourceName, destinationName) {
return this.getAccessUrl('CopyBlob', sourceName, destinationName).then((accessUrls) => this.executeRequest({
url: accessUrls.url2,
method: 'PUT',
headers: {
'x-ms-copy-source': accessUrls.url1,
},
}));
}
putBlock(uploadUrl, blockIndex, blockBlob) {
var blockId = this.getBlockId(blockIndex);
var params = {
comp: 'block',
blockid: blockId,
};
return this.executeRequest({
url: uploadUrl,
method: 'PUT',
data: blockBlob,
processData: false,
contentType: false,
}, params);
}
putBlockList(uploadUrl, blockCount) {
var content = this.getBlockListContent(blockCount);
var params = {
comp: 'blocklist',
};
return this.executeRequest({
url: uploadUrl,
method: 'PUT',
data: content,
}, params);
}
getBlockListContent(blockCount) {
var contentParts = [
'<?xml version="1.0" encoding="utf-8"?>',
'<BlockList>',
];
for (var i = 0; i < blockCount; i++) {
var blockContent = ` <Latest>${this.getBlockId(i)}</Latest>`;
contentParts.push(blockContent);
}
contentParts.push('</BlockList>');
return contentParts.join('\n');
}
getBlockId(blockIndex) {
var res = `${blockIndex}`;
while (res.length < 10) {
res = `0${res}`;
}
return btoa(res);
}
getUploadAccessUrl(blobName) {
return this.getAccessUrl('UploadBlob', blobName);
}
getBlobUrl(blobName) {
return this.getAccessUrl('GetBlob', blobName);
}
getAccessUrl(command, blobName, blobName2) {
var url = `${this.endpointUrl}?command=${command}`;
if (blobName) {
url += `&blobName=${encodeURIComponent(blobName)}`;
}
if (blobName2) {
url += `&blobName2=${encodeURIComponent(blobName2)}`;
}
// eslint-disable-next-line no-async-promise-executor
return new Promise(async (resolve, reject) => {
await this.executeRequest(url).then((x) => {
if (x.success) {
resolve({ url1: x.accessUrl, url2: x.accessUrl2 });
}
else {
reject(x.error);
}
});
});
}
executeRequest(args, commandParams) {
var ajaxArgs = typeof args === 'string' ? { url: args } : args;
var method = ajaxArgs.method || 'GET';
var urlParts = ajaxArgs.url.split('?');
var urlPath = urlParts[0];
var restQueryString = urlParts[1];
var commandQueryString = commandParams
? this.getQueryString(commandParams)
: '';
var queryString = commandQueryString || '';
if (restQueryString) {
queryString += queryString ? `&${restQueryString}` : restQueryString;
}
ajaxArgs.url = queryString ? `${urlPath}?${queryString}` : urlPath;
return fetch(ajaxArgs.url, ajaxArgs)
.then((x) => {
var eventArgs = {
method,
urlPath,
queryString,
};
if (this.onRequestExecuted) {
this.onRequestExecuted(eventArgs);
}
return x;
})
.then(async (x) => {
if (x.status === 200) {
var text = await x.text();
try {
return Object.assign({ success: true }, JSON.parse(text));
}
catch (ex) {
return text;
}
}
else {
return { error: x.statusText };
}
});
}
getQueryString(params) {
return Object.keys(params)
.map((key) => `${key}=${encodeURIComponent(params[key])}`)
.join('&');
}
}
window.config = {
transpiler: 'plugin-babel',
meta: {
'devextreme/localization.js': {
'esModule': true,
},
},
paths: {
'npm:': 'https://unpkg.com/',
},
defaultExtension: 'js',
map: {
'react': 'npm:react@17.0.2/umd/react.development.js',
'react-dom': 'npm:react-dom@17.0.2/umd/react-dom.development.js',
'prop-types': 'npm:prop-types@15.8.1/prop-types.js',
'rrule': 'npm:rrule@2.6.4/dist/es5/rrule.js',
'luxon': 'npm:luxon@1.28.0/build/global/luxon.min.js',
'es6-object-assign': 'npm:es6-object-assign@1.1.0',
'devextreme': 'npm:devextreme@22.2.6/cjs',
'devextreme-react': 'npm:devextreme-react@22.2.6',
'jszip': 'npm:jszip@3.7.1/dist/jszip.min.js',
'devextreme-quill': 'npm:devextreme-quill@1.5.20/dist/dx-quill.min.js',
'devexpress-diagram': 'npm:devexpress-diagram@2.1.72/dist/dx-diagram.js',
'devexpress-gantt': 'npm:devexpress-gantt@4.1.43/dist/dx-gantt.js',
'@devextreme/runtime': 'npm:@devextreme/runtime@3.0.11',
'inferno': 'npm:inferno@7.4.11/dist/inferno.min.js',
'inferno-compat': 'npm:inferno-compat/dist/inferno-compat.min.js',
'inferno-create-element': 'npm:inferno-create-element@7.4.11/dist/inferno-create-element.min.js',
'inferno-dom': 'npm:inferno-dom/dist/inferno-dom.min.js',
'inferno-hydrate': 'npm:inferno-hydrate@7.4.11/dist/inferno-hydrate.min.js',
'inferno-clone-vnode': 'npm:inferno-clone-vnode/dist/inferno-clone-vnode.min.js',
'inferno-create-class': 'npm:inferno-create-class/dist/inferno-create-class.min.js',
'inferno-extras': 'npm:inferno-extras/dist/inferno-extras.min.js',
// SystemJS plugins
'plugin-babel': 'npm:systemjs-plugin-babel@0.0.25/plugin-babel.js',
'systemjs-babel-build': 'npm:systemjs-plugin-babel@0.0.25/systemjs-babel-browser.js',
// Prettier
'prettier/standalone': 'npm:prettier@2.8.4/standalone.js',
'prettier/parser-html': 'npm:prettier@2.8.4/parser-html.js',
},
packages: {
'devextreme': {
defaultExtension: 'js',
},
'devextreme-react': {
main: 'index.js',
},
'devextreme/events/utils': {
main: 'index',
},
'devextreme/events': {
main: 'index',
},
'es6-object-assign': {
main: './index.js',
defaultExtension: 'js',
},
},
packageConfigPaths: [
'npm:@devextreme/*/package.json',
'npm:@devextreme/runtime@3.0.11/inferno/package.json',
],
babelOptions: {
sourceMaps: false,
stage0: true,
react: true,
},
};
System.config(window.config);
using DevExtreme.MVC.Demos.Models.FileManagement;
using System;
using System.Net.Http;
using System.Web.Http;
using Azure.Storage;
using Azure.Storage.Sas;
using Azure.Storage.Blobs;
using Azure.Storage.Blobs.Models;
using Azure.Storage.Blobs.Specialized;
namespace DevExtreme.MVC.Demos.Controllers.ApiControllers {
public class FileManagerAzureAccessApiController : ApiController {
const string EmptyDirDummyBlobName = "aspxAzureEmptyFolderBlob";
const string ServiceUri = "https://{0}.blob.core.windows.net";
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; }
BlobServiceClient _client;
BlobServiceClient Client {
get {
if(_client == null) {
AzureStorageAccount accountModel = AzureStorageAccount.FileManager.Value;
StorageSharedKeyCredential credential = new StorageSharedKeyCredential(accountModel.AccountName, accountModel.AccessKey);
_client = new BlobServiceClient(new Uri(string.Format(ServiceUri, accountModel.AccountName)), credential);
}
return _client;
}
}
BlobContainerClient _container;
BlobContainerClient Container {
get {
if(_container == null) {
AzureStorageAccount accountModel = AzureStorageAccount.FileManager.Value;
_container = Client.GetBlobContainerClient(accountModel.ContainerName);
}
return _container;
}
}
[HttpGet]
[Route("api/file-manager-azure-access", Name = "FileManagerAzureAccessApi")]
public HttpResponseMessage Process(string command, string blobName = null, string blobName2 = null) {
object result;
try {
result = ProcessCommand(command, blobName, blobName2);
} catch {
result = CreateErrorResult();
}
return Request.CreateResponse(result);
}
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() {
if(Container.CanGenerateSasUri) {
var sasUri = Container.GenerateSasUri(BlobContainerSasPermissions.List, DateTimeOffset.UtcNow.AddHours(1));
return CreateSuccessResult(sasUri);
} else {
return CreateErrorResult("BlobContainerClient cannot generate SasUri");
}
}
object CreateDirectory(string directoryName) {
string blobName = $"{directoryName}/{EmptyDirDummyBlobName}";
var blob = Container.GetBlobClient(blobName);
if(blob.Exists()) {
return CreateErrorResult();
}
var sasUri = TryGetBlobUri(blob, BlobSasPermissions.Write);
if(sasUri != null) {
return CreateSuccessResult(sasUri);
} else {
return CreateErrorResult("BlobClient cannot generate SasUri");
}
}
object DeleteBlob(string blobName) {
var sasUri = TryGetBlobUri(blobName, BlobSasPermissions.Delete);
if(sasUri != null) {
return CreateSuccessResult(sasUri);
} else {
return CreateErrorResult("BlobClient cannot generate SasUri");
}
}
object CopyBlob(string sourceBlobName, string destinationBlobName) {
var sourceSasUri = TryGetBlobUri(sourceBlobName, BlobSasPermissions.Read);
var destinationSasUri = TryGetBlobUri(destinationBlobName, BlobSasPermissions.Create);
if(sourceSasUri != null && destinationSasUri != null) {
return CreateSuccessResult(sourceSasUri, destinationSasUri);
} else {
return CreateErrorResult("BlobClient cannot generate SasUri");
}
}
object UploadBlob(string blobName) {
if(blobName.EndsWith("/"))
return CreateErrorResult("Invalid blob name.");
var blob = Container.GetBlockBlobClient(blobName);
if(blob.Exists() && blob.GetProperties().Value.ContentLength > MaxBlobSize) {
return CreateErrorResult();
}
var sasUri = TryGetBlobUri(blobName, BlobSasPermissions.Write);
return CreateSuccessResult(sasUri);
}
object GetBlob(string blobName) {
var headers = new BlobHttpHeaders {
ContentType = "application/octet-stream"
};
var blob = Container.GetBlobClient(blobName);
blob.SetHttpHeaders(headers);
var sasUri = TryGetBlobUri(blob, BlobSasPermissions.Read);
return CreateSuccessResult(sasUri);
}
Uri TryGetBlobUri(string blobName, BlobSasPermissions permissions) {
if(!string.IsNullOrEmpty(blobName)) {
return TryGetBlobUri(Container.GetBlobClient(blobName), permissions);
} else {
return null;
}
}
Uri TryGetBlobUri(BlobClient blob, BlobSasPermissions permissions) {
if(blob.CanGenerateSasUri) {
return blob.GenerateSasUri(permissions, DateTimeOffset.UtcNow.AddHours(1));
} else {
return null;
}
}
object CreateSuccessResult(Uri uri, Uri uri2 = null) {
return new {
success = true,
accessUrl = uri.AbsoluteUri,
accessUrl2 = uri2 != null ? uri2.AbsoluteUri : null
};
}
object CreateErrorResult(string error = null) {
if(string.IsNullOrEmpty(error))
error = "Unspecified error.";
return new {
success = false,
error = error
};
}
}
}