Custom Azure Blob Storage Provider

Starting from Q1 2014 CloudUpload supports creating of Custom Storage Providers. They allow developers to set dynamically in the code-behind credentials for every Storage Provider multiple usage of Storage Providers of the same type.

Setting Credentials Dynamically from the Code Behind

The easiest way to set credentials from the code behind is to create a custom Azure provider. This can done following the steps below:

Create a new class, which inherits the AzureProvider class and override its Initialize method. In this method you can set all

using System;
using System.Linq;
using Telerik.Web.UI;

namespace SampleNamespace
{
    public class CustomAzureProvider : AzureProvider
    {
        public override void Initialize(string name, System.Collections.Specialized.NameValueCollection config)
        {
            AccountKey = "{ACCOUNT_KEY}";
            AccountName = "{ACCOUNT_NAME}";
            BlobContainer = "{BLOB_CONTAINER}";
            SubFolderStructure = "{SUB_FOLDER_STRUCTURE}";
            UncommitedFilesExpirationPeriod = TimeSpan.FromHours(2);
        }
    }
}

VB.NET

Imports System
Imports System.Linq
Imports Telerik.Web.UI

Namespace SampleNamespace

    Public Class CustomAzureProvider
        Inherits AzureProvider

        Public Overrides Sub Initialize(name As String, config As System.Collections.Specialized.NameValueCollection)
            AccountKey = "{ACCOUNT_KEY}"
            AccountName = "{ACCOUNT_NAME}"
            BlobContainer = "{BLOB_CONTAINER}"
            SubFolderStructure = "{SUB_FOLDER_STRUCTURE}"
            UncommitedFilesExpirationPeriod = TimeSpan.FromHours(2)
        End Sub

    End Class

End Namespace

Add new storage provider in the configuration file as you set the new Type.

XML

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <configSections>
        <sectionGroup name="telerik.web.ui">
            <section name="radCloudUpload" type="Telerik.Web.UI.CloudUploadConfigurationSection" allowDefinition="MachineToApplication" requirePermission="false" />
        </sectionGroup>
    </configSections>
 ...
    <telerik.web.ui>
        <radCloudUpload>
            <storageProviders>
                <!-- Add a new storage with a Type of the Custom Provider. Note that the Type is a combination of the name space and the class name. -->
                <add name="Azure" type="SampleNamespace.CustomAzureProvider"/>
            </storageProviders>
        </radCloudUpload>
    </telerik.web.ui>
</configuration>

Define the CloudUpload

ASP.NET

<telerik:RadCloudUpload ID="RadCloudUpload1" runat="server" ProviderType="Azure"></telerik:RadCloudUpload>

Switching Custom Azure Providers

Common scenario is the need to upload files in different Azure providers. For example files uploading in different Geo Locations.

Create a as many Custom Providers as you need. They must inherit the AzureProvider class. Override their Initialize method.

using System;
using System.Linq;
using Telerik.Web.UI;

namespace SampleNamespace
{
    public class CustomAzureProvider1 : AzureProvider
    {
        public override void Initialize(string name, System.Collections.Specialized.NameValueCollection config)
        {
            //Keys
            AccountKey = "{ACCOUNT_KEY}";
            AccountName = "{ACCOUNT_NAME}";
            BlobContainer = "{BLOB_CONTAINER}";
            SubFolderStructure = "{SUB_FOLDER_STRUCTURE}";
            UncommitedFilesExpirationPeriod = TimeSpan.FromHours(2);
        }
    }
}

VB.NET

Imports System
Imports System.Linq
Imports Telerik.Web.UI

Namespace SampleNamespace

    Public Class CustomAzureProvider1
        Inherits AzureProvider

        Public Overrides Sub Initialize(name As String, config As System.Collections.Specialized.NameValueCollection)
            AccountKey = "{ACCOUNT_KEY}"
            AccountName = "{ACCOUNT_NAME}"
            BlobContainer = "{BLOB_CONTAINER}"
            SubFolderStructure = "{SUB_FOLDER_STRUCTURE}"
            UncommitedFilesExpirationPeriod = TimeSpan.FromHours(2)
        End Sub

    End Class

End Namespace

using System;
using System.Linq;
using Telerik.Web.UI;

namespace SampleNamespace
{
    public class CustomAzureProvider2 : AzureProvider
    {
        public override void Initialize(string name, System.Collections.Specialized.NameValueCollection config)
        {
            //Values from the config NameValueCollection are passed from the web.config file.
            AccountKey = config["accountKey"];
            AccountName = config["accountName"];
            BlobContainer = config["blobContainer"];
            SubFolderStructure = config["subFolderStructure"];
            UncommitedFilesExpirationPeriod = config["uncommitedFilesExpirationPeriod"];
        }
    }
}

VB.NET

Imports System
Imports System.Linq
Imports Telerik.Web.UI

Namespace SampleNamespace

    Public Class CustomAzureProvider2
        Inherits AzureProvider

        Public Overrides Sub Initialize(name As String, config As System.Collections.Specialized.NameValueCollection)
            'Values from the config NameValueCollection are passed from the web.config file.
            AccountKey = config("accountKey")
            AccountName = config("accountName")
            BlobContainer = config("blobContainer")
            SubFolderStructure = config("subFolderStructure")
            UncommitedFilesExpirationPeriod = config("uncommitedFilesExpirationPeriod")
        End Sub

    End Class

End Namespace

XML

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <configSections>
        <sectionGroup name="telerik.web.ui">
            <section name="radCloudUpload" type="Telerik.Web.UI.CloudUploadConfigurationSection" allowDefinition="MachineToApplication" requirePermission="false" />
        </sectionGroup>
    </configSections>
 ...
    <telerik.web.ui>
        <radCloudUpload>
            <storageProviders>
                <!-- Add a new storage providers with a Type of the Custom Provider. Note that the Type is a combination of the name space and the class name. -->
                <add name="CustomAzureProvider1 " type="SampleNamespace.CustomAzureProvider1"/>
                <!--Keys defined in the configuration file-->
                <add name="CustomAzureProvider2 " type="SampleNamespace.CustomAzureProvider2" accountKey="{ACCOUNT_KEY}" accountName="{ACCOUNT_NAME}" blobContainer="{BLOB_CONTAINER}" subFolderStructure="{SUB_FOLDER-STRUCTURE}" ensureContainer="true" uncommitedFilesExpirationPeriod="2" defaultEndpointsProtocol="https" />
            </storageProviders>
        </radCloudUpload>
    </telerik.web.ui>
</configuration>

Add a new CloudUpload control with ProviderType Azure and set the HttpHandlerUrl property.

ASP.NET

<telerik:RadCloudUpload ID="RadCloudUpload2" runat="server" ProviderType="Azure" HttpHandlerUrl="~/Handler.ashx" ></telerik:RadCloudUpload>

Set the name of the Custom Azure Provider in the handler:

<%@ WebHandler Language="C#" Class="CloudUploadHandler" %>

using System;
using System.Web;

public class CloudUploadHandler : Telerik.Web.UI.CloudUploadHandler 
{
    public override void SetCustomProvider(object sender, Telerik.Web.UI.CloudUpload.CustomProviderSetupEventArgs e)
    {
        //Check for some condition and select Custom Provider
        if (true)
        {
            e.Name = "CustomAzureProvider2";
        }
        else
        {
            e.Name = "CustomAzureProvider1";
        }
    }
}

VB.NET

<%@ WebHandler Language="VB" Class="CloudUploadHandler" %>
Imports System
Imports System.Web
Imports Telerik.Web.UI

Public Class CloudUploadHandler
    Inherits Telerik.Web.UI.CloudUploadHandler

    Public Overrides Sub SetCustomProvider(sender As Object, e As Telerik.Web.UI.CloudUpload.CustomProviderSetupEventArgs)
        'Check for some condition and select Custom Provider
        If True Then
            e.Name = "CustomAzureProvider2"
        Else
            e.Name = "CustomAzureProvider1"
        End If
    End Sub
End Class

Custom Azure Blob Storage Provider

Setting Credentials Dynamically from the Code Behind

Switching Custom Azure Providers

See Also

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