Change Azure blobs content type (batch)

ChangeAzureBlobContentType.ps1

Based on: https://gallery.technet.microsoft.com/scriptcenter/How-to-batch-change-the-47e310b4



#--------------------------------------------------------------------------------- 
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#without limitation, any implied warranties of merchantability or of fitness for 
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#of or inability to use the sample scripts or documentation, even if Microsoft 
#has been advised of the possibility of such damages 
#--------------------------------------------------------------------------------- 

#requires -Version 3.0

<#
 	.SYNOPSIS
       This script can be batch change the content type of blob.                                         .
    .DESCRIPTION
       This script can be batch change the content type of blob.        
    .PARAMETER  ContainerName
		Specifies the name of container.
	.PARAMETER	BlobName
		Specifies the name of blob. It is not required, if the name of blob is not specified, this will changes the content 
        type of all blob items in the sepcified container and in all child container.
	.PARAMETER  ContentType
		Specifies a content type, it can be any type.  Optional, if not specified try to understand it from the blob name
	.PARAMETER  StorageAccountName
		Specifies the name of the storage account to be connected.
	.EXAMPLE
        C:\PS> C:\Script\ChangeAzureBlobContentType.ps1 -StorageAccountName "AzureStorage01" -ContainerName "pics" -BlobName "doc.txt" -ContentType "image/jpg"

        Successfully changed the content type of 'doc.txt' to 'image/jpg'.
		
		This example shows how to change the content type of 'doc.txt' to 'image/jpg'.
	.EXAMPLE
        C:\PS> C:\Script\ChangeAzureBlobContentType.ps1 -StorageAccountName "AzureStorage01" -ContainerName "pics" -ContentType "image/jpg"

        Successfully changed content type of '1365687925207897_840_560.jpg' to 'image/jpg'.
        Successfully changed content type of 'Shanghai/1365687925207897_840_560.jpg' to 'image/jpg'.
        Successfully changed content type of 'doc.txt' to 'image/jpg'.
        Successfully changed content type of 'doc1.txt' to 'image/jpg'.
		
		If you don't specify a BlobName parameter, the script batch changes the content type of all blob items in the specified container and in all child container.
    .EXAMPLE
        C:\PS> C:\Script\ChangeAzureBlobContentType.ps1 -StorageAccountName "AzureStorage01" -ContainerName "pics" -ContentType "image/jpg" -WhatIf
		
        What if: Performing the operation "Change the content type" on target "1365687925207897_840_560.jpg".
        What if: Performing the operation "Change the content type" on target "Shanghai/1365687925207897_840_560.jpg".
        What if: Performing the operation "Change the content type" on target "doc.txt".
        What if: Performing the operation "Change the content type" on target "doc1.txt".

		It displays a message that describes the effect of the command, instead of executing the command.
#>
[CmdletBinding(SupportsShouldProcess = $true)]

Param
(
    [Parameter(Mandatory = $true)]
    [Alias('CN')]
    [String]$ContainerName,
    [Parameter(Mandatory = $false)]
    [Alias('BN')]
    [String]$BlobName,
    [Parameter(Mandatory = $false)]
    [Alias('CT')]
    [String]$ContentType,
    [Parameter(Mandatory = $true)]
    [Alias('SN')]
    [String]$StorageAccountName
)

#Check if Windows Azure PowerShell Module is avaliable
If((Get-Module -ListAvailable Azure) -eq $null)
{
    Write-Warning "Windows Azure PowerShell module not found! Please install from http://www.windowsazure.com/en-us/downloads/#cmd-line-tools"
}
Else
{

    Function ChangeBlobContentType
    {
        Param
        (
            [String]$ContainerName,
            [String]$BlobName,
            [String]$ContentType
        )

        Write-Verbose "Getting the container object named $ContainerName."
        $BlobContainer = $CloudBlobClient.GetContainerReference($ContainerName)

        Write-Verbose "Getting the blob object named $BlobName."
        $Blob = $BlobContainer.GetBlockBlobReference($BlobName)
        
        if (!$ContentType) {
            if ($BlobName.EndsWith(".jpg")){
                $ContentType = "image/jpeg"
            }elseif ($BlobName.EndsWith(".png")){
                $ContentType = "image/png"
            }elseif ($BlobName.EndsWith(".js")){
                $ContentType = "application/javascript"
            }elseif ($BlobName.EndsWith(".css")){
                $ContentType = "text/css"
            }elseif ($BlobName.EndsWith(".json")){
                $ContentType = "application/json"
            }elseif ($BlobName.EndsWith(".html")){
                $ContentType = "text/html"
            }elseif ($BlobName.EndsWith(".htm")){
                $ContentType = "text/html"
            }elseif ($BlobName.EndsWith(".xml")){
                $ContentType = "text/xml"
            } else {
                $ContentType = "application/octet-stream"
            }
        }

        Write-Verbose "Changing content type of '$BlobName' to '$ContentType'."
        Try
        {
            $Blob.Properties.ContentType = $ContentType
            $Blob.SetProperties()
            Write-Host "Successfully changed content type of '$BlobName' to '$ContentType'."
        }
        Catch
        {
            Write-Host "Failed to change content type of '$BlobName'." -ForegroundColor Red
        }
    }

    If($StorageAccountName)
    {
        Get-AzureStorageAccount -StorageAccountName $StorageAccountName | Out-Null

        #Specify a Windows Azure Storage Library path
        $StorageLibraryPath = "$env:SystemDrive\Program Files\Microsoft SDKs\Windows Azure\.NET SDK\v2.1\ref\Microsoft.WindowsAzure.Storage.dll"

        #Getting Azure storage account key
        $Keys = Get-AzureStorageKey -StorageAccountName $StorageAccountName
        $StorageAccountKey = $Keys[0].Primary

        #Loading Windows Azure Storage Library for .NET.
        Write-Verbose -Message "Loading Windows Azure Storage Library from $StorageLibraryPath"
        [Reflection.Assembly]::LoadFile("$StorageLibraryPath") | Out-Null

        $Creds = New-Object Microsoft.WindowsAzure.Storage.Auth.StorageCredentials("$StorageAccountName","$StorageAccountKey")
        $CloudStorageAccount = New-Object Microsoft.WindowsAzure.Storage.CloudStorageAccount($creds, $true)
        $CloudBlobClient = $CloudStorageAccount.CreateCloudBlobClient()
    }

    If($ContainerName)
    {
        Get-AzureStorageContainer -Name $ContainerName | Out-Null
        If($BlobName)
        {
            Get-AzureStorageBlob -Container $ContainerName -Blob $BlobName | Out-Null
            #user specifiy a name of blob, the script will change the content type of specified blob only.
            If($PSCmdlet.ShouldProcess("$BlobName","Change the content type"))
            {
                ChangeBlobContentType -ContainerName $ContainerName -BlobName $BlobName -ContentType $ContentType
            }
        }
        Else
        {
            #If user does not specifiy a blob, the script will change the content type of
            #all blob items in the sepcified container and in all child container.
            $count = 0
            $BlobItems = Get-AzureStorageBlob -Container $ContainerName | Where{$_.SnapshotTime -eq $null}
            Foreach($BlobItem in $BlobItems)
            {
                $count = $count + 1
                $BlobN = $BlobItem.Name
                If($PSCmdlet.ShouldProcess("$BlobN","Change the content type"))
                {
                    ChangeBlobContentType -ContainerName $ContainerName -BlobName $BlobN -ContentType $ContentType
                    Write-Host $count
                }
            }  
        }
    }
}

Try specifying your content type manually - an additional parameter you have to add :)