DownloadAllInTunePowershellFiles.ps1

#Function to get AuthToken for Azure GraphAPI
function Get-AuthToken {

<#
.SYNOPSIS
This function is used to authenticate with the Graph API REST interface
.DESCRIPTION
The function authenticate with the Graph API Interface with the tenant name
.EXAMPLE
Get-AuthToken
Authenticates you with the Graph API interface
.NOTES
NAME: Get-AuthToken
#>

[cmdletbinding()]

param
(
    [Parameter(Mandatory=$true)]
    $User

)

$userUpn = New-Object "System.Net.Mail.MailAddress" -ArgumentList $User

$tenant = $userUpn.Host

Write-Host "Checking for AzureAD module..."

    $AadModule = Get-Module -Name "AzureAD" -ListAvailable
    
    if ($AadModule -eq $null) {
        
        Write-Host "AzureAD PowerShell module not found, looking for AzureADPreview"
        $AadModule = Get-Module -Name "AzureADPreview" -ListAvailable

    }

    if ($AadModule -eq $null) {
        write-host
        write-host "AzureAD Powershell module not installed..." -f Red
        write-host "Install by running 'Install-Module AzureAD' or 'Install-Module AzureADPreview' from an elevated PowerShell prompt" -f Yellow
        write-host "Script can't continue..." -f Red
        write-host
        exit
    }

# Getting path to ActiveDirectory Assemblies
# If the module count is greater than 1 find the latest version

    if($AadModule.count -gt 1){

        $Latest_Version = ($AadModule | select version | Sort-Object)[-1]

        $aadModule = $AadModule | ? { $_.version -eq $Latest_Version.version }

        $adal = Join-Path $AadModule.ModuleBase "Microsoft.IdentityModel.Clients.ActiveDirectory.dll"
        $adalforms = Join-Path $AadModule.ModuleBase "Microsoft.IdentityModel.Clients.ActiveDirectory.Platform.dll"

    }

    else {

        $adal = Join-Path $AadModule.ModuleBase "Microsoft.IdentityModel.Clients.ActiveDirectory.dll"
        $adalforms = Join-Path $AadModule.ModuleBase "Microsoft.IdentityModel.Clients.ActiveDirectory.Platform.dll"

    }

[System.Reflection.Assembly]::LoadFrom($adal) | Out-Null

[System.Reflection.Assembly]::LoadFrom($adalforms) | Out-Null
 
# Client ID used for Intune scopes

$clientId = "d1ddf0e4-d672-4dae-b554-9d5bdfd93547"

$redirectUri = "urn:ietf:wg:oauth:2.0:oob"

$resourceAppIdURI = "https://graph.microsoft.com"

$authority = "https://login.microsoftonline.com/$Tenant"

    try {

    $authContext = New-Object "Microsoft.IdentityModel.Clients.ActiveDirectory.AuthenticationContext" -ArgumentList $authority

    # https://msdn.microsoft.com/en-us/library/azure/microsoft.identitymodel.clients.activedirectory.promptbehavior.aspx
    # Change the prompt behaviour to force credentials each time: Auto, Always, Never, RefreshSession

    $platformParameters = New-Object "Microsoft.IdentityModel.Clients.ActiveDirectory.PlatformParameters" -ArgumentList "Auto"

    $userId = New-Object "Microsoft.IdentityModel.Clients.ActiveDirectory.UserIdentifier" -ArgumentList ($User, "OptionalDisplayableId")
            
    $authResult = $authContext.AcquireTokenAsync($resourceAppIdURI,$clientId,$redirectUri,$platformParameters,$userId).Result

    # If the accesstoken is valid then create the authentication header

        if($authResult.AccessToken){

        # Creating header for Authorization token

        $authHeader = @{
            'Content-Type'='application/json'
            'Authorization'="Bearer " + $authResult.AccessToken
            'ExpiresOn'=$authResult.ExpiresOn
            }

        return $authHeader

        }

        else {

        Write-Host
        Write-Host "Authorization Access Token is null, please re-run authentication..." -ForegroundColor Red
        Write-Host

        break

        }

    }

    catch {

    write-host $_.Exception.Message -f Red
    write-host $_.Exception.ItemName -f Red
    write-host
    break

    }

}

#Get Admin Username

$User = Read-Host -Prompt "Please specify your user principal name for Azure Authentication"
Write-Host
 
#Get Auth Token
 
$authToken = Get-AuthToken -User $User

#Get Scripts

$graphApiVersion = "Beta"
$Resource = "deviceManagement/deviceManagementScripts"

$uri = "https://graph.microsoft.com/$graphApiVersion/$Resource/"
$scriptarray = (Invoke-RestMethod -Uri $uri -Headers $authToken -Method Get).value


foreach ($script in $scriptarray) {
	$detailuri = "https://graph.microsoft.com/$graphApiVersion/$Resource/" + $script.id
	#Show Scripts in Output
	Invoke-RestMethod -Uri $detailuri -Headers $authToken -Method Get
	$script64 = (Invoke-RestMethod -Uri $detailuri -Headers $authToken -Method Get).scriptContent
	#Decode Base64 into Scripts
    $decodedscript = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($script64))
	#output Files
	New-Item -Path . -Name $script.fileName -ItemType "file" -Value $decodedscript
}