Private/Get-AuthToken.ps1
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function Get-AuthToken { <# .SYNOPSIS Get an authorization token from Azure AD. .DESCRIPTION Get an authorization token from Azure AD. .PARAMETER TenantName Specify the tenant name, e.g. domain.onmicrosoft.com." .PARAMETER ApplicationID Specify the Application ID of the app registration in Azure AD. By default, the script will attempt to use well known Microsoft Intune PowerShell app registration. .PARAMETER PromptBehavior Set the prompt behavior when acquiring a token. .NOTES Author: Nickolaj Andersen Contact: @NickolajA Created: 2020-01-04 Updated: 2020-03-11 Version history: 1.0.0 - (2020-01-04) Function created 1.0.1 - (2020-03-11) Improved output for attempting to update the PSIntuneAuth module #> [CmdletBinding(SupportsShouldProcess = $true)] param( [parameter(Mandatory = $true, HelpMessage = "Specify the tenant name, e.g. domain.onmicrosoft.com.")] [ValidateNotNullOrEmpty()] [string]$TenantName, [parameter(Mandatory = $false, HelpMessage = "Specify the Application ID of the app registration in Azure AD. By default, the script will attempt to use well known Microsoft Intune PowerShell app registration.")] [ValidateNotNullOrEmpty()] [string]$ApplicationID = "d1ddf0e4-d672-4dae-b554-9d5bdfd93547", [parameter(Mandatory = $false, HelpMessage = "Set the prompt behavior when acquiring a token.")] [ValidateNotNullOrEmpty()] [ValidateSet("Auto", "Always", "Never", "RefreshSession")] [string]$PromptBehavior = "Auto" ) # Determine if the PSIntuneAuth module needs to be installed try { Write-Verbose -Message "Attempting to locate PSIntuneAuth module" $PSIntuneAuthModule = Get-InstalledModule -Name "PSIntuneAuth" -ErrorAction Stop -Verbose:$false if ($PSIntuneAuthModule -ne $null) { Write-Verbose -Message "Authentication module detected, checking for latest version" $LatestModuleVersion = (Find-Module -Name "PSIntuneAuth" -ErrorAction SilentlyContinue -Verbose:$false).Version if ($LatestModuleVersion -gt $PSIntuneAuthModule.Version) { Write-Verbose -Message "Latest version of PSIntuneAuth module is not installed, attempting to install: $($LatestModuleVersion.ToString())" $UpdateModuleInvocation = Update-Module -Name "PSIntuneAuth" -Scope "AllUsers" -Force -ErrorAction Stop -Confirm:$false -Verbose:$false } else { Write-Warning -Message "Failed to determine if an update to the PSIntuneAuth module is necessary, will continue" } } } catch [System.Exception] { Write-Warning -Message "Unable to detect PSIntuneAuth module, attempting to install from PSGallery" try { # Install NuGet package provider $PackageProvider = Install-PackageProvider -Name "NuGet" -Force -Verbose:$false # Install PSIntuneAuth module Install-Module -Name "PSIntuneAuth" -Scope "AllUsers" -Force -ErrorAction Stop -Confirm:$false -Verbose:$false Write-Verbose -Message "Successfully installed PSIntuneAuth module" } catch [System.Exception] { Write-Warning -Message "An error occurred while attempting to install PSIntuneAuth module. Error message: $($_.Exception.Message)"; break } } # Check if token has expired and if, request a new Write-Verbose -Message "Checking for existing authentication token" if ($Global:AuthToken -ne $null) { $UTCDateTime = (Get-Date).ToUniversalTime() $TokenExpireMins = ($Global:AuthToken.ExpiresOn.datetime - $UTCDateTime).Minutes Write-Verbose -Message "Current authentication token expires in (minutes): $($TokenExpireMins)" if ($TokenExpireMins -le 0) { Write-Verbose -Message "Existing token found but has expired, requesting a new token" $Global:AuthToken = Get-MSIntuneAuthToken -TenantName $TenantName -ClientID $ApplicationID -PromptBehavior $PromptBehavior } else { if ($PromptBehavior -like "Always") { Write-Verbose -Message "Existing authentication token has not expired but prompt behavior was set to always ask for authentication, requesting a new token" $Global:AuthToken = Get-MSIntuneAuthToken -TenantName $TenantName -ClientID $ApplicationID -PromptBehavior $PromptBehavior } else { Write-Verbose -Message "Existing authentication token has not expired, will not request a new token" } } } else { Write-Verbose -Message "Authentication token does not exist, requesting a new token" $Global:AuthToken = Get-MSIntuneAuthToken -TenantName $TenantName -ClientID $ApplicationID -PromptBehavior $PromptBehavior } } |