PSCommunity/Azure/Active Directory/Get-MSGraphAuthenticationToken.ps1 at master · janegilring/PSCommunity · GitHub

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Function Get-MSGraphAuthenticationToken {

    <#
          .SYNOPSIS
          This function is used to get an authentication token for the Graph API REST interface
          .DESCRIPTION
          Built based on the following example script from Microsoft: https://github.com/microsoftgraph/powershell-intune-samples/blob/master/Authentication/Auth_From_File.ps1
          .EXAMPLE
          $Credential = Get-Credential
          $ClientId = 'f338765e-1cg71-427c-a14a-f3d542442dd'
          $AuthToken = Get-MSGraphAuthenticationToken -Credential $Credential -ClientId $ClientId
          .EXAMPLE
          $ClientId = 'f338765e-1cg71-427c-a14a-f3d542442dd'
          $AuthToken = Get-MSGraphAuthenticationToken -ClientId $ClientId -Tenant domain.onmicrosoft.com
      #>
    [cmdletbinding()]

    param
    (
        [Parameter(Mandatory = $true, ParameterSetName = 'PSCredential')]
        [PSCredential] $Credential,
        [Parameter(Mandatory = $true)]
        [String]$ClientId,
        [Parameter(Mandatory = $true, ParameterSetName = 'ADAL')]
        [String]$TenantId
    )

    Write-Verbose 'Importing prerequisite modules...'

    try {

        $AadModule = Import-Module -Name AzureAD -ErrorAction Stop -PassThru

    }

    catch {

        throw 'Prerequisites not installed (AzureAD PowerShell module not installed'

    }

    switch ($PsCmdlet.ParameterSetName) {

        'ADAL' { $tenant = $TenantId }

        'PSCredential' {
            $userUpn = New-Object "System.Net.Mail.MailAddress" -ArgumentList $Credential.Username
            $tenant = $userUpn.Host
        }

    }


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

    $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

    $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

        if ($PSBoundParameters.ContainsKey('Credential')) {

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

            $userId = New-Object "Microsoft.IdentityModel.Clients.ActiveDirectory.UserIdentifier" -ArgumentList ($Credential.Username, "OptionalDisplayableId")

            $userCredentials = New-Object Microsoft.IdentityModel.Clients.ActiveDirectory.UserPasswordCredential -ArgumentList $Credential.Username, $Credential.Password

            $authResult = [Microsoft.IdentityModel.Clients.ActiveDirectory.AuthenticationContextIntegratedAuthExtensions]::AcquireTokenAsync($authContext, $resourceAppIdURI, $clientid, $userCredentials);

            if ($authResult.Result.AccessToken) {

                      # Creating header for Authorization token

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

                      return $authHeader

                  }
                  elseif ($authResult.Exception) {

                      throw "An error occured getting access token: $($authResult.Exception.InnerException)"

                  }

        }
        else {

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

            $authResult = ($authContext.AcquireTokenAsync($resourceAppIdURI, $ClientID, $RedirectUri, $platformParameters)).Result

            if ($authResult.AccessToken) {

                      # Creating header for Authorization token

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

                    return $authHeader

                  }

        }


    }

    catch {

        throw $_.Exception.Message

    }

}