Script repository

$copyFromPropertyName = "adm-CustomAttributeBinary1" # TODO: modify me
$photoAttribute = "thumbnailPhoto" # TODO: modify me

function ResizePhoto ($photoBytes, $maxSize, $reduceSizeStep, $reduceSizeInPercents, $maxWidth, $maxHeight)
{
    if ($reduceSizeInPercents -ge 100)
    {
        return ,$photoBytes
    }

    try
    {
        # Calculate the new size, preserve ratio
        $original = [System.Drawing.Image]$photoBytes

        $width = $original.Width
        $height = $original.Height

        if ($NULL -ne $maxWidth)
        {
            if ($width -le $maxWidth -and $height -le $maxHeight)
            {
                return ,$photoBytes
            }

            $ratioX = $maxWidth / $width
            $ratioY = $maxHeight / $height
        }
        else
        {
            $ratioX = ($width - (($width / 100) * $reduceSizeInPercents)) / $width
            $ratioY = ($height - (($height / 100) * $reduceSizeInPercents)) / $height
        }

        $ratio = $ratioY
        if ($ratioX -le $ratioY)
        {
            $ratio = $ratioX
        }

        # Resize the picture
        [int]$newWidth = $width * $ratio
        [int]$newHeight = $height * $ratio

        $newPicture = New-Object System.Drawing.Bitmap($newWidth, $newHeight)
        $graph = [System.Drawing.Graphics]::FromImage($newPicture)

        $graph.Clear([System.Drawing.Color]::White)
        $graph.DrawImage($original, 0, 0, $newWidth, $newHeight)

        $memoryStream = New-Object System.IO.MemoryStream
        $newPicture.Save($memoryStream, [System.Drawing.Imaging.ImageFormat]::Jpeg)
        $newPictureBytes = $memoryStream.ToArray()
    }
    finally
    {
        # Release resources
        if ($original) { $original.Dispose() }
        if ($graph) { $graph.Dispose() }
        if ($newPicture) { $newPicture.Dispose() }
        if ($memoryStream) { $memoryStream.Dispose() }
    }

    if (($NULL -ne $maxSize) -and 
        ($newPictureBytes.Length -gt $maxSize))
    {
        $reduceSizeInPercents += $reduceSizeStep
        $newPictureBytes = ResizePhoto $photoBytes $maxSize $reduceSizeStep $reduceSizeInPercents
    }

    return ,$newPictureBytes
}

# Get the picture
try
{
    $photoBytes = $Context.TargetObject.Get($copyFromPropertyName)
}
catch
{
    $Context.LogMessage("No picture specified in attribute $copyFromPropertyName.", "Warning")
    return # No picture
}

# Update thumbnailPhoto
$maxSize = 102400
if ($photoBytes.Length -gt $maxSize)
{
    $thumbnailPhotoBytes = ResizePhoto $photoBytes $maxSize 1 0 $NULL $NULL
}
else
{
    $thumbnailPhotoBytes = $photoBytes
}

$Context.TargetObject.Put($photoAttribute, $thumbnailPhotoBytes)
$Context.TargetObject.SetInfo()

if ($NULL -eq $Context.TargetObject.AzureID)
{
    $Context.LogMessage("User %fullname% has no account in Microsoft 365.", "Warning")
    return
}

$userPhotoBytes = ResizePhoto $photoBytes $NULL $NULL $NULL 648 648

# Connect to Microsoft Graph PowerShell
$accessToken = $Context.CloudServices.GetAzureAuthAccessToken()
Connect-MgGraph -AccessToken ($accessToken | ConvertTo-SecureString -AsPlainText -Force)

try
{
    # Create temp file
    $tempFile = New-TemporaryFile
    [System.Io.File]::WriteAllBytes($tempFile.FullName, $userPhotoBytes)
    
    # Update the user's photo
    Set-MgUserPhotoContent -UserId $Context.TargetObject.AzureID -InFile $tempFile.FullName
}
finally
{
    # Remove the temp file
    Remove-Item $tempFile -Force
}