Script repository

$maxWidth = 80 # TODO: modify me
$maxHeight = 80 # TODO: modify me

function CheckFileSizeAndSave ($filePath, $quality, $imageFormat, $imageCodecInfo, $picture)
{
    if ($quality -lt 0)
    {
        DeleteTmpFile $filePath
        return
    }
    
    # Set encoder settings for image quality.
    $encoderParams = New-Object System.Drawing.Imaging.EncoderParameters(1)
    $encoder = [System.Drawing.Imaging.Encoder]::Quality
    $encoderParams.Param[0] = New-Object System.Drawing.Imaging.EncoderParameter($encoder, $quality)
    
    # Save file
    $picture.Save($filePath, $imageCodecInfo, $($encoderParams))
    
    # Check file size.
    $fileSize = (Get-Item $filePath).Length / 1kb
    if ($fileSize -lt 100)
    {
        return
    }
    else
    {
        $quality = $quality - 10
        CheckFileSizeAndSave $filePath $quality $imageFormat $imageCodecInfo $picture
    }
}

function DeleteTmpFile ($filePath)
{
    [System.IO.File]::Delete($filePath)
}

function UpdateUserPhoto ($tmpFilePath)
{
    if (!(Test-Path $tmpFilePath))
    {
        $Context.Cancel("Automatic photo resize failed.") # TODO: modify me
        return
    }
    
    # Update the thumbnailPhoto attribute.
    $thumbnailPhotoBytes = [System.IO.File]::ReadAllBytes($tmpFilePath)
    $Context.SetModifiedPropertyValue("thumbnailPhoto", $thumbnailPhotoBytes)
    
    # Delete the temporary file.
    DeleteTmpFile $tmpFilePath
}

# Get the picture
$thumbnailPhotoBytes = $Context.GetModifiedPropertyValue("thumbnailPhoto")
if ([System.String]::IsNullOrEmpty($thumbnailPhotoBytes))
{
    return
}

try
{
    $original = [System.Drawing.Image]$thumbnailPhotoBytes
    $originalWidth = $original.Width
    $originalHeight = $original.Height
    
    # Check original size.
    $tmpFilePath = [System.IO.Path]::GetTempFileName()
    $imageFormat = "System.Drawing.Imaging.ImageFormat" -as [type]
    $imageCodecInfo = [System.Drawing.Imaging.ImageCodecInfo]::GetImageEncoders() | where {$_.MimeType -eq 'image/jpeg'}
    if (($originalHeight -gt $maxHeight) -or ($originalWidth -gt $maxWidth))
    {
        # Calculate new size, preserve ratio.
        $ratioX = $maxWidth / $originalWidth
        $ratioY = $maxHeight / $originalHeight
        $ratio = $ratioY
        if ($ratioX -le $ratioY)
        {
            $ratio = $ratioX
        }
       
        # Resize picture
        $newPicture = $original.GetThumbnailImage($originalWidth * $ratio, $originalHeight * $ratio, $null, [intptr]::Zero)
        CheckFileSizeAndSave $tmpFilePath 100 $imageFormat $imageCodecInfo $newPicture
        if (!(Test-Path $tmpFilePath))
        {
            $Context.Cancel("Automatically resize photos failed.")
            return
        }
        
        UpdateUserPhoto $tmpFilePath
    }
    else
    {
        CheckFileSizeAndSave $tmpFilePath 100 $imageFormat $imageCodecInfo $original
        UpdateUserPhoto $tmpFilePath
    }
}
finally
{
    # Release resources
    if ($original) { $original.Dispose() }
    if ($newPicture) { $newPicture.Dispose() }
}