Invokable class to rotate an image data URI

RotateImageDataURI.php

<?php
use InvalidArgumentException;

/**
 * Rotate an image DataURI string.
 *
 * Because I'm working with a string, not a file, the Drupal image API
 * (image.factory) didn't seem to be an appropriate solution, therefor I'm using
 * the native PHP GD library.
 */
class RotateImageDataURI {

  /**
   * @param string $data_uri A data:image/*;base64... image string.
   * @param float $degrees Note that -90 turns clockwise.
   *
   * @return void
   */
  public function __invoke(string &$data_uri, float $degrees): void {
    if (!$degrees) {
      return;
    }
    $uri_parts = explode(',', $data_uri);
    $imageData = base64_decode($uri_parts[1]);
    $sourceImage = imagecreatefromstring($imageData);
    $image_resource = imagerotate($sourceImage, $degrees, 0);
    ob_start();
    $mime = $this->getMimeType($data_uri);
    $this->echoImage($mime, $image_resource);
    $raw_image_stream = ob_get_clean();
    $data_uri = 'data:image/png;base64,' . base64_encode($raw_image_stream);
  }

  private function echoImage(string $mime, $image_resource): void {
    switch ($mime) {
      case 'image/jpeg':
        imagejpeg($image_resource);
        break;
      case 'image/png':
        imagepng($image_resource);
        break;
      case 'image/gif':
        imagegif($image_resource);
        break;
      default:
        throw new InvalidArgumentException('Unsupported image type.');
    }
  }

  private function getMimeType(string $data_uri): string {
    preg_match('#data:(.+?);#', $data_uri, $matches);

    return $matches[1] ?? '';
  }

}