BookStack Code Mirror - bookstack/blob - app/Uploads/ImageResizer.php

   1 <?php
   2
   3 namespace BookStack\Uploads;
   4
   5 use BookStack\Exceptions\ImageUploadException;
   6 use GuzzleHttp\Psr7\Utils;
   7 use Intervention\Image\Exception\NotSupportedException;
   8 use Intervention\Image\Image as InterventionImage;
   9 use Intervention\Image\ImageManager;
  10
  11 class ImageResizer
  12 {
  13     public function __construct(
  14         protected ImageManager $intervention
  15     ) {
  16     }
  17
  18     /**
  19      * Resize the image of given data to the specified size, and return the new image data.
  20      *
  21      * @throws ImageUploadException
  22      */
  23     protected function resizeImageData(string $imageData, ?int $width, ?int $height, bool $keepRatio): string
  24     {
  25         try {
  26             $thumb = $this->intervention->make($imageData);
  27         } catch (NotSupportedException $e) {
  28             throw new ImageUploadException(trans('errors.cannot_create_thumbs'));
  29         }
  30
  31         $this->orientImageToOriginalExif($thumb, $imageData);
  32
  33         if ($keepRatio) {
  34             $thumb->resize($width, $height, function ($constraint) {
  35                 $constraint->aspectRatio();
  36                 $constraint->upsize();
  37             });
  38         } else {
  39             $thumb->fit($width, $height);
  40         }
  41
  42         $thumbData = (string) $thumb->encode();
  43
  44         // Use original image data if we're keeping the ratio
  45         // and the resizing does not save any space.
  46         if ($keepRatio && strlen($thumbData) > strlen($imageData)) {
  47             return $imageData;
  48         }
  49
  50         return $thumbData;
  51     }
  52
  53     /**
  54      * Orientate the given intervention image based upon the given original image data.
  55      * Intervention does have an `orientate` method but the exif data it needs is lost before it
  56      * can be used (At least when created using binary string data) so we need to do some
  57      * implementation on our side to use the original image data.
  58      * Bulk of logic taken from: https://github.com/Intervention/image/blob/b734a4988b2148e7d10364b0609978a88d277536/src/Intervention/Image/Commands/OrientateCommand.php
  59      * Copyright (c) Oliver Vogel, MIT License.
  60      */
  61     protected function orientImageToOriginalExif(InterventionImage $image, string $originalData): void
  62     {
  63         if (!extension_loaded('exif')) {
  64             return;
  65         }
  66
  67         $stream = Utils::streamFor($originalData)->detach();
  68         $exif = @exif_read_data($stream);
  69         $orientation = $exif ? ($exif['Orientation'] ?? null) : null;
  70
  71         switch ($orientation) {
  72             case 2:
  73                 $image->flip();
  74                 break;
  75             case 3:
  76                 $image->rotate(180);
  77                 break;
  78             case 4:
  79                 $image->rotate(180)->flip();
  80                 break;
  81             case 5:
  82                 $image->rotate(270)->flip();
  83                 break;
  84             case 6:
  85                 $image->rotate(270);
  86                 break;
  87             case 7:
  88                 $image->rotate(90)->flip();
  89                 break;
  90             case 8:
  91                 $image->rotate(90);
  92                 break;
  93         }
  94     }
  95 }