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Added manual image thumbnail exif orientation handling

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Uses original image data to extract orientation exif to apply image
transformations before scaling and save. Manually done due to issues
with exif data loss during the existing Invervention image path.

For #1854
This commit is contained in:
Dan Brown 2022-03-26 12:32:08 +00:00
parent 2325a307a5
commit 55d61fceb2
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GPG Key ID: 46D9F943C24A2EF9
1 changed files with 46 additions and 0 deletions
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46
app/Uploads/ImageService.php
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@ -5,6 +5,7 @@ namespace BookStack\Uploads;
use BookStack\Exceptions\ImageUploadException;
use ErrorException;
use Exception;
use GuzzleHttp\Psr7\Utils;
use Illuminate\Contracts\Cache\Repository as Cache;
use Illuminate\Contracts\Filesystem\FileNotFoundException;
use Illuminate\Contracts\Filesystem\Filesystem as Storage;
@ -14,6 +15,7 @@ use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Str;
use Intervention\Image\Exception\NotSupportedException;
use Intervention\Image\Image as InterventionImage;
use Intervention\Image\ImageManager;
use League\Flysystem\Util;
use Psr\SimpleCache\InvalidArgumentException;
@ -308,6 +310,8 @@ class ImageService
throw new ImageUploadException(trans('errors.cannot_create_thumbs'));
}
$this->orientImageToOriginalExif($thumb, $imageData);
if ($keepRatio) {
$thumb->resize($width, $height, function ($constraint) {
$constraint->aspectRatio();
@ -328,6 +332,48 @@ class ImageService
return $thumbData;
}
/**
* Orientate the given intervention image based upon the given original image data.
* Intervention does have an `orientate` method but the exif data it needs is lost before it
* can be used (At least when created using binary string data) so we need to do some
* implementation on our side to use the original image data.
* Bulk of logic taken from: https://github.com/Intervention/image/blob/b734a4988b2148e7d10364b0609978a88d277536/src/Intervention/Image/Commands/OrientateCommand.php
* Copyright (c) Oliver Vogel, MIT License
*/
protected function orientImageToOriginalExif(InterventionImage $image, string $originalData): void
{
if (!extension_loaded('exif')) {
return;
}
$stream = Utils::streamFor($originalData)->detach();
$orientation = exif_read_data($stream)['Orientation'] ?? null;
switch ($orientation) {
case 2:
$image->flip();
break;
case 3:
$image->rotate(180);
break;
case 4:
$image->rotate(180)->flip();
break;
case 5:
$image->rotate(270)->flip();
break;
case 6:
$image->rotate(270);
break;
case 7:
$image->rotate(90)->flip();
break;
case 8:
$image->rotate(90);
break;
}
}
/**
* Get the raw data content from an image.
*