Creating a custom image generator

If you want to generate a conversion for a file type that is not covered out of the box you can easily create your own media generator.

In the following example we'll create a custom generator that can convert a Powerpoint to an image.

##Creating the custom generator

The first step for creating a custom generator is to create a class that extends Spatie\MediaLibrary\ImageGenerators:

use Illuminate\Support\Collection;
use Spatie\MediaLibrary\Conversion\Conversion;
use Spatie\MediaLibrary\ImageGenerators\BaseGenerator;

class PowerPoint extends BaseGenerator
{
    /**
    * This function should return a path to an image representation of the given file.
    */
    public function convert(string $file, Conversion $conversion = null) : string
    {
        $pathToImageFile = pathinfo($file, PATHINFO_DIRNAME).'/'.pathinfo($file, PATHINFO_FILENAME).'.jpg';

        // Here you should convert the file to an image and return generated conversion path.
        \PowerPoint::convertFileToImage($file)->store($imageFile);

        return $imageFile;
    }

    public function requirementsAreInstalled() : bool
    {
        return true;
    }

    public function supportedExtensions() : Collection
    {
        return collect(['ppt', 'pptx']);
    }

    public function supportedMimeTypes() : Collection
    {
        return collect([
            'application/vnd.ms-powerpoint',
            'application/vnd.openxmlformats-officedocument.presentationml.presentation'
        ]);
    }
}

##Registering the custom generator

If you want the generator to be applied to all your models, you can override the Media class as explained in the using your own model page and modify the getImageGenerators method in your own Media class.

If the generator only needs to be applied to one of your models you can override the getImageGenerators in that model like this:

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Spatie\MediaLibrary\HasMedia\HasMediaTrait;
use Spatie\MediaLibrary\HasMedia\Interfaces\HasMedia;

class News extends Model implements HasMedia
{
   ...

   /**
    * Collection of all ImageGenerator drivers.
    */
   public function getImageGenerators() : Collection
   {
       return parent::getImageGenerators()->push(\App\ImageGenerators\PowerPoint::class);
   }
}