ImageUploadsFormRequest.php

<?php

namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;
use Illuminate\Http\UploadedFile;
use Illuminate\Support\Arr;
use Illuminate\Support\Facades\File;
use Illuminate\Support\Str;

class ImageUploadsFormRequest extends FormRequest
{
    protected function prepareForValidation()
    {
        $input = $this->all();

        if (!isset($input['image'])) {
            return;
        }

        if (Str::startsWith($input['image'], 'data:image')) {
            $file = $this->makeFromBase64($input['image']);
            $input['image'] = $file;
        }

        $this->replace($input);
    }

    protected function makeFromBase64($content)
    {
        $content = Arr::last(explode(',', $content));
        $content = base64_decode($content);
        $mimeType = finfo_buffer(finfo_open(), $content, FILEINFO_MIME_TYPE);
        $extension = finfo_buffer(finfo_open(), $content, FILEINFO_EXTENSION);
        $size = strlen($content);
        $name = uniqid('img_') . '.' . $extension;
        $path = tempnam(sys_get_temp_dir(), uniqid('img-', true));
        File::put($path, $content);

        return app(UploadedFile::class, [
            'path' => $path,
            'originalName' => $name,
            'mimeType' => $mimeType,
            'size' => $size,
            'error' => null,
            'test' => true,
        ]);
    }
}