Base 64 Image Validator in Laravel

Base64ServiceProvider.php

<?php

namespace App\Providers;

use Illuminate\Support\ServiceProvider;
use Validator;

class Base64ServiceProvider extends ServiceProvider
{
    /**
     * Bootstrap services.
     *
     * @return void
     */
    public function boot()
    {
			Validator::extend('image64', 'App\Validators\Base64Validator@validateBase64');
    }

    /**
     * Register services.
     *
     * @return void
     */
    public function register()
    {
        //
    }
}

Base64Validator.php

<?php

namespace App\Validators;

class Base64Validator
{
	/**
	 * Check if the file is in base64 image
	 */
	public function validateBase64($attribute, $value, $parameters, $validator)
	{
		$explode = $this->explodeString($value);
		$allow = $this->allowedFormat();
		$format = $this->dataFormat($explode);

		// check file format
		if (!in_array($format, $allow)) {
				return false;
		}

		// check base64 format
		if (!preg_match('%^[a-zA-Z0-9/+]*={0,2}$%', $explode[1])) {
				return false;
		}

		return true;
	}

	/**
	 * Check the data format
	 */
	public function dataFormat($explode)
	{
		return str_replace(
			[
					'data:image/',
					';',
					'base64',
			],
			[
					'', '', '',
			],
			$explode[0]
		);
	}

	/**
	 * The allowed format in base 64 image
	 */
	public function allowedFormat()
	{
		return ['gif', 'jpg', 'jpeg', 'png'];
	}

	/**
	 * Explode base 64 image
	 */
	public function explodeString($value)
	{
		return explode(',', $value);
	}
}

validation.php

		'image64' 						 => 'The :attribute must be a valid base-64 string.',