Validator extension for Image Data URI

image_data_uri_validation_rule.php

<?php

Validator::extend('image_uri', function($attribute, $value, $parameters, $validator) {
    $matches = [];
    $pattern = '/^data:image\/(jpe?g|png|bmp|gif|svg);base64\,.+$/';

    return preg_match($pattern, $value, $matches) > 0 && in_array($matches[1], $parameters);
});

Usage:

Validator::make($request->all(), [
    'picture' => 'image_uri:png,jpg'
]);