grav-plugin-cloudinary/cloudinary.php

<?php
namespace Grav\Plugin;

use Grav\Common\Plugin;
use RocketTheme\Toolbox\Event\Event;

class CloudinaryPlugin extends Plugin
{
    protected $cloudinary;

    public static function getSubscribedEvents()
    {
        return [
            'onPluginsInitialized' => ['onPluginsInitialized', 0],
        ];
    }

    /**
     * Activate plugin if path matches to the configured one.
     */
    public function onPluginsInitialized()
    {
        if ($this->isAdmin()) {
            $this->active = false;
            return;
        }

        include __DIR__.'/vendor/autoload.php';

        \Cloudinary::config([
            "cloud_name"    => $this->config->get('plugins.cloudinary.cloud_name'),
            "api_key"       => $this->config->get('plugins.cloudinary.api_key'),
            "api_secret"    => $this->config->get('plugins.cloudinary.api_secret'),
        ]);

        $this->enable([
            'onImageMediumSaved' => ['onImageMediumSaved', 0],
        ]);
    }


    public function onImageMediumSaved(Event $event)
    {

        $path = $event['image'];
        $cloudinary_image = \Cloudinary\Uploader::upload($path);

        if (!empty($cloudinary_image)) {
            file_put_contents($path, $cloudinary_image['secure_url']);
        }
    }
}