WpUpdater.php

<?php namespace NZTim\Connect\WordPress;

use WP_Filesystem_Base;

/** Adapted from https://www.smashingmagazine.com/2015/08/deploy-wordpress-plugins-with-github-using-transients/ */
class Updater
{
    /** @var string */
    protected $pluginFile;
    /** @var array */
    protected $pluginData;
    /** @var string */
    protected $basename;
    /** @var bool */
    protected $active;
    /** @var string */
    private $user;
    /** @var string */
    private $repo;
    /** @var array */
    private $githubResponse;

    public function __construct(string $pluginFile, string $user, string $repo)
    {
        $this->pluginFile = $pluginFile;
        $this->user = $user;
        $this->repo = $repo;
    }

    public static function addAction(string $pluginFile, string $user, string $repo)
    {
        $instance = new static($pluginFile, $user, $repo);
        add_action('admin_init', [$instance, 'setPluginProperties']);
        add_filter('pre_set_site_transient_update_plugins', [$instance, 'modifyTransient'], 10, 1);
        add_filter('plugins_api', [$instance, 'pluginPopup'], 10, 3);
        add_filter('upgrader_post_install', [$instance, 'afterInstall'], 10, 3);
    }

    public function setPluginProperties()
    {
        $this->pluginData = get_plugin_data($this->pluginFile);
        $this->basename = plugin_basename($this->pluginFile);
        $this->active = is_plugin_active($this->basename);
    }

    public function modifyTransient($transient)
    {
        if (property_exists($transient, 'checked')) {
            $checked = $transient->checked;
            if ($checked) {
                $this->getRepositoryInfo();
                $outdated = version_compare($this->githubResponse['tag_name'], $checked[$this->basename], 'gt');
                if ($outdated) {
                    $new = $this->githubResponse['zipball_url'];
                    $slug = current(explode('/', $this->basename));
                    $plugin = [
                        'url'         => $this->pluginData["PluginURI"],
                        'slug'        => $slug,
                        'package'     => $new,
                        'new_version' => $this->githubResponse['tag_name'],
                    ];
                    $transient->response[$this->basename] = (object) $plugin;
                }
            }
        }
        return $transient;
    }

    protected function getRepositoryInfo()
    {
        if (is_null($this->githubResponse)) {
            $url = sprintf('https://api.github.com/repos/%s/%s/releases', $this->user, $this->repo); // Build URI
            $response = json_decode(wp_remote_retrieve_body(wp_remote_get($url)), true);
            if (is_array($response)) {
                $response = current($response);
            }
            $this->githubResponse = $response;
        }
    }

    public function pluginPopup($result, $action, $args)
    {
        if ($args->slug == current(explode('/', $this->basename))) {
            $this->getRepositoryInfo();
            $plugin = [
                'name'              => $this->pluginData["Name"],
                'slug'              => $this->basename,
                'version'           => $this->githubResponse['tag_name'],
                'author'            => $this->pluginData["AuthorName"],
                'author_profile'    => $this->pluginData["AuthorURI"],
                'last_updated'      => $this->githubResponse['published_at'],
                'homepage'          => $this->pluginData["PluginURI"],
                'short_description' => $this->pluginData["Description"],
                'sections'          => [
                    'Description' => $this->pluginData["Description"],
                    'Updates'     => $this->githubResponse['body'],
                ],
                'download_link'     => $this->githubResponse['zipball_url'],
            ];
            return (object) $plugin;
        }
        return $result;
    }

    public function afterInstall($response, $hook_extra, $result)
    {
        /** @var WP_Filesystem_Base $wp_filesystem */
        global $wp_filesystem;
        $installDir = plugin_dir_path($this->pluginFile);
        $wp_filesystem->move($result['destination'], $installDir);
        $result['destination'] = $installDir;
        if ($this->active) {
            activate_plugin($this->basename);
        }
        return $result;
    }
}