Locator.php

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<?php

namespace Elgg\Upgrade;

use Elgg\Database\Plugins;
use Elgg\Exceptions\InvalidArgumentException;
use Elgg\Includer;
use Elgg\Project\Paths;

class Locator {

    private $plugins;

    public function __construct(Plugins $plugins) {
        $this->plugins = $plugins;
    }

    public function locate() {
        $pending_upgrades = [];

        // Check for core upgrades
        $core_upgrades = Includer::includeFile(Paths::elgg() . 'engine/upgrades.php');

        foreach ($core_upgrades as $class) {
            $upgrade = $this->getUpgrade($class, 'core');
            if ($upgrade) {
                $pending_upgrades[] = $upgrade;
            }
        }

        $plugins = $this->plugins->find('active');

        // Check for plugin upgrades
        foreach ($plugins as $plugin) {
            $batches = $plugin->getStaticConfig('upgrades');

            if (empty($batches)) {
                continue;
            }

            $plugin_id = $plugin->getID();

            foreach ($batches as $class) {
                $upgrade = $this->getUpgrade($class, $plugin_id);
                if ($upgrade) {
                    $pending_upgrades[] = $upgrade;
                }
            }
        }

        return $pending_upgrades;
    }

    public function getUpgrade($class, $component_id) {

        $batch = $this->getBatch($class);

        $version = $batch->getVersion();
        $upgrade_id = "{$component_id}:{$version}";

        $upgrade = $this->upgradeExists($upgrade_id);

        if (!$upgrade) {
            $upgrade = elgg_call(ELGG_IGNORE_ACCESS, function () use ($upgrade_id, $class, $component_id, $version) {
                $site = elgg_get_site_entity();

                // Create a new ElggUpgrade to represent the upgrade in the database
                $upgrade = new \ElggUpgrade();
                $upgrade->owner_guid = $site->guid;
                $upgrade->container_guid = $site->guid;

                $upgrade->setId($upgrade_id);
                $upgrade->setClass($class);
                $upgrade->title = "{$component_id}:upgrade:{$version}:title";
                $upgrade->description = "{$component_id}:upgrade:{$version}:description";
                $upgrade->offset = 0;
                $upgrade->save();

                return $upgrade;
            });
        }

        return $upgrade;
    }

    public function getBatch($class) {
        if (!class_exists($class)) {
            throw new InvalidArgumentException("Upgrade class $class was not found");
        }

        if (!is_subclass_of($class, Batch::class)) {
            throw new InvalidArgumentException("Upgrade class $class should implement " . Batch::class);
        }

        return new $class;
    }

    public function upgradeExists($upgrade_id) {
        return elgg_call(ELGG_IGNORE_ACCESS, function () use ($upgrade_id) {
            $upgrades = \Elgg\Database\Entities::find([
                'type' => 'object',
                'subtype' => 'elgg_upgrade',
                'private_setting_name_value_pairs' => [
                    [
                        'name' => 'id',
                        'value' => (string) $upgrade_id,
                    ],
                ],
            ]);

            return $upgrades ? $upgrades[0] : false;
        });
    }

    public function getUpgradeByClass(string $class_name) {
        return elgg_call(ELGG_IGNORE_ACCESS, function () use ($class_name) {
            $upgrades = \Elgg\Database\Entities::find([
                'type' => 'object',
                'subtype' => 'elgg_upgrade',
                'private_setting_name_value_pairs' => [
                    [
                        'name' => 'class',
                        'value' => $class_name,
                    ],
                ],
            ]);

            return $upgrades ? $upgrades[0] : false;
        });
    }
}