activate.php

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<?php
$plugin_guids = get_input('plugin_guids', []);

if (!is_array($plugin_guids)) {
    $plugin_guids = [$plugin_guids];
}

$activated_plugins = [];
foreach ($plugin_guids as $guid) {
    $plugin = get_entity($guid);

    if (!($plugin instanceof ElggPlugin)) {
        elgg_register_error_message(elgg_echo('admin:plugins:activate:no', [$guid]));
        continue;
    }

    try {
        if (!$plugin->activate()) {
            elgg_register_error_message(elgg_echo('admin:plugins:activate:no', [$plugin->getDisplayName()]));
            continue;
        }
    } catch (\Elgg\Exceptions\PluginException $e) {
        elgg_register_error_message(elgg_echo('admin:plugins:activate:no_with_msg', [$plugin->getDisplayName(), $e->getMessage()]));
        continue;
    }
    
    $ids = [
        'cannot_start' . $plugin->getID(),
        'invalid_and_deactivated_' . $plugin->getID()
    ];

    foreach ($ids as $id) {
        elgg_delete_admin_notice($id);
    }
    
    $activated_plugins[] = $plugin;
}

if (empty($activated_plugins)) {
    return elgg_error_response();
}

if (count($activated_plugins) === 1) {
    $plugin = $activated_plugins[0];
    
    $url = elgg_http_build_url([
        'path' => 'admin/plugins',
        'query' => parse_url($_SERVER['HTTP_REFERER'], PHP_URL_QUERY),
        'fragment' => preg_replace('/[^a-z0-9-]/i', '-', $plugin->getID()),
    ]);
        
    return elgg_ok_response('', '', $url);
}

return elgg_ok_response();