activate.php

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<?php
$plugin_guids = get_input('plugin_guids');

if (!is_array($plugin_guids)) {
    $plugin_guids = array($plugin_guids);
}

$activated_guids = array();
foreach ($plugin_guids as $guid) {
    $plugin = get_entity($guid);

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

    if ($plugin->activate()) {
        $activated_guids[] = $guid;
        $ids = array(
            'cannot_start' . $plugin->getID(),
            'invalid_and_deactivated_' . $plugin->getID()
        );

        foreach ($ids as $id) {
            elgg_delete_admin_notice($id);
        }

    } else {
        $msg = $plugin->getError();
        $string = ($msg) ? 'admin:plugins:activate:no_with_msg' : 'admin:plugins:activate:no';
        register_error(elgg_echo($string, array($plugin->getFriendlyName(), $plugin->getError())));
    }
}

// don't regenerate the simplecache because the plugin won't be
// loaded until next run.  Just invalidate and let it regenerate as needed
elgg_flush_caches();

if (count($activated_guids) === 1) {
    $url = 'admin/plugins';
    $query = (string)parse_url($_SERVER['HTTP_REFERER'], PHP_URL_QUERY);
    if ($query) {
        $url .= "?$query";
    }
    $plugin = get_entity($plugin_guids[0]);
    $id = $css_id = preg_replace('/[^a-z0-9-]/i', '-', $plugin->getID());
    $url = "$url#id";
    return elgg_ok_response('', '', $url);
} else {
    // forward to top of page with a failure so remove any #foo
    $url = $_SERVER['HTTP_REFERER'];
    if (strpos($url, '#')) {
        $url = substr(0, strpos($url, '#'));
    }
    forward(elgg_normalize_site_url($url));
}