aMember: example of plugin that add new widget to user dashboard

block-expire-date.php

<?php

class Am_Plugin_BlockExpireDate extends Am_Plugin
{
    const PLUGIN_STATUS = self::STATUS_PRODUCTION;
    const PLUGIN_COMM = self::COMM_COMMERCIAL;
    const PLUGIN_REVISION = '@@VERSION@@';

    const DEFAULT_TPL = '<div class="am-info">Greetings %user.name_f% &mdash; your subscription expires on %expire|date%</div>';

    protected $_configPrefix = 'misc.';

    function _initSetupForm(Am_Form_Setup $form)
    {
        $form->setTitle(___('Expire Date Block'));
        $form->addMagicSelect('pids')
            ->setLabel(___("Products\nuser with specified products will see a block"))
            ->loadOptions($this->getDi()->productTable->getProductOptions())
            ->addRule('required');
        $form->addHtmlEditor('tmpl', null, array('showInPopup' => true))
            ->setLabel('Widget Template');

        $form->setDefault('tmpl', self::DEFAULT_TPL);
    }

    function isConfigured()
    {
        return (bool) $this->getConfig('pids');
    }

    function hasAccess(User $user)
    {
        if (!$pids = $this->getConfig('pids')) return false;

        return (bool) array_intersect($user->getActiveProductIds(), $this->getDi()->productTable->extractProductIds($pids));
    }

    function getExpire(User $user)
    {
        return $user->getExpire($this->getDi()->productTable->extractProductIds($this->getConfig('pids')));
    }

    function renderBlock(Am_View $view)
    {
        $user = $this->getDi()->user;
        $expire = $this->getExpire($user);

        $tpl = new Am_SimpleTemplate;
        $tpl->assignStdVars();
        $tpl->assign(array(
            'user' => $user,
            'expire' => $expire
        ));

        return $tpl->render($this->getConfig('tmpl', self::DEFAULT_TPL));
    }

    function onInitFinished(Am_Event $e)
    {
        if ($this->getDi()->auth->getUserId() &&
            $this->hasAccess($this->getDi()->user)) {

            $this->getDi()->blocks->remove('member-main-resources');
            $this->getDi()->blocks->add(new Am_Block('member/main/top', null, 'member-expire-date', $this, array($this, 'renderBlock')));
        }
    }
}

Very usefull

@tarikhagustia Thank you!