Form class, superclass for form widgets

diff --git a/lib/form.php b/lib/form.php
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+<?php
+/**
+ * Laconica, the distributed open-source microblogging tool
+ *
+ * Base class for forms
+ *
+ * PHP version 5
+ *
+ * LICENCE: This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @category  Widget
+ * @package   Laconica
+ * @author    Evan Prodromou <evan@controlyourself.ca>
+ * @author    Sarven Capadisli <csarven@controlyourself.ca>
+ * @copyright 2009 Control Yourself, Inc.
+ * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
+ * @link      http://laconi.ca/
+ */
+
+if (!defined('LACONICA')) {
+    exit(1);
+}
+
+require_once INSTALLDIR.'/lib/widget.php';
+
+/**
+ * Base class for forms
+ *
+ * We have a lot of common forms (subscribe, fave, delete) and this superclass
+ * lets us abstract out the basic features of the form.
+ *
+ * @category Widget
+ * @package  Laconica
+ * @author   Evan Prodromou <evan@controlyourself.ca>
+ * @author   Sarven Capadisli <csarven@controlyourself.ca>
+ * @license  http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
+ * @link     http://laconi.ca/
+ *
+ * @see      HTMLOutputter
+ */
+
+class Form extends Widget
+{
+    /**
+     * Show the form
+     *
+     * Uses a recipe to output the form.
+     *
+     * @return void
+     * @see Widget::show()
+     */
+
+    function show()
+    {
+        $this->out->elementStart('form',
+                                 array('id' => $this->id(),
+                                       'method' => 'POST',
+                                       'action' => $this->action()));
+        $this->sessionToken();
+        $this->formData();
+        $this->formActions();
+        $this->out->elementEnd('form');
+    }
+
+    /**
+     * Include a session token for CSRF protection
+     *
+     * @return void
+     */
+
+    function sessionToken()
+    {
+        $this->out->hidden('token', common_session_token());
+    }
+
+    /**
+     * Visible or invisible data elements
+     *
+     * Display the form fields that make up the data of the form.
+     * Sub-classes should overload this to show their data.
+     *
+     * @return void
+     */
+
+    function formData()
+    {
+    }
+
+    /**
+     * Buttons for form actions
+     *
+     * Submit and cancel buttons (or whatever)
+     * Sub-classes should overload this to show their own buttons.
+     *
+     * @return void
+     */
+
+    function formActions()
+    {
+    }
+
+    /**
+     * ID of the form
+     *
+     * Should be unique on the page. Sub-classes should overload this
+     * to show their own IDs.
+     *
+     * @return int ID of the form
+     */
+
+    function id()
+    {
+        return null;
+    }
+
+    /**
+     * Action of the form.
+     *
+     * URL to post to. Should be overloaded by subclasses to give
+     * somewhere to post to.
+     *
+     * @return string URL to post to
+     */
+
+    function action()
+    {
+    }
+}