Plugin to support Google Adsense

A plugin to easily add Google Adsense blocks to a StatusNet site.

diff --git a/plugins/Adsense/AdsensePlugin.php b/plugins/Adsense/AdsensePlugin.php
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+<?php
+/**
+ * StatusNet, the distributed open-source microblogging tool
+ *
+ * Plugin for Google Adsense
+ *
+ * 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  Ads
+ * @package   StatusNet
+ * @author    Evan Prodromou <evan@status.net>
+ * @copyright 2010 StatusNet Inc.
+ * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
+ * @link      http://status.net/
+ */
+
+if (!defined('STATUSNET')) {
+    exit(1);
+}
+
+/**
+ * Plugin to add Google Adsense to StatusNet sites
+ *
+ * This plugin lets you add Adsense ad units to your StatusNet site.
+ *
+ * We support the 4 ad sizes for the Universal Ad Platform (UAP):
+ *
+ *     Medium Rectangle
+ *     (Small) Rectangle
+ *     Leaderboard
+ *     Wide Skyscraper
+ *
+ * They fit in different places on the default theme. Some themes
+ * might interact quite poorly with this plugin.
+ *
+ * To enable advertising, you must sign up with Google Adsense and
+ * get a client ID.
+ *
+ *     https://www.google.com/adsense/
+ *
+ * You'll also need to create an Adsense for Content unit in one
+ * of the four sizes described above. At the end of the process,
+ * note the "google_ad_client" and "google_ad_slot" values in the
+ * resultant Javascript.
+ *
+ * Add the plugin to config.php like so:
+ *
+ *     addPlugin('Adsense', array('client' => 'Your client ID',
+ *                                'rectangle' => 'slot'));
+ *
+ * Here, your client ID is the value of google_ad_client and the
+ * slot is the value of google_ad_slot. Note that if you create
+ * a different size, you'll need to provide different arguments:
+ * 'mediumRectangle', 'leaderboard', or 'wideSkyscraper'.
+ *
+ * If for some reason your ad server is different from the default,
+ * use the 'adScript' parameter to set the full path to the ad script.
+ *
+ * @category Plugin
+ * @package  StatusNet
+ * @author   Evan Prodromou <evan@status.net>
+ * @license  http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
+ * @link     http://status.net/
+ *
+ * @seeAlso  UAPPlugin
+ */
+
+class AdsensePlugin extends UAPPlugin
+{
+    public $adScript = 'http://pagead2.googlesyndication.com/pagead/show_ads.js';
+    public $client   = null;
+
+    /**
+     * Show a medium rectangle 'ad'
+     *
+     * @param Action $action Action being shown
+     *
+     * @return void
+     */
+
+    protected function showMediumRectangle($action)
+    {
+        $this->showAdsenseCode($action, 300, 250, $this->mediumRectangle);
+    }
+
+    /**
+     * Show a rectangle 'ad'
+     *
+     * @param Action $action Action being shown
+     *
+     * @return void
+     */
+
+    protected function showRectangle($action)
+    {
+        $this->showAdsenseCode($action, 180, 150, $this->rectangle);
+    }
+
+    /**
+     * Show a wide skyscraper ad
+     *
+     * @param Action $action Action being shown
+     *
+     * @return void
+     */
+
+    protected function showWideSkyscraper($action)
+    {
+        $this->showAdsenseCode($action, 160, 600, $this->wideSkyscraper);
+    }
+
+    /**
+     * Show a leaderboard ad
+     *
+     * @param Action $action Action being shown
+     *
+     * @return void
+     */
+
+    protected function showLeaderboard($action)
+    {
+        $this->showAdsenseCode($action, 728, 90, $this->leaderboard);
+    }
+
+    /**
+     * Output the bits of JavaScript code to show Adsense
+     *
+     * @param Action  $action Action being shown
+     * @param integer $width  Width of the block
+     * @param integer $height Height of the block
+     * @param string  $slot   Slot identifier
+     *
+     * @return void
+     */
+
+    protected function showAdsenseCode($action, $width, $height, $slot)
+    {
+        $code  = 'google_ad_client = "'.$this->client.'"; ';
+        $code .= 'google_ad_slot = "'.$slot.'"; ';
+        $code .= 'google_ad_width = "'.$width.'"; ';
+        $code .= 'google_ad_height = "'.$height.'"; ';
+
+        $action->inlineScript($code);
+
+        $action->script($this->adScript);
+    }
+}
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