First version of blogspam.net plugin

Added a plugin for blogspam.net. The service is kind of aggressive,
so by default I turn a lot of the tests off. But worth a look.

diff --git a/plugins/BlogspamNetPlugin.php b/plugins/BlogspamNetPlugin.php
new file mode 100644 (file)
index 0000000..d9372bc
--- /dev/null
+++ b/plugins/BlogspamNetPlugin.php
@@ -0,0 +1,144 @@
+<?php
+/**
+ * Laconica, the distributed open-source microblogging tool
+ *
+ * Plugin to check submitted notices with blogspam.net
+ *
+ * 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  Plugin
+ * @package   Laconica
+ * @author    Evan Prodromou <evan@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);
+}
+
+define('BLOGSPAMNETPLUGIN_VERSION', '0.1');
+
+/**
+ * Plugin to check submitted notices with blogspam.net
+ *
+ * When new notices are saved, we check their text with blogspam.net (or
+ * a compatible service).
+ *
+ * Blogspam.net is supposed to catch blog comment spam, and I found that
+ * some of its tests (min/max size, bayesian match) gave a lot of false positives.
+ * So, I've turned those tests off by default. This may not get as many
+ * hits, but it's better than nothing.
+ *
+ * @category Plugin
+ * @package  Laconica
+ * @author   Evan Prodromou <evan@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      Event
+ */
+
+class BlogspamNetPlugin extends Plugin
+{
+    var $baseUrl = 'http://test.blogspam.net:8888/';
+
+    function __construct($url=null)
+    {
+        parent::__construct();
+        if ($url) {
+            $this->baseUrl = $url;
+        }
+    }
+
+    function onStartNoticeSave($notice)
+    {
+        $args = $this->testArgs($notice);
+        common_debug("Blogspamnet args = " . print_r($args, TRUE));
+        $request = xmlrpc_encode_request('testComment', array($args));
+        $context = stream_context_create(array('http' => array('method' => "POST",
+                                                               'header' =>
+                                                               "Content-Type: text/xml\r\n".
+                                                               "User-Agent: " . $this->userAgent(),
+                                                               'content' => $request)));
+        $file = file_get_contents($this->baseUrl, false, $context);
+        $response = xmlrpc_decode($file);
+        if (xmlrpc_is_fault($response)) {
+            throw new ServerException("$response[faultString] ($response[faultCode])", 500);
+        } else {
+            common_debug("Blogspamnet results = " . $response);
+            if (preg_match('/^ERROR(:(.*))?$/', $response, $match)) {
+                throw new ServerException(sprintf(_("Error from %s: %s"), $this->baseUrl, $match[2]), 500);
+            } else if (preg_match('/^SPAM(:(.*))?$/', $response, $match)) {
+                throw new ClientException(sprintf(_("Spam checker results: %s"), $match[2]), 400);
+            } else if (preg_match('/^OK$/', $response)) {
+                // don't do anything
+            } else {
+                throw new ServerException(sprintf(_("Unexpected response from %s: %s"), $this->baseUrl, $response), 500);
+            }
+        }
+        return true;
+    }
+
+    function testArgs($notice)
+    {
+        $args = array();
+        $args['comment'] = $notice->content;
+        $args['ip'] = $this->getClientIP();
+
+        if (isset($_SERVER) && array_key_exists('HTTP_USER_AGENT', $_SERVER)) {
+            $args['agent'] = $_SERVER['HTTP_USER_AGENT'];
+        }
+
+        $profile = $notice->getProfile();
+
+        if ($profile && $profile->homepage) {
+            $args['link'] = $profile->homepage;
+        }
+
+        if ($profile && $profile->fullname) {
+            $args['name'] = $profile->fullname;
+        } else {
+            $args['name'] = $profile->nickname;
+        }
+
+        $args['site'] = common_root_url();
+        $args['version'] = $this->userAgent();
+
+        $args['options'] = "max-size=140,min-size=0,min-words=0,exclude=bayasian";
+
+        return $args;
+    }
+
+    function getClientIP()
+    {
+        if (isset($_SERVER) && array_key_exists('REQUEST_METHOD', $_SERVER)) {
+            // Note: order matters here; use proxy-forwarded stuff first
+            foreach (array('HTTP_X_FORWARDED_FOR', 'CLIENT-IP', 'REMOTE_ADDR') as $k) {
+                if (isset($_SERVER[$k])) {
+                    return $_SERVER[$k];
+                }
+            }
+        }
+        return '127.0.0.1';
+    }
+
+    function userAgent()
+    {
+        return 'BlogspamNetPlugin/'.BLOGSPAMNETPLUGIN_VERSION . ' Laconica/' . LACONICA_VERSION;
+    }
+}