root/trunk/plugins/recaptcha.php

<?php
Class recaptcha extends MvBlog_plugin implements MvBlog_pluginiface {
    /* variables */
    public $name    = "recaptcha";
    public $author  = "Michiel van Baak";
    public $license = "GPL";
    public $website = "http://www.mvblog.org";
    public $description = "reCAPTCHA captcha plugin.";

    private $_mvblog;
    private $_settings = array(
        "recaptcha_pubkey"  => "",
        "recaptcha_privkey" => ""
    );

    /* methods */
    public function __construct(&$mvblog) {
        $this->addHook("captcha_output", "show_captcha");
        $this->addHook("captcha_check", "check_captcha");
        $this->_mvblog =& $mvblog;
    }

    public function activate() {
        /* populate some settings */
        $sql = "SELECT * FROM settings WHERE settingname LIKE 'recaptcha_%'";
        $res = $this->_mvblog->db->query($sql);
        while ($row = $res->fetchRow(MDB2_FETCHMODE_ASSOC)) {
            $this->_settings[$row["settingname"]] = $row["settingvalue"];
        }

    }

    public function deactivate() {
        /* destroy settings */
        unset($this->_settings);
    }

    public function show_captcha() {
        require_once("recaptcha_files/recaptchalib.php");
        return recaptcha_get_html($this->_settings["recaptcha_pubkey"]);
    }

    public function check_captcha($data) {
        require_once("recaptcha_files/recaptchalib.php");
        $res = recaptcha_check_answer($this->_settings["recaptcha_privkey"],
            $_SERVER["REMOTE_ADDR"],
            $_POST["recaptcha_challenge_field"],
            $_POST["recaptcha_response_field"]);
        return $res->is_valid;
    }
    /* show_settings {{{ */
    public function show_settings() {
        $output  = "<form name=\"recaptcha_settings\" method=\"post\" action=\"index.php\">";
        $output .= "<input type=\"hidden\" name=\"action\" value=\"save_plugin_setting\" />";
        $output .= "<input type=\"hidden\" name=\"plugin\" value=\"recaptcha\" />";
        $output .= "<table style=\"width: 220px;\"><tr>";
        $output .= "<td>".gettext("Public reCAPTCHA key")."</td>";
        $output .= "<td><input type=\"text\" name=\"recaptcha_pubkey\" value=\"".$this->_settings["recaptcha_pubkey"]."\" /></td>";
        $output .= "</tr><tr>";
        $output .= "<td>".gettext("Private reCAPTCHA key")."</td>";
        $output .= "<td><input type=\"text\" name=\"recaptcha_privkey\" value=\"".$this->_settings["recaptcha_privkey"]."\" /></td>";
        $output .= "</tr><tr>";
        $output .= "<td colspan=\"2\"><input type=\"submit\" value=\"".gettext("Save")."\" /></td>";
        $output .= "</tr></table>";

        $output .= "</form>";
        echo $output;
    }
    /* }}} */
    /* save_setting {{{ */
    public function save_setting($requestdata) {
        /* first look if the setting is already there */
        $sql = "SELECT COUNT(*) FROM settings WHERE settingname = 'recaptcha_privkey'";
        $res = $this->_mvblog->db->query($sql);
        $row = $res->fetchRow();
        if ($row[0]) {
            /* yes, so update */
            $sql = sprintf("UPDATE settings SET settingvalue='%s' WHERE settingname='recaptcha_privkey'", $requestdata["recaptcha_privkey"]);
        } else {
            /* no, so insert */
            $sql = sprintf("INSERT INTO settings (settingname, settingvalue) VALUES ('recaptcha_privkey', '%s')", $requestdata["recaptcha_privkey"]);
        }
        $res = $this->_mvblog->db->exec($sql);
        $this->_settings["recaptcha_privkey"] = sprintf("%s", $requestdata["recaptcha_privkey"]);
        /* first look if the setting is already there */
        $sql = "SELECT COUNT(*) FROM settings WHERE settingname = 'recaptcha_pubkey'";
        $res = $this->_mvblog->db->query($sql);
        $row = $res->fetchRow();
        if ($row[0]) {
            /* yes, so update */
            $sql = sprintf("UPDATE settings SET settingvalue='%s' WHERE settingname='recaptcha_pubkey'", $requestdata["recaptcha_pubkey"]);
        } else {
            /* no, so insert */
            $sql = sprintf("INSERT INTO settings (settingname, settingvalue) VALUES ('recaptcha_pubkey', '%s')", $requestdata["recaptcha_pubkey"]);
        }
        $res = $this->_mvblog->db->exec($sql);
        $this->_settings["recaptcha_pubkey"] = sprintf("%s", $requestdata["recaptcha_pubkey"]);
        $this->show_settings();
    }
    /* }}} */
}
?>