Plugin.php

<?php
/**
 * reCAPTCHA验证码插件
 *
 * @package reCAPTCHA
 * @author 啸傲居士
 * @version 0.0.1
 * @link http://geaya.com
 */


class reCAPTCHA_Plugin implements Typecho_Plugin_Interface
{

    /**
     * 激活插件方法,如果激活失败,直接抛出异常
     *
     * @access public
     * @return void
     * @throws Typecho_Plugin_Exception
     */
    	public static function activate() {
	Typecho_Plugin::factory('Widget_Feedback')->comment = array(__CLASS__, 'filter');
    }

    /**
     * 禁用插件方法,如果禁用失败,直接抛出异常
     *
     * @static
     * @access public
     * @return void
     * @throws Typecho_Plugin_Exception
     */
    	public static function deactivate() {}

    /**
     * 个人用户的配置面板
     *
     * @access public
     * @param Typecho_Widget_Helper_Form $form
     * @return void
     */
    	public static function personalConfig(Typecho_Widget_Helper_Form $form) {}

    /**
     * 获取插件配置面板
     *
     * @access public
     * @param Typecho_Widget_Helper_Form $form 配置面板
     * @return void
     */
	public static function config(Typecho_Widget_Helper_Form $form) {
		$siteKeyDescription = _t("To use reCAPTCHA you must get an API key from <a href='https://www.google.com/recaptcha/admin/create'>https://www.google.com/recaptcha/admin/create</a>");
		$siteKey = new Typecho_Widget_Helper_Form_Element_Text('siteKey', NULL, '', _t('Site Key for reCAPTCHAv2:'), $siteKeyDescription);
		$secretKey = new Typecho_Widget_Helper_Form_Element_Text('secretKey', NULL, '', _t('Serect Key for reCAPTCHAv2:'), _t(''));
		$form->addInput($siteKey);
		$form->addInput($secretKey);
	}

	/**
	 * 展示验证码
	 */
	public static function output() {
		$siteKey = Typecho_Widget::widget('Widget_Options')->plugin('reCAPTCHA')->siteKey;
		$secretKey = Typecho_Widget::widget('Widget_Options')->plugin('reCAPTCHA')->secretKey;
      		if ($siteKey != "" && $secretKey != "") {
        		echo '<script src="https://recaptcha.net/recaptcha/api.js" async defer data-no-instant></script>
                              <div class="g-recaptcha" data-sitekey=' . $siteKey . '></div>';
      		} else {
			throw new Typecho_Widget_Exception(_t('No reCAPTCHA Site/Secret Keys! Please set it/them!'));
		}
  	}

	public static function filter($comments, $obj) {
    		$userObj = $obj->widget('Widget_User');
    		if($userObj->hasLogin() && $userObj->pass('administrator', true)) {
      			return $comments;
    		}
	  	elseif (isset($_POST['g-recaptcha-response'])) {
			$siteKey = Typecho_Widget::widget('Widget_Options')->plugin('reCAPTCHA')->siteKey;
			$secretKey = Typecho_Widget::widget('Widget_Options')->plugin('reCAPTCHA')->secretKey;
			function getCaptcha($recaptcha_response, $secretKey) {
				$response = file_get_contents("https://recaptcha.net/recaptcha/api/siteverify?secret=".$secretKey."&response=".$recaptcha_response);
				$response = json_decode($response);
				return $response;
			}
			$resp = getCaptcha($_POST['g-recaptcha-response'], $secretKey);
			if ($resp->success == true) {
				return $comments;
			} else {
			switch ($resp->error-codes) {
			case '{[0] => "timeout-or-duplicate"}':
				throw new Typecho_Widget_Exception(_t('验证时间超过2分钟或连续重复发言！'));
				break;
			case '{[0] => "invalid-input-secret"}':
				throw new Typecho_Widget_Exception(_t('博主填了无效的siteKey或者secretKey...'));
				break;
                        case '{[0] => "bad-request"}':
                                throw new Typecho_Widget_Exception(_t('请求错误！请检查网络'));
                                break;
			default:
				throw new Typecho_Widget_Exception(_t('很遗憾，您被当成了机器人...'));
			}
			}
		} else {
      			throw new Typecho_Widget_Exception(_t('未成功加载验证码！请科学上网！'));
	  	}
  	}
}