如何让“真正简单的验证码”以简单的联系方式工作？

时间：2014-01-21 14:58:22

标签： wordpress forms plugins captcha

我尝试根据this tutorial

创建一个简单的联系表单

为了避免垃圾邮件攻击，我尝试将该联系表单与really simple captcha plugin.

结合起来

使用以下代码，我可以在任何页面中使用短代码[contact]，表格显示但是在检查验证码时出现问题。

这是插件的代码：

function wptuts_get_the_ip() {
    if (isset($_SERVER["HTTP_X_FORWARDED_FOR"])) {
        return $_SERVER["HTTP_X_FORWARDED_FOR"];
    }
    elseif (isset($_SERVER["HTTP_CLIENT_IP"])) {
        return $_SERVER["HTTP_CLIENT_IP"];
    }
    else {
        return $_SERVER["REMOTE_ADDR"];
    }
}
// short code function 
function wptuts_contact_form_sc( $atts ) {     
add_shortcode( 'contact', 'contact_form_shortcode' );

   extract(shortcode_atts(array(
        "email" => get_bloginfo('admin_email'),
        "subject" => '',
        "label_name" => 'Your Name',
        "label_email" => 'Your E-mail Address',
        "label_subject" => 'Your Answer',
        "label_captcha" => 'Captcha',
        "label_submit" => 'Submit',
        "error_empty" => 'Please fill in all the required fields.',
        "error_noemail" => 'Please enter a valid e-mail address.',
        "success" => 'Thanks for your e-mail! We\'ll get back to you as soon as we can.'
    ), $atts));

    $captcha_instance = new ReallySimpleCaptcha(); //imports really simple captcha plugin
    $word = $captcha_instance->generate_random_word();
    $prefix = mt_rand();
    $image= $captcha_instance->generate_image( $prefix, $word );

    if ($_SERVER['REQUEST_METHOD'] == 'POST') {

        $error = false;
        $required_fields = array("your_name", "email", "captcha", "subject");

        foreach ($_POST as $field => $value) {
            if (get_magic_quotes_gpc()) {
                $value = stripslashes($value);
            }
            $form_data[$field] = strip_tags($value);
        }

        foreach ($required_fields as $required_field) {
            $value = trim($form_data[$required_field]);
            if(empty($value)) {
                $error = true;
                $result = $error_empty;
            }
        }

        if(!is_email($form_data['email'])) {
            $error = true;
            $result = $error_noemail;
        }

        if ($error == false) {

            $captcha_text=$form_data['captcha'];                
            $correct = $captcha_instance->check( $prefix, $captcha_text );

            if($correct==TRUE){

                $email_subject = "[" . get_bloginfo('name') . "] " . $form_data['subject'];
                $email_message = $form_data['captcha'] . "\n\nIP: " . wptuts_get_the_ip();
                $headers  = "From: ".$form_data['your_name']." <".$form_data['email'].">\n";
                $headers .= "Content-Type: text/plain; charset=UTF-8\n";
                $headers .= "Content-Transfer-Encoding: 8bit\n";
                wp_mail($email, $email_subject, $email_message, $headers);
                $result = $success;
                $sent = true;
            }
        }
    }

    if($result != "") {
        $info = '<div class="info">'.$result.'</div>';        
    }

    $email_form = '<form class="contact-form" method="post" action="'.get_permalink().'">
        <div>
            <label for="cf_name">'.$label_name.':</label>
            <input type="text" name="your_name" id="cf_name" size="50" maxlength="50" value="'.$form_data['your_name'].'" />
        </div>
        <div>
            <label for="cf_email">'.$label_email.':</label>
            <input type="text" name="email" id="cf_email" size="50" maxlength="50" value="'.$form_data['email'].'" />
        </div>
        <div>
            <label for="cf_subject">'.$label_subject.':</label>
            <input type="text" name="subject" id="cf_subject" size="50" maxlength="50" value="'.$subject.$form_data['subject'].'" />
        </div>
        <div>
            <label for="cf_message">'.$label_captcha.':</label>
            <input type="text" name="captcha" id="cf_message" size="50" maxlength="50" value=""/>
        </div>
        <div id="captcha"><span id="captcha_text">Captcha:</span><img id="captcha_image" src="'.plugins_url("really-simple-captcha/tmp/" . $image) . '" alt="" /></div>
        <div>
            <input type="submit" value="'.$label_submit.'" name="send" id="cf_send" />
        </div>

    </form>';

    if($sent == true) {
        return $info;
    } else {
        return $info.$email_form;
    }
} 
add_shortcode('contact', 'wptuts_contact_form_sc');

// add plugins style to frontend
function prize_game_contact_form() {
wp_register_style('prize_game_contact_form', plugins_url('css/style.css',__FILE__));
wp_enqueue_style('prize_game_contact_form');
}
add_action('wp_enqueue_scripts', 'prize_game_contact_form');

到目前为止，我没有添加$captcha_instance->remove( $prefix );因为它不能正常工作。似乎每次我点击提交按钮时都会创建一个新单词并且函数$captcha_instance->check()检查新单词是否等于输入字段中的验证码文本，但这些单词当然不匹配，因为它已经是新词。我不明白为什么单击提交按钮时会创建一个新单词。错误在哪里？

4 个答案:

答案 0 :(得分：1)

您使用的是Wordpress吗？不要试图重新发明轮子。

下载免费插件，例如Contact Form 7，其中包括支持Ajax（不需要页面刷新）的Askimet垃圾邮件过滤器以及CAPTCHA系统。

  • CAPTCHA的工作时间只有3 - 5年前的一半。

我的建议是：

  • 不要寻找简单，但要寻找有效的方法。

答案 1 :(得分：1)

我认为问题在于每次函数运行时都会生成一个新的$prefix。因此，无法运行check()或remove()，因为表单上使用的$prefix是新值。

在表单中，创建一个隐藏的输入字段，其值为$prefix。因此该值与表单一起发布。在表单发布后第二次运行该功能时，请使用发布的$prefix值执行check()和remove()。应该这样做。

这是一篇关于如何将Really Simple Captcha插件与我刚才提到的隐藏前缀字段集成到您的插件或主题中的详细文章：http://www.lost-in-code.com/platforms/wordpress/wordpress-plugins/wordpress-using-really-simple-captcha/

如果您需要任何帮助，请随时告诉我。

答案 2 :(得分：0)

如果您不使用WordPress，那么您可以查看simple form & captcha idea - 如果您可以抓住验证码部分，验证码变得异常复杂且过度设计时需要做的就是区分在大多数情况下，简单地介于人与非人之间。

答案 3 :(得分：0)

只有在检查用户答案的​​正确性后，才必须创建变量$ word，$ prefix和$ image，并且必须通过隐藏的输入字段传递$ prefix值。我还没有检查过，但这段代码现在应该可以使用了：

function wptuts_get_the_ip() {
    if (isset($_SERVER["HTTP_X_FORWARDED_FOR"])) {
        return $_SERVER["HTTP_X_FORWARDED_FOR"];
    }
    elseif (isset($_SERVER["HTTP_CLIENT_IP"])) {
        return $_SERVER["HTTP_CLIENT_IP"];
    }
    else {
        return $_SERVER["REMOTE_ADDR"];
    }
}
// short code function 
function wptuts_contact_form_sc( $atts ) {     
add_shortcode( 'contact', 'contact_form_shortcode' );

   extract(shortcode_atts(array(
        "email" => get_bloginfo('admin_email'),
        "subject" => '',
        "label_name" => 'Your Name',
        "label_email" => 'Your E-mail Address',
        "label_subject" => 'Your Answer',
        "label_captcha" => 'Captcha',
        "label_submit" => 'Submit',
        "error_empty" => 'Please fill in all the required fields.',
        "error_noemail" => 'Please enter a valid e-mail address.',
        "success" => 'Thanks for your e-mail! We\'ll get back to you as soon as we can.'
    ), $atts));

    $captcha_instance = new ReallySimpleCaptcha(); //imports really simple captcha plugin

    if ($_SERVER['REQUEST_METHOD'] == 'POST') {

        $error = false;
        $required_fields = array("your_name", "email", "captcha", "subject");

        foreach ($_POST as $field => $value) {
            if (get_magic_quotes_gpc()) {
                $value = stripslashes($value);
            }
            $form_data[$field] = strip_tags($value);
        }

        foreach ($required_fields as $required_field) {
            $value = trim($form_data[$required_field]);
            if(empty($value)) {
                $error = true;
                $result = $error_empty;
            }
        }

        if(!is_email($form_data['email'])) {
            $error = true;
            $result = $error_noemail;
        }

        if ($error == false) {

            $captcha_text=$form_data['captcha'];
            $captcha_prefix=$form_data['prefix'];
            $correct = $captcha_instance->check( $captcha_prefix, $captcha_text );

            if($correct==TRUE){

                $email_subject = "[" . get_bloginfo('name') . "] " . $form_data['subject'];
                $email_message = $form_data['captcha'] . "\n\nIP: " . wptuts_get_the_ip();
                $headers  = "From: ".$form_data['your_name']." <".$form_data['email'].">\n";
                $headers .= "Content-Type: text/plain; charset=UTF-8\n";
                $headers .= "Content-Transfer-Encoding: 8bit\n";
                wp_mail($email, $email_subject, $email_message, $headers);
                $result = $success;
                $sent = true;
            }
        }
    }

    $word = $captcha_instance->generate_random_word();        
    $prefix = mt_rand();
    $image= $captcha_instance->generate_image( $prefix, $word );

    if($result != "") {
        $info = '<div class="info">'.$result.'</div>';        
    }

    $email_form = '<form class="contact-form" method="post" action="'.get_permalink().'">
        <div>
            <label for="cf_name">'.$label_name.':</label>
            <input type="text" name="your_name" id="cf_name" size="50" maxlength="50" value="'.$form_data['your_name'].'" />
        </div>
        <div>
            <label for="cf_email">'.$label_email.':</label>
            <input type="text" name="email" id="cf_email" size="50" maxlength="50" value="'.$form_data['email'].'" />
        </div>
        <div>
            <label for="cf_subject">'.$label_subject.':</label>
            <input type="text" name="subject" id="cf_subject" size="50" maxlength="50" value="'.$subject.$form_data['subject'].'" />
        </div>
        <div>
            <label for="cf_message">'.$label_captcha.':</label>
            <input type="text" name="captcha" id="cf_message" size="50" maxlength="50" value=""/>
            <input type="hidden" name="prefix" id="prefix" value="'.$prefix.'"/>
        </div>
        <div id="captcha"><span id="captcha_text">Captcha:</span><img id="captcha_image" src="'.plugins_url("really-simple-captcha/tmp/" . $image) . '" alt="" /></div>
        <div>
            <input type="submit" value="'.$label_submit.'" name="send" id="cf_send" />
        </div>

    </form>';

    if($sent == true) {
        return $info;
    } else {
        return $info.$email_form;
    }
} 
add_shortcode('contact', 'wptuts_contact_form_sc');

// add plugins style to frontend
function prize_game_contact_form() {
wp_register_style('prize_game_contact_form', plugins_url('css/style.css',__FILE__));
wp_enqueue_style('prize_game_contact_form');
}
add_action('wp_enqueue_scripts', 'prize_game_contact_form');
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