驗證碼 Captcha

[NINJA]

1.中文驗證碼
當 images/seccode/font/ch 目錄放2個中文字型時,驗證碼會隨機使用字型
[ DiscuzX static/image/seccode/font/ch ]
2.圖片驗證碼
可以自製GIF圖片 1-9 a-z
放到 images/seccode/gif/任意目錄名/*.gif
當有2個GIF圖片目錄以上時,就會隨機挑選目錄裡的GIF檔
3.Flash驗證碼
會把圖片以Flash撥放顯示

修改驗證碼
1.控制台的長寬
修改 admin/settings.inc.php [ DiscuzX source/admincp/admincp_setting.php]
找到

程式碼:

$settingsnew['seccodedata']['width'] = $settingsnew['seccodedata']['width'] < 100 ? 100 : ($settingsnew['seccodedata']['width'] > 200 ? 200 : $settingsnew['seccodedata']['width']);
                        $settingsnew['seccodedata']['height'] = $settingsnew['seccodedata']['height'] < 50 ? 50 : ($settingsnew['seccodedata']['height'] > 80 ? 80 : $settingsnew['seccodedata']['height']);

把 200 跟 80 改成想要的值

2.實際圖片
修改 include/seccode.class.php [DiscuzX source/class/class_seccode.php]
找到

程式碼:

$this->width = $this->width >= 100 && $this->width <= 200 ? $this->width : 150;
                $this->height = $this->height >= 50 && $this->height <= 80 ? $this->height : 60;

把中間的 200 跟 80改成想要的值
注意:修改大小之後,原背景圖片會不夠長(如果有啟用這功能),可以考慮重做背景圖

3.[官方修改]隨機字數驗證碼
http://www.discuz.net/thread-1601061-1-1.html

4.QapTcha
http://www.myjqueryplugins.com/QapTcha
利用拖曳解除的驗證功能

5. reCaptcha [Google收購]
http://recaptcha.net/
國外常見的驗證碼,可免費申請使用
Discuz 官網搜尋 reCaptcha 有 DiscuzX 的改法

Discuz 6 說明
http://www.yookoala.idv.hk/en/node/24

HOWTO: Add reCAPTCHA support to Discuz! registration form
July 21, 2010

To prepare for this, you'll need:

Basic understanding to PHP programming language.
A reCAPTCHA API public-private key pair valid to your site. If you don't, please go to the below site to sign up for one: https://www.google.com/recaptcha/admin/create
Some understanding to your own site's template settings.

OK. Let's start.

First, you must download the latest reCaptcha PHP library from.
Please go to this site: Downloads - reCaptcha
(At the time I'm writing this guide, the version is recaptcha-php-1.11)

Decompress the zip file, and you'd have a folder looks like recaptcha-php-X.XX.

Use FTP to access your site files. In the folder that contains your Discuz! fourm, there is a folder called include. upload the folder recaptcha-php-X.XX to that folder.

Now. You must edit the file register.php of your forum. You may download it to your machine first, then upload it back after edit.

Open the file, find these line:

程式碼:

if($seccodecheck) {
                        $seccode = random(6, 1);
                }
                if($secqaa['status'][1]) {
                        $seccode = random(1, 1) * 1000000 + substr($seccode, -6);
                }
        
                include template('register');
        
        } else {

At the line before "include template('register');", plaste these code:

程式碼:

// recaptcha hack start
                require_once dirname(__FILE__) . "/include/recaptcha-php-X.XX/recaptchalib.php";
                $recaptcha_publickey = 'replace this with your real public key';
                $recaptcha_html = recaptcha_get_html($recaptcha_publickey);
                // recaptcha hack end

Remember to change the variable $recaptcha_publickey to your own reCAPTCHA public key.



One more change to this file.

Find these lines:

程式碼:

require_once DISCUZ_ROOT.'./include/discuzcode.func.php';
        
                $email = trim($email);
                $username = addslashes(trim(stripslashes($username)));
                $alipay = trim($alipay);
        
                if(strlen($username) < 3) {
                        showmessage('profile_username_tooshort');
                }
                if(strlen($username) > 15) {
                        showmessage('profile_username_toolong');
                }
        
                if($password != $password2) {
                        showmessage('profile_passwd_notmatch');
                }

Below the line "require_once ...", insert these code:

程式碼:

// recaptcha hack start
                require_once dirname(__FILE__) . "/include/recaptcha-php-X.XX/recaptchalib.php";
                $recaptcha_privatekey = 'replace this with your real private key';
                $resp = recaptcha_check_answer ($recaptcha_privatekey,
                          $_SERVER["REMOTE_ADDR"],
                          $_POST["recaptcha_challenge_field"],
                          $_POST["recaptcha_response_field"]);
                if (!$resp->is_valid) {
                  // What happens when the CAPTCHA was entered incorrectly
                  showmessage('reCAPTCHA failed. reCAPTCHA said: ' . trim($resp->error));
                }
                // recaptcha hack end

Again, remember to change the variable $recaptcha_privatekey to your own reCAPTCHA private key.

Save the file register.php and put it back.
Now the PHP part is done. We still need to change to template file so users can see the reCAPTCHA image. Please find the template file register.htm.

The actual location depends on your template settings. Note that if you let users to determine their own template setting, you'd probably need to change the register.htm.

If you sticked to the default settings, the folder-name of your template files should be default. In this case, the template file your need to change is templates/default/register.htm



Open register.htm. Find these line:

程式碼:

<th><label for="email">{lang email} *</label></td>
                                <td>
                                        <input type="text" name="email" size="25" id="email" onBlur="checkemail()" tabindex="6" />
                                        <span id="checkemail">{lang register_email_recommend}<!--{if $regverify == 1}-->&nbsp; {lang register_email_comment}<!--{/if}-->
                                        <!--{if $accessemail}-->&nbsp; {lang register_email_invalid}<!--{elseif $censoremail}-->&nbsp; {lang register_email_censor}<!--{/if}--></span>
                                </td>
                        </tr>
        
                        <!--{if $regstatus > 1}-->
                                <tr>
                                        <th><label for="invitecode">{lang invite_code}<!--{if $regstatus == 2}--> *<!--{/if}--></label></th>
                                        <td><input type="text" name="invitecode" size="25" maxlength="16" value="$invitecode" id="invitecode" onBlur="checkinvitecode()" tabindex="7" />
                                        <span id="checkinvitecode"></span>
                                </td>

And in between the <tr> and </tr>, insert these lines:

程式碼:

<!-- reCaptcha hack start -->
        <!--{if $recaptcha_html}-->
                        <tr>
                          <th><label for="recaptcha">reCaptcha *</label></th>
                          <td>$recaptcha_html</td>
                        </tr>
        <!--{/if}-->
        <!-- reCaptcha hack end -->

The result should looks like this:

程式碼:

<tr>
                                <th><label for="email">{lang email} *</label></td>
                                <td>
                                        <input type="text" name="email" size="25" id="email" onBlur="checkemail()" tabindex="6" />
                                        <span id="checkemail">{lang register_email_recommend}<!--{if $regverify == 1}-->&nbsp; {lang register_email_comment}<!--{/if}-->
                                        <!--{if $accessemail}-->&nbsp; {lang register_email_invalid}<!--{elseif $censoremail}-->&nbsp; {lang register_email_censor}<!--{/if}--></span>
                                </td>
                        </tr>
        
        
        <!-- reCaptcha hack start -->
        <!--{if $recaptcha_html}-->
                        <tr>
                          <th><label for="recaptcha">reCaptcha *</label></th>
                          <td>$recaptcha_html</td>
                        </tr>
        <!--{/if}-->
        <!-- reCaptcha hack end -->
        
                        <!--{if $regstatus > 1}-->
                                <tr>
                                        <th><label for="invitecode">{lang invite_code}<!--{if $regstatus == 2}--> *<!--{/if}--></label></th>
                                        <td><input type="text" name="invitecode" size="25" maxlength="16" value="$invitecode" id="invitecode" onBlur="checkinvitecode()" tabindex="7" />
                                        <span id="checkinvitecode"></span>
                                </td>

Save this file back to the server. Everything should be working just fine.

P.S. This has been tested on Discuz 6.0 and should be OK on other versions.