如何使用Python插件reCaptcha客户端进行验证？

Question

我想做一个验证码验证。

我从 验证码网站 并且已经成功地输入公钥来加载带有挑战的网页。

<script type="text/javascript"
   src="http://api.recaptcha.net/challenge?k=<your_public_key>">
</script>

<noscript>
   <iframe src="http://api.recaptcha.net/noscript?k=<your_public_key>"
       height="300" width="500" frameborder="0"></iframe><br>
   <textarea name="recaptcha_challenge_field" rows="3" cols="40">
   </textarea>
   <input type="hidden" name="recaptcha_response_field" 
       value="manual_challenge">
</noscript>

我下载 reCaptcha Python 插件 但我找不到任何有关如何使用它的文档。

有谁知道如何使用这个Python插件吗？recaptcha-client-1.0.4.tar.gz (md5)

Answer 1

这很简单。 这是我正在使用的一个简单的trac插件的例子：

from recaptcha.client import captcha

if req.method == 'POST':
    response = captcha.submit(
        req.args['recaptcha_challenge_field'],
        req.args['recaptcha_response_field'],
        self.private_key,
        req.remote_addr,
        )
    if not response.is_valid:
        say_captcha_is_invalid()
    else:
        do_something_useful()
else:
    data['recaptcha_javascript'] = captcha.displayhtml(self.public_key)
    data['recaptcha_theme'] = self.theme
    return 'recaptchaticket.html', data, n

Answer 2

很抱歉，这个模块虽然工作得很好，但几乎完全没有文档记录，而且对于我们这些喜欢在安装后使用“>> help(modulename)”的人来说，它的布局有点令人困惑。我将给出一个使用cherrypy的例子，然后做一些与cgi相关的评论。

captcha.py 包含两个函数和一个类：

• 显示_html：返回熟悉的“reCaptcha 框”

• 提交：它在后台提交用户输入的值

• 回顾回复：这是一个包含 reCaptcha 响应的容器类

您首先需要导入 capcha.py 的完整路径，然后创建几个处理显示和处理响应的函数。

from recaptcha.client import captcha
class Main(object):

    @cherrypy.expose
    def display_recaptcha(self, *args, **kwargs):
        public = "public_key_string_you_got_from_recaptcha"
        captcha_html = captcha.displayhtml(
                           public,
                           use_ssl=False,
                           error="Something broke!")

        # You'll probably want to add error message handling here if you 
        # have been redirected from a failed attempt
        return """
        <form action="validate">
        %s
        <input type=submit value="Submit Captcha Text" \>
        </form>
        """%captcha_html

    # send the recaptcha fields for validation
    @cherrypy.expose
    def validate(self, *args, **kwargs):
        # these should be here, in the real world, you'd display a nice error
        # then redirect the user to something useful

        if not "recaptcha_challenge_field" in kwargs:
            return "no recaptcha_challenge_field"

        if not "recaptcha_response_field" in kwargs:
            return "no recaptcha_response_field"

        recaptcha_challenge_field  = kwargs["recaptcha_challenge_field"]
        recaptcha_response_field  = kwargs["recaptcha_response_field"]

        # response is just the RecaptchaResponse container class. You'll need 
        # to check is_valid and error_code
        response = captcha.submit(
            recaptcha_challenge_field,
            recaptcha_response_field,
            "private_key_string_you_got_from_recaptcha",
            cherrypy.request.headers["Remote-Addr"],)

        if response.is_valid:
            #redirect to where ever we want to go on success
            raise cherrypy.HTTPRedirect("success_page")

        if response.error_code:
            # this tacks on the error to the redirect, so you can let the
            # user knowwhy their submission failed (not handled above,
            # but you are smart :-) )
            raise cherrypy.HTTPRedirect(
                "display_recaptcha?error=%s"%response.error_code)

如果使用cgi，情况几乎是一样的，只需使用REMOTE_ADDR环境变量（我使用cherrypy的request.headers）并使用字段存储来进行检查。

没有什么魔法，该模块只是遵循文档：https://developers.google.com/recaptcha/docs/display

您可能需要处理的验证错误：https://developers.google.com/recaptcha/docs/verify