ReCaptcha Asp Net

recaptcha-asp-net

Google recaptcha用于ASP网络，简化

安装

Nuget URL：https：//www.nuget.org/packages/recaptcha-aspnet

 PM > Install-Package ReCaptcha-AspNet

配置

在https://www.google.com/recaptcha/admin上获取您的秘密和公共密钥

添加到您的应用程序/web.config内部

< add key = " recaptcha-secret-key " value = " ...[secret key] " />
< add key = " recaptcha-public-key " value = " ...[public-key] " />

Optional if you want to alter the default language of the Captcha (Get the language code on ReCaptcha site: https://developers.google.com/recaptcha/docs/language) Or you can use value "Auto" and it will get the Language from System.Thread.CurrentCulture

< add key = " recaptcha-language-key " value = " [language-code] " />

或通过C＃代码：只需要一次调用一次，一个放置它的好地方是在application_start（）函数

 string publicKey = "...[public-key]" ;
string secretKey = "...[secret-key]" ;
ReCaptcha . Configure ( publicKey , secretKey ) ;

// Optional, select a default language:
ReCaptchaLanguage defaultLanguage = ReCaptchaLanguage . German ;
ReCaptcha . Configure ( publicKey , secretKey , defaultLanguage ) ;

//Auto-select language from System.Thread.CurrentCulture
ReCaptchaLanguage defaultLanguage = ReCaptchaLanguage . Auto ;
ReCaptcha . Configure ( publicKey , secretKey , defaultLanguage ) ;

如果您想将默认主题从光模式更改为黑暗模式，请进行可选。

< add key = " recaptcha-language-theme " value = " dark " />

或通过C＃代码：

 //Optional select a default dark theme
ReCaptchaLanguage defaultLanguage = ReCaptchaLanguage . Auto ;
ReCaptcha . Configure ( publicKey , secretKey , defaultLanguage , ReCaptchaTheme . dark ) ; 

如何使用

客户端（v2）：

在您的表格内

 < form action =" myAction " >
  < input type =" text " name =" myinput1 " />
  @ReCaptcha.GetCaptcha() <!-- Will show your captcha as your configured Language, 
  if no language is defined it will show ReCaptcha default language (English) -->
</ form >

如果要覆盖已配置的默认语言，请进行可选：

 < form action =" myAction " >
  < input type =" text " name =" myinput1 " />
  @ReCaptcha.GetCaptcha(ReCaptchaLanguage.PortugueseBrazil) <!-- Will show your ReCaptcha as Portuguese, 
  overriding any previous configuration -->
</ form >

如果您想覆盖已配置的主题（浅色/黑暗），请进行可选：

 < form action =" myAction " >
  < input type =" text " name =" myinput1 " />
  @ReCaptcha.GetCaptcha(theme: ReCaptchaTheme.dark) <!-- Will show your ReCaptcha on dark theme, 
  overriding any previous configuration -->
</ form >

客户端（无形）：

在您的表格内

 < script type =" text/javascript " > function submit ( ) { $ ( 'form' ) . submit ( ) ; } </ script >
< form action =" myAction " >
  < input type =" text " name =" myinput1 " />
  @ReCaptcha.GetInvisibleCaptcha("submit", "Save") <!-- Will show a button, with a Label Save and  call function "submit();" after user click ok and pass Captcha -->
</ form >

如果要覆盖已配置的默认语言，请进行可选：

 < script type =" text/javascript " > function submit ( ) { $ ( 'form' ) . submit ( ) ; } </ script >
< form action =" myAction " >
  < input type =" text " name =" myinput1 " />
  @ReCaptcha.GetInvisibleCaptcha("submit", "Save", ReCaptchaLanguage.PortugueseBrazil) <!-- Will show your Invisible ReCaptcha as Portuguese, overriding any previous configuration -->
</ form >

服务器端：

在您的控制器功能或过滤器中

 string userResponse = HttpContext . Request . Params [ "g-recaptcha-response" ] ;
bool validCaptcha = ReCaptcha . ValidateCaptcha ( userResponse ) ;
if ( validCaptcha ) {
  // Real User, validated !
  DoStuff ( ) ;
  .. .
} else {
  // Bot Attack, non validated !
  return RedirectToAction ( "YouAreARobot" , "Index" ) ;
} 

可选：代理

您可以使用代理将用户响应发送到recaptcha服务器

.. .
const string proxyIp = "xxx.xxx.xxx.xxx" ;
const int proxyPort = 1234 ;
WebProxy webProxy = new WebProxy ( proxyIp , proxyPort ) ; 
bool validCaptcha = ReCaptcha . ValidateCaptcha ( userResponse , webProxy ) ;
.. .

如果秘密密钥无效，则可能会引发以下异常，或者您将无效的用户响应作为vasteratecaptcha参数：

 throw new ReCaptchaException ( ) ;

它也可以称为异步：

 public async ActionResult MyFunction ( ) {
  string userResponse = HttpContext . Request . Params [ "g-recaptcha-response" ] ;
  var validCaptcha = ReCaptcha . ValidateCaptchaAsync ( userResponse ) ;
  DoSomeParallelStuff ( ) ;
  
  if ( await validCaptcha ) {
    // Real User, validated !
    DoStuff ( ) ;
    .. .
  } else {
    // Bot Attack, non validated !
    return RedirectToAction ( "YouAreARobot" , "Index" ) ;
  }
}