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C#实现谷歌翻译API示例代码

来源:本站原创|时间:2020-01-10|栏目:C#教程|点击:

由于谷歌翻译官方API是付费版本,本着免费和开源的精神,分享一下用C#实现谷歌翻译API的代码。这个代码非常简单,主要分两块:通过WebRequest的方式请求内容;获取Get方式的请求参数(难点在于tk的获取)。

一、WebRequest代码

var webRequest = WebRequest.Create(url) as HttpWebRequest;
webRequest.Method = "GET";

webRequest.CookieContainer = cookie; 

webRequest.Referer = referer;

webRequest.Timeout = 20000;
webRequest.Headers.Add("X-Requested-With:XMLHttpRequest");
webRequest.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8";

webRequest.UserAgent = useragent;

 using (var webResponse = (HttpWebResponse)webRequest.GetResponse())

 {

   using (var reader = new StreamReader(webResponse.GetResponseStream(), Encoding.UTF8))

   {
    html = reader.ReadToEnd();

    reader.Close();

    webResponse.Close();

   }

 } 

二、谷歌翻译接口的实现

1、抓包查看翻译网络请求,这里是用谷歌浏览器查看的网络请求,如下图:

可以看到,请求方式是“Get”方式,后面跟的请求参数很多,如下图:

其中,最重要的参数有:sl--来源语言,一般设置为auto即自动检测,tl--目标语言,你想翻译成的语言,tk--ticket即使发车车票,谷歌就靠这个来防止我们免费调用的,这是本API最难的地方。

2、tk的获取

在打开https://translate.google.com/页面是,获取到的HTML代码中有如下一个生成TKK的脚本:

直接运行这个脚本,可以生成一个字符串:

从监控的网络中可以发现其中一个JS调用了这个TKK值,这个JS加了密进行混淆的,要破解这个JS需要扎实的基本功,以及足够的耐心,我也是网上找的别人破解的JS代码,亲测可用,需将此代码保存在gettk.js文档中,方便调用:

var b = function (a, b) {

  for (var d = 0; d < b.length - 2; d += 3) {

    var c = b.charAt(d + 2),

      c = "a" <= c ? c.charCodeAt(0) - 87 : Number(c),

      c = "+" == b.charAt(d + 1) ? a >>> c : a << c;

    a = "+" == b.charAt(d) ? a + c & 4294967295 : a ^ c

  }

  return a

}

 

var tk = function (a,TKK) {

  for (var e = TKK.split("."), h = Number(e[0]) || 0, g = [], d = 0, f = 0; f < a.length; f++) {

    var c = a.charCodeAt(f);

    128 > c ? g[d++] = c : (2048 > c ? g[d++] = c >> 6 | 192 : (55296 == (c & 64512) && f + 1 < a.length && 56320 == (a.charCodeAt(f + 1) & 64512) ? (c = 65536 + ((c & 1023) << 10) + (a.charCodeAt(++f) & 1023), g[d++] = c >> 18 | 240, g[d++] = c >> 12 & 63 | 128) : g[d++] = c >> 12 | 224, g[d++] = c >> 6 & 63 | 128), g[d++] = c & 63 | 128)

  }

  a = h;

  for (d = 0; d < g.length; d++) a += g[d], a = b(a, "+-a^+6");

  a = b(a, "+-3^+b+-f");

  a ^= Number(e[1]) || 0;

  0 > a && (a = (a & 2147483647) + 2147483648);

  a %= 1E6;

  return a.toString() + "." + (a ^ h)

} 

要得到tk只需要,运行tk这个函数,它有两个输入值:a为翻译文本内容,TKK是上文正则匹配得到的JS字符串执行的结果值。为方便在C#中执行JS,封装了一个能执行JS的函数,如下:

/// <summary>

/// 执行JS

/// </summary>

/// <param name="sExpression">参数体</param>

/// <param name="sCode">JavaScript代码的字符串</param>

/// <returns></returns>

private string ExecuteScript(string sExpression, string sCode)

{

  MSScriptControl.ScriptControl scriptControl = new MSScriptControl.ScriptControl();

  scriptControl.UseSafeSubset = true;

  scriptControl.Language = "JScript";

  scriptControl.AddCode(sCode);

  try

  {

    string str = scriptControl.Eval(sExpression).ToString();

    return str;

  }

  catch (Exception ex)

  {

    string str = ex.Message;

  }

  return null;

}    

3、实现翻译的完整代码

/// <summary>

/// 谷歌翻译

/// </summary>

/// <param name="text">待翻译文本</param>

/// <param name="fromLanguage">自动检测:auto</param>

/// <param name="toLanguage">中文:zh-CN,英文:en</param>

/// <returns>翻译后文本</returns>

public string GoogleTranslate(string text, string fromLanguage, string toLanguage)

{

  CookieContainer cc = new CookieContainer();

 

  string GoogleTransBaseUrl = "https://translate.google.com/";

 

  var BaseResultHtml = GetResultHtml(GoogleTransBaseUrl, cc, "");

 

  Regex re = new Regex(@"(?<=TKK=)(.*?)(?=\);)");

 

  var TKKStr = re.Match(BaseResultHtml).ToString() + ")";//在返回的HTML中正则匹配TKK的JS代码

 

  var TKK = ExecuteScript(TKKStr, TKKStr);//执行TKK代码,得到TKK值

 

  var GetTkkJS = File.ReadAllText("./gettk.js");

 

  var tk = ExecuteScript("tk(\""+text+"\",\""+TKK+"\")", GetTkkJS);

 

  string googleTransUrl = "https://translate.google.com/translate_a/single?client=t&sl="+fromLanguage+"&tl="+toLanguage+"&hl=en&dt=at&dt=bd&dt=ex&dt=ld&dt=md&dt=qca&dt=rw&dt=rm&dt=ss&dt=t&ie=UTF-8&oe=UTF-8&otf=1&ssel=0&tsel=0&kc=1&tk="+tk+"&q="+HttpUtility.UrlEncode(text);

 

  var ResultHtml = GetResultHtml(googleTransUrl, cc, "https://translate.google.com/");

 

  dynamic TempResult = Newtonsoft.Json.JsonConvert.DeserializeObject(ResultHtml);

 

  string ResultText = Convert.ToString(TempResult[0][0][0]);

 

  return ResultText;

}

 

public string GetResultHtml(string url,CookieContainer cc,string refer)

{

  var html="";

   

  var webRequest = WebRequest.Create(url) as HttpWebRequest;

 

  webRequest.Method = "GET";

 

  webRequest.CookieContainer = cookie;

 

  webRequest.Referer = referer;

 

  webRequest.Timeout = 20000;

 

  webRequest.Headers.Add("X-Requested-With:XMLHttpRequest");

 

  webRequest.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8";

 

  webRequest.UserAgent = useragent;

 

  using (var webResponse = (HttpWebResponse)webRequest.GetResponse())

  {

     using (var reader = new StreamReader(webResponse.GetResponseStream(), Encoding.UTF8))

     {

 

      html = reader.ReadToEnd();

      reader.Close();

      webResponse.Close();

     }

  }

  return html;

}

 

/// <summary>

/// 执行JS

/// </summary>

/// <param name="sExpression">参数体</param>

/// <param name="sCode">JavaScript代码的字符串</param>

/// <returns></returns>

private string ExecuteScript(string sExpression, string sCode)

{

  MSScriptControl.ScriptControl scriptControl = new MSScriptControl.ScriptControl();

  scriptControl.UseSafeSubset = true;

  scriptControl.Language = "JScript";

  scriptControl.AddCode(sCode);

  try

  {

    string str = scriptControl.Eval(sExpression).ToString();

    return str;

  }

  catch (Exception ex)

  {

    string str = ex.Message;

  }

  return null;

}  

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