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C#实现谷歌翻译API示例代码

2019-10-29 21:09:55
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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:

C#实现谷歌翻译API,C#,谷歌翻译

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:

C#实现谷歌翻译API,C#,谷歌翻译

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

C#实现谷歌翻译API,C#,谷歌翻译

直接运行这个脚本,可以生成一个字符串:

C#实现谷歌翻译API,C#,谷歌翻译

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;}  

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持VEVB武林网。

 

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