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）。注意该项目需要添加以下几个引用：
System.Web
Newtonsoft.Json
MSScriptControl(com组件中的Microsoft Script Control 1.0)
一、WebRequest代码
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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TKK的值：
直接在获取的源代码中用正则匹配出这个值：Regex re = new Regex(@"(?<=TKK=')(.*?)(?=')")，可以得到一个字符串：428502.368022592
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：
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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：
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/// <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
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using System;using System.IO;using System.Net;using System.Text;using System.Text.RegularExpressions;using MSScriptControl;using System.Web;namespace GoogleTranslate{ public class Translate { /// <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 TKK = re.Match(BaseResultHtml).ToString();//在返回的HTML中正则匹配TKK的值 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 cookie, string referer) { 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 = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.77 Safari/537.36"; 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; } }} |