Asp.Net Core 实现谷歌翻译ApI 免费版

　　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 Net Core 实现谷歌翻译API的代码。

项目引用的Nuget 包：

ChakraCore.NET

Newtonsoft.Json

JavaScriptEngineSwitcher.ChakraCore.Native.win-x86(特别说明一下"win-x86",代表程序运行环境。)

翻译地址：https://translate.google.cn(国内可以访问)

参数说明：

text：待翻译文本

sl：需要翻译的语言(中文：zh-CN，英文：en)

tl： 翻译结果的语言(中文：zh-CN，英文：en)

 public class HttpHelper
     {
         /// <summary>
         /// 请求
         /// </summary>
         /// <param name="url">地址</param>
         /// <param name="args">参数</param>
         /// <returns></returns>
         public static string GetRequest(string url, CookieContainer cookieContainer, Dictionary<string, dynamic> args)
         {
             try
             {
                 if (args.Count > )
                 {
                     var argStr = string.Empty;

                     foreach (var item in args)
                     {
                         if (item.Key == null || item.Value == null)
                         {
                             continue;
                         }
                         argStr = $"{argStr}{item.Key}={item.Value}&";
                     }

                     url = $"{url}?{argStr.TrimEnd('&')}";
                 }

                 HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
                 request.Method = "get";
                 request.Timeout = ;
                 request.CookieContainer = cookieContainer;
                 request.UserAgent = GetUserAgent();
                 request.Headers.Add("X-Requested-With:XMLHttpRequest");
                 request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8";
                 using (var webResponse = (HttpWebResponse)request.GetResponse())
                 {
                     using (var reader = new StreamReader(webResponse.GetResponseStream(), Encoding.UTF8))
                     {

                         return reader.ReadToEnd();
                     }
                 }
             }
             catch (Exception)
             {
                 return string.Empty;
             }
         }

         /// <summary>
         /// 用户代理
         /// </summary>
         /// <returns></returns>
         private static string GetUserAgent()
         {
             var userAgents = new List<string>
             {
                 "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/22.0.1207.1 Safari/537.1",
                 "Mozilla/5.0 (X11; CrOS i686 2268.111.0) AppleWebKit/536.11 (KHTML, like Gecko) Chrome/20.0.1132.57 Safari/536.11",
                 "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/536.6 (KHTML, like Gecko) Chrome/20.0.1092.0 Safari/536.6",
                 "Mozilla/5.0 (Windows NT 6.2) AppleWebKit/536.6 (KHTML, like Gecko) Chrome/20.0.1090.0 Safari/536.6",
                 "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/19.77.34.5 Safari/537.1",
                 "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/536.5 (KHTML, like Gecko) Chrome/19.0.1084.9 Safari/536.5",
                 "Mozilla/5.0 (Windows NT 6.0) AppleWebKit/536.5 (KHTML, like Gecko) Chrome/19.0.1084.36 Safari/536.5",
                 "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/536.3 (KHTML, like Gecko) Chrome/19.0.1063.0 Safari/536.3",
                 "Mozilla/5.0 (Windows NT 5.1) AppleWebKit/536.3 (KHTML, like Gecko) Chrome/19.0.1063.0 Safari/536.3",
                 "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_0) AppleWebKit/536.3 (KHTML, like Gecko) Chrome/19.0.1063.0 Safari/536.3",
                 "Mozilla/5.0 (Windows NT 6.2) AppleWebKit/536.3 (KHTML, like Gecko) Chrome/19.0.1062.0 Safari/536.3",
                 "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/536.3 (KHTML, like Gecko) Chrome/19.0.1062.0 Safari/536.3",
                 "Mozilla/5.0 (Windows NT 6.2) AppleWebKit/536.3 (KHTML, like Gecko) Chrome/19.0.1061.1 Safari/536.3",
                 "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/536.3 (KHTML, like Gecko) Chrome/19.0.1061.1 Safari/536.3",
                 "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/536.3 (KHTML, like Gecko) Chrome/19.0.1061.1 Safari/536.3",
                 "Mozilla/5.0 (Windows NT 6.2) AppleWebKit/536.3 (KHTML, like Gecko) Chrome/19.0.1061.0 Safari/536.3",
                 "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/535.24 (KHTML, like Gecko) Chrome/19.0.1055.1 Safari/535.24",
                 "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/535.24 (KHTML, like Gecko) Chrome/19.0.1055.1 Safari/535.24",
                 "Mozilla/5.0 (Macintosh; U; Mac OS X Mach-O; en-US; rv:2.0a) Gecko/20040614 Firefox/3.0.0 ",
                 "Mozilla/5.0 (Macintosh; U; PPC Mac OS X 10.5; en-US; rv:1.9.0.3) Gecko/2008092414 Firefox/3.0.3",
                 "Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.1) Gecko/20090624 Firefox/3.5",
                 "Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2.14) Gecko/20110218 AlexaToolbar/alxf-2.0 Firefox/3.6.14",
                 "Mozilla/5.0 (Macintosh; U; PPC Mac OS X 10.5; en-US; rv:1.9.2.15) Gecko/20110303 Firefox/3.6.15",
                 "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:2.0.1) Gecko/20100101 Firefox/4.0.1",
                 "Opera/9.80 (Windows NT 6.1; U; en) Presto/2.8.131 Version/11.11",
                 "Opera/9.80 (Android 2.3.4; Linux; Opera mobi/adr-1107051709; U; zh-cn) Presto/2.8.149 Version/11.10",
                 "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) AppleWebKit/531.21.8 (KHTML, like Gecko) Version/4.0.4 Safari/531.21.10",
                 "Mozilla/5.0 (Windows; U; Windows NT 5.2; en-US) AppleWebKit/533.17.8 (KHTML, like Gecko) Version/5.0.1 Safari/533.17.8",
                 "Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/533.19.4 (KHTML, like Gecko) Version/5.0.2 Safari/533.18.5",
                 "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0",
                 "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0)",
                 "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0)",
                 "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)"
             };

             return userAgents.OrderBy(x => Guid.NewGuid()).First();
         }
     }

HttpHelper

 /// <summary>
     /// 翻译 助手
     /// </summary>
     public static class TranslationHelper
     {
         /// <summary>
         /// Chakra 上下文
         /// </summary>
         private static readonly ChakraContext _chakraContext;

         /// <summary>
         /// Cookie
         /// </summary>
         private static readonly CookieContainer _cookieContainer;

         /// <summary>
         /// 请求地址
         /// </summary>
         private static readonly string _baseUrl;

         /// <summary>
         /// 静态
         /// </summary>
         static TranslationHelper()
         {
             var runtime = ChakraRuntime.Create();

             _baseUrl = "http://translate.google.cn/translate_a/single";
             _cookieContainer = new CookieContainer();
             _chakraContext = runtime.CreateContext(true);

             var basePath = PlatformServices.Default.Application.ApplicationBasePath;
             var jsFileText = File.ReadAllText($@"{basePath}\gettk.js");

             _chakraContext.RunScript(jsFileText); //运行脚本
         }

         /// <summary>
         /// 获取翻译结果(需要翻译的文字默认使用中文)
         /// </summary>
         /// <param name="toLang">语言</param>
         /// <param name="originalText">待翻译的文本</param>
         /// <returns></returns>
         public static string GetTranslation(this string toLang, string originalText)
         {
             if (string.IsNullOrEmpty(toLang))
             {
                 return toLang;
             }
             if (string.IsNullOrEmpty(originalText))
             {
                 return originalText;
             }

             return GetTranslation("zh-cn", toLang, originalText);

         }

         /// <summary>
         /// 获取翻译结果
         /// </summary>
         /// <param name="fromLang">需要翻译的语言</param>
         /// <param name="toLang">翻译结果的语言</param>
         /// <param name="originalText">待翻译文本</param>
         /// <returns></returns>
         public static string GetTranslation(this string fromLang, string toLang, string originalText)
         {
             var args = new Dictionary<string, dynamic>
             {
                 { "client", "t" },
                 { "sl", fromLang },
                 { "tl", toLang },
                 { "dt", "t" },
                 { "tk", GetTK(originalText) },
                 { "text", HttpUtility.UrlEncode(originalText) }
             };

             var result = HttpHelper.GetRequest(_baseUrl, _cookieContainer, args);

             return result.FormattedJson();
         }

         /// <summary>
         /// 获取TK
         /// </summary>
         /// <param name="originalText"></param>
         /// <returns></returns>
         private static string GetTK(string originalText)
         {
             _chakraContext.GlobalObject.WriteProperty("originalText", originalText);
             return _chakraContext.RunScript("getTK(originalText)");
         }

         /// <summary>
         /// 格式化Json
         /// </summary>
         /// <param name="jsonStr">Json</param>
         /// <returns></returns>
         private static string FormattedJson(this string jsonStr)
         {
             if (string.IsNullOrEmpty(jsonStr))
             {
                 return string.Empty;
             }

             var array = JsonConvert.DeserializeObject<JArray>(jsonStr);

             var result = array[][][].ToString();

             return result;
         }

     }

TranslationHelper

参考：C#实现谷歌翻译API