C#实现百度智能云文档翻译

C#实现百度智能云文档翻译

https://login.bce.baidu.com/?redirect=https%3A%2F%2Fconsole.bce.baidu.com%2Ftools%2F%3F_%3D1672204525069#/api?product=AI&project=%E6%9C%BA%E5%99%A8%E7%BF%BB%E8%AF%91&parent=%E6%96%87%E6%A1%A3%E7%BF%BB%E8%AF%91&api=rpc%2F2.0%2Fmt%2Fv2%2Fdoc-translation%2Fquery&method=post

namespace BaiduTranslateLibrary
{
    public static class TranslateFunction
    {
        public static void TestTranslate()
        {
            TranslateConfig translateConfig = new TranslateConfig() { 
                appId = "xxxxx",
                passWord = "xxxx"
            };
            string filepath = @"C:\Users\cn49ak\Downloads\xxxx.pdf";
            var verificationservice = translateConfig.TranslateVerificationService(filepath, "en", "zh");
            var translateservice = translateConfig.Translate(verificationservice.fileId, filepath, "en", "zh");
        }
        /// <summary>
        /// 校验服务
        /// </summary>
        /// <returns></returns>
        public static PostVerificationResult TranslateVerificationService(this TranslateConfig translateConfig,string filepath, string languageFrom, string languageTo)
        {
            string appId = translateConfig.appId,
                passWord = translateConfig.passWord, 
                randomNum = translateConfig.GetRandomNumber;
            long timestamp = (DateTime.Now.ToUniversalTime().Ticks - 621355968000000000) / 10000000;
            string safeFileName = Path.GetFileName(filepath);
            // NPOIFileContext.FileRead(filepath);
            string extension = Path.GetExtension(filepath).Substring(1).ToLower();
            string UrlRequest = "https://fanyi-api.baidu.com/api/trans/vip/doctrans?";
            string ortherparams = "appid=" + appId + "&from=" + languageFrom  + "&to=" + languageTo + "&timestamp=" + timestamp + "&type=" + extension +"&";
            //+ "&sign=" + md5Sign;
            string md5Sign = MD5EX.GetMD5HashFromFile(filepath).ToLower();
            // 拼接
            string md5Sign2 = MD5EX.EncryptString(ortherparams + md5Sign + passWord).ToLower();
            string FullRequest = UrlRequest + ortherparams + "sign=" + md5Sign2;
            string m_postResult = PostFile(FullRequest, filepath);
            PostVerificationResult m_postResultds = new JavaScriptSerializer().Deserialize<PostVerificationResult>(m_postResult);
            return m_postResultds;
        }
        public static string PostFile(string url, string fileName)
        {
            //验证文件是否存在
            if (File.Exists(fileName) == false)
                throw new Exception("发送文件不存在！");
            FileInfo file = new FileInfo(fileName);
            string boundary = "qianle";//分隔符
            HttpWebRequest req = WebRequest.Create(url) as HttpWebRequest;
            //构造请求体
            byte[] itemBoundaryBytes = Encoding.UTF8.GetBytes("\r\n--" + boundary + "\r\n");
            byte[] byteEnd = Encoding.UTF8.GetBytes("\r\n--" + boundary + "--\r\n"); //结束标识 --xxxx--
            StringBuilder strContent = new StringBuilder();
            strContent
                .Append("Content-Disposition:form-data;name=\"file\";filename=\"" + file.Name + "\"")
                .AppendLine()
                .Append("Content-Type:application/octet-stream")
                .AppendLine()
                .AppendLine(); //特别说明，Content-Disposition 前边不能添加换行符号
            byte[] byteContent = Encoding.UTF8.GetBytes(strContent.ToString());
            byte[] byteFile = File.ReadAllBytes(fileName);
            //执行发送
            req.Method = "POST";
            req.ContentType = $"multipart/form-data;charset=utf-8;boundary={boundary}";
            //req.UserAgent =  UserAgent;
            req.ContinueTimeout = 20000;
            var reqStrem = req.GetRequestStream();
            reqStrem.Write(itemBoundaryBytes, 0, itemBoundaryBytes.Length); //文件开始
            reqStrem.Write(byteContent, 0, byteContent.Length);//文件信息
            reqStrem.Write(byteFile, 0, byteFile.Length);//文件内容
            reqStrem.Write(byteEnd, 0, byteEnd.Length); //文件结束
            reqStrem.Close();
            WebResponse resp = req.GetResponse();
            StreamReader sr = new StreamReader(resp.GetResponseStream());
            string result = sr.ReadToEnd();
            sr.Close();
            resp.Close();
            return result;
        }
        public static PostResult Translate(this TranslateConfig translateConfig, string field,string filepath, string languageFrom, string languageTo,string outPutType = "docx")
        {
            string appId = translateConfig.appId,
                passWord = translateConfig.passWord,
                randomNum = translateConfig.GetRandomNumber;
            long timestamp = (DateTime.Now.ToUniversalTime().Ticks - 621355968000000000) / 10000000;
            string extension = Path.GetExtension(filepath).Substring(1).ToLower();
            string md5Sign = MD5EX.EncryptString(appId + randomNum + passWord).ToLower();
            string FullRequest = "https://fanyi-api.baidu.com/api/trans/vip/doctrans?type=" + extension + "&outPutType=" + outPutType + "&fileId=" + field + "&timestamp=" + timestamp + "&from=" + languageFrom + "&to=" + languageTo + "&appid=" + appId + "&sign=" + md5Sign;
            string m_Content = new WebClient().DownloadString(FullRequest);
            PostResult m_postResult = new JavaScriptSerializer().Deserialize<PostResult>(m_Content);
            return m_postResult;
        }
        public class TranslateConfig
        {
            public TranslateConfig()
            {
                randomNum = new Random().Next().ToString();
            }
            public string appId { get; set; }
            public string passWord { get; set; }
            private string randomNum { get; set; }
            public string GetRandomNumber => randomNum;
        }
        public class PostVerificationResult
        {
            public string Error_code { set; get; }
            public string Error_msg { set; get; }
            public string From { set; get; }
            public string To { set; get; }
            public object data { get; set; }
            public int charCount { get; set; }
            public string fileId { get; set; }
            /// <summary>
            /// 预算：单位分
            /// </summary>
            public int amount { set; get; }
        }
        public class PostResult
        {
            public string Error_code { set; get; }
            public string Error_msg { set; get; }
            public string From { set; get; }
            public string To { set; get; }
            public TranslateContent[] Trans_result { set; get; }
        }
        public class TranslateContent
        {
            public string Src { set; get; }
            public string Dst { set; get; }
        }
    }
}