调用说明

StringToSign =
    HTTP-Verb + "\n" +      //HTTP-Verb只支持POST
    Accept + “\n” +         //Accept为application/json
    Content-MD5 + "\n" +    //第1步中计算出来的MD5值
    Content-Type + "\n" +   //Content-Type值为application/json
    Date + "\n" +           //Date值为GMT时间
    x-langboat-signature-method + "\n" +  // 只支持 HMAC-SHA256
    x-langboat-signature-nonce + "\n";

POST
application/json
3lZ5H2U03PtJN91b22mubw==
application/json
Mon, 10 Oct 2022 07:11:08 GMT
HMAC-SHA256
42889

action=translateDoc&domain=general&sourceLanguage=zh&targetLanguage=en

stringToSign = headerStringToSign + queryToSign;

Signature = Base64(HMAC-SHA256( AccessSecret, UTF-8-Encoding-Of(stringToSign)))
Authorization = AccessKey + ":" + Signature

{
  "code": 0,
  "message": "success",
  "data": { "docID": "448a2625-846a-4891-a48f-a43ed7117942" },
  "requestId": "402cd89f6e5fecc600c496af2ee63d4a"
}

{
  "code": 10422,
  "message": "参数错误，核对请求参数[ 不支持的domain : biology ]",
  "requestId": "962132b206f8cedc77e41030b9aac2e6"
}

# request:
curl --request POST 'https://open.langboat-test.cc?action=translateDoc&domain=general&sourceLanguage=zh&memoryID=38&targetLanguage=en' \
--header 'Content-MD5: cQvTn30Hx7G2S4E/SQgjBw==' \
--header 'x-langboat-signature-method: HMAC-SHA256' \
--header 'x-langboat-signature-nonce: 92508' \
--header 'Authorization: tUGFmn3k3ty14o4d9iRBHq4INE******:f7s+9kLfIJWPB/uMSCySxDcjQLwdx7VJ92VqRsN/r+Y=' \
--header 'Date: Wed, 30 Nov 2022 02:51:03 GMT' \
--header 'Content-Type: application/json' \
--data-raw '{
        "fileContent": "5L2g5aW977yM5LiW55WM",
        "filename": "test.txt",
        "fileType": "txt"
}'

# response:
{"code":0,"message":"success","requestId":"402cd89f6e5fecc600c496af2ee63d4a","data":{"docID":"448a2625-846a-4891-a48f-a43ed7117942"}}

{
  "code": 0,
  "message": "success",
  "requestId": "f82e17bdfda8dc8f98e42fc20eae3867",
  "data": {
    "domain": "general",
    "sourceLanguage": "zh",
    "targetLanguage": "en",
    "filename": "test.txt",
    "fileType": "txt",
    "fileSize": 12,
    "fileMD5": "",
    "fileContent": "5L2g5aW977yM5LiW55WM"
  }
}

# request:
curl --request GET 'https://open.langboat-test.cc?action=translateDocDownload&docID=448a2625-846a-4891-a48f-a43ed7117942' \
--header 'Content-MD5: 1B2M2Y8AsgTpgAmY7PhCfg==' \
--header 'x-langboat-signature-method: HMAC-SHA256' \
--header 'x-langboat-signature-nonce: 92508' \
--header 'Authorization: tUGFmn3k3ty14o4d9iRBHq4INE******:nhvdAy9711TuDHQ4kteFuarlscbtHHXclfb9LSW0Ao0=' \
--header 'Date: Wed, 30 Nov 2022 02:58:57 GMT' \
--header 'Content-Type: application/json'

# response
{
  "code": 0,
  "message": "success",
  "requestId": "f82e17bdfda8dc8f98e42fc20eae3867",
  "data": {
    "domain": "general",
    "sourceLanguage": "zh",
    "targetLanguage": "en",
    "filename": "test.txt",
    "fileType": "txt",
    "fileSize": 12,
    "fileMD5": "",
    "fileContent": "5L2g5aW977yM5LiW55WM"
  }
}

api-example
├── pom.xml
├── src
│   ├── main
│   │   └── java
│   │       └── com.langboat.saas.example
│   │           ├── Examples.java
│   │           └── LangboatOpenClient.java

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.langboat.saas.example</groupId>
    <artifactId>api-example</artifactId>
    <version>1.0.0</version>
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>11</source>
                    <target>11</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
    <packaging>jar</packaging>

    <name>api-example</name>

    <properties>
        <java.version>11</java.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <dependencies>
        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.8.10</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.14.0</version>
        </dependency>
    </dependencies>
</project>

package com.langboat.saas.example;

import cn.hutool.core.util.URLUtil;
import com.fasterxml.jackson.databind.ObjectMapper;

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.security.MessageDigest;
import java.text.SimpleDateFormat;
import java.util.*;

public class LangboatOpenClient {

    private final String accessKey;

    private final String accessSecret;

    private final String url;

    public LangboatOpenClient(String accessKey, String accessSecret) {
        this.accessKey = accessKey;
        this.accessSecret = accessSecret;
        this.url =  "https://open.langboat.com";
    }

    public LangboatOpenClient(String accessKey, String accessSecret, String url) {
        this.accessKey = accessKey;
        this.accessSecret = accessSecret;
        this.url = url;
    }

    /*
     * 计算 MD5 + Base64
     */
    private String MD5Base64(String s) {
        if (s == null)
            return null;
        String encodeStr = "";
        byte[] utfBytes = s.getBytes();
        MessageDigest mdTemp;
        try {
            mdTemp = MessageDigest.getInstance("MD5");
            mdTemp.update(utfBytes);
            byte[] md5Bytes = mdTemp.digest();
            encodeStr = Base64.getEncoder().encodeToString(md5Bytes);
        } catch (Exception e) {
            throw new Error("Failed to generate MD5 : " + e.getMessage());
        }
        return encodeStr;
    }

    /*
     * 计算 HMAC-SHA256 + Base64 编码
     */
    private String HMACSha256Base64(String data, String key) {
        String result;
        try {
            SecretKeySpec signingKey = new SecretKeySpec(key.getBytes(), "HmacSHA256");
            Mac mac = Mac.getInstance("HmacSHA256");
            mac.init(signingKey);
            byte[] rawHmac = mac.doFinal(data.getBytes());
            result = Base64.getEncoder().encodeToString(rawHmac);
        } catch (Exception e) {
            throw new Error("Failed to generate HMAC : " + e.getMessage());
        }
        return result;
    }

    /*
     * 获取时间
     */
    private String toGMTString(Date date) {
        SimpleDateFormat df = new SimpleDateFormat("E, dd MMM yyyy HH:mm:ss z", Locale.CHINA);
        df.setTimeZone(new java.util.SimpleTimeZone(0, "GMT"));
        return df.format(date);
    }

    /**
     * 调用服务
     * @param queries: query 参数
     * @param data: request body 数据
     * @return
     */
    public Object inference(Map<String, String> queries,Map<String, Object> data) {
        PrintWriter out = null;
        BufferedReader in = null;
        StringBuilder result = new StringBuilder();
        try {
            StringBuilder queriesStr = new StringBuilder();
            queries.forEach((k, v) -> queriesStr.append("&").append(k).append("=").append(URLUtil.encode(v)));
            queriesStr.setCharAt(0, '?');
            URL openUrl = new URL(this.url +queriesStr);

            String body = new ObjectMapper().writeValueAsString(data);
            String method = "POST";
            String accept = "application/json";
            String contentType = "application/json";
            String date = toGMTString(new Date());
            // 1.对body做MD5+BASE64加密
            String bodyMd5 = MD5Base64(body);
            String nonce = "" + (int) (Math.random() * 65535);
            String headerToSign = method + "\n" + accept + "\n" + bodyMd5 + "\n"
                    + contentType + "\n" + date + "\n"
                    + "HMAC-SHA256\n"
                    + nonce + "\n";
            // 2.计算 queryToSign
            List<String> queriesList = new ArrayList<>();
            queries.forEach((k, v) -> queriesList.add(k + "=" + v));
            Collections.sort(queriesList);
            String queryToSign = String.join("&", queriesList);
            // 3.计算 stringToSign
            String stringToSign = headerToSign + queryToSign;
            // 4.计算 HMAC-SHA256 + Base64
            String signature = HMACSha256Base64(stringToSign, this.accessSecret);
            // 5.得到 authorization header 值
            String authorization = this.accessKey + ":" + signature;

            URLConnection conn = openUrl.openConnection();
            conn.setRequestProperty("Accept", accept);
            conn.setRequestProperty("Content-Type", contentType);
            conn.setRequestProperty("Content-MD5", bodyMd5);
            conn.setRequestProperty("Date", date);
            conn.setRequestProperty("Authorization", authorization);
            conn.setRequestProperty("x-langboat-signature-nonce", nonce);
            conn.setRequestProperty("x-langboat-signature-method", "HMAC-SHA256");
            // POST
            conn.setDoOutput(true);
            conn.setDoInput(true);

            out = new PrintWriter(conn.getOutputStream());
            // 发送请求参数
            out.print(body);
            // flush输出流的缓冲
            out.flush();
            // 定义BufferedReader输入流来读取URL的响应
            InputStream is;
            HttpURLConnection httpConn = (HttpURLConnection) conn;
            if (httpConn.getResponseCode() == 200) {
                is = httpConn.getInputStream();
            } else {
                is = httpConn.getErrorStream();
            }
            in = new BufferedReader(new InputStreamReader(is));
            String line;
            while ((line = in.readLine()) != null) {
                result.append(line);
            }

        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (out != null) {
                    out.close();
                }
                if (in != null) {
                    in.close();
                }
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
        return result.toString();
    }
}

package com.langboat.saas.example;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.io.FileUtil;
import cn.hutool.json.JSONUtil;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.IOException;
import java.util.Base64;
import java.util.Map;

/**
 * API 调用示例
 */
public class Examples {

    private final LangboatOpenClient client  = new LangboatOpenClient("yourAccessKey", "yourAccessSecret");

    /***
     * 提交待翻译文档
     * @param path 待翻译文档路径
     * @throws IOException 文件异常
     */
    public Object submitFileToTranslate(String path) throws IOException {
        BufferedInputStream in = FileUtil.getInputStream(path);
        String fileContent = Base64.getEncoder().encodeToString(in.readAllBytes());
        Map<String, String> queries = Map.of(
                "action", "translateDoc",
                "domain", "general",
                "sourceLanguage", "zh",
                "targetLanguage", "en"
        );
        Map<String, Object> body = Map.of(
                "fileContent", fileContent,
                "filename", "test.txt",
                "fileType", "txt"
        );
        return this.client.inference(queries, body);
    }

    /***
     * 下载翻译后的文档, 解析base64编码的 fileContent 写入文件即可得到翻译后的文件
     * @param docID 提交待翻译文档后得到的文档ID
     * @param path 翻译后的文件保存的位置
     */
    public void downloadTranslatedFile(String docID, String path) throws IOException {
        Map<String, String> queries = Map.of(
                "action", "translateDocDownload",
                "docID", docID
        );
        String o2 = (String) this.client.inference(queries, null);
        Map<String, Object> resp = JSONUtil.parseObj(o2);
        Map<String, Object> data = BeanUtil.beanToMap(resp.get("data"));
        String content = (String) data.get("fileContent");
        String filename = (String) data.get("filename");
        BufferedOutputStream out = FileUtil.getOutputStream(path + filename);
        out.write(Base64.getDecoder().decode(content));
        out.flush();
    }

    public static void main(String[] args) throws IOException {
        Examples examples = new Examples();
        
        Object res = examples.submitFileToTranslate("~/test.txt");
        System.out.println(res);

        examples.downloadTranslatedFile("628ad432-dac5-453c-92c6-31cd497852cb", "~/");
    }
}

# -*- coding: utf-8 -*-
import base64
import datetime
import hashlib
import hmac
import json
import random
import requests


class LangboatOpenClient:
    """澜舟开放平台客户端"""

    def __init__(self,
                 access_key: str,
                 access_secret: str,
                 url: str = "https://open.langboat.com"):
        self.access_key = access_key
        self.access_secret = access_secret
        self.url = url

    def _build_header(self, query: dict, data: dict) -> dict:
        accept = "application/json"
        # 1. body MD5 加密
        content_md5 = base64.b64encode(
            hashlib.md5(
                json.dumps(data).encode("utf-8")
            ).digest()
        ).decode()
        content_type = "application/json"
        gmt_format = '%a, %d %b %Y %H:%M:%S GMT'
        date = datetime.datetime.utcnow().strftime(gmt_format)
        signature_method = "HMAC-SHA256"
        signature_nonce = str(random.randint(0, 65535))
        header_string = f"POST\n{accept}\n{content_md5}\n{content_type}\n" \
                        f"{date}\n{signature_method}\n{signature_nonce}\n"

        # 2. 计算 queryToSign
        queries_str = []
        for k, v in sorted(query.items(), key=lambda item: item[0]):
            if isinstance(v, list):
                for i in v:
                    queries_str.append(f"{k}={i}")
            else:
                queries_str.append(f"{k}={v}")
        queries_string = '&'.join(queries_str)
        # 3.计算 stringToSign
        sign_string = header_string + queries_string
        # 4.计算 HMAC-SHA256 + Base64
        secret_bytes = self.access_secret.encode("utf-8")
        # 5.计算签名
        signature = base64.b64encode(
            hmac.new(secret_bytes, sign_string.encode("utf-8"), hashlib.sha256).digest()
        ).decode()
        res = {
            "Content-Type": content_type,
            "Content-MD5": content_md5,
            "Date": date,
            "Accept": accept,
            "X-Langboat-Signature-Method": signature_method,
            "X-Langboat-Signature-Nonce": signature_nonce,
            "Authorization": f"{self.access_key}:{signature}"
        }
        return res

    def inference(self, queries: dict, data: dict) -> (int, dict):
        """
        服务调用
        :param queries: query 参数
        :param data: request body 数据
        :return: response status, response body to json
        """
        headers = self._build_header(queries, data)
        response = requests.post(url=self.url, headers=headers, params=queries, json=data)
        return response.status_code, response.json()


if __name__ == '__main__':
    _access_key = '<Your access_key>'
    _access_secret = '<Your access_secret>'
    client = LangboatOpenClient(
        access_key=_access_key,
        access_secret=_access_secret
    )

    # 读取待翻译文档 text.txt（内容："你好，世界"）
    with open("test.txt", "rb") as f:
        content = base64.standard_b64encode(f.read())
    # 获取文件的 base64 编码字符串
    file_content = str(content, "utf-8")
    # 提交待翻译文档
    _queries = {
        "action": "translateDoc",
        "domain": "general",
        "sourceLanguage": "zh",
        "targetLanguage": "en"
    }
    _data = {
        "fileContent": file_content,
        "filename": "test.txt",
        "fileType": "txt"
    }
    status_code, result = client.inference(_queries, _data)
    print("response status:", status_code)
    print("response json:", json.dumps(result, ensure_ascii=False, indent=2))

    # 下载翻译完成的文档
    status_code, result = client.inference({
        "action": "translateDocDownload",
        "docID": "54f60c11-6254-467a-8098-d806a1ad12ba", # 上面提交待翻译文档后返回的 docID
    }, {})

    print("response status:", status_code)
    print("response json:", json.dumps(result, ensure_ascii=False, indent=2))
    # 查看翻译后的文档内容
    print(base64.b64decode(result['data']['fileContent']))
    # 保存至文件 result.txt
    with open("result.txt", 'wb') as f:
        f.write(base64.b64decode(result['data']['fileContent']))

package main

import (
	"crypto/hmac"
	"crypto/md5"
	"crypto/sha256"
	"encoding/base64"
	"encoding/json"
	"fmt"
	"io/ioutil"
	"log"
	"math/rand"
	"net/http"
	"net/url"
	"sort"
	"strings"
	"time"
)

func main() {
	client := OpenClient{
		baseURL:      "https://open.langboat.com",
		accessKey:    "Your_Access_Key",
		accessSecret: "Your_Access_Secret",
	}
  // 提交待翻译文档
	queries := map[string]string{
		"action":         "translateDoc",
		"domain":         "general",
		"sourceLanguage": "zh",
		"targetLanguage": "en",
	}
  // 读取文档获取 base64 编码字符串
  filename := "./test.docx"
	content, _ := ioutil.ReadFile(filename)
	encodedMessage := base64.StdEncoding.EncodeToString(content)
	data := map[string]interface{}{
		"fileContent": encodedMessage,
		"filename":    "test.docx",
		"fileType":    "docx",
	}
	resp := client.Inference(queries, data)
	response, ok := resp.(*http.Response)
	if !ok {
		log.Fatal("fail to convert response")
	}
	body, err := ioutil.ReadAll(response.Body)
	if err != nil {
		log.Fatal("fail to read response body")
	}
	log.Println(string(body))

	// 下载翻译后的文档
	queries = map[string]string{
		"action": "translateDocDownload",
		"docID":  "54f60c11-6254-467a-8098-d806a1ad12ba",
	}

	resp = client.Inference(queries, nil)
	response, ok = resp.(*http.Response)
	if !ok {
		log.Fatal("fail to convert response")
	}
	body, err = ioutil.ReadAll(response.Body)
	if err != nil {
		log.Fatal("fail to read response body")
	}
	// 读取正文内容
	type RetData struct {
		SourceLanguage string `json:"source_language"` // 原始语言
		TargetLanguage string `json:"target_language"` // 目标语言
		Filename       string `json:"file_name"`       // 文档标题
		FileType       string `json:"file_type"`       // 文档类型
		FileSize       int32  `json:"file_size"`       // 文档大小
		FileMD5        string `json:"file_md5"`        // 文档MD5
		FileContent    string `json:"file_content"`    // 文档的Base64编码
	}
	type DownloadResp struct {
		Code      int32   `json:"code"`
		Message   string  `json:"message"`
		RequestID string  `json:"requestId"`
		Data      RetData `json:"data"`
	}
	var ret DownloadResp
	_ = json.Unmarshal(body, &ret)

	fileContent, _ := base64.StdEncoding.DecodeString(ret.Data.FileContent)
  // 翻译结果写入文件
	_ = ioutil.WriteFile("./"+ret.Data.Filename, fileContent, 0777)
}

type OpenClient struct {
	baseURL      string
	accessKey    string
	accessSecret string
}

// Inference 调用服务。queries: query 参数;data: request body 数据
func (c *OpenClient) Inference(queries map[string]string, data map[string]interface{}) interface{} {
	var queriesStr = ""
	var first = true
	for k, v := range queries {
		if first {
			queriesStr += "?" + k + "=" + url.QueryEscape(v)
			first = false
		} else {
			queriesStr += "&" + k + "=" + url.QueryEscape(v)
		}
	}

	dataJson, err := json.Marshal(data)
	if err != nil {
		log.Fatal(err.Error())
	}

	targetURL := c.baseURL + queriesStr
	client := &http.Client{
		Timeout: 15 * time.Second,
	}

	// 构造header
	var (
		payload = strings.NewReader(string(dataJson))
		date    = time.Now().UTC().Format(http.TimeFormat)
		nonce   = fmt.Sprint(10000 + rand.Intn(89999))
	)
	//  签名
	signParam := SignParam{
		Body:    string(dataJson),
		Query:   queriesStr[1:],
		DateGMT: date,
		Nonce:   nonce,
	}
	contentMD5, signature := GenSignature(signParam, c.accessSecret)
	// 设置header
	headers := map[string]string{
		"Authorization":               c.accessKey + ":" + signature,
		"Content-Type":                "application/json",
		"Accept":                      "application/json",
		"Date":                        date,
		"Content-MD5":                 contentMD5,
		"x-langboat-signature-method": "HMAC-SHA256",
		"x-langboat-signature-nonce":  nonce,
	}

	req, _ := http.NewRequest("POST", targetURL, payload)
	for k, v := range headers {
		req.Header.Add(k, v)
	}
	resp, err := client.Do(req)
	if err != nil {
		log.Println(err.Error())
	}

	return resp
}

// SignParam 生成签名需要的参数
type SignParam struct {
	Body    string // body数据
	Query   string // 原始query
	DateGMT string // GTM时间
	Nonce   string // 随机数
}

func getMD5(str string) []byte {
	h := md5.New()
	h.Write([]byte(str))
	return h.Sum(nil)
}

func hmacSha256(data string, secret string) []byte {
	h := hmac.New(sha256.New, []byte(secret))
	h.Write([]byte(data))
	return h.Sum(nil)
}

func resortQuery(src string) string {
	queries, _ := url.ParseQuery(src)
	keys := make([]string, 0)
	for k := range queries {
		keys = append(keys, k)
	}
	sort.Strings(keys)
	newQuery := url.Values{}
	for _, k := range keys {
		for _, value := range queries[k] {
			newQuery.Add(k, value)
		}
	}
	return newQuery.Encode()
}

// GenSignature 生成签名
func GenSignature(src SignParam, apiSecret string) (string, string) {
	// 计算body的md5值
	md5str := getMD5(src.Body)
	// base64后得到contentMD5
	contentMD5 := base64.StdEncoding.EncodeToString(md5str)
	// query解析，并按照字典序重新排列
	query := resortQuery(src.Query)
	query, _ = url.QueryUnescape(query)
	// 需要做签名的字符串结构
	stringToSign := `POST
application/json
%s
application/json
%s
HMAC-SHA256
%s
%s`
	stringToSign = fmt.Sprintf(stringToSign, contentMD5, src.DateGMT, src.Nonce, query)
	hmac256 := hmacSha256(stringToSign, apiSecret)
	signature := base64.StdEncoding.EncodeToString(hmac256)
	return contentMD5, signature
}