字节跳动 火山引擎 机器翻译调用 C#版 参考 https://github.com/volcengine/volc-sdk-java
region
- cn-north-1 (默认)
- ap-singapore-1
- us-east-1
官方的文档给出了Python，Go的示例 https://www.volcengine.com/docs/4640/65067 同时在github开源了java版的sdk https://github.com/volcengine/volc-sdk-java
官方文档并没有对细节做过多说明，全部都封装在SDK中，因此需要从头做起
经过整理，得出以下的流程：（放大看）
-
首先注册并开通火山引擎账号，得到APIKey和APISecret
-
先将要翻译的内容和语言方向结合成json
{
"SourceLanguage":"en"
,"TargetLanguage":"zh",
"TextList":["Hello World"]
}
顺便将这个json SHA256处理 RequestJsonHash
c10bf741ac14393bec67f6a6f44163915ae6982c4e1bd5ebbf377ca2f5d29ea0
- 获取一个系统时间，UTC格式 分别处理为日期和时间，再结合成日期T时间Z 格式 （典型的Trados风格）
dateTimeSign = DateTime.UtcNow
dateSign = ToString("yyyyMMdd")
//20210618
timeSign =ToString("hhmmss")
//092822
//Merge
dateSign + "T" + timeSign + "Z"
//20210618T092822Z
- 准备request Header
-- URI
HTTP://open.volcengineapi.com/?Action=TranslateText&Version=2020-06-01-- ContentType = "application/json" -- Accept = "application/json" --HOST = "open.volcengineapi.com" --UserAgent = "volc-sdk-java/v1.0.16" --X-Date = 上一步的组合日期时间 //20210618T092822Z --X-Content-Sha256 = 上一步json的RequestJsonHash --最后Authorization用下面的方法做 - Authorization 使用hmac-sha256 生成，因此需要一个string和一个byte[] 做key --string string来自于字符串的拼接组合，content-type;host;x-content-sha256;x-date 加上RequestJsonHash等等进行一系列复杂组合
POST
/
Action=TranslateText&Version=2020-06-01
content-type:application/json
host:open.volcengineapi.com
x-content-sha256:c10bf741ac14393bec67f6a6f44163915ae6982c4e1bd5ebbf377ca2f5d29ea0
x-date:20210618T092822Z
content-type;host;x-content-sha256;x-date
c10bf741ac14393bec67f6a6f44163915ae6982c4e1bd5ebbf377ca2f5d29ea0
之后进行sha256
e63964174aa1b21ec105371eb64e7a88b708ff02f751226581166fe1ebf9c34d
再和时间日期等进一步组合
stringToSign
HMAC-SHA256
20210618T092822Z
20210618/cn-north-1/translate/request
e63964174aa1b21ec105371eb64e7a88b708ff02f751226581166fe1ebf9c34d
--key
- 首先日期运算
kDate = hmacsha256(NowDate, APISecret) - 日期运算的结果进入下一步
kRegion = hmacsha256("cn-north-1", kDate) - 运算的结果进入再下一步
kService = hmacsha256("translate", kRegion ) - 运算的结果进入再下一步
signingKey = hmacsha256("request", kService )
最后signingKey 和stringToSign 进行hmacsha256
Signature=682ab697257b1e17089f8100119b4c26c3bb71b7257c303b32cb39beba596bec
组合为Header
HMAC-SHA256 Credential=xxxxxxxxxxxxx/20210618/cn-north-1/translate/request, SignedHeaders=content-type;host;x-content-sha256;x-date, Signature=682ab697257b1e17089f8100119b4c26c3bb71b7257c303b32cb39beba596bec
加入request后和json一起发送给HTTP://open.volcengineapi.com/?Action=TranslateText&Version=2020-06-01 得到 repond
{"TranslationList":[{"Translation":"世界你好","DetectedSourceLanguage":"","Extra":null}],"ResponseMetadata":{"RequestId":"02162401024121600000000000000000000ffff0ac264104e27ea","Action":"TranslateText","Version":"2020-06-01","Service":"translate","Region":"cn-north-1"}}
//不应该是*你好世界*吗？