如何基于腾讯云快速开发免费的翻译工具

0. 一个免费的翻译接口
1. 我需要一个简单的翻译服务，它的使用频率很低
2. 同时这个服务最好在我只有翻译需求时才运行
3. 我是个穷B，我不想花钱

// 1. create Canonical request string
const HTTPRequestMethod = (options.method || 'POST').toUpperCase()
const CanonicalURI = '/'
const CanonicalQueryString = ''
const CanonicalHeaders = `content-type:application/json\nhost:${Host}\n`
const SignedHeaders = 'content-type;host'
const HashedRequestPayload = crypto
  .createHash('sha256')
  .update(JSON.stringify(payload))
  .digest('hex')
const CanonicalRequest = `${HTTPRequestMethod}\n${CanonicalURI}\n${CanonicalQueryString}\n${CanonicalHeaders}\n${SignedHeaders}\n${HashedRequestPayload}`

// 2. create string to sign
const CredentialScope = `${date}/${options.ServiceType}/tc3_request`
const HashedCanonicalRequest = crypto.createHash('sha256').update(CanonicalRequest).digest('hex')
const StringToSign = `${Algorithm}\n${Timestamp}\n${CredentialScope}\n${HashedCanonicalRequest}`

// 3. calculate signature
const SecretDate = sign(date, Buffer.from(`TC3${options.SecretKey}`, 'utf8'))
const SecretService = sign(options.ServiceType, SecretDate)
const SecretSigning = sign('tc3_request', SecretService)
const Signature = crypto
  .createHmac('sha256', SecretSigning)
  .update(Buffer.from(StringToSign, 'utf8'))
  .digest('hex')

// 4. create authorization
const Authorization = `${Algorithm} Credential=${options.SecretId}/${CredentialScope}, SignedHeaders=${SignedHeaders}, Signature=${Signature}`

const Dotenv = require('dotenv')
const { Capi } = require('tss-capi')
const path = require('path')

function scfReturn(err, data) {
  return {
    isBase64Encoded: false,
    statusCode: 200,
    headers: { 'Content-Type': 'application/json' },
    body: { error: err, data: data },
  }
}

exports.main_handler = async (event, context, callback) => {
  const query = event.queryString || {}
  const sourceText = query.q
  if (!sourceText) {
    return scfReturn(new Error('Please set word you want to translate.'), null)
  }
  try {
    const envPath = path.join(__dirname, '.env')
    const { parsed } = Dotenv.config({
      path: envPath,
    })

    const client = new Capi({
      Region: 'ap-guangzhou',
      SecretId: parsed.TENCENT_SECRET_ID,
      SecretKey: parsed.TENCENT_SECRET_KEY,
      ServiceType: 'tmt',
      host: 'tmt.tencentcloudapi.com',
    })

    const res = await client.request(
      {
        Action: 'TextTranslate',
        Version: '2018-03-21',
        SourceText: sourceText,
        Source: 'auto',
        Target: 'zh',
        ProjectId: 0,
      },
      {
        host: 'tmt.tencentcloudapi.com',
      }
    )

    const translateText = res.Response && res.Response.TargetText
    return scfReturn(null, translateText)
  } catch (e) {
    return scfReturn(e, null)
  }
}

Resources:
  default:
    Type: TencentCloud::Serverless::Namespace
    dict:
      Type: TencentCloud::Serverless::Function
      Properties:
        CodeUri: ./
        Description: Tencent Machine Translator
        Environment:
          Variables: {}
        Handler: index.main_handler
        Role: QCS_SCFExcuteRole
        MemorySize: 128
        Runtime: Nodejs8.9
        Timeout: 3
        VpcConfig:
          SubnetId: ''
          VpcId: ''
        Events:
          dict:
            Type: APIGW
            Properties:
              StageName: release
              ServiceId: service-7kqwzu92
              HttpMethod: ANY

{
  "isBase64Encoded": false,
  "statusCode": 200,
  "headers": {
    "Content-Type": "application/json"
  },
  "body": {
    "error": null,
    "data": "你好"
  }
}

$ dict billionaire
亿万富翁