Cloudflare Workers code to integrate IBM Translator to Mastodon

worker.js

/**
 * Welcome to Cloudflare Workers! This is your first worker.
 *
 * - Run "npm run dev" in your terminal to start a development server
 * - Open a browser tab at http://localhost:8787/ to see your worker in action
 * - Run "npm run deploy" to publish your worker
 *
 * Learn more at https://developers.cloudflare.com/workers/
 */

// Namhyeon Go <[email protected], @[email protected]>
// 2023-10-27

const API_KEY = '';
const API_ENDPOINT_URL = '';

function get_languages() {
  let langcodes = ["ko", "ja", "en", "es", "de", "pt", "ru", "zh"];
  return [
    {"code": "en", "name": "English", "targets": langcodes},
    {"code": "ko", "name": "Korean", "targets": langcodes},
    {"code": "ja", "name": "Japanese", "targets": langcodes},
    {"code": "es", "name": "Spanish", "targets": langcodes},
    {"code": "de", "name": "German", "targets": langcodes},
    {"code": "pt", "name": "Portuguese", "targets": langcodes},
    {"code": "ru", "name": "Russian", "targets": langcodes},
    {"code": "zh", "name": "Chinese", "targets": langcodes}
  ];
}

function get_clean_text(s) {
  // https://stackoverflow.com/questions/5002111/how-to-strip-html-tags-from-string-in-javascript
  // https://stackoverflow.com/questions/10805125/how-to-remove-all-line-breaks-from-a-string
  // https://stackoverflow.com/questions/23571013/how-to-remove-url-from-a-string-completely-in-javascript
  return String(s)
    .replace(/<\/?[^>]+(>|$)/g, '')
    .replace(/(\r\n|\n|\r)/gm, '\n')
    .replace(/(?:https?|ftp):\/\/[\n\S]+/g, '')
    .replace(/#/gi, '')
    .trim();
  ;
}

async function get_translated_text(q, target, source = 'en') {
  // 언어 코드 확인
  let source_language = get_languages().reduce((a, x) => {
    if (x.code == source) a = [x.code, x.name];
    return a;
  }, ['en', 'English']);
  let target_language = get_languages().reduce((a, x) => {
    if (x.code == target) a = [x.code, x.name];
    return a;
  }, ['ko', 'Korean']);

  // 사용자 이름과 비밀번호
  const username = 'apikey';
  const password = API_KEY;

  // Base64로 사용자 이름과 비밀번호 인코딩
  const base64Credentials = btoa(`${username}:${password}`);

  // 요청 옵션
  const originalText = get_clean_text(q);
  const requestOptions = {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      'Authorization': `Basic ${base64Credentials}` // Basic 인증 헤더 추가
    },
    body: JSON.stringify({
      "text": [originalText],
      "model_id": `${source_language[0]}-${target_language[0]}`
    }) // JSON 데이터를 문자열로 변환하여 전송
  };
  console.log(originalText);

  // API 엔드포인트
  const apiUrl = API_ENDPOINT_URL + '/v3/translate?version=2018-05-01';

  // Fetch API를 사용하여 POST 요청 보내기
  const response = await fetch(apiUrl, requestOptions);
  const result = await response.json();
  console.log(JSON.stringify(result));

  // 번역 결과 반환
  return {
    "translatedText": result.translations.reduce((a, x) => {
      a.push(x.translation);
      return a;
    }, [])
  }
}

export default {
  async fetch(request, env, ctx) {
    const { pathname } = new URL(request.url);

    switch (pathname) {
      case "/languages":
        return Response.json(get_languages());

      case "/translate":
        if (request.method === "POST") {
          try {
            const { q, target, source } = JSON.parse(await request.text());
            return Response.json(await get_translated_text(q, target, source));
          } catch (e) {
            return new Response(e.message, {status: 500});
          }
        } else {
          return new Response("Not Allowed Method", {status: 405});
        }

      default:
        return new Response("Not Allowed Method", {status: 405});
    }
  }
};