Скрипт авторизации в московском метро, `completion` callback возврата ios commands

metro-ios.js

(async function() {
  await new Promise((res) => {
    if (document.readyState === 'complete') {
      res();
    } else {
      const handler = () => {
        res();
        window.removeEventListener('load', handler);
      };

      window.addEventListener('load', handler);
    }
  });

  const sendToken = (token) => {
    const url = new URL(location.href);
    const segment = url.searchParams.get('segment') || 'metro';

    document.cookie = 'afVideoPassed=0';

    return fetch(`${url.origin}/auth/init?mode=0&segment=${segment}`, {
      method: 'POST',
      headers: {
        'X-CSRF-Token': token,
      },
    });
  };

  class TokenExtractor {
    extract() {}
  }

  class MetaTokenExtractor extends TokenExtractor {
    extract() {
      const metaCSRF = document.querySelector('meta[name=csrf-token]');

      return metaCSRF && metaCSRF.getAttribute('content');
    }
  }

  class LinkTokenExtractor extends TokenExtractor {
    extract() {
      const links = [...document.querySelectorAll('a')];

      return links.reduce((acc, link) => {
        if (acc) return acc;

        const match = link.href.match(/token=([^&\s]+)&?/);

        if (match) {
          return match[1];
        }
      }, null);
    }
  }

  const extractors = [new MetaTokenExtractor(), new LinkTokenExtractor()];

  const token = extractors
    .reduce((acc, extractor) => acc || extractor.extract(), null);

  if (!token) throw new Error('Токен не найден');

  await sendToken(token);
})()
  .then(completion)
  .catch(completion);

metro.js

(async function() {
  await new Promise((res) => {
    if (document.readyState === 'complete') {
      res();
    } else {
      const handler = () => {
        res();
        window.removeEventListener('load', handler);
      };

      window.addEventListener('load', handler);
    }
  });

  const sendToken = (token) => {
    const url = new URL(location.href);
    const segment = url.searchParams.get('segment') || 'metro';

    document.cookie = 'afVideoPassed=0';

    return fetch(`${url.origin}/auth/init?mode=0&segment=${segment}`, {
      method: 'POST',
      headers: {
        'X-CSRF-Token': token,
      },
    });
  };

  class TokenExtractor {
    extract() {}
  }

  class MetaTokenExtractor extends TokenExtractor {
    extract() {
      const metaCSRF = document.querySelector('meta[name=csrf-token]');

      return metaCSRF && metaCSRF.getAttribute('content');
    }
  }

  class LinkTokenExtractor extends TokenExtractor {
    extract() {
      const links = [...document.querySelectorAll('a')];

      return links.reduce((acc, link) => {
        if (acc) return acc;

        const match = link.href.match(/token=([^&\s]+)&?/);

        if (match) {
          return match[1];
        }
      }, null);
    }
  }

  const extractors = [new MetaTokenExtractor(), new LinkTokenExtractor()];

  const token = extractors
    .reduce((acc, extractor) => acc || extractor.extract(), null);

  if (!token) throw new Error('Токен не найден');

  await sendToken(token);
})();