Schoology portfolio getter and setter

example.js

const ps = new PortfolioStorer(); // creates new portfolio
ps.ready.then(id => {
  ps.setContent('Hello world!').then(() => {
    ps.getContent().then(console.log);
  });
});

PortfolioStorer.js

const PortfolioStorer = (() => {
  
  function fetchJSON(path, headers, method = 'GET', body = undefined) {
    return fetch('https://pausd.schoology.com/portfolios/' + path, {method, headers, body: body && JSON.stringify(body)})
      .then(r => r.json())
      .then(({data}) => data);
  }
  
  class PortfolioStorer {
    
    constructor(id, uid) {
      this.uid = uid || siteNavigationUiProps.props.user.uid;
      this.ready = this.getCSRFToken().then(() => {
        return (this.id = id) || this.createPortfolio()
          .then(ids => this.id = this.uid + '-' + ids.join('-'))
          .then(() => this.setupPortfolio());
      });
    }
    
    getCSRFToken() {
      return fetchJSON('init')
        .then(({csrfToken}) => this.csrfToken = csrfToken);
    }
    
    createPortfolio() {
      return fetchJSON(`users/${this.uid}/portfolios`, {'X-Csrf-Token': this.csrfToken}, 'POST')
        .then(({id: portfolioID}) => fetchJSON(`users/${this.uid}/portfolios/${portfolioID}/items`,
            {'X-Csrf-Token': this.csrfToken}, 'POST', {item_type: "page", metadata: {}})
          .then(({id: pageID, portfolio: {public_hash}}) => [portfolioID, pageID, public_hash]));
    }
    
    setupPortfolio() {
      const [uid, portfolioID, pageID, public_hash] = this.id.split('-');
      return Promise.all([
        fetchJSON(`users/${uid}/portfolios/${portfolioID}`, {'X-Csrf-Token': this.csrfToken}, 'PUT',
          {title: 'Communications', description: 'Your ID: ' + this.id}),
        fetchJSON(`users/${this.uid}/portfolios/${portfolioID}/items/${pageID}`,
          {'X-Csrf-Token': this.csrfToken}, 'PUT', {title: 'User data', description: 'Don\'t edit this page!'})
      ]);
    }
    
    setContent(content) {
      const [, portfolioID, pageID] = this.id.split('-');
      return fetchJSON(`users/${this.uid}/portfolios/${portfolioID}/items/${pageID}`, {'X-Csrf-Token': this.csrfToken}, 'PUT', {metadata: {content}});
    }
    
    getContent(id = this.id) {
      const [uid, portfolioID, pageID, public_hash] = id.split('-');
      return fetchJSON(`users/${uid}/portfolios/${portfolioID}/items/${pageID}`,
          {'X-Csrf-Token': this.csrfToken, 'X-Public-Hash': public_hash})
        .then(({metadata: {content}}) => content);
    }
    
    getID() {
      return this.id;
    }
    
  }
  
  return PortfolioStorer;
})();