index.js

const LINKS = [
  { "name": "cloudflare", "url": "https://www.cloudflare.com/" },
  { "name": "github", "url": "https://www.github.com" },
  { "name": "cloudflare wrangler", "url": "https://github.com/cloudflare/wrangler" },
];

const STATIC_LINK = 'https://static-links-page.signalnerve.workers.dev';
const avatar_src = "https://media-exp1.licdn.com/dms/image/C4E03AQFVThL5gSdlJA/profile-displayphoto-shrink_400_400/0?e=1609372800&v=beta&t=PV4etq9lHXANz2dtNLReKCwOTx0QG6wLKCkpBpvHXlM";
const SVG_linkedin = '<svg role="img" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><title>LinkedIn icon</title><path d="M20.447 20.452h-3.554v-5.569c0-1.328-.027-3.037-1.852-3.037-1.853 0-2.136 1.445-2.136 2.939v5.667H9.351V9h3.414v1.561h.046c.477-.9 1.637-1.85 3.37-1.85 3.601 0 4.267 2.37 4.267 5.455v6.286zM5.337 7.433c-1.144 0-2.063-.926-2.063-2.065 0-1.138.92-2.063 2.063-2.063 1.14 0 2.064.925 2.064 2.063 0 1.139-.925 2.065-2.064 2.065zm1.782 13.019H3.555V9h3.564v11.452zM22.225 0H1.771C.792 0 0 .774 0 1.729v20.542C0 23.227.792 24 1.771 24h20.451C23.2 24 24 23.227 24 22.271V1.729C24 .774 23.2 0 22.222 0h.003z"/></svg>';
const SVG_github = '<svg role="img" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><title>GitHub icon</title><path d="M12 .297c-6.63 0-12 5.373-12 12 0 5.303 3.438 9.8 8.205 11.385.6.113.82-.258.82-.577 0-.285-.01-1.04-.015-2.04-3.338.724-4.042-1.61-4.042-1.61C4.422 18.07 3.633 17.7 3.633 17.7c-1.087-.744.084-.729.084-.729 1.205.084 1.838 1.236 1.838 1.236 1.07 1.835 2.809 1.305 3.495.998.108-.776.417-1.305.76-1.605-2.665-.3-5.466-1.332-5.466-5.93 0-1.31.465-2.38 1.235-3.22-.135-.303-.54-1.523.105-3.176 0 0 1.005-.322 3.3 1.23.96-.267 1.98-.399 3-.405 1.02.006 2.04.138 3 .405 2.28-1.552 3.285-1.23 3.285-1.23.645 1.653.24 2.873.12 3.176.765.84 1.23 1.91 1.23 3.22 0 4.61-2.805 5.625-5.475 5.92.42.36.81 1.096.81 2.22 0 1.606-.015 2.896-.015 3.286 0 .315.21.69.825.57C20.565 22.092 24 17.592 24 12.297c0-6.627-5.373-12-12-12"/></svg>';

addEventListener('fetch', event => {
  event.respondWith(handleRequest(event.request))
});
/**
 * @param {Request} request
 */
async function handleRequest(request) {
  const link = new URL(request.url);
  try {
    if (link.pathname === '/links') {
      return new Response(JSON.stringify(LINKS), { 
        headers: { "Content-Type": "application/json;charset=UTF-8" }
      });
    }  
    else {
      const jsonLink = new URL('/links', link);
      return getStatic(jsonLink.href);
    }
  } catch(err) {
    console.log("error: ", err.message)
    return new Response("ERROR", { status: 500 });
  }
};

async function getStatic() {
  const res = await fetch(STATIC_LINK, {
    headers: { "content-type": "text/html" }
    });

  return new HTMLRewriter()
    .on("div#links", new LinksHandler())
    .on("div#profile", new AttrRemover("style"))
    .on("img#avatar", new AttrRewriter("src", avatar_src))
    .on("h1#name", new ContentEdditor("add", "Linlu Liu"))
    .on("div#social", new AttrRemover("style"))
    .on("div#social", new ContentEdditor("add", `<a href="https://www.linkedin.com/in/linlu-liu-707b5b186/">${SVG_linkedin}</a>`))
    .on("div#social", new ContentEdditor("add", `<a href="https://github.com/lil131">${SVG_github}</a>`))
    .on("title", new ContentEdditor("set", "Linlu Liu"))
    .on("body", new AttrRewriter("style", "background-color : #73C3D5"))
    .transform(res);
}

class LinksHandler {  
  //add in a new a for each link in your API using HTMLRewriter.
  element(element) {
    try {
      let myLinks = LINKS;
      myLinks.forEach(link => {
        element.append(`<a href=${link.url}>${link.name}</a>`, { html: Boolean });
      });
    } catch (error) {
      console.log(error.message)
    }
  }
}

class AttrRemover {
  constructor(attributeName) {
    this.attributeName = attributeName;
  }

  element(element) {
    element.removeAttribute('style');
  }
}

class AttrRewriter {
  constructor(attributeName, value) {
    this.attributeName = attributeName;
    this.value = value;
  };

  element(element) {
    element.setAttribute(this.attributeName, this.value);
  };
}

class ContentEdditor {
  constructor(action, content) {
    this.action = action;
    this.content = content;
  }

  element(element) {
    if (this.action === 'add') {
      element.append(this.content, { html: Boolean });
    } 
    if (this.action === 'set') {
      element.setInnerContent(this.content);
    }
  }
}