Kindle Cloud Reader scraper

kindle-reader.js

// modified based on:
// - https://lowrey.me/scraping-a-book-from-kindle-read-amazon-com/
console.clear();

(function() {
  var hashes = {};
  var all = "";

  function hashString(str) {
    let hash = 0;
    for (let i = 0; i < str.length; i++) {
      hash += Math.pow(str.charCodeAt(i) * 31, str.length - i);
      hash = hash & hash; // Convert to 32bit integer
    }
    return hash;
  }

  function getKindleBookAppFrame() {
    return document.querySelector("#KindleReaderIFrame").contentDocument;
  }

  function turnPage() {
    return new Promise(resolve => {
      var appFrame = getKindleBookAppFrame();
      appFrame.getElementById("kindleReader_pageTurnAreaRight").click();
      setTimeout(resolve, 200);
    });
  }

  function isHeading(block) {
    if (
      $(block).is("h1") ||
      $(block).is("h2") ||
      $(block).is("h3") ||
      $(block).is("h4")
    ) {
      return true;
    }
    $(block)
      .contents()
      .each(() => {
        if (
          $(this).is("h1") ||
          $(this).is("h2") ||
          $(this).is("h3") ||
          $(this).is("h4")
        ) {
          return true;
        }
      });
    return false;
  }

  function getContentFramesSubElements(contentFrames) {
    return Array.from(
      contentFrames[currentContentFrameIndex].querySelectorAll(
        "\
       body > div, body > h1, body > h2, body > h3, body > h4, body > h5, body > h6, \
       body > ol, body > ul, body > li \
    "
      )
    );
  }

  function scrapeFrames() {
    return new Promise(resolve => {
      frames = [];
      var appFrame = getKindleBookAppFrame();
      var contentFrames = Array.from(appFrame.querySelectorAll("iframe")).map(
        f => f.contentDocument
      );

      var frameBody = $("iframe")
        .contents()
        .find("iframe")
        .contents()
        .find("body")
        .get(1);
      //     console.log(frameBody);
      let hash = hashString(frameBody.innerText);
      if (hashes[hash] === undefined) {
        hashes[hash] = true;
        frames.push(frameBody.innerHTML);
      }
      resolve(frames);
    });
  }

  function formatFrames(frames) {
    console.log("unformatted");
    console.log(frames);
    return new Promise(resolve => {
      formattedFrames = [];

      for (let i = 0; i < frames.length; i++) {
        const frame = frames[i];

        let formattedFrame = {
          is_heading: false,
          is_list_item: false,
          text: null
        };

        // check if frame contains a unordered/ordered list
        if ($(frame).is("ul")) {
          // break up list further
          let ulTexts = Array.from($(frame).contents())
            .map(el => {
              return $(el).text();
            })
            .filter(el => {
              return el.trim().length != 0;
            });
          ulTexts.forEach(text => {
            formattedFrame["text"] = text;
            formattedFrame["is_list_item"] = true;
            formattedFrames.push(formattedFrame);
          });
        } else if ($(frame).is("ol")) {
          let olTexts = Array.from($(frame).contents())
            .map(el => {
              return $(el).text();
            })
            .filter(el => {
              return el.trim().length != 0;
            });
          olTexts.forEach(text => {
            formattedFrame["text"] = text;
            formattedFrame["is_list_item"] = true;
            formattedFrames.push(formattedFrame);
          });
          console.log(formattedFrames);
        } else {
          // otherwise, treat as paragraph
          const text = $(frame).text();
          if (text.trim().length == 0) {
            continue;
          }
          formattedFrame["is_heading"] = isHeading(frame);
          formattedFrame["text"] = $(frame).text();
          formattedFrames.push(formattedFrame);
        }
      }

      resolve(formattedFrames);
    });
  }

  function getFormattedFrames() {
    // return a promise with an array of formatted scraped content
    return scrapeFrames().then(formatFrames);
  }

  function hasReachedEndSample() {
    var appFrame = getKindleBookAppFrame();
    var endSampleMessageDiv = appFrame.getElementById(
      "kindle_sample_end_message"
    );
    return $(endSampleMessageDiv).is(":visible");
  }

  function hasReachedEnd() {
    var appFrame = getKindleBookAppFrame();
    return appFrame
      .getElementById("kindleReader_footer")
      .innerText.includes("100%");
  }

  function done() {
    console.log(all);
  }

  function scrape() {
    setTimeout(() => {
      scrapeFrames()
        .then(frames => {
          console.log(".");
          all += frames.join("\n");
        })
        .then(turnPage)
        .then(() => {
          if (hasReachedEndSample() || hasReachedEnd()) {
            done();
          } else {
            scrape();
          }
        });
    }, 800);
  }
  scrape();
})();

My guess would be no... Granted I only spent about 5 minutes looking today, but I tried searching for words from the text I was reading in the source and none of the text seemed to be in the rendered page at all. The ajax responses on turning the page seemed to contain long and detailed instructions on how to draw the text.