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s4s-packager
File size: 4,423 Bytes 
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import {isSafari, isStandalone} from './environment';
import escapeXML from '../common/escape-xml';
import {_} from '../locales';

const origin = isStandalone ? '*' : location.origin;

const getPreviewSource = () => `<!DOCTYPE html>

<html>

<head>

  <title>${escapeXML(_.translate('preview.loading'))}</title>

  <meta charset="utf-8">

  <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">

  <style>

  body {

    background: black;

    color: white;

    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;

  }

  .preview-message {

    background: inherit;

    display: flex;

    align-items: center;

    flex-direction: column;

    justify-content: center;

    text-align: center;

    position: absolute;

    top: 0;

    left: 0;

    width: 100%;

    height: 100%;

    user-select: none;

    -webkit-user-select: none;

  }

  .preview-progress-outer {

    width: 200px;

    height: 10px;

    border: 1px solid white;

  }

  .preview-progress-inner {

    height: 100%;

    width: 0;

    background: white;

  }

  [hidden] {

    display: none;

  }

  </style>

</head>

<body>

  <div class="preview-message">

    <noscript>Enable JavaScript</noscript>

    <div class="preview-progress-outer"><div class="preview-progress-inner"></div></div>

  </div>

  <div class="preview-message preview-error" hidden>

    <div class="preview-error-message"></div>

    <div>Go back to the original tab and try again</div>

  </div>

  <script>

  (function() {

    const origin = ${JSON.stringify(origin)};

    const err = (message) => {

      document.querySelector(".preview-error").hidden = false;

      document.querySelector(".preview-error-message").textContent = "Error: " + message;

    };

    if (!window.opener) {

      err("Can't communicate with main page.");

      return;

    }

    let hasRun = false;

    const progressBar = document.querySelector(".preview-progress-inner");

    const progressText = document.querySelector(".preview-progress-text");

    window.addEventListener("message", (e) => {

      if (origin !== "*" && e.origin !== location.origin) return;

      if (hasRun) return;

      if (e.data.blob) {

        hasRun = true;

        const fr = new FileReader();

        fr.onload = () => {

          document.open();

          document.write(fr.result);

          document.close(); // fixes poor performance in firefox

        };

        fr.onerror = () => {

          err("Something went wrong reading the file: " + fr.error);

        };

        fr.readAsText(e.data.blob);

      }

      if (typeof e.data.progress === "number") {

        progressBar.style.width = (e.data.progress * 100) + "%";

      }

    });

    window.opener.postMessage({

      preview: "hello"

    }, origin);

  })();

  </script>

</body>

</html>

`;
const windowToBlobMap = new WeakMap();

class Preview {
  constructor () {
    const preview = getPreviewSource();

    // Safari does not let file: URIs used by standalone version to open blob: URIs
    // The desktop app just doesn't support windows loaded from blobs
    const canUseBlobWindow = !(isStandalone && isSafari) && typeof IsDesktop === 'undefined';
    if (canUseBlobWindow) {
      const url = URL.createObjectURL(new Blob([preview], {
        type: 'text/html'
      })) + '#do-not-share-this-link-it-will-not-work-for-others';
      this.window = window.open(url);
    } else {
      this.window = window.open('about:blank');
      if (this.window) {
        this.window.document.write(preview);
      }
    }
    if (!this.window) {
      throw new Error('Cannot open popup');
    }
  }

  setContent (content) {
    windowToBlobMap.set(this.window, content);
    this.window.postMessage({
      blob: content
    }, origin);
  }

  setProgress (progress, text) {
    this.window.postMessage({
      progress,
      text
    }, origin);
  }

  close () {
    this.window.close();
  }
}

window.addEventListener('message', (e) => {
  if (origin !== '*' && e.origin !== location.origin) {
    return;
  }
  const data = e.data;
  if (data && data.preview === 'hello') {
    const source = e.source;
    const blob = windowToBlobMap.get(source);
    if (blob) {
      source.postMessage({
        blob
      }, origin);
    }
  }
});

export default Preview;