2 files changed, 112 insertions, 0 deletions
diff --git a/app/assets/javascripts/blob/balsamiq/balsamiq_viewer.js b/app/assets/javascripts/blob/balsamiq/balsamiq_viewer.js
new file mode 100644
index 00000000000..5bcd7d5eccc
--- /dev/null
+++ b/app/assets/javascripts/blob/balsamiq/balsamiq_viewer.js
@@ -0,0 +1,106 @@
+/* global Flash */
+
+import sqljs from 'sql.js';
+import { template as _template } from 'underscore';
+import Spinner from '../../spinner';
+
+class BalsamiqViewer {
+  constructor(viewer) {
+    this.viewer = viewer;
+    this.endpoint = this.viewer.dataset.endpoint;
+    this.spinner = new Spinner(this.viewer);
+  }
+
+  loadFile() {
+    const xhr = new XMLHttpRequest();
+
+    xhr.open('GET', this.endpoint, true);
+    xhr.responseType = 'arraybuffer';
+
+    xhr.onload = this.renderFile.bind(this);
+    xhr.onerror = BalsamiqViewer.onError;
+
+    this.spinner.start();
+
+    xhr.send();
+  }
+
+  renderFile(loadEvent) {
+    this.spinner.stop();
+
+    const container = document.createElement('ul');
+
+    this.initDatabase(loadEvent.target.response);
+
+    const previews = this.getPreviews();
+    const renderedPreviews = previews.map(preview => this.renderPreview(preview));
+
+    container.innerHTML = renderedPreviews.join('');
+    container.classList.add('list-inline', 'previews');
+
+    this.viewer.appendChild(container);
+  }
+
+  initDatabase(data) {
+    const previewBinary = new Uint8Array(data);
+
+    this.database = new sqljs.Database(previewBinary);
+  }
+
+  getPreviews() {
+    const thumbnails = this.database.exec('SELECT * FROM thumbnails');
+
+    return thumbnails[0].values.map(BalsamiqViewer.parsePreview);
+  }
+
+  getTitle(resourceID) {
+    return this.database.exec(`SELECT * FROM resources WHERE id = '${resourceID}'`);
+  }
+
+  renderPreview(preview) {
+    const previewElement = document.createElement('li');
+
+    previewElement.classList.add('preview');
+    previewElement.innerHTML = this.renderTemplate(preview);
+
+    return previewElement.outerHTML;
+  }
+
+  renderTemplate(preview) {
+    const title = this.getTitle(preview.resourceID);
+    const name = BalsamiqViewer.parseTitle(title);
+    const image = preview.image;
+
+    const template = BalsamiqViewer.PREVIEW_TEMPLATE({
+      name,
+      image,
+    });
+
+    return template;
+  }
+
+  static parsePreview(preview) {
+    return JSON.parse(preview[1]);
+  }
+
+  static parseTitle(title) {
+    return JSON.parse(title[0].values[0][2]).name;
+  }
+
+  static onError() {
+    const flash = new Flash('Balsamiq file could not be loaded.');
+
+    return flash;
+  }
+}
+
+BalsamiqViewer.PREVIEW_TEMPLATE = _template(`
+  <div class="panel panel-default">
+    <div class="panel-heading"><%- name %></div>
+    <div class="panel-body">
+      <img class="img-thumbnail" src="data:image/png;base64,<%- image %>"/>
+    </div>
+  </div>
+`);
+
+export default BalsamiqViewer;
diff --git a/app/assets/javascripts/blob/balsamiq_viewer.js b/app/assets/javascripts/blob/balsamiq_viewer.js
new file mode 100644
index 00000000000..1dacf84470f
--- /dev/null
+++ b/app/assets/javascripts/blob/balsamiq_viewer.js
@@ -0,0 +1,6 @@
+import BalsamiqViewer from './balsamiq/balsamiq_viewer';
+
+document.addEventListener('DOMContentLoaded', () => {
+  const balsamiqViewer = new BalsamiqViewer(document.getElementById('js-balsamiq-viewer'));
+  balsamiqViewer.loadFile();
+});