From 62df97a366923de638c0f45def3f76caa302a0c9 Mon Sep 17 00:00:00 2001
From: Gautam Singh <5769869+gautamsi@users.noreply.github.com>
Date: Wed, 23 Sep 2020 04:14:20 +0530
Subject: Patch getDisplayMedia for screen sharing in all services (#802)

Co-authored-by: Gautam Singh <gautamsi@users.noreply.github.com>
---
 src/webview/recipe.js | 131 ++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 126 insertions(+), 5 deletions(-)

diff --git a/src/webview/recipe.js b/src/webview/recipe.js
index c6724e35a..675f8e311 100644
--- a/src/webview/recipe.js
+++ b/src/webview/recipe.js
@@ -1,5 +1,5 @@
 /* eslint-disable import/first */
-import { ipcRenderer, remote } from 'electron';
+import { ipcRenderer, remote, desktopCapturer } from 'electron';
 import path from 'path';
 import { autorun, computed, observable } from 'mobx';
 import fs from 'fs-extra';
@@ -32,6 +32,69 @@ import { isDevMode } from '../environment';
 
 const debug = require('debug')('Ferdi:Plugin');
 
+const screenShareCss = `
+.desktop-capturer-selection {
+  position: fixed;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100vh;
+  background: rgba(30,30,30,.75);
+  color: #fff;
+  z-index: 10000000;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+.desktop-capturer-selection__scroller {
+  width: 100%;
+  max-height: 100vh;
+  overflow-y: auto;
+}
+.desktop-capturer-selection__list {
+  max-width: calc(100% - 100px);
+  margin: 50px;
+  padding: 0;
+  display: flex;
+  flex-wrap: wrap;
+  list-style: none;
+  overflow: hidden;
+  justify-content: center;
+}
+.desktop-capturer-selection__item {
+  display: flex;
+  margin: 4px;
+}
+.desktop-capturer-selection__btn {
+  display: flex;
+  flex-direction: column;
+  align-items: stretch;
+  width: 145px;
+  margin: 0;
+  border: 0;
+  border-radius: 3px;
+  padding: 4px;
+  background: #252626;
+  text-align: left;
+  transition: background-color .15s, box-shadow .15s;
+}
+.desktop-capturer-selection__btn:hover,
+.desktop-capturer-selection__btn:focus {
+  background: rgba(98,100,167,.8);
+}
+.desktop-capturer-selection__thumbnail {
+  width: 100%;
+  height: 81px;
+  object-fit: cover;
+}
+.desktop-capturer-selection__name {
+  margin: 6px 0 6px;
+  white-space: nowrap;
+  text-overflow: ellipsis;
+  overflow: hidden;
+}
+`;
+
 class RecipeController {
   @observable settings = {
     overrideSpellcheckerLanguage: false,
@@ -128,14 +191,15 @@ class RecipeController {
   }
 
   async loadUserFiles(recipe, config) {
+    const styles = document.createElement('style');
+    styles.innerHTML = screenShareCss;
+
     const userCss = path.join(recipe.path, 'user.css');
     if (await fs.exists(userCss)) {
       const data = await fs.readFile(userCss);
-      const styles = document.createElement('style');
-      styles.innerHTML = data.toString();
-
-      document.querySelector('head').appendChild(styles);
+      styles.innerHTML += data.toString();
     }
+    document.querySelector('head').appendChild(styles);
 
     const userJs = path.join(recipe.path, 'user.js');
     if (await fs.exists(userJs)) {
@@ -386,3 +450,60 @@ window.open = (url, frameName, features) => {
 if (isDevMode) {
   window.log = console.log;
 }
+
+// Patch getDisplayMedia for screen sharing
+window.navigator.mediaDevices.getDisplayMedia = () => new Promise(async (resolve, reject) => {
+  try {
+    const sources = await desktopCapturer.getSources({ types: ['screen', 'window'] });
+
+    const selectionElem = document.createElement('div');
+    selectionElem.classList = 'desktop-capturer-selection';
+    selectionElem.innerHTML = `
+        <div class="desktop-capturer-selection__scroller">
+          <ul class="desktop-capturer-selection__list">
+            ${sources.map(({
+    id, name, thumbnail,
+  }) => `
+              <li class="desktop-capturer-selection__item">
+                <button class="desktop-capturer-selection__btn" data-id="${id}" title="${name}">
+                  <img class="desktop-capturer-selection__thumbnail" src="${thumbnail.toDataURL()}" />
+                  <span class="desktop-capturer-selection__name">${name}</span>
+                </button>
+              </li>
+            `).join('')}
+          </ul>
+        </div>
+      `;
+    document.body.appendChild(selectionElem);
+
+    document.querySelectorAll('.desktop-capturer-selection__btn')
+      .forEach((button) => {
+        button.addEventListener('click', async () => {
+          try {
+            const id = button.getAttribute('data-id');
+            const mediaSource = sources.find(source => source.id === id);
+            if (!mediaSource) {
+              throw new Error(`Source with id ${id} does not exist`);
+            }
+
+            const stream = await window.navigator.mediaDevices.getUserMedia({
+              audio: false,
+              video: {
+                mandatory: {
+                  chromeMediaSource: 'desktop',
+                  chromeMediaSourceId: mediaSource.id,
+                },
+              },
+            });
+            resolve(stream);
+
+            selectionElem.remove();
+          } catch (err) {
+            reject(err);
+          }
+        });
+      });
+  } catch (err) {
+    reject(err);
+  }
+});
-- 
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