From 6a4784da44b0bf6d04dd8f3f12da77c2bc2ffb12 Mon Sep 17 00:00:00 2001
From: Juliusz Chroboczek <jch@irif.fr>
Date: Wed, 23 Sep 2020 21:46:30 +0200
Subject: [PATCH] Hide share button if getDisplayMedia doesn't exist.

---
 static/sfu.css | 4 ----
 static/sfu.js  | 5 ++++-
 2 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/static/sfu.css b/static/sfu.css
index 066af4e..e6b54ff 100644
--- a/static/sfu.css
+++ b/static/sfu.css
@@ -1013,10 +1013,6 @@ header .collapse {
         border-right: none;
     }
 
-    #sharebutton {
-        display: none;
-    }
-
     .dropdown-content {
         margin-top: 10px;
     }
diff --git a/static/sfu.js b/static/sfu.js
index 33ec084..c93c5bd 100644
--- a/static/sfu.js
+++ b/static/sfu.js
@@ -376,11 +376,14 @@ function setButtonsVisibility() {
     let permissions = serverConnection.permissions;
     let local = !!findUpMedia('local');
     let share = !!findUpMedia('screenshare')
+
     // don't allow multiple presentations
     setVisibility('presentbutton', permissions.present && !local);
     setVisibility('unpresentbutton', local);
+
     // allow multiple shared documents
-    setVisibility('sharebutton', permissions.present);
+    setVisibility('sharebutton', permissions.present &&
+                  ('getDisplayMedia' in navigator.mediaDevices))
     setVisibility('unsharebutton', share);
 
     setVisibility('mediaoptions', permissions.present);