From 0c94de7fcfa576751734dbd84aa4fd96676e31c9 Mon Sep 17 00:00:00 2001
From: Juan Cruz Viotti <jviottidc@gmail.com>
Date: Wed, 8 Jun 2016 11:10:46 -0400
Subject: [PATCH] Prevent exernal resources from being loaded by the WebView
 (#456)

If a user drags and drops an image, an HTML file, or other resource the
WebView understands, Electron will navigate away from the application
and load it up in the WebView, making the application unusable unless
the user restarts it.

Fixes: https://github.com/resin-io/etcher/issues/430
Signed-off-by: Juan Cruz Viotti <jviottidc@gmail.com>
---
 lib/gui/etcher.js | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/lib/gui/etcher.js b/lib/gui/etcher.js
index 39608970..2dd873dd 100644
--- a/lib/gui/etcher.js
+++ b/lib/gui/etcher.js
@@ -81,6 +81,13 @@ electron.app.on('ready', function() {
       electron.globalShortcut.unregisterAll();
     });
 
+    // Prevent external resources from being loaded (like images)
+    // when dropping them on the WebView.
+    // See https://github.com/electron/electron/issues/5919
+    mainWindow.webContents.on('will-navigate', function(event) {
+      event.preventDefault();
+    });
+
     mainWindow.loadURL(`file://${path.join(__dirname, 'index.html')}`);
   });
 });