[gnome-shell/mcatanzaro/sandbox-portal-helper] Sandbox the portal helper

[Michael Catanzaro <mcatanzaro src gnome org>]

commit a8d117eeb24644e6af3cc499fccb5f1b96b3e7de
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Wed Feb 5 22:18:11 2020 +0000

    Sandbox the portal helper
    
    The portal helper is rather sensitive because potentially-hostile Wi-Fi
    networks can decide to launch it whenever they want (by blocking the
    user's connection to the nmcheck domain) and load whatever web content
    they want into it. So having this unsandboxed is really extraordinarily
    risky. Previously it was a risk we had to accept, because WebKit did not
    have a web process sandbox, but now it does. So let's bubblewrap all the
    things!
    
    https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/983

 js/portalHelper/main.js | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/js/portalHelper/main.js b/js/portalHelper/main.js
index b0e568dacb..3f8587d543 100644
--- a/js/portalHelper/main.js
+++ b/js/portalHelper/main.js
@@ -118,6 +118,10 @@ class PortalWindow extends Gtk.ApplicationWindow {
         this._webContext = WebKit.WebContext.new_ephemeral();
         this._webContext.set_cache_model(WebKit.CacheModel.DOCUMENT_VIEWER);
         this._webContext.set_network_proxy_settings(WebKit.NetworkProxyMode.NO_PROXY, null);
+        if (WebKit.WebContext.set_sandbox_enabled) {
+            // We have WebKitGTK 2.26 or newer.
+            this._webContext.set_sandbox_enabled(true);
+        }
 
         this._webView = WebKit.WebView.new_with_context(this._webContext);
         this._webView.connect('decide-policy', this._onDecidePolicy.bind(this));