From 4894e8f2c4924359c5d8de4c33dfda269f03d093 Mon Sep 17 00:00:00 2001
From: Alan Jeffrey <ajeffrey@mozilla.com>
Date: Tue, 28 Jul 2020 16:47:11 -0500
Subject: [PATCH] Add a pref to indicate user intent to enter webxr

---
 components/config/prefs.rs        | 2 ++
 components/script/dom/xrsystem.rs | 9 +++++++--
 resources/prefs.json              | 1 +
 3 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/components/config/prefs.rs b/components/config/prefs.rs
index 9fa4075f606..a6d51943190 100644
--- a/components/config/prefs.rs
+++ b/components/config/prefs.rs
@@ -300,6 +300,8 @@ mod gen {
                         enabled: bool,
                     },
                     sessionavailable: bool,
+                    #[serde(rename = "dom.webxr.unsafe-assume-user-intent")]
+                    unsafe_assume_user_intent: bool,
                 },
                 worklet: {
                     blockingsleep: {
diff --git a/components/script/dom/xrsystem.rs b/components/script/dom/xrsystem.rs
index 798ba502aeb..29ecf4aa91f 100644
--- a/components/script/dom/xrsystem.rs
+++ b/components/script/dom/xrsystem.rs
@@ -26,6 +26,7 @@ use ipc_channel::ipc::{self as ipc_crate, IpcReceiver};
 use ipc_channel::router::ROUTER;
 use msg::constellation_msg::PipelineId;
 use profile_traits::ipc;
+use servo_config::pref;
 use std::cell::Cell;
 use std::rc::Rc;
 use webxr_api::{Error as XRError, Frame, Session, SessionInit, SessionMode};
@@ -161,8 +162,12 @@ impl XRSystemMethods for XRSystem {
 
         if mode != XRSessionMode::Inline {
             if !ScriptThread::is_user_interacting() {
-                promise.reject_error(Error::Security);
-                return promise;
+                if pref!(dom.webxr.unsafe_assume_user_intent) {
+                    warn!("The dom.webxr.unsafe-assume-user-intent preference assumes user intent to enter WebXR.");
+                } else {
+                    promise.reject_error(Error::Security);
+                    return promise;
+                }
             }
 
             if self.pending_or_active_session() {
diff --git a/resources/prefs.json b/resources/prefs.json
index 219e9dda394..8ea63008560 100644
--- a/resources/prefs.json
+++ b/resources/prefs.json
@@ -49,6 +49,7 @@
   "dom.webxr.layers.enabled": false,
   "dom.webxr.sessionavailable": false,
   "dom.webxr.test": false,
+  "dom.webxr.unsafe-assume-user-intent": false,
   "dom.worklet.timeout_ms": 10,
   "gfx.subpixel-text-antialiasing.enabled": true,
   "gfx.texture-swizzling.enabled": true,