1 files changed, 76 insertions, 0 deletions
diff --git a/browser/components/doh/DoHConfig.jsm b/browser/components/doh/DoHConfig.jsm
new file mode 100644
index 0000000000..1c3852bab9
--- /dev/null
+++ b/browser/components/doh/DoHConfig.jsm
@@ -0,0 +1,76 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+/*
+ * This module provides an interface to acces DoH config settings - e.g. whether
+ * DoH is enabled, whether capabilities are enabled, etc. Currently this just
+ * provides getters for prefs, but imminently will be extended to read config
+ * from a Remote Settings collection and filter by client region etc.
+ */
+var EXPORTED_SYMBOLS = ["Config"];
+
+const { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
+
+ChromeUtils.defineModuleGetter(
+  this,
+  "Preferences",
+  "resource://gre/modules/Preferences.jsm"
+);
+
+const kEnabledPref = "doh-rollout.enabled";
+
+const kTRRSelectionEnabledPref = "doh-rollout.trr-selection.enabled";
+const kTRRSelectionCommitResultPref = "doh-rollout.trr-selection.commit-result";
+
+const kProviderSteeringEnabledPref = "doh-rollout.provider-steering.enabled";
+const kProviderSteeringListPref = "doh-rollout.provider-steering.provider-list";
+
+const kPrefChangedTopic = "nsPref:changed";
+
+const Config = {
+  init() {
+    Preferences.observe(kEnabledPref, this);
+  },
+
+  observe(subject, topic, data) {
+    switch (topic) {
+      case kPrefChangedTopic:
+        this.notifyNewConfig();
+        break;
+    }
+  },
+
+  kConfigUpdateTopic: "doh-config-updated",
+  notifyNewConfig() {
+    Services.obs.notifyObservers(null, this.kConfigUpdateTopic);
+  },
+
+  get enabled() {
+    return Preferences.get(kEnabledPref, false);
+  },
+
+  trrSelection: {
+    get enabled() {
+      return Preferences.get(kTRRSelectionEnabledPref, false);
+    },
+
+    get commitResult() {
+      return Preferences.get(kTRRSelectionCommitResultPref, false);
+    },
+  },
+
+  providerSteering: {
+    get enabled() {
+      return Preferences.get(kProviderSteeringEnabledPref, false);
+    },
+
+    get providerList() {
+      return Preferences.get(kProviderSteeringListPref, "[]");
+    },
+  },
+};
+
+Config.init();