1 files changed, 39 insertions, 0 deletions
diff --git a/devtools/client/application/src/reducers/page-state.js b/devtools/client/application/src/reducers/page-state.js
new file mode 100644
index 0000000000..ef3b6c970d
--- /dev/null
+++ b/devtools/client/application/src/reducers/page-state.js
@@ -0,0 +1,39 @@
+/* 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";
+
+const {
+  UPDATE_DOMAIN,
+} = require("resource://devtools/client/application/src/constants.js");
+
+function PageState() {
+  return {
+    // Domain
+    domain: null,
+  };
+}
+
+function getDomainFromUrl(url) {
+  return new URL(url).hostname;
+}
+
+function pageReducer(state = PageState(), action) {
+  switch (action.type) {
+    case UPDATE_DOMAIN: {
+      const { url } = action;
+      return {
+        domain: getDomainFromUrl(url),
+      };
+    }
+
+    default:
+      return state;
+  }
+}
+
+module.exports = {
+  PageState,
+  pageReducer,
+};