Allow restricting websites on which extension runs

1 files changed, 26 insertions, 0 deletions

diff --git a/lib/extension.js b/lib/extension.js
new file mode 100644
index 0000000..e74c877
--- /dev/null
+++ b/lib/extension.js
@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+"use strict";
+
+const defaultSettings = {
+  enableRegExp: ".*",
+};
+
+window.browser = window.browser ?? window.chrome;
+
+async function setSetting(setting, val) {
+  await browser.storage.sync.set({ [setting]: val });
+}
+
+async function getSetting(setting) {
+  return (
+    (await browser.storage.sync.get(setting))[setting] ??
+    defaultSettings[setting]
+  );
+}
+
+async function subEnabled() {
+  return new RegExp(
+    "^" + (await getSetting("enableRegExp")).replace(/\s+/g, "") + "$"
+  ).test(window.location.host);
+}