disable service workers when scripts are blocked

1 files changed, 22 insertions, 0 deletions

diff --git a/content/main.js b/content/main.js
index cc7692a..6478ea0 100644
--- a/content/main.js
+++ b/content/main.js
@@ -304,6 +304,27 @@ http-equiv="Content-Security-Policy" content="${make_csp_rule(policy)}"\
     start_data_urls_sanitizing(doc);
 }
 
+async function disable_service_workers()
+{
+    if (!navigator.serviceWorker)
+	return;
+
+    const registrations = await navigator.serviceWorker.getRegistrations();
+    if (registrations.length === 0)
+	return;
+
+    console.warn("Service Workers detected on this page! Unregistering and reloading");
+
+    try {
+	await Promise.all(registrations.map(r => r.unregister()));
+    } finally {
+	location.reload();
+    }
+
+    /* Never actually return! */
+    return new Promise(() => 0);
+}
+
 if (!is_privileged_url(document.URL)) {
     let policy_received_callback = () => undefined;
     let policy;
@@ -343,6 +364,7 @@ if (!is_privileged_url(document.URL)) {
 
     const doc_ready = Promise.all([
 	policy.allow ? Promise.resolve() : sanitize_document(document, policy),
+	policy.allow ? Promise.resolve() : disable_service_workers(),
 	wait_loaded(document)
     ]);