1 files changed, 35 insertions, 0 deletions
diff --git a/testing/web-platform/tests/web-locks/resources/sw-controlled-iframe.html b/testing/web-platform/tests/web-locks/resources/sw-controlled-iframe.html
new file mode 100644
index 0000000000..bc5c9bdb83
--- /dev/null
+++ b/testing/web-platform/tests/web-locks/resources/sw-controlled-iframe.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>iframe used in clientId test</title>
+<script>
+
+self.onmessage = async event => {
+  try {
+    if (event.data === 'get_sw_client_id') {
+      // Use the controlling service worker to determine
+      // this client's id according to the Service Worker.
+      const response = await fetch('/clientId');
+      const data = await response.json();
+      window.parent.postMessage(data.clientId, '*');
+      return;
+    }
+
+    if (event.data === 'get_lock_client_id') {
+      // Grab a lock, then query the lock manager for state to
+      // determine this client's id according to the lock manager.
+      await navigator.locks.request('lock-name', async lock => {
+        const lock_state = await navigator.locks.query();
+        const held_lock = lock_state.held.filter(l => l.name === lock.name)[0];
+        window.parent.postMessage(held_lock.clientId, '*');
+      });
+      return;
+    }
+
+    window.parent.postMessage(`unknown request: ${event.data}`, '*');
+  } catch (ex) {
+    // In case of test failure, don't leave parent window hanging.
+    window.parent.postMessage(`${ex.name}: ${ex.message}`, '*');
+  }
+};
+
+</script>