1 files changed, 65 insertions, 0 deletions
diff --git a/testing/web-platform/tests/workers/shared-worker-in-data-url-context.window.js b/testing/web-platform/tests/workers/shared-worker-in-data-url-context.window.js
new file mode 100644
index 0000000000..b768c815d0
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+++ b/testing/web-platform/tests/workers/shared-worker-in-data-url-context.window.js
@@ -0,0 +1,65 @@
+// META: title=data URL shared worker in data URL context
+// META: script=/service-workers/service-worker/resources/test-helpers.sub.js
+const mimeType = 'application/javascript';
+
+// Tests creating a data URL shared worker in a data URL iframe.
+promise_test(async t => {
+  const nestedWorkerScriptURL =
+      new URL('/workers/support/post-message-on-load-worker.js', location.href);
+
+  // This code will be executed in a data URL iframe. The iframe tries to create
+  // a shared worker from |nestedWorkerScriptURL|, but that should result in a
+  // failure. This is because the data URL iframe has an opaque origin, and
+  // script fetch is handled as a cross-origin request.
+  const frameCode = `
+      <script>
+      try {
+        const worker = new SharedWorker('${nestedWorkerScriptURL}');
+        worker.port.onmessage = e => {
+          window.parent.postMessage(
+              'SharedWorker construction unexpectedly succeeded', '*');
+        };
+        worker.onerror = e => window.parent.postMessage('PASS', '*');
+      } catch (e) {
+        // Cross-origin request should asynchronously fail during worker script
+        // fetch because its request mode is 'same-origin'.
+        window.parent.postMessage(
+            'SharedWorker construction unexpectedly synchronously failed', '*');
+      }
+      </script>
+  `;
+
+  const p = new Promise(r => window.onmessage = e => r(e.data));
+  const frame = await with_iframe(`data:text/html;base64,${btoa(frameCode)}`);
+  const result = await p;
+  assert_equals(result, 'PASS');
+}, 'Create a shared worker in a data url frame');
+
+// Tests creating a data URL shared worker in a data URL iframe.
+promise_test(async t => {
+  const workerCode = `onconnect = e => e.ports[0].postMessage("PASS");`;
+
+  // This code will be executed in a data URL iframe. The iframe tries to create
+  // a data URL shared worker. Fetching a data URL from the data URL shared
+  // worker is allowed, so the worker construction should succeed. The worker
+  // posts the result to the parent frame.
+  const frameCode = `
+      <script>
+      try {
+        const worker = new SharedWorker('data:${mimeType},${workerCode};');
+        worker.port.onmessage = e => window.parent.postMessage(e.data, '*');
+        worker.onerror = e => {
+          window.parent.postMessage('FAIL: ' + e.message, '*');
+        };
+      } catch (e) {
+        window.parent.postMessage(
+            'SharedWorker construction unexpectedly synchronously failed', '*');
+      }
+      </script>
+  `;
+
+  const p = new Promise(r => window.onmessage = e => r(e.data));
+  const frame = await with_iframe(`data:text/html;base64,${btoa(frameCode)}`);
+  const result = await p;
+  assert_equals(result, 'PASS');
+}, 'Create a data url shared worker in a data url frame');