1 files changed, 111 insertions, 0 deletions
diff --git a/testing/web-platform/tests/workers/dedicated-worker-in-data-url-context.window.js b/testing/web-platform/tests/workers/dedicated-worker-in-data-url-context.window.js
new file mode 100644
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+++ b/testing/web-platform/tests/workers/dedicated-worker-in-data-url-context.window.js
@@ -0,0 +1,111 @@
+// META: title=data URL dedicated worker in data URL context
+// META: script=/service-workers/service-worker/resources/test-helpers.sub.js
+const mimeType = 'application/javascript';
+
+// Tests creating a dedicated 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 dedicated 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 Worker('${nestedWorkerScriptURL}');
+        worker.onmessage = e => {
+          window.parent.postMessage(
+              'Worker construction unexpectedly succeeded', '*');
+        };
+        worker.onerror = e => window.parent.postMessage('PASS', '*');
+      } catch (e) {
+        // Cross-origin request should asynchronously fail during worker script
+        // fetch because its request mode is 'same-origin'.
+        window.parent.postMessage(
+            'Worker construction unexpectedly synchronously failed', '*');
+      }
+      </script>
+  `;
+
+  const p = new Promise(r => window.onmessage = e => r(e.data));
+  const frame = await with_iframe(`data:text/html;base64,${btoa(frameCode)}`);
+  const result = await p;
+  assert_equals(result, 'PASS');
+}, 'Create a dedicated worker in a data url frame');
+
+// Tests creating a dedicated worker in a data URL dedicated worker (i.e.,
+// nested dedicated worker).
+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 dedicated worker. The worker tries
+  // to create a nested dedicated worker from |nestedWorkerScriptURL|, but that
+  // should result in a failure. This is because the data URL dedicated worker
+  // has an opaque origin, and script fetch is handled as a cross-origin
+  // request.
+  const workerCode = `
+      try {
+        const worker = new Worker('${nestedWorkerScriptURL}');
+        worker.onmessage =
+            e => postMessage('Worker construction unexpectedly succeeded');
+        worker.onerror = e => postMessage('PASS');
+      } catch (e) {
+        // Cross-origin request should asynchronously fail during worker script
+        // fetch because its request mode is 'same-origin'.
+        postMessage('Worker construction unexpectedly synchronously failed');
+      }
+  `;
+
+  const result = await new Promise((resolve, reject) => {
+    const worker = new Worker(`data:${mimeType};base64,${btoa(workerCode)}`);
+    worker.onmessage = e => resolve(e.data);
+    worker.onerror = e => reject(e.message);
+  });
+  assert_equals(result, 'PASS');
+}, 'Create a dedicated worker in a data url dedicated worker');
+
+// Tests creating a data URL dedicated worker in a data URL iframe.
+promise_test(async t => {
+  // This code will be executed in a data URL iframe. The iframe tries to create
+  // a data URL dedicated worker. Fetching a data URL from the data URL iframe
+  // whose origin is opaque is allowed, so the worker construction should
+  // succeed. The iframe posts the result to the parent frame.
+  const frameCode = `
+      <script>
+      const worker = new Worker('data:${mimeType},postMessage("PASS");');
+      worker.onmessage = e => window.parent.postMessage(e.data, '*');
+      worker.onerror = e => {
+        window.parent.postMessage('FAIL: ' + e.message, '*');
+      };
+      </script>
+  `;
+
+  const p = new Promise(r => window.onmessage = e => r(e.data));
+  const frame = await with_iframe(`data:text/html;base64,${btoa(frameCode)}`);
+  const result = await p;
+  assert_equals(result, 'PASS');
+}, 'Create a data url dedicated worker in a data url frame');
+
+// Tests creating a data URL dedicated worker in a data URL dedicated worker
+// (i.e., nested dedicated worker).
+promise_test(async t => {
+  // This code will be executed in a data URL dedicated worker. The worker tries
+  // to create a nested data URL dedicated worker. Fetching a data URL from the
+  // data URL dedicated worker is allowed, so the worker construction should
+  // succeed. The worker posts the result to the parent frame.
+  const workerCode = `
+      const worker = new Worker('data:${mimeType},postMessage("PASS");');
+      worker.onmessage = e => postMessage(e.data);
+      worker.onerror = e => postMessage('FAIL: ' + e.message);
+  `;
+
+  const result = await new Promise((resolve, reject) => {
+    const worker = new Worker(`data:${mimeType};base64,${btoa(workerCode)}`);
+    worker.onmessage = e => resolve(e.data);
+    worker.onerror = e => reject(e.message);
+  });
+  assert_equals(result, 'PASS');
+}, 'Create a data url dedicated worker in a data url dedicated worker');