1 files changed, 51 insertions, 0 deletions
diff --git a/dom/security/test/general/file_block_script_wrong_mime_sw.js b/dom/security/test/general/file_block_script_wrong_mime_sw.js
new file mode 100644
index 0000000000..4d8d667af4
--- /dev/null
+++ b/dom/security/test/general/file_block_script_wrong_mime_sw.js
@@ -0,0 +1,51 @@
+/**
+ * Service Worker that runs in 2 modes: 1) direct pass-through via
+ * fetch(event.request) and 2) indirect pass-through via
+ * fetch(event.request.url).
+ *
+ * Because this is updating a pre-existing mochitest that didn't use a SW and
+ * used a single test document, we use a SW idiom where the SW claims the
+ * existing window client.  And because we operate in two modes and we
+ * parameterize via URL, we also ensure that we skipWaiting.
+ **/
+
+/* eslint-env serviceworker */
+
+// We are parameterized by "mode".
+const params = new URLSearchParams(location.search);
+const fetchMode = params.get("fetchMode");
+
+// When activating on initial install, claim the existing window client.
+// For synchronziation, also message the controlled document to report our mode.
+self.addEventListener("activate", event => {
+  event.waitUntil(
+    (async () => {
+      await clients.claim();
+      const allClients = await clients.matchAll();
+      for (const client of allClients) {
+        client.postMessage({
+          fetchMode,
+        });
+      }
+    })()
+  );
+});
+
+// When updating the SW to change our mode of operation, skipWaiting so we
+// advance directly to activating without waiting for the test window client
+// to stop being controlled by our previous configuration.
+self.addEventListener("install", () => {
+  self.skipWaiting();
+});
+
+self.addEventListener("fetch", event => {
+  switch (fetchMode) {
+    case "direct":
+      event.respondWith(fetch(event.request));
+      break;
+
+    case "indirect":
+      event.respondWith(fetch(event.request.url));
+      break;
+  }
+});