1 files changed, 49 insertions, 0 deletions
diff --git a/browser/components/originattributes/test/browser/worker_blobify.js b/browser/components/originattributes/test/browser/worker_blobify.js
new file mode 100644
index 0000000000..20a1d8f2a0
--- /dev/null
+++ b/browser/components/originattributes/test/browser/worker_blobify.js
@@ -0,0 +1,49 @@
+// Wait for a string to be posted to this worker.
+// Create a blob containing this string, and then
+// post back a blob URL pointing to the blob.
+
+/* eslint-env worker */
+
+var postStringInBlob = function (blobObject) {
+  var fileReader = new FileReaderSync();
+  var result = fileReader.readAsText(blobObject);
+  postMessage(result);
+};
+
+self.addEventListener("message", e => {
+  if (e.data.what === "blobify") {
+    try {
+      let blobURL = URL.createObjectURL(new Blob([e.data.message]));
+      postMessage({ blobURL });
+    } catch (ex) {
+      postMessage({ error: ex.message });
+    }
+    return;
+  }
+
+  if (e.data.what === "deblobify") {
+    if ("error" in e.data.message) {
+      postMessage(e.data.message);
+      return;
+    }
+    let blobURL = e.data.message.blobURL,
+      xhr = new XMLHttpRequest();
+    try {
+      xhr.open("GET", blobURL, true);
+      xhr.onload = function () {
+        postStringInBlob(xhr.response);
+      };
+      xhr.onerror = function () {
+        postMessage({ error: "xhr error" });
+      };
+      xhr.responseType = "blob";
+      xhr.send();
+    } catch (ex) {
+      postMessage({ error: ex.message });
+    }
+
+    return;
+  }
+
+  postMessage("Invalid operation!");
+});