1 files changed, 70 insertions, 0 deletions
diff --git a/toolkit/components/aboutwindowsmessages/content/aboutWindowsMessages.js b/toolkit/components/aboutwindowsmessages/content/aboutWindowsMessages.js
new file mode 100644
index 0000000000..4aef3d0dd7
--- /dev/null
+++ b/toolkit/components/aboutwindowsmessages/content/aboutWindowsMessages.js
@@ -0,0 +1,70 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+let AboutWindowsMessages = null;
+
+function refreshMessages() {
+  let windowMessages = {};
+  let windowTitles = {};
+  AboutWindowsMessages.getMessages(window, windowMessages, windowTitles);
+  let windowsDiv = document.getElementById("windows-div");
+  windowsDiv.innerHTML = "";
+  const templateCard = document.querySelector("template[name=window-card]");
+  for (let i = 0; i < windowTitles.value.length; ++i) {
+    let windowCard = templateCard.content
+      .cloneNode(true)
+      .querySelector("details");
+    // open the current window by default
+    windowCard.open = i === 0;
+    let summary = windowCard.querySelector("summary");
+    let titleSpan = summary.querySelector("h3.window-card-title");
+    titleSpan.appendChild(document.createTextNode(windowTitles.value[i]));
+    titleSpan.classList.toggle("current-window", windowCard.open);
+    let copyButton = summary.querySelector("button");
+    copyButton.addEventListener("click", async e => {
+      e.target.disabled = true;
+      await copyMessagesToClipboard(e);
+      e.target.disabled = false;
+    });
+    let innerUl = document.createElement("ul");
+    for (let j = 0; j < windowMessages.value[i].length; ++j) {
+      let innerLi = document.createElement("li");
+      innerLi.className = "message";
+      innerLi.innerText = windowMessages.value[i][j];
+      innerUl.appendChild(innerLi);
+    }
+    windowCard.appendChild(innerUl);
+    windowsDiv.append(windowCard);
+  }
+}
+
+async function copyMessagesToClipboard(event) {
+  const details = event.target.parentElement.parentElement;
+  // Avoid copying the window name as it is Category 3 data,
+  // and only useful for the user to identify which window
+  // is which.
+  const messagesText =
+    Array.from(details.querySelector("ul").children)
+      .map(li => li.innerText)
+      .join("\n") + "\n";
+
+  await navigator.clipboard.writeText(messagesText);
+}
+
+function onLoad() {
+  refreshMessages();
+}
+
+try {
+  AboutWindowsMessages = Cc["@mozilla.org/about-windowsmessages;1"].getService(
+    Ci.nsIAboutWindowsMessages
+  );
+  document.addEventListener("DOMContentLoaded", onLoad, { once: true });
+} catch (ex) {
+  // Do nothing if we fail to create a singleton instance,
+  // showing the default no-module message.
+  Cu.reportError(ex);
+}