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-rw-r--r--browser/extensions/screenshots/assertIsTrusted.js24
1 files changed, 24 insertions, 0 deletions
diff --git a/browser/extensions/screenshots/assertIsTrusted.js b/browser/extensions/screenshots/assertIsTrusted.js
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index 0000000000..5e2a072f37
--- /dev/null
+++ b/browser/extensions/screenshots/assertIsTrusted.js
@@ -0,0 +1,24 @@
+/* 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/. */
+
+/** For use with addEventListener, assures that any events have event.isTrusted set to true
+ https://developer.mozilla.org/en-US/docs/Web/API/Event/isTrusted
+ Should be applied *inside* catcher.watchFunction
+*/
+this.assertIsTrusted = function assertIsTrusted(handlerFunction) {
+ return function (event) {
+ if (!event) {
+ const exc = new Error("assertIsTrusted did not get an event");
+ exc.noPopup = true;
+ throw exc;
+ }
+ if (!event.isTrusted) {
+ const exc = new Error(`Received untrusted event (type: ${event.type})`);
+ exc.noPopup = true;
+ throw exc;
+ }
+ return handlerFunction.call(this, event);
+ };
+};
+null;