1 files changed, 42 insertions, 0 deletions
diff --git a/comm/mail/actors/MailLinkChild.jsm b/comm/mail/actors/MailLinkChild.jsm
new file mode 100644
index 0000000000..401b869fad
--- /dev/null
+++ b/comm/mail/actors/MailLinkChild.jsm
@@ -0,0 +1,42 @@
+/* vim: set ts=2 sw=2 et tw=80: */
+/* 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";
+
+const EXPORTED_SYMBOLS = ["MailLinkChild"];
+
+const PROTOCOLS = ["mailto:", "mid:", "news:", "snews:"];
+
+class MailLinkChild extends JSWindowActorChild {
+  handleEvent(event) {
+    let href = event.target.href;
+    let location = this.document.location;
+    if (
+      !href ||
+      // Do nothing if not the main button clicked.
+      event.button > 0 ||
+      // Do nothing if in the compose window.
+      location.href == "about:blank?compose"
+    ) {
+      return;
+    }
+
+    let url = new URL(href);
+    let protocol = url.protocol;
+    if (
+      PROTOCOLS.includes(protocol) ||
+      // A link to an attachment, e.g. cid: link.
+      (["imap:", "mailbox:"].includes(protocol) &&
+        url.searchParams.get("part") &&
+        // Prevent opening new tab for internal pdf link.
+        (!location.search.includes("part=") ||
+          url.origin != location.origin ||
+          url.pathname != location.pathname))
+    ) {
+      this.sendAsyncMessage(protocol, href);
+      event.preventDefault();
+    }
+  }
+}