1 files changed, 57 insertions, 0 deletions
diff --git a/comm/mail/actors/LinkHandlerParent.sys.mjs b/comm/mail/actors/LinkHandlerParent.sys.mjs
new file mode 100644
index 0000000000..269405c4ff
--- /dev/null
+++ b/comm/mail/actors/LinkHandlerParent.sys.mjs
@@ -0,0 +1,57 @@
+/* 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/. */
+
+export class LinkHandlerParent extends JSWindowActorParent {
+  receiveMessage(msg) {
+    let browser = this.browsingContext.top.embedderElement;
+    if (!browser) {
+      return;
+    }
+
+    switch (msg.name) {
+      case "Link:SetIcon":
+        this.setIconFromLink(browser, msg.data.iconURL, msg.data.canUseForTab);
+        break;
+    }
+  }
+
+  setIconFromLink(browser, iconURL, canUseForTab) {
+    let tabmail = browser.ownerDocument.getElementById("tabmail");
+    if (!tabmail) {
+      return;
+    }
+
+    let tab = tabmail.getTabForBrowser(browser);
+    if (tab?.mode?.type != "contentTab") {
+      return;
+    }
+
+    let iconURI;
+    try {
+      iconURI = Services.io.newURI(iconURL);
+    } catch (ex) {
+      console.error(ex);
+      return;
+    }
+    if (iconURI.scheme != "data") {
+      try {
+        Services.scriptSecurityManager.checkLoadURIWithPrincipal(
+          browser.contentPrincipal,
+          iconURI,
+          Services.scriptSecurityManager.ALLOW_CHROME
+        );
+      } catch (ex) {
+        return;
+      }
+    }
+
+    if (canUseForTab) {
+      tabmail.setTabFavIcon(
+        tab,
+        iconURL,
+        "chrome://messenger/skin/icons/new/compact/draft.svg"
+      );
+    }
+  }
+}