fix: open links externally in Quick CSS editor (#1487)

Co-authored-by: V <vendicated@riseup.net>

src/main/ipcMain.ts

@@ -31,6 +31,7 @@ import monacoHtml from "~fileContent/../components/monacoWin.html;base64";
 
 import { getThemeInfo, stripBOM, UserThemeHeader } from "./themes";
 import { ALLOWED_PROTOCOLS, QUICKCSS_PATH, SETTINGS_DIR, SETTINGS_FILE, THEMES_DIR } from "./utils/constants";
+import { makeLinksOpenExternally } from "./utils/externalLinks";
 
 mkdirSync(SETTINGS_DIR, { recursive: true });
 mkdirSync(THEMES_DIR, { recursive: true });
@@ -143,5 +144,8 @@ ipcMain.handle(IpcEvents.OPEN_MONACO_EDITOR, async () => {
             sandbox: false
         }
     });
+
+    makeLinksOpenExternally(win);
+
     await win.loadURL(`data:text/html;base64,${monacoHtml}`);
 });

src/main/utils/externalLinks.ts

@@ -0,0 +1,48 @@
+/*
+ * Vencord, a modification for Discord's desktop app
+ * Copyright (c) 2023 Vendicated and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+import { type BrowserWindow, shell } from "electron";
+
+export function makeLinksOpenExternally(win: BrowserWindow) {
+    win.webContents.setWindowOpenHandler(({ url }) => {
+        switch (url) {
+            case "about:blank":
+            case "https://discord.com/popout":
+            case "https://ptb.discord.com/popout":
+            case "https://canary.discord.com/popout":
+                return { action: "allow" };
+        }
+
+        try {
+            var { protocol } = new URL(url);
+        } catch {
+            return { action: "deny" };
+        }
+
+        switch (protocol) {
+            case "http:":
+            case "https:":
+            case "mailto:":
+            case "steam:":
+            case "spotify:":
+                shell.openExternal(url);
+        }
+
+        return { action: "deny" };
+    });
+}