Add additional build flavours for Vencord Desktop (#765)

src/main/patchWin32Updater.ts

@@ -0,0 +1,99 @@
+/*
+ * Vencord, a modification for Discord's desktop app
+ * Copyright (c) 2022 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 { app, autoUpdater } from "electron";
+import { existsSync, mkdirSync, readdirSync, renameSync, statSync, writeFileSync } from "fs";
+import { basename, dirname, join } from "path";
+
+const { setAppUserModelId } = app;
+
+// Apparently requiring Discords updater too early leads into issues,
+// copied this workaround from powerCord
+app.setAppUserModelId = function (id: string) {
+    app.setAppUserModelId = setAppUserModelId;
+
+    setAppUserModelId.call(this, id);
+
+    patchUpdater();
+};
+
+function isNewer($new: string, old: string) {
+    const newParts = $new.slice(4).split(".").map(Number);
+    const oldParts = old.slice(4).split(".").map(Number);
+
+    for (let i = 0; i < oldParts.length; i++) {
+        if (newParts[i] > oldParts[i]) return true;
+        if (newParts[i] < oldParts[i]) return false;
+    }
+    return false;
+}
+
+function patchLatest() {
+    try {
+        const currentAppPath = dirname(process.execPath);
+        const currentVersion = basename(currentAppPath);
+        const discordPath = join(currentAppPath, "..");
+
+        const latestVersion = readdirSync(discordPath).reduce((prev, curr) => {
+            return (curr.startsWith("app-") && isNewer(curr, prev))
+                ? curr
+                : prev;
+        }, currentVersion as string);
+
+        if (latestVersion === currentVersion) return;
+
+        const resources = join(discordPath, latestVersion, "resources");
+        const app = join(resources, "app.asar");
+        const _app = join(resources, "_app.asar");
+
+        if (!existsSync(app) || statSync(app).isDirectory()) return;
+
+        console.info("[Vencord] Detected Host Update. Repatching...");
+
+        renameSync(app, _app);
+        mkdirSync(app);
+        writeFileSync(join(app, "package.json"), JSON.stringify({
+            name: "discord",
+            main: "index.js"
+        }));
+        writeFileSync(join(app, "index.js"), `require(${JSON.stringify(join(__dirname, "patcher.js"))});`);
+    } catch (err) {
+        console.error("[Vencord] Failed to repatch latest host update", err);
+    }
+}
+
+// Windows Host Updates install to a new folder app-{HOST_VERSION}, so we
+// need to reinject
+function patchUpdater() {
+    try {
+        const autoStartScript = join(require.main!.filename, "..", "autoStart", "win32.js");
+        const { update } = require(autoStartScript);
+
+        require.cache[autoStartScript]!.exports.update = function () {
+            update.apply(this, arguments);
+            patchLatest();
+        };
+    } catch {
+        // OpenAsar uses electrons autoUpdater on Windows
+        const { quitAndInstall } = autoUpdater;
+        autoUpdater.quitAndInstall = function () {
+            patchLatest();
+            quitAndInstall.call(this);
+        };
+    }
+}