[AsarUpdate] Initial Add, autoupdate after Discord startup

README.md

@@ -16,6 +16,7 @@ Below is a list in order of priority, marked as complete when finished:
 - [ ] A bunch of specific minor fixes / features
   - [X] Handle hardware acceleration
   - [ ] Add Discord-specific Electron flags?
+- [ ] Asar auto-updating
 - [ ] Multi-instance handling
 - [ ] Auto start
 - [ ] First run
@@ -39,8 +40,9 @@ Custom patches are another main goal of OpenAsar, patching enhancements where ot
 
 ## Config
 You can configure OpenAsar via `settings.json` (found in your Discord app data / user data), under a `openasar` object. Keep in mind most options are defaults for good reason, they may temporarily brick your client until you revert your changes. The avaliable options are:
-- `quickstart` (bool) - enables Quickstart (experimental)
-- `skipStartupUpdateChecks` (bool) - skips startup update checking (Linux-only)
+- `quickstart` (bool, default false) - whether to use Quickstart (experimental)
+- `skipStartupUpdateChecks` (bool, default false) - skips startup update checking (Linux-only)
+- `autoupdate` (bool, default true) - whether to autoupdate OpenAsar after Discord startup
 
 An example of a settings.json with OpenAsar config:
 ```json

src/asarUpdate.js

@@ -0,0 +1,54 @@
+const request = require('request');
+const fs = require('original-fs'); // Use original-fs, not Electron's modified fs
+const crypto = require('crypto');
+const electron = require('electron');
+const { join } = require('path');
+
+const asarPath = join(require.main.filename, '..');
+log('AsarUpdate', 'Asar Path:', asarPath);
+
+const downloadUrls = {
+  nightly: 'https://github.com/GooseMod/OpenAsar/releases/download/nightly/openasar.asar'
+};
+
+const channel = 'nightly'; // Have prod, etc. once stable / 1.0
+
+const getAsarHash = () => crypto.createHash('sha512').update(fs.readFileSync(asarPath)).digest('hex');
+
+module.exports = () => { // (Try) update asar
+  log('AsarUpdate', 'Updating...');
+
+  const asarUrl = downloadUrls[channel];
+  log('AsarUpdate', 'Release Channel:', channel, 'Download URL:', asarUrl);
+
+  const originalHash = getAsarHash();
+  log('AsarUpdate', 'Original Hash:', originalHash);
+
+  const file = fs.createWriteStream(asarPath);
+  log('AsarUpdate', 'Opened write stream to asar');
+
+  request(asarUrl, (_err, res) => {
+    log('AsarUpdate', 'Piping download response to stream');
+    res.pipe(file);
+  });
+
+  file.on('finish', () => {
+    file.close();
+    log('AsarUpdate', 'Completed download');
+
+    const newHash = getAsarHash();
+    const changed = originalHash !== newHash;
+
+    log('AsarUpdate', `Hash Comparison:
+Original Hash: ${originalHash}
+New Hash: ${newHash}
+Changed: ${changed}`);
+
+    if (changed) {
+      electron.dialog.showMessageBox(null, {
+        message: 'Updated OpenAsar',
+        detail: `New version will be used next restart.`
+      });
+    }
+  });
+};

src/bootstrap.js

@@ -53,6 +53,18 @@ const startUpdate = () => {
   }, () => {
     log('Bootstrap', 'Setting main window visible');
     desktopCore.setMainWindowVisible(true);
+
+    setTimeout(() => { // Try to update our asar
+      if (!oaConfig.autoupdate) return; // If autoupdate disabled, don't update
+
+      const asarUpdate = require('./asarUpdate');
+
+      try {
+        asarUpdate();
+      } catch (e) {
+        log('AsarUpdate', 'Failed to update', e);
+      }
+    }, 1000);
   });
 };