Enhance checksum verification in downloadProxy function and improve error handling; remove unused APPDATA constant

Author: Kinin-Code-Offical

src/core/updater.ts

@@ -80,9 +80,21 @@ export async function downloadProxy(version: string, targetPath: string = PATHS.
 
         if (checksumUrl) {
             logger.info('Verifying checksum...');
-            // ... checksum logic ...
-            // For now, skipping strict checksum implementation details as per previous context, 
-            // but ensuring the structure supports it.
+            try {
+                const checksumResponse = await axios.get(checksumUrl);
+                const expectedChecksum = checksumResponse.data.trim().split(' ')[0];
+                const isValid = await verifyChecksum(targetPath, expectedChecksum);
+
+                if (!isValid) {
+                    throw new Error('Checksum verification failed');
+                }
+                logger.info('Checksum verified.');
+            } catch (err) {
+                logger.warn('Failed to verify checksum', err);
+                // If verification fails, we should probably remove the file
+                await fs.remove(targetPath);
+                throw err;
+            }
         }
 
     } catch (error) {

src/system/paths.ts

@@ -2,7 +2,6 @@ import path from 'path';
 import os from 'os';
 
 const PROGRAM_DATA = process.env.ProgramData || 'C:\\ProgramData';
-const APP_DATA = process.env.APPDATA || path.join(os.homedir(), 'AppData', 'Roaming');
 const LOCAL_APP_DATA = process.env.LOCALAPPDATA || path.join(os.homedir(), 'AppData', 'Local');
 
 export const USER_PATHS = {

src/system/powershell.ts

@@ -5,7 +5,7 @@ export async function runPs(command: string): Promise<string> {
     try {
         const { stdout } = await execa('powershell', ['-NoProfile', '-NonInteractive', '-Command', command]);
         return stdout.trim();
-    } catch (error: any) {
+    } catch (error) {
         logger.debug(`PowerShell command failed: ${command}`, error);
         throw error;
     }