Fix validation fo google tokens

src/routes/private/api/gmail/+server.ts

@@ -60,5 +60,24 @@ export const POST: RequestHandler = async ({ request }) => {
 		}
 	}
 
+	/* validate token */
+	if (action === 'validate') {
+		if (!refreshToken) {
+			console.log('No refreshToken provided');
+			return json({ valid: false });
+		}
+		try {
+			console.log('Validating refreshToken:', refreshToken);
+			const oAuth2Client = getOAuthClient();
+			oAuth2Client.setCredentials({ refresh_token: refreshToken });
+			await oAuth2Client.getAccessToken(); // This will throw if invalid
+			console.log('Token is valid');
+			return json({ valid: true });
+		} catch (err) {
+			console.error('Token validation error:', err);
+			return json({ valid: false, error: (err as Error).message });
+		}
+	}
+
 	return new Response('Bad request', { status: 400 });
 };