config-files: Move all the configuration files into config folder. (#508)

This commit moves all the configuration(.json) files into a config folder
if the config folder doesn't already exist. It also updates the places
where these files are being accessed with the new address.
This will help us zip the folder easily in the future.

app/renderer/js/utils/default-util.js

@@ -11,6 +11,7 @@ if (process.type === 'renderer') {
 const zulipDir = app.getPath('userData');
 const logDir = `${zulipDir}/Logs/`;
 const certificatesDir = `${zulipDir}/certificates/`;
+const configDir = `${zulipDir}/config/`;
 const initSetUp = () => {
 	// if it is the first time the app is running
 	// create zulip dir in userData folder to
@@ -28,6 +29,46 @@ const initSetUp = () => {
 			fs.mkdirSync(certificatesDir);
 		}
 
+		// Migrate config files from app data folder to config folder inside app
+		// data folder. This will be done once when a user updates to the new version.
+		if (!fs.existsSync(configDir)) {
+			fs.mkdirSync(configDir);
+			const domainJson = `${zulipDir}/domain.json`;
+			const certificatesJson = `${zulipDir}/certificates.json`;
+			const settingsJson = `${zulipDir}/settings.json`;
+			const updatesJson = `${zulipDir}/updates.json`;
+			const windowStateJson = `${zulipDir}/window-state.json`;
+			const configData = [
+				{
+					path: domainJson,
+					fileName: `domain.json`
+				},
+				{
+					path: certificatesJson,
+					fileName: `certificates.json`
+				},
+				{
+					path: settingsJson,
+					fileName: `settings.json`
+				},
+				{
+					path: updatesJson,
+					fileName: `updates.json`
+				}
+			];
+			configData.forEach(data => {
+				if (fs.existsSync(data.path)) {
+					fs.copyFileSync(data.path, configDir + data.fileName);
+					fs.unlinkSync(data.path);
+				}
+			});
+			// window-state.json is only deleted not moved, as the electron-window-state
+			// package will recreate the file in the config folder.
+			if (fs.existsSync(windowStateJson)) {
+				fs.unlinkSync(windowStateJson);
+			}
+		}
+
 		setupCompleted = true;
 	}
 };