Add basic desktop UI - systray

This PR adds a basic UI for desktop
applications that support Linux, Max
and Windows.

client/ui/config/config.go

@@ -0,0 +1,46 @@
+package config
+
+import (
+	"os"
+	"runtime"
+)
+
+// ClientConfig basic settings for the UI application.
+type ClientConfig struct {
+	configPath string
+	logFile    string
+	daemonAddr string
+}
+
+// Config object with default settings.
+//
+// We are creating this package to extract utility functions from the cmd package
+// reading and parsing the configurations for the client should be done here
+func Config() *ClientConfig {
+	defaultConfigPath := "/etc/wiretrustee/config.json"
+	defaultLogFile := "/var/log/wiretrustee/client.log"
+	if runtime.GOOS == "windows" {
+		defaultConfigPath = os.Getenv("PROGRAMDATA") + "\\Wiretrustee\\" + "config.json"
+		defaultLogFile = os.Getenv("PROGRAMDATA") + "\\Wiretrustee\\" + "client.log"
+	}
+
+	defaultDaemonAddr := "unix:///var/run/wiretrustee.sock"
+	if runtime.GOOS == "windows" {
+		defaultDaemonAddr = "tcp://127.0.0.1:41731"
+	}
+	return &ClientConfig{
+		configPath: defaultConfigPath,
+		logFile:    defaultLogFile,
+		daemonAddr: defaultDaemonAddr,
+	}
+}
+
+// DaemonAddr of the gRPC API.
+func (c *ClientConfig) DaemonAddr() string {
+	return c.daemonAddr
+}
+
+// LogFile path.
+func (c *ClientConfig) LogFile() string {
+	return c.logFile
+}