tsviewer/config/config.go

package config

import (
	"os"
	"strconv"

	"github.com/spf13/viper"
)

type Config struct {
	User struct {
		Nickname string
		Name     string
		Password string
	}
	ServerTS struct {
		IP         string
		PortServer uint16
		PortQuery  uint16
	}
	ServerWeb struct {
		Port uint16
	}
}

const FileName = "config.json"

func New() (*Config, error) {
	viper.SetConfigName("config")
	viper.SetConfigFile("yaml")
	viper.AddConfigPath(".")
	if err := viper.ReadInConfig(); err != nil {
		return nil, err
	}

	setDefaults()

	var config Config
	err := viper.Unmarshal(&config)

	config.overrideWithEnvironmentVars()

	return &config, err
}

func setDefaults() {
	viper.SetDefault("User.Nickname", "serveradmin")
	viper.SetDefault("User.Name", "serveradmin")
	viper.SetDefault("User.Password", "<changeMe>")
	viper.SetDefault("ServerTS.IP", "127.0.0.1")
	viper.SetDefault("ServerTS.PortServer", "9987")
	viper.SetDefault("ServerTS.PortQuery", "10011")
	viper.SetDefault("ServerWeb.Port", "80")
}

func (config *Config) overrideWithEnvironmentVars() {
	if nickname := os.Getenv("TS3_NICKNAME"); nickname != "" {
		config.User.Nickname = nickname
	}

	if username := os.Getenv("TS3_NAME"); username != "" {
		config.User.Name = username
	}

	if password := os.Getenv("TS3_PW"); password != "" {
		config.User.Password = password
	}

	if tsIP := os.Getenv("TS3_IP"); tsIP != "" {
		config.ServerTS.IP = tsIP
	}

	if tsPort, err := strconv.Atoi(os.Getenv("TS3_PORT")); tsPort <= 65535 && tsPort >= 0 && err == nil {
		config.ServerTS.PortServer = uint16(tsPort)
	}

	if tsQuery, err := strconv.Atoi(os.Getenv("TS3_QUERY")); tsQuery <= 65535 && tsQuery >= 0 && err == nil {
		config.ServerTS.PortQuery = uint16(tsQuery)
	}

	if webPort, err := strconv.Atoi(os.Getenv("WEB_PORT")); webPort <= 65535 && webPort >= 0 && err == nil {
		config.ServerWeb.Port = uint16(webPort)
	}
}