log envconfig replacing sensitive values with stars

config-log.go

package main

import (
	"fmt"
	"log"
	"reflect"
	"strings"

	"github.com/kelseyhightower/envconfig"
)

type envConfig struct {
	SDLC   string `envconfig:"SDLC" default:"local"`
	DBHost string `envconfig:"DB_HOST" default:"localhost"`
	DBPort string `envconfig:"DB_PORT" default:"5432"`
}

func (e *envConfig) String() string {
	outStr := ""
	v := reflect.ValueOf(*e)
	for i := 0; i < v.NumField(); i++ {
		name := fmt.Sprintf("%v", v.Type().Field(i).Name)
		value := fmt.Sprintf("%v", v.Field(i).Interface())

		if strings.Contains(name, "Secret") || strings.Contains(name, "Password") || strings.Contains(name, "Key") {
			value = strings.Repeat("*", len(value))
		}
		outStr = outStr + fmt.Sprintf("%s:%s, ", name, value)
	}

	return outStr
}

func main() {
	var envVar envConfig
	err := envconfig.Process("CM", &envVar)
	if err != nil {
		log.Fatalf("Error parsing environment: %v", err)
	}
	log.Println(envVar.String())
}