utils.go

package utils

import (
	"bytes"
	emailverifier "github.com/AfterShip/email-verifier"
	normalizer "github.com/dimuska139/go-email-normalizer/v2"
	"github.com/jinzhu/now"
	"github.com/mohae/deepcopy"
	"gitlab.bob.co.za/bob-public-utils/bobgroup-go-utils/errors"
	"gitlab.bob.co.za/bob-public-utils/bobgroup-go-utils/string_utils"
	"math"
	"net"
	"net/url"
	"os"
	"reflect"
	"regexp"
	"strings"
	"time"
)

// GetEnv is a helper function for getting environment variables with a default
func GetEnv(name string, def string) (env string) {
	// If variable not set, provide default
	if env = os.Getenv(name); env == "" {
		env = def
	}
	return
}

// CorsHeaders returns a map to allow Cors
func CorsHeaders() map[string]string {
	return map[string]string{
		"Access-Control-Allow-Origin": "*",
		// do not wildcard: https://stackoverflow.com/questions/13146892/cors-access-control-allow-headers-wildcard-being-ignored
		"Access-Control-Allow-Headers":     "authorization, content-type, referer, sec-ch-ua, sec-ch-ua-mobile, sec-ch-ua-platform, user-agent, x-amz-date, x-amz-security-token",
		"Access-Control-Allow-Methods":     "OPTIONS,GET,PUT,POST,DELETE,PATCH,HEAD",
		"Access-Control-Max-Age":           "86400",
		"Access-Control-Allow-Credentials": "true",
	}
}

func DeepCopy(fromValue interface{}) (toValue interface{}) {
	return deepcopy.Copy(fromValue)
}

func Clone[T any](fromValue T) (toValue T) {
	return deepcopy.Copy(fromValue).(T)
}

func ValueToPointer[V any](value V) *V {
	return &value
}

func PointerToValue[V any](value *V) V {
	if value != nil {
		return *value
	}

	return *new(V) // zero value of V
}

func ValidateEmailAddress(email string, options ...map[string]string) (string, error) {
	// To lower
	cleanedEmail := strings.ToLower(strings.TrimSpace(email))

	// Remove all whitespaces
	cleanedEmail = string_utils.RemoveAllWhiteSpaces(cleanedEmail)

	// Also remove unofficial whitespaces
	for _, char := range string_utils.NonOfficialWhitespaceChars {