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util.go
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util.go
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package yuri
import (
"database/sql"
"encoding/json"
"errors"
"fmt"
"github.com/golang-jwt/jwt/v4"
"github.com/google/uuid"
"log"
"math/rand"
"net/http"
"reflect"
"regexp"
"strconv"
"strings"
"time"
"github.com/go-chi/chi"
"github.com/ttacon/libphonenumber"
"golang.org/x/crypto/bcrypt"
)
const charset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
var seededRand *rand.Rand = rand.New(rand.NewSource(time.Now().UnixNano()))
// IntStringOrFloatColumn /User may send data to a struct property
///as a string int or float,this will convert them to a string
///and save them to the database as a string (Var char)
//It will also make sure json does not complain
///that number int or float is not of type string
type IntStringOrFloatColumn struct {
sql.NullString
}
func (ni *IntStringOrFloatColumn) MarshalJSON() ([]byte, error) {
if !ni.Valid {
return json.Marshal(ni.String)
}
return json.Marshal(ni.String)
}
func (ni *IntStringOrFloatColumn) UnmarshalJSON(b []byte) error {
var item interface{}
if err := json.Unmarshal(b, &item); err != nil {
ni.Valid = false
return err
}
switch v := item.(type) {
case int:
ni.String = IntToString(v)
// v is an int here, so e.g. v + 1 is possible.
case float64:
ni.String = fmt.Sprintf("%.0f", v)
case string:
ni.String = v
default:
//fmt.Printf("%T\n", item)
///log.Println("unknwn type of is int", v)
// And here I'm feeling dumb. ;)
}
///err := json.Unmarshal(b, &ni.String)
///ni.Valid = err == nil
ni.Valid = true
return nil
}
const millisInSecond = 1000
const nsInSecond = 1000000
// MilliToTime FromUnixMilli Converts Unix Epoch from milliseconds to time.Time
func MilliToTime(ms int64) time.Time {
return time.Unix(ms/int64(millisInSecond), (ms%int64(millisInSecond))*int64(nsInSecond))
}
//check if a string can be converted into an integer
func StringIsInt(s string) (*int, bool) {
i, err := strconv.Atoi(s)
if err != nil {
return nil, false
}
return &i, true
}
func StringToInt(s string) (int, error) {
return strconv.Atoi(s)
}
func ExecutionTime(start time.Time, name string) {
elapsed := time.Since(start)
log.Printf("%s took %s", name, elapsed)
}
func IsEmpty(s string) bool {
if len(strings.TrimSpace(s)) == 0 {
return true
}
return false
}
func IntToString(item int) string {
return strconv.Itoa(item)
}
func EqualIgnoreCase(a, b string) bool {
return strings.EqualFold(a, b)
}
func JengaTime(t time.Time) string {
layout := "2006-01-02"
///t := time.Now()
formatted := t.Format(layout)
return formatted
}
func MakePin(min, max, n int) string {
var pin []string
for i := 1; i <= n; i++ {
pin = append(pin, strconv.Itoa(random(min, max)))
}
return strings.Join(pin, "")
}
func MakeIntPin(min, max, n int) int {
data, _ := strconv.Atoi(MakePin(min, max, n))
return data
}
func CheckTokenId(r *http.Request, JwtSecretKey []byte) (int, error) {
authHeader := r.Header.Get("Authorization")
if authHeader == "" {
return 0, errors.New("authorized")
}
splitToken := strings.Split(authHeader, "Bearer")
authHeader = splitToken[1]
sentToken := strings.TrimSpace(authHeader)
if sentToken == "" {
return 0, errors.New("authorized")
}
userId, err := ValidateToken(sentToken, JwtSecretKey)
if err != nil {
return 0, errors.New("unauthorized")
}
return userId, nil
}
func ValidateToken(tok string, JwtSecretKey []byte) (int, error) {
var userId int
token, err := jwt.Parse(tok, func(token *jwt.Token) (interface{}, error) {
if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
return nil, fmt.Errorf("There was an error")
}
return JwtSecretKey, nil
})
if claims, ok := token.Claims.(jwt.MapClaims); ok && token.Valid {
userId := int(claims["user_id"].(float64)) //.(uint)
return userId, err
} else {
err = new("Wrong User Credentials sent")
return userId, err
}
}
func CreateToken(claims jwt.MapClaims, JwtSecretKey []byte) string {
token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
tokenString, err := token.SignedString(JwtSecretKey)
if err != nil {
}
return tokenString
}
type WrongTokenCredential struct {
s string
}
func (e *WrongTokenCredential) Error() string {
return e.s
}
func new(text string) error {
return &WrongTokenCredential{text}
}
func random(min, max int) int {
//rand.Seed(time.Now().Unix())
rand.Seed(time.Now().UnixNano())
return rand.Intn(max-min) + min
}
func makeHashId() {
}
func ExtractIntUrlParams(field string, r *http.Request) int {
i, _ := strconv.Atoi(chi.URLParam(r, field))
return i
}
func ExtractStringUrlParams(field string, r *http.Request) string {
i := chi.URLParam(r, field)
return i
}
func HashPassword(password string) (string, error) {
bytes, err := bcrypt.GenerateFromPassword([]byte(password), 8)
return string(bytes), err
}
func CheckPasswordHash(password, hash string) bool {
err := bcrypt.CompareHashAndPassword([]byte(hash), []byte(password))
if err != nil {
return false
}
return true
}
func PrintStruct(data interface{}) {
fmt.Printf("%+v\n", data)
}
func MakeTimestamp() int64 {
t := time.Now()
tUnixMilli := int64(time.Nanosecond) * t.UnixNano() / int64(time.Millisecond)
return tUnixMilli
}
func InterfaceToStruct(input interface{}, outputStruct interface{}) error {
if reflect.ValueOf(outputStruct).Kind() != reflect.Ptr {
return errors.New("output must be a pointer")
}
toJson, err := ToJson(input)
if err != nil {
return err
}
err = json.Unmarshal(toJson, outputStruct)
return err
}
func InterfaceToString(input interface{}) string {
str := fmt.Sprintf("%v", input)
return str
}
func StructToMap(input interface{}) (map[string]interface{}, error) {
if reflect.ValueOf(input).Kind() != reflect.Ptr {
return nil, errors.New("input must be a pointer")
}
var myInterface map[string]interface{}
toJson, err := ToJson(input)
if err != nil {
return nil, err
}
err = json.Unmarshal(toJson, &myInterface)
return myInterface, err
}
func ToString(data interface{}) (string, error) {
b, err := json.Marshal(data)
if err != nil {
return "", err
}
return string(b), nil
}
func ToJson(data interface{}) ([]byte, error) {
b, err := json.Marshal(data)
if err != nil {
return nil, err
}
return b, nil
}
///TODO::make sure numbers dont pass 9
func checkKenyaInternationalPhoneNumber(phone string) bool {
re := regexp.MustCompile(`(^\+254)\d{9}$`)
return re.MatchString(phone)
}
func FormatNumberToInternationalFormat(phoneNumber, region string) (string, error) {
num, err := libphonenumber.Parse(phoneNumber, region)
if err != nil {
return "", err
}
formatted := libphonenumber.Format(num, libphonenumber.E164)
return formatted, nil
}
func FormatNumberToNationalFormat(phoneNumber, region string) (string, error) {
num, err := libphonenumber.Parse(phoneNumber, region)
if err != nil {
return "", err
}
formatted := libphonenumber.Format(num, libphonenumber.NATIONAL)
trimmed := strings.Replace(formatted, " ", "", -1)
return trimmed, nil
}
func CreateGid() string {
u2 := uuid.New()
return u2.String()
}
func ContainsInt(items []int, item int) bool {
for _, number := range items {
if number == item {
return true
}
}
return false
}
func ContainsString(s []string, e string) bool {
for _, a := range s {
if a == e {
return true
}
}
return false
}
func CreateRandomString(length int) string {
b := make([]byte, length)
for i := range b {
b[i] = charset[seededRand.Intn(len(charset))]
}
return string(b)
}