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main.go
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main.go
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package main
import (
"fmt"
"log"
"net/http"
"os"
"strconv"
"strings"
"time"
"github.com/dgrijalva/jwt-go"
"github.com/gin-gonic/gin"
"github.com/go-redis/redis/v7"
"github.com/twinj/uuid"
)
var (
router = gin.Default()
)
type User struct {
ID uint64 `json:"id"`
Username string `json:"username"`
Password string `json:"password"`
}
type TokenDetails struct {
AccessToken string
RefreshToken string
AccessUuid string
RefreshUuid string
AtExpires int64
RtExpires int64
}
type AccessDetails struct {
AccessUuid string
UserId uint64
}
type Todo struct {
UserId uint64 `json:"user_id"`
Title string `json:"title"`
}
// Sample user
var user = User{
ID: 1,
Username: "username",
Password: "password",
}
var redisClient *redis.Client
func init() {
dsn := os.Getenv("REDIS_DSN")
if len(dsn) == 0 {
dsn = "localhost:6379"
}
redisClient = redis.NewClient(&redis.Options{
Addr: dsn,
})
_, err := redisClient.Ping().Result()
if err != nil {
panic(err)
}
}
func main() {
router.POST("/login", Login)
router.POST("/todo", TokenAuthMiddleware(), CreateTodo)
log.Fatal(router.Run(":8001"))
}
func CreateToken(userId uint64) (*TokenDetails, error) {
td := &TokenDetails{}
td.AtExpires = time.Now().Add(time.Minute * 15).Unix()
td.AccessUuid = uuid.NewV4().String()
td.RtExpires = time.Now().Add(time.Hour * 24 * 7).Unix()
td.RefreshUuid = uuid.NewV4().String()
var err error
os.Setenv("ACCESS_SECRET", "1234567890")
atClaims := jwt.MapClaims{}
atClaims["authorized"] = true
atClaims["access_uuid"] = td.AccessUuid
atClaims["user_id"] = userId
atClaims["exp"] = td.AtExpires
at := jwt.NewWithClaims(jwt.SigningMethodHS256, atClaims)
td.AccessToken, err = at.SignedString([]byte(os.Getenv("ACCESS_SECRET")))
if err != nil {
return nil, err
}
os.Setenv("REFRESH_SECRET", "1234567890")
rtClaims := jwt.MapClaims{}
rtClaims["authorized"] = true
rtClaims["refresh_uuid"] = td.RefreshUuid
rtClaims["user_id"] = userId
rtClaims["exp"] = td.RtExpires
rt := jwt.NewWithClaims(jwt.SigningMethodHS256, rtClaims)
td.RefreshToken, err = rt.SignedString([]byte(os.Getenv("REFRESH_SECRET")))
if err != nil {
return nil, err
}
return td, nil
}
func CreateAuth(userId uint64, td *TokenDetails) error {
at := time.Unix(td.AtExpires, 0)
rt := time.Unix(td.RtExpires, 0)
now := time.Now()
errAccess := redisClient.Set(td.AccessUuid, strconv.Itoa(int(userId)), at.Sub(now)).Err()
if errAccess != nil {
return errAccess
}
errRefresh := redisClient.Set(td.RefreshUuid, strconv.Itoa(int(userId)), rt.Sub(now)).Err()
if errAccess != nil {
return errRefresh
}
return nil
}
func ExtractToken(r *http.Request) string {
bearToken := r.Header.Get("Authorization")
strArr := strings.Split(bearToken, " ")
if len(strArr) == 2 {
return strArr[1]
}
return ""
}
func VerifyToken(r *http.Request) (*jwt.Token, error) {
tokenString := ExtractToken(r)
token, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"])
}
return []byte(os.Getenv("ACCESS_SECRET")), nil
})
if err != nil {
return nil, err
}
return token, nil
}
func TokenValid(r *http.Request) error {
token, err := VerifyToken(r)
if err != nil {
return err
}
if _, ok := token.Claims.(jwt.MapClaims); !ok && !token.Valid {
return err
}
return nil
}
func ExtractTokenMetaData(r *http.Request) (*AccessDetails, error) {
token, err := VerifyToken(r)
if err != nil {
return nil, err
}
claims, ok := token.Claims.(jwt.MapClaims)
if ok && token.Valid {
accessUuid, ok := claims["access_uuid"].(string)
if !ok {
return nil, err
}
userId, err := strconv.ParseUint(fmt.Sprintf("%.f", claims["user_id"]), 10, 64)
if err != nil {
return nil, err
}
return &AccessDetails{
AccessUuid: accessUuid,
UserId: userId,
}, nil
}
return nil, err
}
func FetchAuth(authD *AccessDetails) (uint64, error) {
userid, err := redisClient.Get(authD.AccessUuid).Result()
if err != nil {
return 0, err
}
userID, _ := strconv.ParseUint(userid, 10, 64)
return userID, nil
}
func Login(c *gin.Context) {
var u User
if err := c.ShouldBindJSON(&u); err != nil {
c.JSON(http.StatusUnprocessableEntity, "Invalid json provided")
return
}
if user.Username != u.Username || user.Password != u.Password {
c.JSON(http.StatusUnauthorized, "Please provide valid login details")
return
}
ts, err := CreateToken(user.ID)
if err != nil {
c.JSON(http.StatusUnprocessableEntity, err.Error())
}
saveErr := CreateAuth(user.ID, ts)
if saveErr != nil {
c.JSON(http.StatusUnprocessableEntity, saveErr)
return
}
tokens := map[string]string{
"access_token": ts.AccessToken,
"refresh_token": ts.RefreshToken,
}
c.JSON(http.StatusOK, tokens)
}
func TokenAuthMiddleware() gin.HandlerFunc {
return func(c *gin.Context) {
err := TokenValid(c.Request)
if err != nil {
c.JSON(http.StatusUnauthorized, err.Error())
c.Abort()
return
}
c.Next()
}
}
func CreateTodo(c *gin.Context) {
var td Todo
if err := c.ShouldBindJSON(&td); err != nil {
c.JSON(http.StatusUnprocessableEntity, "Invalid json provided")
return
}
tokenAuth, err := ExtractTokenMetaData(c.Request)
if err != nil {
c.JSON(http.StatusUnauthorized, "unauthorized")
return
}
userId, err := FetchAuth(tokenAuth)
if err != nil {
c.JSON(http.StatusUnauthorized, "unauthorized")
return
}
td.UserId = userId
c.JSON(http.StatusCreated, td)
}