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jwt.go
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jwt.go
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package auth
import (
"errors"
"fmt"
"os"
"strconv"
"strings"
"time"
"github.com/dgrijalva/jwt-go"
"github.com/gin-gonic/gin"
)
func CreateToken(userId string) (string, error) {
claims := jwt.MapClaims{}
// TODO: add more claims...
claims["sub"] = userId
claims["exp"] = time.Now().Add(time.Hour * 24).Unix()
token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
return token.SignedString([]byte(os.Getenv("API_KEY")))
}
func ParseToken(tokenString string) (*jwt.Token, error) {
return jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
if token.Method.Alg() != jwt.SigningMethodHS256.Name {
return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"])
}
return []byte(os.Getenv("API_KEY")), nil
})
}
func ExtractToken(c *gin.Context) string {
bearerToken := c.GetHeader("Authorization")
token := strings.Replace(bearerToken, "Bearer ", "", 1)
return token
}
func ExtractUserId(token *jwt.Token) (int, error) {
claims, ok := token.Claims.(jwt.MapClaims)
if !ok {
return 0, errors.New("failed to extract claims")
}
userIdStr, ok := claims["sub"].(string)
if !ok {
return 0, errors.New("failed to extract user ID")
}
userId, err := strconv.Atoi(userIdStr)
if err != nil {
return 0, errors.New("failed to convert user ID to int")
}
return userId, nil
}