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token.go
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token.go
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package utils
import (
"errors"
"fmt"
"net/http"
"os"
"strings"
"github.com/dgrijalva/jwt-go"
"github.com/gin-gonic/gin"
)
func GetUserId(c *gin.Context) (int32, error) {
bearerToken := c.Request.Header.Get("Authorization")
tokenString := ""
if len(strings.Split(bearerToken, " ")) == 2 {
tokenString = strings.Split(bearerToken, " ")[1]
} else {
c.JSON(http.StatusBadRequest, gin.H{"error": "invalid token format"})
return 0, errors.New("invalid token")
}
tokenPure, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
return []byte(os.Getenv("secret_key")), nil
})
if err != nil {
return 0, err
}
if claims, ok := tokenPure.Claims.(jwt.MapClaims); ok && tokenPure.Valid {
userID, _ := claims["user_id"].(float64)
return int32(userID), nil
} else {
return 0, errors.New("invalid token")
}
}
func GetUserUsername(c *gin.Context) (string, error) {
bearerToken := c.Request.Header.Get("Authorization")
tokenString := ""
if len(strings.Split(bearerToken, " ")) == 2 {
tokenString = strings.Split(bearerToken, " ")[1]
} else {
c.JSON(http.StatusBadRequest, gin.H{"error": "invalid token format"})
return "", errors.New("invalid token")
}
tokenPure, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
return []byte(os.Getenv("secret_key")), nil
})
if err != nil {
return "", err
}
if claims, ok := tokenPure.Claims.(jwt.MapClaims); ok && tokenPure.Valid {
username, _ := claims["username"].(string)
return username, nil
} else {
return "", errors.New("invalid username")
}
}
func JwtAuthMiddleware() gin.HandlerFunc {
return func(c *gin.Context) {
err := TokenValid(c)
if err != nil {
c.AbortWithStatus(http.StatusUnauthorized)
return
}
c.Next()
}
}
func TokenValid(c *gin.Context) error {
tokenString, err := ExtractToken(c)
if err != nil {
return err
}
if tokenString == os.Getenv("ADM_TOKEN") {
return nil
}
if tokenString == "" {
return errors.New("no token given")
}
_, 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("secret_key")), nil
})
if err != nil {
return err
}
return nil
}
func ExtractToken(c *gin.Context) (string, error) {
token := c.Query("token")
if token != "" {
return token, nil
}
bearerToken := c.Request.Header.Get("Authorization")
if bearerToken == "" {
return "", errors.New("No Authorization header provided")
}
if len(strings.Split(bearerToken, " ")) == 2 {
return strings.Split(bearerToken, " ")[1], nil
}
return "", errors.New("Invalid Authorization header format")
}