add basic jwt auth

middlewares/requireAuth.go

@@ -0,0 +1,70 @@
+package middlewares
+
+import(
+	"os"
+	"fmt"
+	"time"
+	"net/http"
+	"github.com/gin-gonic/gin"
+	"github.com/golang-jwt/jwt/v5"
+	"gorm.io/gorm"
+
+	"example.com/gin/test/models"
+)
+
+type AuthValidator struct {
+	DB *gorm.DB
+}
+
+func (av *AuthValidator) RequireAuth(c *gin.Context) {
+	// Get Cookie
+	tokenString, err := c.Cookie("Authorization")
+
+	if err != nil {
+		c.AbortWithStatus(http.StatusUnauthorized)
+		return
+	}
+
+	//Validate
+	token, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
+		// Don't forget to validate the alg is what you expect:
+		if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
+			return nil, fmt.Errorf("Unexpected signing method: %v", token.Header["alg"])
+		}
+
+		// hmacSampleSecret is a []byte containing your secret, e.g. []byte("my_secret_key")
+		return []byte(os.Getenv("SECRET")), nil
+	})
+
+	if err != nil {
+		c.AbortWithStatus(http.StatusUnauthorized)
+		return
+	}
+	
+	if claims, ok := token.Claims.(jwt.MapClaims); ok {
+		//Check Expiration
+		if float64(time.Now().Unix()) > claims["exp"].(float64) {
+			//expired
+			c.AbortWithStatus(http.StatusUnauthorized)
+			return
+		}
+		
+		//Find user
+		var user models.User
+		result := av.DB.First(&user, claims["sub"])
+
+		if result.Error != nil {
+			c.AbortWithStatus(http.StatusUnauthorized)
+			return
+		}
+	
+		//Attach to req
+		c.Set("user", user)
+	
+		// Coninue
+		c.Next()
+		return
+	}
+	
+	c.AbortWithStatus(http.StatusUnauthorized)
+}