add authAdminMiddlware into package auth. Need test it

api/src/rt/auth/authAdminMiddlware.go

@@ -0,0 +1,50 @@
+package auth
+
+import (
+	"api/src/models"
+	"context"
+	"net/http"
+
+	"github.com/golang-jwt/jwt/v4"
+)
+
+func AuthAdminMiddleware(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		c, err := r.Cookie("token")
+		if err != nil {
+			if err == http.ErrNoCookie {
+				w.WriteHeader(http.StatusUnauthorized)
+				return
+			}
+			w.WriteHeader(http.StatusBadRequest)
+			return
+		}
+
+		tknStr := c.Value
+		claims := &models.Claims{}
+
+		tkn, err := jwt.ParseWithClaims(tknStr, claims, func(token *jwt.Token) (interface{}, error) {
+			return jwtKey, nil
+		})
+
+		if err != nil {
+			if err == jwt.ErrSignatureInvalid {
+				w.WriteHeader(http.StatusUnauthorized)
+				return
+			}
+			w.WriteHeader(http.StatusBadRequest)
+			return
+		}
+		if !tkn.Valid {
+			w.WriteHeader(http.StatusUnauthorized)
+			return
+		}
+
+		if claims.Role != "Admin" {
+			w.WriteHeader(http.StatusNonAuthoritativeInfo)
+			return
+		}
+		ctx := context.WithValue(r.Context(), "email", claims.Email)
+		next.ServeHTTP(w, r.WithContext(ctx))
+	})
+}