add auth middleware

middleware/auth.go

@@ -0,0 +1,41 @@
+package middleware
+
+import (
+	"context"
+	"go-weather/services"
+	"net/http"
+	"strings"
+)
+
+type contextKey string
+
+const ClaimsKey contextKey = "claims"
+
+func AuthMiddleware(authService *services.AuthService) func(http.Handler) http.Handler {
+	return func(next http.Handler) http.Handler {
+		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			authHeader := r.Header.Get("Authorization")
+			if authHeader == "" {
+				http.Error(w, "unauthorized", http.StatusUnauthorized)
+				return
+			}
+
+			tokenString := strings.TrimPrefix(authHeader, "Bearer ")
+			claims, err := authService.ValidateToken(tokenString)
+			if err != nil {
+				http.Error(w, "invalid token", http.StatusUnauthorized)
+				return
+			}
+
+			ctx := context.WithValue(r.Context(), ClaimsKey, claims)
+			next.ServeHTTP(w, r.WithContext(ctx))
+		})
+	}
+}
+
+func GetClaims(r *http.Request) *services.Claims {
+	if claims, ok := r.Context().Value(ClaimsKey).(*services.Claims); ok {
+		return claims
+	}
+	return nil
+}