backend moved to separate directory

backend: deleted the old structure

go-backend/internal/middlewares/api.go

@@ -0,0 +1,31 @@
+package middlewares
+
+import (
+	"crypto/subtle"
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+
+	"GoMembership/internal/config"
+)
+
+func APIKeyMiddleware() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		clientAPIKey := c.GetHeader("X-API-Key")
+
+		if clientAPIKey == "" {
+			c.JSON(http.StatusUnauthorized, gin.H{"error": "API key is missing"})
+			c.Abort()
+			return
+		}
+
+		// Using subtle.ConstantTimeCompare to mitigate timing attacks
+		if subtle.ConstantTimeCompare([]byte(clientAPIKey), []byte(config.Auth.APIKEY)) != 1 {
+			c.JSON(http.StatusUnauthorized, gin.H{"error": "Invalid API key"})
+			c.Abort()
+			return
+		}
+
+		c.Next()
+	}
+}