chore: refactroing of code

Commenting code for enhancing readability

internal/middlewares/block_common_exploits.go

@@ -0,0 +1,66 @@
+/*
+ * Copyright 2024 Jonas Kaninda
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package middlewares
+
+import (
+	"fmt"
+	"github.com/jkaninda/goma-gateway/pkg/logger"
+	"net/http"
+	"regexp"
+)
+
+// BlockExploitsMiddleware Middleware to block common exploits
+func BlockExploitsMiddleware(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		// Patterns to detect SQL injection attempts
+		sqlInjectionPattern := regexp.MustCompile(sqlPatterns)
+
+		// Pattern to detect path traversal attempts
+		pathTraversalPattern := regexp.MustCompile(traversalPatterns)
+
+		// Pattern to detect simple XSS attempts
+		xssPattern := regexp.MustCompile(xssPatterns)
+
+		// Check query strings
+		if sqlInjectionPattern.MatchString(r.URL.RawQuery) ||
+			pathTraversalPattern.MatchString(r.URL.Path) ||
+			xssPattern.MatchString(r.URL.RawQuery) {
+			logger.Error("%s: %s Forbidden - Potential exploit detected", getRealIP(r), r.URL.Path)
+			RespondWithError(w, http.StatusForbidden, fmt.Sprintf("%d Forbidden", http.StatusForbidden))
+			return
+
+		}
+		// Check form data (for POST requests)
+		if r.Method == http.MethodPost {
+			if err := r.ParseForm(); err == nil {
+				for _, values := range r.Form {
+					for _, value := range values {
+						if sqlInjectionPattern.MatchString(value) || xssPattern.MatchString(value) {
+							logger.Error("%s: %s %s Forbidden - Potential exploit detected", getRealIP(r), r.Method, r.URL.Path)
+							RespondWithError(w, http.StatusForbidden, fmt.Sprintf("%d Forbidden", http.StatusForbidden))
+							return
+						}
+					}
+				}
+			}
+		}
+
+		// Pass to the next handler if no exploit patterns were detected
+		next.ServeHTTP(w, r)
+	})
+}