feat: add load additional middleware from a defined directory

internal/middleware.go

@@ -2,6 +2,9 @@ package pkg
 
 import (
 	"errors"
+	"fmt"
+	"gopkg.in/yaml.v3"
+	"os"
 	"slices"
 	"strings"
 )
@@ -32,3 +35,45 @@ func GetMiddleware(rule string, middlewares []Middleware) (Middleware, error) {
 
 	return Middleware{}, errors.New("no middlewares found with name " + rule)
 }
+
+// loadExtraMiddlewares loads additional middlewares
+func loadExtraMiddlewares(routePath string) ([]Middleware, error) {
+	yamlFiles, err := loadExtraFiles(routePath)
+	if err != nil {
+		return nil, fmt.Errorf("error loading extra files: %v", err)
+	}
+	var extraMiddlewares []Middleware
+	for _, yamlFile := range yamlFiles {
+		buf, err := os.ReadFile(yamlFile)
+		if err != nil {
+			return nil, fmt.Errorf("error loading extra file: %v", err)
+		}
+		ex := &ExtraMiddleware{}
+		err = yaml.Unmarshal(buf, ex)
+		if err != nil {
+			return nil, fmt.Errorf("in file %q: %w", ConfigFile, err)
+		}
+		extraMiddlewares = append(extraMiddlewares, ex.Middlewares...)
+
+	}
+	if len(extraMiddlewares) == 0 {
+		return nil, fmt.Errorf("no extra middleware found")
+	}
+	return extraMiddlewares, nil
+}
+
+// findDuplicateMiddlewareNames finds duplicated middleware name
+func findDuplicateMiddlewareNames(middlewares []Middleware) []string {
+	// Create a map to track occurrences of names
+	nameMap := make(map[string]int)
+	var duplicates []string
+
+	for _, mid := range middlewares {
+		nameMap[mid.Name]++
+		// If the count is ==2, it's a duplicate
+		if nameMap[mid.Name] == 2 {
+			duplicates = append(duplicates, mid.Name)
+		}
+	}
+	return duplicates
+}