Merge pull request #13 from RomanSerikov/feature/variadic-param-middl…

…ewares

Changed Mixed() middleware to get variadic number of input mws

middleware.go

@@ -4,34 +4,39 @@ import (
 	echo "github.com/labstack/echo/v4"
 )
 
-// Mixed returns a single middleware function composed of the two middlewares.
+// Mixed returns a single middleware function composed of the middlewares.
 // Upon being called, it is internally going to call the first middleware, and if there
 // is no error, return immediately with the answer.
 //
-// Otherwise, it is going to call the second middleware, and return their response.
-func Mixed(preserveKeys []string) func(handler1, handler2 echo.MiddlewareFunc) echo.MiddlewareFunc {
-	return func(handler1, handler2 echo.MiddlewareFunc) echo.MiddlewareFunc {
+// Otherwise, it is going to call the next middlewares, and return their response.
+func Mixed(preserveKeys []string) func(handlers ...echo.MiddlewareFunc) echo.MiddlewareFunc {
+	return func(handlers ...echo.MiddlewareFunc) echo.MiddlewareFunc {
 		return func(next echo.HandlerFunc) echo.HandlerFunc {
-			a1 := handler1(next)
-			a2 := handler2(next)
+			var tempContext echo.Context
 
 			return func(c echo.Context) error {
-				tempContext := copyContext(c, preserveKeys)
-				defer tempContext.Echo().ReleaseContext(tempContext)
-				if a1(tempContext) == nil {
-					copyResponse(c, tempContext, preserveKeys)
+				var err error
+
+				for _, handler := range handlers {
+					tempContext = copyContext(c, preserveKeys)
+					defer tempContext.Echo().ReleaseContext(tempContext)
+
+					err = handler(next)(tempContext)
+					if err == nil {
+						copyResponse(c, tempContext, preserveKeys)
 
-					return nil
+						return nil
+					}
 				}
 
-				// Try the second middleware
-				err := a2(c)
 				if err != nil {
-					// Return the first middleware error
 					copyResponse(c, tempContext, preserveKeys)
 					c.Response().WriteHeader(tempContext.Response().Status)
+
+					return err
 				}
-				return err
+
+				return nil
 			}
 		}
 	}