Add middleware options

Author: Nesze

middleware.go

@@ -2,13 +2,56 @@ package castle
 
 import "net/http"
 
+type middlewareOpts struct {
+	methodFilter string
+	pathFilter   string
+	ignoreEmpty  bool
+}
+
+type MiddlewareOpt func(*middlewareOpts)
+
+func WithMethodFilter(method string) MiddlewareOpt {
+	return func(o *middlewareOpts) {
+		o.methodFilter = method
+	}
+}
+
+func WithPathFilter(path string) MiddlewareOpt {
+	return func(o *middlewareOpts) {
+		o.pathFilter = path
+	}
+}
+
+func WithIgnoreEmpty(ignore bool) MiddlewareOpt {
+	return func(o *middlewareOpts) {
+		o.ignoreEmpty = ignore
+	}
+}
+
 // Middleware is a function that wraps an http.Handler to inject the Castle context into the request.
 // If ignoreEmpty is true, it will skip the middleware if the request token is empty.
-func Middleware(ignoreEmpty bool) func(next http.Handler) http.Handler {
+func Middleware(opts ...MiddlewareOpt) func(next http.Handler) http.Handler {
+	options := &middlewareOpts{
+		methodFilter: "POST",
+		ignoreEmpty:  true,
+	}
+
+	for _, opt := range opts {
+		opt(options)
+	}
+
 	return func(next http.Handler) http.Handler {
 		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			if options.methodFilter != "" && r.Method != options.methodFilter {
+				next.ServeHTTP(w, r)
+				return
+			}
+			if options.pathFilter != "" && r.URL.Path != options.pathFilter {
+				next.ServeHTTP(w, r)
+				return
+			}
 			castleCtx := FromHTTPRequest(r)
-			if ignoreEmpty && castleCtx.RequestToken == "" {
+			if options.ignoreEmpty && castleCtx.RequestToken == "" {
 				next.ServeHTTP(w, r)
 				return
 			}

middleware_test.go

@@ -8,7 +8,7 @@ import (
 
 func Test_Middleware(t *testing.T) {
 	t.Run("ctx is set", func(t *testing.T) {
-		middleware := Middleware(false)(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		middleware := Middleware()(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 			castleCtx := FromCtx(r.Context())
 			if castleCtx == nil {
 				t.Error("Expected castle context to be present in request context")
@@ -31,7 +31,7 @@ func Test_Middleware(t *testing.T) {
 		}
 	})
 	t.Run("ctx is not set", func(t *testing.T) {
-		middleware := Middleware(true)(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		middleware := Middleware()(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 			castleCtx := FromCtx(r.Context())
 			if castleCtx != nil {
 				t.Error("Expected castle context to not be present in request context")