Move middlewares to web/middleware (#14480)

Co-authored-by: 6543 <6543@obermui.de>

modules/web/middleware/request.go

@@ -0,0 +1,20 @@
+// Copyright 2020 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package middleware
+
+import (
+	"net/http"
+	"strings"
+)
+
+// IsAPIPath returns true if the specified URL is an API path
+func IsAPIPath(req *http.Request) bool {
+	return strings.HasPrefix(req.URL.Path, "/api/")
+}
+
+// IsInternalPath returns true if the specified URL is an internal API path
+func IsInternalPath(req *http.Request) bool {
+	return strings.HasPrefix(req.URL.Path, "/api/internal/")
+}