Use vendored go-swagger (#8087)

* Use vendored go-swagger

* vendor go-swagger

* revert un wanteed change

* remove un-needed GO111MODULE

* Update Makefile

Co-Authored-By: techknowlogick <matti@mdranta.net>

vendor/github.com/go-openapi/runtime/middleware/spec.go

@@ -0,0 +1,48 @@
+// Copyright 2015 go-swagger maintainers
+//
+// 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 middleware
+
+import (
+	"net/http"
+	"path"
+)
+
+// Spec creates a middleware to serve a swagger spec.
+// This allows for altering the spec before starting the http listener.
+// This can be useful if you want to serve the swagger spec from another path than /swagger.json
+//
+func Spec(basePath string, b []byte, next http.Handler) http.Handler {
+	if basePath == "" {
+		basePath = "/"
+	}
+	pth := path.Join(basePath, "swagger.json")
+
+	return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
+		if r.URL.Path == pth {
+			rw.Header().Set("Content-Type", "application/json")
+			rw.WriteHeader(http.StatusOK)
+			//#nosec
+			_, _ = rw.Write(b)
+			return
+		}
+
+		if next == nil {
+			rw.Header().Set("Content-Type", "application/json")
+			rw.WriteHeader(http.StatusNotFound)
+			return
+		}
+		next.ServeHTTP(rw, r)
+	})
+}