Move packages to proejct/pkg to follow go project folder structure convention (#1190)

pkg/controller/workflowApiProxy.go

@@ -0,0 +1,32 @@
+package controller
+
+import (
+	"fmt"
+	"net/http"
+	"net/http/httputil"
+	"net/url"
+
+	"github.com/gorilla/mux"
+)
+
+func (api *API) WorkflowApiserverProxy(w http.ResponseWriter, r *http.Request) {
+	u := api.workflowApiUrl
+	ssUrl, err := url.Parse(u)
+	if err != nil {
+		msg := fmt.Sprintf("Error parsing url %v: %v", u, err)
+		http.Error(w, msg, http.StatusInternalServerError)
+		return
+	}
+
+	vars := mux.Vars(r)
+	path := fmt.Sprintf("/%s", vars["path"])
+	director := func(req *http.Request) {
+		req.URL.Scheme = ssUrl.Scheme
+		req.URL.Host = ssUrl.Host
+		req.URL.Path = path
+	}
+	proxy := &httputil.ReverseProxy{
+		Director: director,
+	}
+	proxy.ServeHTTP(w, r)
+}