dashboard: add the ability to use a remote dashboard, serve only local files: assets and eventualy public.json (to override given ones)

dashboard/fwd.go

@@ -0,0 +1,50 @@
+package main
+
+import (
+	"io"
+	"net/http"
+	"net/url"
+	"os"
+	"path"
+)
+
+func fwd_request(w http.ResponseWriter, r *http.Request, fwd string) {
+	if u, err := url.Parse(fwd); err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+	} else {
+		var user, pass string
+		if u.User != nil {
+			user = u.User.Username()
+			pass, _ = u.User.Password()
+			u.User = nil
+		}
+		if v, exists := os.LookupEnv("FICCLOUD_USER"); exists {
+			user = v
+		} else if v, exists := os.LookupEnv("FICCLOUD_PASS"); exists {
+			pass = v
+		}
+
+		u.Path = path.Join(u.Path, r.URL.Path)
+
+		if r, err := http.NewRequest(r.Method, u.String(), r.Body); err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+		} else {
+			if len(user) != 0 || len(pass) != 0 {
+				r.SetBasicAuth(user, pass)
+			}
+
+			if resp, err := http.DefaultClient.Do(r); err != nil {
+				http.Error(w, err.Error(), http.StatusBadGateway)
+			} else {
+				defer resp.Body.Close()
+
+				for key := range resp.Header {
+					w.Header().Add(key, resp.Header.Get(key))
+				}
+				w.WriteHeader(resp.StatusCode)
+
+				io.Copy(w, resp.Body)
+			}
+		}
+	}
+}