Add webui to binary package

webui/webui.go

@@ -0,0 +1,58 @@
+//go:build withUI
+// +build withUI
+
+package webui
+
+//go:generate yarn
+//go:generate yarn build
+
+import (
+	"embed"
+	"io/fs"
+	"log"
+	"net/http"
+	"path"
+	"strings"
+)
+
+//go:embed build/*
+var content embed.FS
+
+func ServeUI() (http.Handler, error) {
+	fSys, err := fs.Sub(content, "build")
+	if err != nil {
+		return nil, err
+	}
+
+	staticServer := http.FileServer(http.FS(fSys))
+
+	serveIndex, err := ServeIndex()
+	if err != nil {
+		return nil, err
+	}
+
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		_, err := fSys.Open(strings.TrimPrefix(path.Clean(r.URL.Path), "/"))
+		if err != nil {
+			log.Println(err)
+			serveIndex.ServeHTTP(w, r)
+			return
+		}
+		log.Println("serving static")
+		staticServer.ServeHTTP(w, r)
+	}), nil
+}
+
+func ServeIndex() (http.HandlerFunc, error) {
+	indexFile, err := content.ReadFile("build/index.html")
+	if err != nil {
+		return nil, err
+	}
+
+	return func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "text/html")
+
+		w.WriteHeader(200)
+		w.Write(indexFile)
+	}, nil
+}