polycule-connect/polyculeconnect/controller/ui/static.go

package ui

import (
	"bytes"
	"fmt"
	"html/template"
	"io"
	"net/http"
	"path/filepath"

	"git.faercol.me/faercol/polyculeconnect/polyculeconnect/helpers"
	"github.com/sirupsen/logrus"
)

const StaticRoute = "/static/"

type StaticController struct {
}

func (sc *StaticController) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	fs := http.FileServer(http.Dir("./static"))
	http.StripPrefix(StaticRoute, fs).ServeHTTP(w, r)
}

type IndexController struct {
	l                     *logrus.Logger
	downstreamConstroller http.Handler
}

func NewIndexController(l *logrus.Logger, downstream http.Handler) *IndexController {
	return &IndexController{
		l:                     l,
		downstreamConstroller: downstream,
	}
}

func (ic IndexController) serveUI(w http.ResponseWriter, r *http.Request) (int, int, error) {
	lp := filepath.Join("templates", "index.html")
	tmpl, err := template.ParseFiles(lp)
	if err != nil {
		return http.StatusInternalServerError, -1, fmt.Errorf("failed to init template: %w", err)
	}
	buf := new(bytes.Buffer)

	if err := tmpl.Execute(buf, nil); err != nil {
		return http.StatusInternalServerError, -1, fmt.Errorf("failed to execute template: %w", err)
	}
	n, err := io.Copy(w, buf)
	if err != nil {
		return http.StatusInternalServerError, int(n), fmt.Errorf("failed to write response; %w", err)
	}

	return http.StatusOK, int(n), nil
}

func (ic *IndexController) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	if r.RequestURI != "/" {
		ic.downstreamConstroller.ServeHTTP(w, r)
		return
	}
	returncode, contentLength, err := ic.serveUI(w, r)
	if err != nil {
		ic.l.Errorf("Error serving UI: %s", err.Error())
		helpers.HandleResponse(w, r, returncode, nil, ic.l)
	} else {
		helpers.AddToContext(r, returncode, contentLength)
	}
}