~mendelmaleh/dummy

ref: 04d85b90f603a503a73404ef5e9c6a1d9c9f0f6a dummy/cmd/dummyserver/main.go -rw-r--r-- 3.3 KiB
04d85b90Mendel E Set connections limit in config 1 year, 2 months ago
                                                                                
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package main

import (
	"fmt"
	"html/template"
	"image/png"
	"io/ioutil"
	"log"
	"net"
	"net/http"
	"net/url"
	"path/filepath"
	"strings"

	"git.sr.ht/~mendelmaleh/dummy"
	"git.sr.ht/~mendelmaleh/freetype"
	"git.sr.ht/~mendelmaleh/freetype/truetype"
	"github.com/pelletier/go-toml"
	"golang.org/x/net/netutil"
)

type Config struct {
	Dummy struct {
		Conns                      int
		Addr, Pattern, Fonts, Font string
	}
}

var fonts = make(map[string]*truetype.Font)

func main() {
	doc, err := ioutil.ReadFile("config.toml")
	if err != nil {
		log.Fatal(err)
	}

	config := Config{}
	err = toml.Unmarshal(doc, &config)
	if err != nil {
		log.Fatal(err)
	}

	fontfiles, err := ioutil.ReadDir(config.Dummy.Fonts)
	if err != nil {
		log.Fatal(err)
	}

	for _, file := range fontfiles {
		if filepath.Ext(file.Name()) != ".ttf" {
			continue
		}

		filebytes, err := ioutil.ReadFile(config.Dummy.Fonts + file.Name())
		if err != nil {
			log.Println(err) // don't exit if one font doesn't work
			continue
		}

		font, err := freetype.ParseFont(filebytes)
		if err != nil {
			log.Println(err)
			continue
		}

		// fmt.Println(font.Name(truetype.NameIDFontFamily))
		fonts[font.Name(truetype.NameIDFontFamily)] = font
	}

	if len(fonts) < 1 {
		log.Fatal("No fonts loaded")
	}

	// set default font after it's loaded
	font, ok := fonts[config.Dummy.Font]
	if !ok {
		log.Fatal("Default font not found")
	}

	dopt := dummy.DefaultOptions
	dopt.Font = font

	tmpl := template.New("web").Funcs(template.FuncMap{"title": strings.Title})
	tmpl = template.Must(tmpl.Parse(`<!doctype html>
<html prefix="og: http://ogp.me/ns#">
<head>
  <title>{{ title .Name }}</title>
  <meta property="og:title" content="{{ title .Name }}" />
  <meta property="og:type" content="website" />
  <meta property="og:url" content={{ .Image }} />
  <meta property="og:image" content="{{ .Image }}" />
  <meta property="og:description" content="{{ .Desc }}" />
</head>`))

	http.HandleFunc(config.Dummy.Pattern,
		func(w http.ResponseWriter, r *http.Request) {
			Dummy(w, r, Options{dopt.Copy()})
		},
	)

	http.HandleFunc(config.Dummy.Pattern+"web/",
		func(w http.ResponseWriter, r *http.Request) {
			Web(w, r, Options{dopt.Copy()}, config, tmpl)
		},
	)

	listener, err := net.Listen("tcp", config.Dummy.Addr)
	if err != nil {
		log.Fatal(err)
	}

	listener = netutil.LimitListener(listener, config.Dummy.Conns)
	log.Panic(http.Serve(listener, nil))
}

func Dummy(w http.ResponseWriter, r *http.Request, opt Options) {
	err := r.ParseForm()
	if err != nil {
		fmt.Fprintln(w, err)
		return
	}

	err = opt.FromForm(r.Form)
	if err != nil {
		fmt.Fprintln(w, err)
		return
	}

	im := dummy.Image(opt.Options)
	png.Encode(w, im)

	// fmt.Fprintf(w, "%+v\n", dopt)
}

func Web(w http.ResponseWriter, r *http.Request, opt Options, config Config, tmpl *template.Template) {
	err := r.ParseForm()
	if err != nil {
		fmt.Fprintln(w, err)
		return
	}

	err = opt.FromForm(r.Form)
	if err != nil {
		fmt.Fprintln(w, err)
		return
	}

	u := url.URL{
		Host:     r.Host,
		RawQuery: r.URL.RawQuery,
		Path:     config.Dummy.Pattern,
	}

	if v, ok := r.Header["X-Forwarded-Proto"]; ok {
		u.Scheme = strings.Join(v, "")
	} else {
		u.Scheme = "http"
	}

	tmpl.Execute(w, struct {
		Name, Desc string
		Image      template.URL
	}{"Dummy", opt.Desc, template.URL(u.String())})

}