package main
import (
"flag"
"fmt"
"image"
"image/color"
"image/png"
"log"
"net"
"net/http"
"strconv"
"amadan.net/rastrillo/aviso"
"amadan.net/rastrillo/pwa"
)
func main() {
addr := flag.String("addr", "127.0.0.1:8080", "listen address")
flag.Parse()
mux := http.NewServeMux()
manifest, err := (pwa.Manifest{ID: "/", Name: "PWA Example", StartURL: "/", Scope: "/",
ThemeColor: "#234d45", BackgroundColor: "#ffffff",
Icons: []pwa.Icon{
{Src: "/icon/192", Sizes: "192x192", Type: "image/png"},
{Src: "/icon/512", Sizes: "512x512", Type: "image/png"},
},
}).Handler()
if err != nil {
log.Fatal(err)
}
mux.Handle("/manifest.webmanifest", manifest)
mux.Handle("/pwa/", http.StripPrefix("/pwa", pwa.Assets()))
mux.HandleFunc("GET /aviso-sw.js", func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/javascript")
w.Header().Set("Cache-Control", "no-cache")
_, _ = w.Write(aviso.WorkerJS())
})
mux.HandleFunc("GET /sw.js", func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/javascript")
w.Header().Set("Cache-Control", "no-cache")
fmt.Fprint(w, `importScripts("/pwa/worker.js", "/aviso-sw.js");
RastrilloPWA.install();
self.addEventListener("push", e => e.waitUntil(AvisoSW.handlePush(e, {
fallback: () => ({title: "New activity", options: {data: {url: "/"}}})
})));
self.addEventListener("notificationclick", e => e.waitUntil(AvisoSW.handleClick(e, {fallbackURL: "/"})));
`)
})
mux.HandleFunc("GET /icon/{size}", func(w http.ResponseWriter, r *http.Request) {
size, _ := strconv.Atoi(r.PathValue("size"))
if size != 180 && size != 192 && size != 512 {
http.NotFound(w, r)
return
}
im := image.NewRGBA(image.Rect(0, 0, size, size))
for y := 0; y < size; y++ {
for x := 0; x < size; x++ {
im.Set(x, y, color.RGBA{35, 77, 69, 255})
}
}
w.Header().Set("Content-Type", "image/png")
_ = png.Encode(w, im)
})
mux.HandleFunc("GET /{$}", func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/html; charset=utf-8")
w.Header().Set("Cache-Control", "no-store")
fmt.Fprint(w, `
PWA Example
PWA Example
Add this app to your Home Screen or use your browser's install option.
Open it once online. Then disconnect and reload to see the offline page.
An update is ready. Save your work in all tabs, then close and reopen the app.
`)
})
listener, err := net.Listen("tcp", *addr)
if err != nil {
log.Fatal(err)
}
fmt.Printf("http://%s\n", listener.Addr())
log.Fatal(http.Serve(listener, mux))
}