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package main
import (
"cmp"
"errors"
"flag"
"fmt"
"log"
"math"
"net/http"
"strconv"
"strings"
"git.thomasvoss.com/euro-cash.eu/i18n"
"git.thomasvoss.com/euro-cash.eu/middleware"
"git.thomasvoss.com/euro-cash.eu/templates"
"github.com/a-h/templ"
)
var components = map[string]templ.Component{
"/": templates.Index(),
"/about": templates.About(),
"/language": templates.SetLanguage(),
}
func main() {
i18n.InitPrinters()
port := flag.Int("port", 8080, "port number")
flag.Parse()
fs := http.FileServer(http.Dir("static"))
mux := http.NewServeMux()
mux.Handle("GET /favicon.ico", fs)
mux.Handle("GET /style.css", fs)
mux.Handle("GET /", middleware.Pipe(
middleware.I18n,
middleware.Theme,
)(http.HandlerFunc(finalHandler)))
mux.Handle("POST /language", http.HandlerFunc(setUserLanguage))
mux.Handle("POST /theme", http.HandlerFunc(setUserTheme))
portStr := ":" + strconv.Itoa(*port)
log.Println("Listening on", portStr)
log.Fatal(http.ListenAndServe(portStr, mux))
}
func finalHandler(w http.ResponseWriter, r *http.Request) {
p := r.Context().Value("printer").(i18n.Printer)
/* Strip trailing slash from the URL */
path := r.URL.Path
if path != "/" && path[len(path)-1] == '/' {
path = path[:len(path)-1]
}
if c, ok := components[path]; !ok {
w.WriteHeader(http.StatusNotFound)
fmt.Fprintln(w, p.T("Page not found"))
} else {
/* When a user clicks on the language button to be taken to the
language selection page, we need to set a redirect cookie so
that after selecting a language they are taken back to the
original page they came from. */
if path == "/language" {
http.SetCookie(w, &http.Cookie{
Name: "redirect",
Value: cmp.Or(r.Referer(), "/"),
})
}
templates.Root(nil, c).Render(r.Context(), w)
}
}
func setUserLanguage(w http.ResponseWriter, r *http.Request) {
loc := r.FormValue("locale")
_, ok := i18n.Printers[strings.ToLower(loc)]
if !ok {
w.WriteHeader(http.StatusBadRequest)
fmt.Fprintf(w, "Locale ‘%s’ is invalid or unsupported", loc)
return
}
http.SetCookie(w, &http.Cookie{
Name: "locale",
Value: loc,
MaxAge: math.MaxInt32,
})
if c, err := r.Cookie("redirect"); errors.Is(err, http.ErrNoCookie) {
http.Redirect(w, r, "/", http.StatusFound)
} else {
http.SetCookie(w, &http.Cookie{
Name: "redirect",
MaxAge: -1,
})
http.Redirect(w, r, c.Value, http.StatusFound)
}
}
func setUserTheme(w http.ResponseWriter, r *http.Request) {
c, err := r.Cookie("theme")
if errors.Is(err, http.ErrNoCookie) {
w.WriteHeader(http.StatusBadRequest)
fmt.Fprintf(w, "No ‘theme’ cookie exists")
return
}
var theme string
switch c.Value {
case "dark":
theme = "light"
case "light":
theme = "dark"
default:
w.WriteHeader(http.StatusBadRequest)
fmt.Fprintf(w, "Theme ‘%s’ is invalid", c.Value)
return
}
http.SetCookie(w, &http.Cookie{
Name: "theme",
Value: theme,
MaxAge: math.MaxInt32,
})
http.Redirect(w, r, r.Referer(), http.StatusFound)
}
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