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package main
import (
"cmp"
"context"
"errors"
"flag"
"fmt"
"log"
"math"
"net/http"
"os"
"path/filepath"
"slices"
"strconv"
"strings"
"git.thomasvoss.com/euro-cash.eu/lib"
"git.thomasvoss.com/euro-cash.eu/lib/email"
"git.thomasvoss.com/euro-cash.eu/lib/mintage"
"git.thomasvoss.com/euro-cash.eu/template"
"github.com/a-h/templ"
)
var emailDisabled bool
var components = map[string]templ.Component{
"/": template.Root(),
"/about": template.About(),
"/coins": template.Coins(),
"/coins/designs": template.CoinsDesigns(),
"/coins/designs/nl": template.CoinsDesignsNl(),
"/coins/mintages": template.CoinsMintages(),
"/language": template.Language(),
}
func main() {
lib.InitPrinters()
port := flag.Int("port", 8080, "port number")
flag.BoolVar(&emailDisabled, "no-email", false,
"disables email support")
flag.StringVar(&email.Config.Host, "smtp-host", "smtp.migadu.com",
"SMTP server hostname")
flag.IntVar(&email.Config.Port, "smtp-port", 465,
"SMTP server port number")
flag.StringVar(&email.Config.ToAddr, "email-to", "bugs@euro-cash.eu",
"address to send error messages to")
flag.StringVar(&email.Config.FromAddr, "email-from", "noreply@euro-cash.eu",
"address to send error messages from")
flag.StringVar(&email.Config.Password, "email-password", "",
"password to authenticate the email client")
flag.Parse()
fs := http.FileServer(http.Dir("static"))
mux := http.NewServeMux()
mux.Handle("GET /designs/", fs)
mux.Handle("GET /favicon.ico", fs)
mux.Handle("GET /fonts/", fs)
mux.Handle("GET /style.css", fs)
mux.Handle("GET /coins/mintages", i18nHandler(mintageHandler(http.HandlerFunc(finalHandler))))
mux.Handle("GET /", i18nHandler(http.HandlerFunc(finalHandler)))
mux.Handle("POST /language", http.HandlerFunc(setUserLanguage))
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").(lib.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)
/* TODO: Create a 404 page */
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(), "/"),
})
}
template.Base(c).Render(r.Context(), w)
}
}
func i18nHandler(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
var p, pZero lib.Printer
if c, err := r.Cookie("locale"); err == nil {
p = lib.Printers[strings.ToLower(c.Value)]
}
ctx := context.WithValue(
r.Context(), "printer", cmp.Or(p, lib.DefaultPrinter))
if p == pZero {
http.SetCookie(w, &http.Cookie{
Name: "redirect",
Value: r.URL.Path,
})
template.Base(template.Language()).Render(ctx, w)
} else {
next.ServeHTTP(w, r.WithContext(ctx))
}
})
}
func mintageHandler(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
countries := lib.SortedCountries(
r.Context().Value("printer").(lib.Printer))
code := strings.ToLower(r.FormValue("code"))
if !slices.ContainsFunc(countries, func(c lib.Country) bool {
return c.Code == code
}) {
code = countries[0].Code
}
ctype := strings.ToLower(r.FormValue("type"))
switch ctype {
case "circ", "nifc", "proof":
default:
ctype = "circ"
}
path := filepath.Join("data", "mintages", code)
f, err := os.Open(path)
if err != nil {
throwError(http.StatusInternalServerError, err, w, r)
return
}
defer f.Close()
data, err := mintage.Parse(f, path)
if err != nil {
throwError(http.StatusInternalServerError, err, w, r)
return
}
ctx := context.WithValue(r.Context(), "code", code)
ctx = context.WithValue(ctx, "type", ctype)
ctx = context.WithValue(ctx, "mintages", data)
ctx = context.WithValue(ctx, "countries", countries)
next.ServeHTTP(w, r.WithContext(ctx))
})
}
func setUserLanguage(w http.ResponseWriter, r *http.Request) {
loc := r.FormValue("locale")
_, ok := lib.Printers[strings.ToLower(loc)]
if !ok {
w.WriteHeader(http.StatusUnprocessableEntity)
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 throwError(status int, err error, w http.ResponseWriter, r *http.Request) {
w.WriteHeader(status)
if emailDisabled {
log.Print(err)
} else {
go func() {
if err := email.ServerError(err); err != nil {
log.Print(err)
}
}()
}
template.Base(template.Error(status)).Render(r.Context(), w)
}
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