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package src
import (
"cmp"
"context"
"errors"
"fmt"
"log"
"math"
"net/http"
"os"
"path/filepath"
"slices"
"strconv"
"strings"
"git.thomasvoss.com/euro-cash.eu/src/email"
"git.thomasvoss.com/euro-cash.eu/src/mintage"
)
type middleware = func(http.Handler) http.Handler
func Run(port int) {
fs := http.FileServer(http.Dir("static"))
final := http.HandlerFunc(finalHandler)
mux := http.NewServeMux()
mux.Handle("GET /designs/", fs)
mux.Handle("GET /favicon.ico", fs)
mux.Handle("GET /fonts/", fs)
mux.Handle("GET /style.min.css", fs)
mux.Handle("GET /coins/mintages", chain(
firstHandler,
i18nHandler,
mintageHandler,
)(final))
mux.Handle("GET /", chain(
firstHandler,
i18nHandler,
)(final))
mux.Handle("POST /language", http.HandlerFunc(setUserLanguage))
portStr := ":" + strconv.Itoa(port)
log.Println("Listening on", portStr)
log.Fatal(http.ListenAndServe(portStr, mux))
}
func chain(xs ...middleware) middleware {
return func(next http.Handler) http.Handler {
for i := len(xs) - 1; i >= 0; i-- {
next = xs[i](next)
}
return next
}
}
func firstHandler(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
ctx := context.WithValue(r.Context(), "td", &templateData{})
next.ServeHTTP(w, r.WithContext(ctx))
})
}
func finalHandler(w http.ResponseWriter, r *http.Request) {
/* Strip trailing slash from the URL */
path := r.URL.Path
if path != "/" && path[len(path)-1] == '/' {
path = path[:len(path)-1]
}
t, ok := templates[path]
if !ok {
w.WriteHeader(http.StatusNotFound)
t = notFoundTmpl
}
/* 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(), "/"),
})
}
data := r.Context().Value("td").(*templateData)
t.Execute(w, data)
}
func i18nHandler(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
var p, pZero Printer
if c, err := r.Cookie("locale"); err == nil {
p = printers[strings.ToLower(c.Value)]
}
td := r.Context().Value("td").(*templateData)
td.Printer = cmp.Or(p, defaultPrinter)
if p == pZero {
http.SetCookie(w, &http.Cookie{
Name: "redirect",
Value: r.URL.Path,
})
templates["/language"].Execute(w, td)
} else {
next.ServeHTTP(w, r)
}
})
}
func mintageHandler(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
td := r.Context().Value("td").(*templateData)
td.Countries = sortedCountries(td.Printer)
td.Code = strings.ToLower(r.FormValue("code"))
if !slices.ContainsFunc(td.Countries, func(c country) bool {
return c.Code == td.Code
}) {
td.Code = td.Countries[0].Code
}
td.Type = strings.ToLower(r.FormValue("type"))
switch td.Type {
case "circ", "nifc", "proof":
default:
td.Type = "circ"
}
path := filepath.Join("data", "mintages", td.Code)
f, err := os.Open(path)
if err != nil {
throwError(http.StatusInternalServerError, err, w, r)
return
}
defer f.Close()
td.Mintages, err = mintage.Parse(f, path)
if err != nil {
throwError(http.StatusInternalServerError, err, w, r)
return
}
next.ServeHTTP(w, r)
})
}
func setUserLanguage(w http.ResponseWriter, r *http.Request) {
loc := r.FormValue("locale")
_, ok := 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)
go func() {
if err := email.ServerError(err); err != nil {
log.Print(err)
}
}()
errorTmpl.Execute(w, struct {
Code int
Msg string
}{
Code: status,
Msg: http.StatusText(status),
})
}
|
