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package ki18n
import (
"context"
"fmt"
"io/fs"
"net/http"
"time"
"github.com/a-h/templ"
"github.com/kataras/i18n"
)
type contextKey struct{}
const defaultLang = "en-GB"
type Strategy interface {
Detect(r *http.Request) string
}
type cookieStrategy struct{ name string }
func (s cookieStrategy) Detect(r *http.Request) string {
c, err := r.Cookie(s.name)
if err != nil {
return ""
}
return c.Value
}
func CookieStrategy(name string) Strategy {
return cookieStrategy{name: name}
}
type acceptLanguageStrategy struct{}
func (acceptLanguageStrategy) Detect(r *http.Request) string {
lang := i18n.Default.GetLocale(r).Language()
if lang == defaultLang {
if r.Header.Get("Accept-Language") == "" {
return ""
}
}
return lang
}
var AcceptLanguageStrategy Strategy = acceptLanguageStrategy{}
func LangMiddleware(strategies ...Strategy) func(http.Handler) http.Handler {
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
lang := ""
for _, s := range strategies {
if l := s.Detect(r); l != "" {
lang = l
break
}
}
if lang == "" {
lang = defaultLang
}
ctx := context.WithValue(r.Context(), contextKey{}, lang)
next.ServeHTTP(w, r.WithContext(ctx))
})
}
}
var frenchMonths = [...]string{
"janvier", "février", "mars", "avril", "mai", "juin",
"juillet", "août", "septembre", "octobre", "novembre", "décembre",
}
// Locale configures a language for use with ki18n. Lang is a BCP-47 tag (e.g. "es-ES").
// FormatTime is optional; if nil, en-GB formatting is used.
type Locale struct {
Lang string
FormatTime func(time.Time) string
}
var defaultLocales = []Locale{
{
Lang: "en-GB",
FormatTime: func(t time.Time) string { return t.Format("2 January 2006") },
},
{
Lang: "fr-FR",
FormatTime: func(t time.Time) string {
return fmt.Sprintf("%d %s %d", t.Day(), frenchMonths[t.Month()-1], t.Year())
},
},
}
var timeFormatters map[string]func(time.Time) string
func FormatTime(ctx context.Context, t time.Time) string {
lang, _ := ctx.Value(contextKey{}).(string)
f, ok := timeFormatters[lang]
if !ok {
f = timeFormatters[defaultLang]
}
return f(t)
}
func Tr(ctx context.Context, format string, args ...any) templ.Component {
lang, _ := ctx.Value(contextKey{}).(string)
if lang == "" {
lang = defaultLang
}
msg := i18n.Tr(lang, format, args...)
if msg == "" {
msg = format
}
return templ.Raw(msg)
}
func Init(localesFS fs.FS, extra ...Locale) error {
all := append(defaultLocales, extra...)
langs := make([]string, len(all))
timeFormatters = make(map[string]func(time.Time) string, len(all))
for i, loc := range all {
langs[i] = loc.Lang
if loc.FormatTime != nil {
timeFormatters[loc.Lang] = loc.FormatTime
} else {
timeFormatters[loc.Lang] = timeFormatters[defaultLang]
}
}
loader, err := i18n.FS(localesFS, "*/*.yml")
if err != nil {
return err
}
inst, err := i18n.New(loader, langs...)
if err != nil {
return err
}
i18n.Default = inst
return nil
}
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