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|
package ki18n
import (
"context"
"io/fs"
"net/http"
"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))
})
}
}
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(fs fs.FS) error {
loader, err := i18n.FS(fs, "*/*.yml")
if err != nil {
return err
}
inst, err := i18n.New(loader, "en-GB", "fr-FR")
if err != nil {
return err
}
i18n.Default = inst
return nil
}
|
