func settingLocales() {
// load locales with locale_LANG.ini files
langs := "en-US|zh-CN"
for _, lang := range strings.Split(langs, "|") {
lang = strings.TrimSpace(lang)
files := []interface{}{"conf/" + "locale_" + lang + ".ini"}
if fh, err := os.Open(files[0].(string)); err == nil {
fh.Close()
} else {
files = nil
}
if err := i18n.SetMessage(lang, "conf/global/"+"locale_"+lang+".ini", files...); err != nil {
log.Error("Fail to set message file: " + err.Error())
os.Exit(2)
}
}
Langs = i18n.ListLangs()
}
// I18n is a middleware provides localization layer for your application.
// Paramenter langs must be in the form of "en-US", "zh-CN", etc.
// Otherwise it may not recognize browser input.
func I18n(options ...Options) macaron.Handler {
opt := prepareOptions(options)
initLocales(opt)
return func(ctx *macaron.Context) {
isNeedRedir := false
hasCookie := false
// 1. Check URL arguments.
lang := ctx.Query(opt.Parameter)
// 2. Get language information from cookies.
if len(lang) == 0 {
lang = ctx.GetCookie("lang")
hasCookie = true
} else {
isNeedRedir = true
}
// Check again in case someone modify by purpose.
if !i18n.IsExist(lang) {
lang = ""
isNeedRedir = false
hasCookie = false
}
// 3. Get language information from 'Accept-Language'.
if len(lang) == 0 {
al := ctx.Req.Header.Get("Accept-Language")
if len(al) > 4 {
al = al[:5] // Only compare first 5 letters.
if i18n.IsExist(al) {
lang = al
}
}
}
// 4. Default language is the first element in the list.
if len(lang) == 0 {
lang = i18n.GetLangByIndex(0)
isNeedRedir = false
}
curLang := LangType{
Lang: lang,
}
// Save language information in cookies.
if !hasCookie {
ctx.SetCookie("lang", curLang.Lang, 1<<31-1, "/"+strings.TrimPrefix(opt.SubURL, "/"))
}
restLangs := make([]LangType, 0, i18n.Count()-1)
langs := i18n.ListLangs()
names := i18n.ListLangDescs()
for i, v := range langs {
if lang != v {
restLangs = append(restLangs, LangType{v, names[i]})
} else {
curLang.Name = names[i]
}
}
// Set language properties.
locale := Locale{i18n.Locale{lang}}
ctx.Map(locale)
ctx.Locale = locale
ctx.Data[opt.TmplName] = locale
ctx.Data["Tr"] = i18n.Tr
ctx.Data["Lang"] = locale.Lang
ctx.Data["LangName"] = curLang.Name
ctx.Data["AllLangs"] = append([]LangType{curLang}, restLangs...)
ctx.Data["RestLangs"] = restLangs
if opt.Redirect && isNeedRedir {
ctx.Redirect(opt.SubURL + ctx.Req.RequestURI[:strings.Index(ctx.Req.RequestURI, "?")])
}
}
}