// get language from context
func getContextLanguage(ctx *tango.Context) string {
// get from cookie
lang := ctx.Cookie(langCookieName)
// get from header
if lang == "" {
al := ctx.Req().Header.Get("Accept-Language")
if len(al) > 4 {
lang = al[:5] // Only compare first 5 letters.
}
}
// get from query param
if lang == "" {
lang = ctx.Param(langParamName)
}
// get default if not find in context
lang = strings.ToLower(lang)
if !i18n.IsExist(lang) {
lang = i18n.GetLangByIndex(0)
}
return lang
}
func (r *RenderBase) CurLang() string {
al := r.Req().Header.Get("Accept-Language")
if len(al) > 4 {
al = al[:5] // Only compare first 5 letters.
if i18n.IsExist(formatLang(al)) {
return formatLang(al)
}
}
return "en-US"
}
// 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, "?")])
}
}
}
// setLangVer sets site language version.
func (this *baseAction) setLangVer() bool {
isNeedRedir := false
hasCookie := false
// 1. Check URL arguments.
lang := this.GetString("lang")
// 2. Get language information from cookies.
if len(lang) == 0 {
cookie, _ := this.GetCookie("lang")
if cookie != nil {
lang = cookie.Value
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 := this.Request.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 English.
if len(lang) == 0 {
lang = "en-US"
isNeedRedir = false
}
curLang := langType{
Lang: lang,
}
// Save language information in cookies.
if !hasCookie {
cookie := xweb.NewCookie("lang", curLang.Lang, 1<<31-1)
this.SetCookie(cookie)
}
restLangs := make([]*langType, 0, len(langTypes)-1)
for _, v := range langTypes {
if lang != v.Lang {
restLangs = append(restLangs, v)
} else {
curLang.Name = v.Name
}
}
// Set language properties.
this.AddTmplVars(&xweb.T{
"Lang": curLang.Lang,
"CurLang": curLang.Name,
"RestLangs": restLangs,
})
this.Lang = lang
return isNeedRedir
}
// setLang sets site language version.
func (this *BaseRouter) setLang() bool {
isNeedRedir := false
hasCookie := false
// get all lang names from i18n
langs := setting.Langs
// 1. Check URL arguments.
lang := this.Req().FormValue("lang")
// 2. Get language information from cookies.
if len(lang) == 0 {
lang = auth.GetCookie(this.Req(), "lang")
hasCookie = true
} else {
isNeedRedir = true
}
// Check again in case someone modify by purpose.
if !i18n.IsExist(lang) {
lang = ""
isNeedRedir = false
hasCookie = false
}
// 3. check if isLogin then use user setting
if len(lang) == 0 && this.IsLogin {
lang = i18n.GetLangByIndex(this.User.Lang)
}
// 4. Get language information from 'Accept-Language'.
if len(lang) == 0 {
al := this.Header().Get("Accept-Language")
if len(al) > 4 {
al = al[:5] // Only compare first 5 letters.
if i18n.IsExist(al) {
lang = al
}
}
}
// 4. DefaultLang language is Chinese.
if len(lang) == 0 {
//lang = "en-US"
lang = "zh-CN"
isNeedRedir = false
}
// Save language information in cookies.
if !hasCookie {
this.setLangCookie(lang)
}
// Set language properties.
this.Data["Lang"] = lang
this.Data["Langs"] = langs
this.Lang = lang
return isNeedRedir
}