mirror of
https://github.com/kataras/iris.git
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100 lines
2.6 KiB
Go
100 lines
2.6 KiB
Go
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package i18n
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import (
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"strings"
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"github.com/Unknwon/i18n"
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"github.com/kataras/iris"
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)
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// AcceptLanguage is the Header key "Accept-Language"
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const AcceptLanguage = "Accept-Language"
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// Options the i18n options
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type Options struct {
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// Default set it if you want a default language
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//
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// Checked: Configuration state, not at runtime
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Default string
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// URLParameter is the name of the url parameter which the language can be indentified
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//
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// Checked: Serving state, runtime
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URLParameter string
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// Languages is a map[string]string which the key is the language i81n and the value is the file location
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//
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// Example of key is: 'en-US'
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// Example of value is: './locales/en-US.ini'
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Languages map[string]string
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}
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type i18nMiddleware struct {
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options Options
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}
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func (i *i18nMiddleware) Serve(ctx *iris.Context) {
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wasByCookie := false
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// try to get by url parameter
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language := ctx.URLParam(i.options.URLParameter)
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if language == "" {
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// then try to take the lang field from the cookie
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language = ctx.GetCookie("lang")
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if len(language) > 0 {
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wasByCookie = true
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} else {
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// try to get by the request headers(?)
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if langHeader := ctx.RequestHeader(AcceptLanguage); i18n.IsExist(langHeader) {
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language = langHeader
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}
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}
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}
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// if it was not taken by the cookie, then set the cookie in order to have it
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if !wasByCookie {
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ctx.SetCookieKV("language", language)
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}
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if language == "" {
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language = i.options.Default
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}
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locale := i18n.Locale{language}
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ctx.Set("language", language)
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ctx.Set("translate", locale.Tr)
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ctx.Next()
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}
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// I18nHandler returns the middleware which is just an iris.handler
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func I18nHandler(_options ...Options) *i18nMiddleware {
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i := &i18nMiddleware{}
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if len(_options) == 0 || (len(_options) > 0 && len(_options[0].Languages) == 0) {
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panic("You cannot use this middleware without set the Languages option, please try again and read the docs.")
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}
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i.options = _options[0]
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firstlanguage := ""
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//load the files
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for k, v := range i.options.Languages {
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if !strings.HasSuffix(v, ".ini") {
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v += ".ini"
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}
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err := i18n.SetMessage(k, v)
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if err != nil && err != i18n.ErrLangAlreadyExist {
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panic("Iris i18n Middleware: Failed to set locale file" + k + " Error:" + err.Error())
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}
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if firstlanguage == "" {
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firstlanguage = k
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}
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}
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// if not default language setted then set to the first of the i.options.Languages
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if i.options.Default == "" {
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i.options.Default = firstlanguage
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}
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i18n.SetDefaultLang(i.options.Default)
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return i
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}
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// I18n returns the middleware as iris.HandlerFunc with the passed options
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func I18n(_options ...Options) iris.HandlerFunc {
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return I18nHandler(_options...).Serve
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}
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