forked from gitea/gitea
60 lines
1.6 KiB
Go
60 lines
1.6 KiB
Go
// Copyright 2020 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package middleware
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import (
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"net/http"
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"code.gitea.io/gitea/modules/translation"
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"code.gitea.io/gitea/modules/translation/i18n"
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"golang.org/x/text/language"
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)
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// Locale handle locale
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func Locale(resp http.ResponseWriter, req *http.Request) translation.Locale {
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// 1. Check URL arguments.
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lang := req.URL.Query().Get("lang")
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changeLang := lang != ""
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// 2. Get language information from cookies.
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if len(lang) == 0 {
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ck, _ := req.Cookie("lang")
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if ck != nil {
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lang = ck.Value
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}
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}
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// Check again in case someone changes the supported language list.
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if lang != "" && !i18n.DefaultLocales.HasLang(lang) {
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lang = ""
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changeLang = false
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}
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// 3. Get language information from 'Accept-Language'.
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// The first element in the list is chosen to be the default language automatically.
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if len(lang) == 0 {
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tags, _, _ := language.ParseAcceptLanguage(req.Header.Get("Accept-Language"))
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tag := translation.Match(tags...)
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lang = tag.String()
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}
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if changeLang {
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SetLocaleCookie(resp, lang, 1<<31-1)
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}
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return translation.NewLocale(lang)
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}
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// SetLocaleCookie convenience function to set the locale cookie consistently
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func SetLocaleCookie(resp http.ResponseWriter, lang string, maxAge int) {
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SetSiteCookie(resp, "lang", lang, maxAge)
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}
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// DeleteLocaleCookie convenience function to delete the locale cookie consistently
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// Setting the lang cookie will trigger the middleware to reset the language to previous state.
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func DeleteLocaleCookie(resp http.ResponseWriter) {
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SetSiteCookie(resp, "lang", "", -1)
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}
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