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-rw-r--r--modules/web/middleware/locale.go59
1 files changed, 59 insertions, 0 deletions
diff --git a/modules/web/middleware/locale.go b/modules/web/middleware/locale.go
new file mode 100644
index 0000000..34a16f0
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+++ b/modules/web/middleware/locale.go
@@ -0,0 +1,59 @@
+// Copyright 2020 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package middleware
+
+import (
+ "net/http"
+
+ "code.gitea.io/gitea/modules/translation"
+ "code.gitea.io/gitea/modules/translation/i18n"
+
+ "golang.org/x/text/language"
+)
+
+// Locale handle locale
+func Locale(resp http.ResponseWriter, req *http.Request) translation.Locale {
+ // 1. Check URL arguments.
+ lang := req.URL.Query().Get("lang")
+ changeLang := lang != ""
+
+ // 2. Get language information from cookies.
+ if len(lang) == 0 {
+ ck, _ := req.Cookie("lang")
+ if ck != nil {
+ lang = ck.Value
+ }
+ }
+
+ // Check again in case someone changes the supported language list.
+ if lang != "" && !i18n.DefaultLocales.HasLang(lang) {
+ lang = ""
+ changeLang = false
+ }
+
+ // 3. Get language information from 'Accept-Language'.
+ // The first element in the list is chosen to be the default language automatically.
+ if len(lang) == 0 {
+ tags, _, _ := language.ParseAcceptLanguage(req.Header.Get("Accept-Language"))
+ tag := translation.Match(tags...)
+ lang = tag.String()
+ }
+
+ if changeLang {
+ SetLocaleCookie(resp, lang, 1<<31-1)
+ }
+
+ return translation.NewLocale(lang)
+}
+
+// SetLocaleCookie convenience function to set the locale cookie consistently
+func SetLocaleCookie(resp http.ResponseWriter, lang string, maxAge int) {
+ SetSiteCookie(resp, "lang", lang, maxAge)
+}
+
+// DeleteLocaleCookie convenience function to delete the locale cookie consistently
+// Setting the lang cookie will trigger the middleware to reset the language to previous state.
+func DeleteLocaleCookie(resp http.ResponseWriter) {
+ SetSiteCookie(resp, "lang", "", -1)
+}