91 lines
2.0 KiB
Go
91 lines
2.0 KiB
Go
package pkg
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import (
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"context"
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"net/http"
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"github.com/leonelquinteros/gotext"
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"golang.org/x/text/language"
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)
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const contextLocaleKey = "numerus-locale"
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type Locale struct {
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*gotext.Locale
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Language language.Tag
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}
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func NewLocale(lang language.Tag) *Locale {
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return &Locale{
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gotext.NewLocale("locales", lang.String()),
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lang,
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}
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}
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func SetLocale(db *Db, next http.Handler) http.Handler {
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availableLanguages := mustGetAvailableLanguages(db)
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var matcher = language.NewMatcher(availableLanguages)
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locales := map[language.Tag]*Locale{}
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for _, lang := range availableLanguages {
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locale := NewLocale(lang)
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locale.AddDomain("numerus")
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locales[lang] = locale
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}
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defaultLocale := locales[language.Catalan]
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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var locale *Locale
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user := getUser(r)
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locale = locales[user.Language]
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if locale == nil {
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t, _, err := language.ParseAcceptLanguage(r.Header.Get("Accept-Language"))
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if err == nil {
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tag, _, _ := matcher.Match(t...)
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var ok bool
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locale, ok = locales[tag]
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for !ok && !tag.IsRoot() {
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tag = tag.Parent()
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locale, ok = locales[tag]
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}
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}
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}
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if locale == nil {
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locale = defaultLocale
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}
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ctx := context.WithValue(r.Context(), contextLocaleKey, locale)
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next.ServeHTTP(w, r.WithContext(ctx))
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})
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}
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func getLocale(r *http.Request) *Locale {
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return r.Context().Value(contextLocaleKey).(*Locale)
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}
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func pgettext(context string, str string, locale *Locale) string {
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return locale.GetC(str, context)
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}
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func mustGetAvailableLanguages(db *Db) []language.Tag {
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rows, err := db.Query(context.Background(), "select lang_tag from language where selectable")
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if err != nil {
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panic(err)
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}
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defer rows.Close()
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var langs []language.Tag
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for rows.Next() {
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var lang_tag string
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err = rows.Scan(&lang_tag)
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if err != nil {
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panic(err)
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}
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langs = append(langs, language.MustParse(lang_tag))
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}
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if rows.Err() != nil {
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panic(rows.Err())
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}
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return langs
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}
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