Albirew/nyaa-pantsu
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nyaa-pantsu/util/languages/translation.go

149 lignes
4,3 Kio
Go
Brut Vue normale Historique

package languages
import (
"errors"
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"fmt"
"html/template"
"net/http"
"path"
"path/filepath"
"github.com/ewhal/nyaa/config"
"github.com/ewhal/nyaa/model"
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"github.com/nicksnyder/go-i18n/i18n"
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"github.com/nicksnyder/go-i18n/i18n/language"
)
// this interface is required to prevent a cyclic import between the languages and userService package.
type UserRetriever interface {
RetrieveCurrentUser(r *http.Request) (model.User, error)
}
var (
defaultLanguage string = config.DefaultI18nConfig.DefaultLanguage
userRetriever UserRetriever = nil
)
// Initialize the languages translation
func InitI18n(conf config.I18nConfig, retriever UserRetriever) error {
defaultLanguage = conf.DefaultLanguage
userRetriever = retriever
defaultFilepath := path.Join(conf.TranslationsDirectory, conf.DefaultLanguage+".all.json")
err := i18n.LoadTranslationFile(defaultFilepath)
if err != nil {
panic(fmt.Sprintf("failed to load default translation file '%s': %v", defaultFilepath, err))
}
paths, err := filepath.Glob(path.Join(conf.TranslationsDirectory, "*.json"))
if err != nil {
return fmt.Errorf("failed to get translation files: %v", err)
}
for _, file := range paths {
err := i18n.LoadTranslationFile(file)
if err != nil {
return fmt.Errorf("failed to load translation file '%s': %v", file, err)
}
}
return nil
}
func GetDefaultLanguage() string {
return defaultLanguage
}
// When go-i18n finds a language with >0 translations, it uses it as the Tfunc
// However, if said language has a missing translation, it won't fallback to the "main" language
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func TfuncAndLanguageWithFallback(language string, languages ...string) (i18n.TranslateFunc, *language.Language, error) {
// Use the last language on the args as the fallback one.
fallbackLanguage := language
if languages != nil {
fallbackLanguage = languages[len(languages)-1]
}
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T, Tlang, err1 := i18n.TfuncAndLanguage(language, languages...)
fallbackT, fallbackTlang, err2 := i18n.TfuncAndLanguage(fallbackLanguage)
if err1 != nil && err2 != nil {
// fallbackT is still a valid function even with the error, it returns translationID.
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return fallbackT, fallbackTlang, err2
}
return func(translationID string, args ...interface{}) string {
if translated := T(translationID, args...); translated != translationID {
return translated
}
return fallbackT(translationID, args...)
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}, Tlang, nil
}
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func GetAvailableLanguages() (languages map[string]string) {
languages = make(map[string]string)
var T i18n.TranslateFunc
for _, languageTag := range i18n.LanguageTags() {
T, _ = i18n.Tfunc(languageTag)
/* Translation files should have an ID with the translated language name.
If they don't, just use the languageTag */
if languageName := T("language_name"); languageName != "language_name" {
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languages[languageTag] = languageName
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} else {
languages[languageTag] = languageTag
}
}
return
}
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func setTranslation(tmpl *template.Template, T i18n.TranslateFunc) {
tmpl.Funcs(map[string]interface{}{
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"T": func(str string, args ...interface{}) template.HTML {
return template.HTML(fmt.Sprintf(T(str), args...))
},
"Ts": func(str string, args ...interface{}) string {
return fmt.Sprintf(T(str), args...)
},
})
}
func GetDefaultTfunc() (i18n.TranslateFunc, error) {
return i18n.Tfunc(defaultLanguage)
}
func GetTfuncAndLanguageFromRequest(r *http.Request) (T i18n.TranslateFunc, Tlang *language.Language) {
defaultLanguage := GetDefaultLanguage()
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userLanguage := ""
user, err := getCurrentUser(r)
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if err == nil {
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userLanguage = user.Language
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}
cookie, err := r.Cookie("lang")
cookieLanguage := ""
if err == nil {
cookieLanguage = cookie.Value
}
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// go-i18n supports the format of the Accept-Language header, thankfully.
headerLanguage := r.Header.Get("Accept-Language")
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T, Tlang, _ = TfuncAndLanguageWithFallback(userLanguage, cookieLanguage, headerLanguage, defaultLanguage)
return
}
func SetTranslationFromRequest(tmpl *template.Template, r *http.Request) i18n.TranslateFunc {
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r.Header.Add("Vary", "Accept-Encoding")
T, _ := GetTfuncAndLanguageFromRequest(r)
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setTranslation(tmpl, T)
return T
}
func getCurrentUser(r *http.Request) (model.User, error) {
if userRetriever == nil {
return model.User{}, errors.New("failed to get current user: no user retriever set")
}
return userRetriever.RetrieveCurrentUser(r)
}