Albirew/nyaa-pantsu
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nyaa-pantsu/utils/publicSettings/publicSettings.go
2017-07-12 12:04:20 +10:00

244 lignes
6,6 Kio
Go

package publicSettings
import (
"errors"
"fmt"
"html/template"
"path"
"path/filepath"
"strings"
"sort"
"github.com/NyaaPantsu/nyaa/config"
"github.com/NyaaPantsu/nyaa/models"
"github.com/gin-gonic/gin"
"github.com/nicksnyder/go-i18n/i18n"
"github.com/nicksnyder/go-i18n/i18n/language"
glang "golang.org/x/text/language"
"golang.org/x/text/language/display"
)
// UserRetriever : this interface is required to prevent a cyclic import between the languages and userService package.
type UserRetriever interface {
RetrieveCurrentUser(c *gin.Context) (*models.User, error)
}
type Language struct {
Name string
Code string
Tag string
}
type Languages []Language
// TemplateTfunc : T func used in template
type TemplateTfunc func(string, ...interface{}) template.HTML
var (
defaultLanguage = config.Get().I18n.DefaultLanguage
userRetriever UserRetriever
languages Languages
)
// InitI18n : Initialize the languages translation
func InitI18n(conf config.I18nConfig, retriever UserRetriever) error {
defaultLanguage = conf.DefaultLanguage
userRetriever = retriever
defaultFilepath := path.Join(conf.Directory, 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.Directory, "*.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
}
// GetDefaultLanguage : returns the default language from config
func GetDefaultLanguage() string {
return defaultLanguage
}
// TfuncAndLanguageWithFallback : 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
func TfuncAndLanguageWithFallback(language string, languages ...string) (i18n.TranslateFunc, *language.Language, error) {
fallbackLanguage := GetDefaultLanguage()
tFunc, tLang, err1 := i18n.TfuncAndLanguage(language, languages...)
// If fallbackLanguage fails, it will give the "id" field so we don't
// care about the error
fallbackT, fallbackTlang, _ := i18n.TfuncAndLanguage(fallbackLanguage)
translateFunction := func(translationID string, args ...interface{}) string {
if translated := tFunc(translationID, args...); translated != translationID {
return translated
}
return fallbackT(translationID, args...)
}
if err1 != nil {
tLang = fallbackTlang
}
return translateFunction, tLang, err1
}
// GetAvailableLanguages : Get languages available on the website, languages are parsed once at runtime
func GetAvailableLanguages() Languages {
if len(languages) > 0 {
return languages
}
// Need this to sort out languages alphabetically by language tag
var codes []string
for _, languageTag := range i18n.LanguageTags() {
codes = append(codes, languageTag)
}
languages = ParseLanguages(codes)
return languages
}
func getParentTag(languageTag string) glang.Tag {
lang := glang.Make(languageTag)
for !lang.Parent().IsRoot() {
lang = lang.Parent()
}
return lang
}
// ParseLanguages takes a list of language codes and convert them in languages object
func ParseLanguages(codes []string) Languages {
var langs Languages
sort.Strings(codes)
// Now build languages array
for _, languageTag := range codes {
lang := getParentTag(languageTag)
langs = append(langs, Language{strings.Title(display.Self.Name(glang.Make(languageTag))), lang.String(), languageTag})
}
return langs
}
// GetDefaultTfunc : Gets T func from default language
func GetDefaultTfunc() (i18n.TranslateFunc, error) {
return i18n.Tfunc(defaultLanguage)
}
// GetTfuncAndLanguageFromRequest : Gets the T func and chosen language from the request
func GetTfuncAndLanguageFromRequest(c *gin.Context) (T i18n.TranslateFunc, Tlang *language.Language) {
userLanguage := ""
user, _ := getCurrentUser(c)
if user.ID > 0 {
userLanguage = user.Language
}
cookie, err := c.Cookie("lang")
cookieLanguage := ""
if err == nil {
cookieLanguage = cookie
}
// go-i18n supports the format of the Accept-Language header
headerLanguage := c.Request.Header.Get("Accept-Language")
T, Tlang, _ = TfuncAndLanguageWithFallback(userLanguage, cookieLanguage, headerLanguage)
return
}
// GetTfuncFromRequest : Gets the T func from the request
func GetTfuncFromRequest(c *gin.Context) TemplateTfunc {
T, _ := GetTfuncAndLanguageFromRequest(c)
return func(id string, args ...interface{}) template.HTML {
return template.HTML(fmt.Sprintf(T(id), args...))
}
}
// GetThemeFromRequest : Gets the user selected theme from the request
func GetThemeFromRequest(c *gin.Context) string {
user, _ := getCurrentUser(c)
if user.ID > 0 {
return user.Theme
}
cookie, err := c.Cookie("theme")
if err == nil {
return cookie
}
return ""
}
// GetMascotFromRequest : Gets the user selected theme from the request
func GetMascotFromRequest(c *gin.Context) string {
user, _ := getCurrentUser(c)
if user.ID > 0 {
return user.Mascot
}
cookie, err := c.Cookie("mascot")
if err == nil {
return cookie
}
return "show"
}
// GetMascotUrlFromRequest : Get the user selected mascot url from the request.
// Returns an empty string if not set.
func GetMascotUrlFromRequest(c *gin.Context) string {
user, _ := getCurrentUser(c)
if user.ID > 0 {
return user.MascotURL
}
cookie, err := c.Cookie("mascot_url")
if err == nil {
return cookie
}
return ""
}
func getCurrentUser(c *gin.Context) (*models.User, error) {
if userRetriever == nil {
return &models.User{}, errors.New("failed to get current user: no user retriever set")
}
return userRetriever.RetrieveCurrentUser(c)
}
// Exist evaluate if a language exists or not (language code or language name)
func (langs Languages) Exist(name string) bool {
for _, language := range langs {
if language.Code == name || language.Name == name {
return true
}
}
return false
}
// Translate accepts a languageCode in string and translate the language to the language from the language code
func (lang *Language) Translate(languageCode template.HTML) string {
langTranslate := display.Tags(getParentTag(string(languageCode)))
return langTranslate.Name(lang)
}
// Flag reads the language's country code and return the country's flag if national true or the international flag for the language
func (lang *Language) Flag(national bool) string {
if national {
languageSplit := strings.Split(lang.Tag, "-")
if len(languageSplit) > 1 {
return languageSplit[1]
}
return lang.Tag
}
return lang.Code
}