ad i18n and renderer and move headers

internal/api/html/i18n.go

@@ -0,0 +1,108 @@
+package html
+
+import (
+	"encoding/json"
+	"io/ioutil"
+	"net/http"
+	"path"
+
+	"github.com/BurntSushi/toml"
+	"github.com/caos/logging"
+	"github.com/nicksnyder/go-i18n/v2/i18n"
+	"golang.org/x/text/language"
+	"gopkg.in/yaml.v2"
+
+	"github.com/caos/zitadel/internal/api"
+	http_util "github.com/caos/zitadel/internal/api/http"
+	"github.com/caos/zitadel/internal/errors"
+)
+
+type Translator struct {
+	bundle        *i18n.Bundle
+	cookieName    string
+	cookieHandler *http_util.CookieHandler
+}
+
+type TranslatorConfig struct {
+	Path            string
+	DefaultLanguage language.Tag
+	CookieName      string
+}
+
+func NewTranslator(config TranslatorConfig) (*Translator, error) {
+	t := new(Translator)
+	var err error
+	t.bundle, err = newBundle(config.Path, config.DefaultLanguage)
+	if err != nil {
+		return nil, err
+	}
+	t.cookieHandler = http_util.NewCookieHandler()
+	t.cookieName = config.CookieName
+	return t, nil
+}
+
+func newBundle(i18nDir string, defaultLanguage language.Tag) (*i18n.Bundle, error) {
+	bundle := i18n.NewBundle(defaultLanguage)
+	bundle.RegisterUnmarshalFunc("yaml", yaml.Unmarshal)
+	bundle.RegisterUnmarshalFunc("yml", yaml.Unmarshal)
+	bundle.RegisterUnmarshalFunc("json", json.Unmarshal)
+	bundle.RegisterUnmarshalFunc("toml", toml.Unmarshal)
+	files, err := ioutil.ReadDir(i18nDir)
+	if err != nil {
+		return nil, errors.ThrowNotFound(err, "HTML-MnXRie", "path not found")
+	}
+	for _, file := range files {
+		bundle.MustLoadMessageFile(path.Join(i18nDir, file.Name()))
+	}
+	return bundle, nil
+}
+
+func (t *Translator) LocalizeFromRequest(r *http.Request, id string, args map[string]interface{}) string {
+	s, err := t.localizerFromRequest(r).Localize(&i18n.LocalizeConfig{
+		MessageID:    id,
+		TemplateData: args,
+	})
+	if err != nil {
+		logging.Log("HTML-MsF5sx").WithError(err).Warnf("missing translation")
+		return id
+	}
+	return s
+}
+
+func (t *Translator) Localize(id string, args map[string]interface{}) string {
+	s, _ := t.localizer().Localize(&i18n.LocalizeConfig{
+		MessageID:    id,
+		TemplateData: args,
+	})
+	return s
+}
+
+func (t *Translator) Lang(r *http.Request) language.Tag {
+	matcher := language.NewMatcher(t.bundle.LanguageTags())
+	tag, _ := language.MatchStrings(matcher, t.langsFromRequest(r)...)
+	return tag
+}
+
+func (t *Translator) SetLangCookie(w http.ResponseWriter, lang language.Tag) {
+	t.cookieHandler.SetCookie(w, t.cookieName, lang.String())
+}
+
+func (t *Translator) localizerFromRequest(r *http.Request) *i18n.Localizer {
+	return t.localizer(t.langsFromRequest(r)...)
+}
+
+func (t *Translator) localizer(langs ...string) *i18n.Localizer {
+	return i18n.NewLocalizer(t.bundle, langs...)
+}
+
+func (t *Translator) langsFromRequest(r *http.Request) []string {
+	langs := make([]string, 0)
+	if r != nil {
+		lang, err := t.cookieHandler.GetCookieValue(r, t.cookieName)
+		if err == nil {
+			langs = append(langs, lang)
+		}
+		langs = append(langs, r.Header.Get(api.AcceptLanguage))
+	}
+	return langs
+}