ad i18n and renderer and move headers

internal/api/html/renderer.go

@@ -0,0 +1,82 @@
+package html
+
+import (
+	"net/http"
+	"path"
+	"text/template"
+
+	"github.com/caos/logging"
+	"golang.org/x/text/language"
+)
+
+const (
+	TranslateFn = "t"
+)
+
+type Renderer struct {
+	Templates map[string]*template.Template
+	i18n      *Translator
+}
+
+func NewRenderer(templatesDir string, tmplMapping map[string]string, funcs map[string]interface{}, translatorConfig TranslatorConfig) (*Renderer, error) {
+	var err error
+	r := new(Renderer)
+	r.i18n, err = NewTranslator(translatorConfig)
+	if err != nil {
+		return nil, err
+	}
+	r.loadTemplates(templatesDir, tmplMapping, funcs)
+	return r, nil
+}
+
+func (r *Renderer) RenderTemplate(w http.ResponseWriter, req *http.Request, tmpl *template.Template, data interface{}, reqFuncs map[string]interface{}) {
+	reqFuncs = r.registerTranslateFn(req, reqFuncs)
+	if err := tmpl.Funcs(reqFuncs).Execute(w, data); err != nil {
+		logging.Log("HTML-lF8F6w").WithError(err).WithField("template", tmpl.Name).Error("error rendering template")
+	}
+}
+
+func (r *Renderer) Localize(id string, args map[string]interface{}) string {
+	return r.i18n.Localize(id, args)
+}
+
+func (r *Renderer) LocalizeFromRequest(req *http.Request, id string, args map[string]interface{}) string {
+	return r.i18n.LocalizeFromRequest(req, id, args)
+}
+func (r *Renderer) Lang(req *http.Request) language.Tag {
+	return r.i18n.Lang(req)
+}
+
+func (r *Renderer) loadTemplates(templatesDir string, tmplMapping map[string]string, funcs map[string]interface{}) {
+	funcs = r.registerTranslateFn(nil, funcs)
+	funcs[TranslateFn] = func(id string, args ...interface{}) string {
+		return id
+	}
+	tmpls := template.Must(template.New("").Funcs(funcs).ParseGlob(path.Join(templatesDir, "*.html")))
+	r.Templates = make(map[string]*template.Template, len(tmplMapping))
+	for name, file := range tmplMapping {
+		r.Templates[name] = tmpls.Lookup(file)
+	}
+}
+
+func (r *Renderer) registerTranslateFn(req *http.Request, funcs map[string]interface{}) map[string]interface{} {
+	if funcs == nil {
+		funcs = make(map[string]interface{})
+	}
+	funcs[TranslateFn] = func(id string, args ...interface{}) string {
+		m := map[string]interface{}{}
+		var key string
+		for i, arg := range args {
+			if i%2 == 0 {
+				key = arg.(string)
+				continue
+			}
+			m[key] = arg
+		}
+		if r == nil {
+			return r.Localize(id, m)
+		}
+		return r.LocalizeFromRequest(req, id, m)
+	}
+	return funcs
+}