20 days of unstoppable work. Waiting fo go 1.8, I didn't finish yet, some touches remains.

Former-commit-id: ed84f99c89f43fe5e980a8e6d0ee22c186f0e1b9

middleware/i18n/i18n.go

@@ -0,0 +1,101 @@
+package i18n
+
+import (
+	"reflect"
+	"strings"
+
+	"github.com/Unknwon/i18n"
+	"gopkg.in/kataras/iris.v6"
+)
+
+type i18nMiddleware struct {
+	config Config
+}
+
+// Serve serves the request, the actual middleware's job is here
+func (i *i18nMiddleware) Serve(ctx *iris.Context) {
+	wasByCookie := false
+
+	language := i.config.Default
+	if ctx.GetString(iris.TranslateLanguageContextKey) == "" {
+		// try to get by url parameter
+		language = ctx.URLParam(i.config.URLParameter)
+
+		if language == "" {
+			// then try to take the lang field from the cookie
+			language = ctx.GetCookie(iris.TranslateLanguageContextKey)
+
+			if len(language) > 0 {
+				wasByCookie = true
+			} else {
+				// try to get by the request headers(?)
+				if langHeader := ctx.RequestHeader("Accept-Language"); i18n.IsExist(langHeader) {
+					language = langHeader
+				}
+			}
+		}
+		// if it was not taken by the cookie, then set the cookie in order to have it
+		if !wasByCookie {
+			ctx.SetCookieKV(iris.TranslateLanguageContextKey, language)
+		}
+		if language == "" {
+			language = i.config.Default
+		}
+		ctx.Set(iris.TranslateLanguageContextKey, language)
+	}
+	locale := i18n.Locale{Lang: language}
+
+	ctx.Set(iris.TranslateFunctionContextKey, locale.Tr)
+	ctx.Next()
+}
+
+// Translate returns the translated word from a context
+// the second parameter is the key of the world or line inside the .ini file
+// the third parameter is the '%s' of the world or line inside the .ini file
+func Translate(ctx *iris.Context, format string, args ...interface{}) string {
+	return ctx.Translate(format, args...)
+}
+
+// New returns a new i18n middleware
+func New(c Config) iris.HandlerFunc {
+	if len(c.Languages) == 0 {
+		panic("You cannot use this middleware without set the Languages option, please try again and read the _example.")
+	}
+	i := &i18nMiddleware{config: c}
+	firstlanguage := ""
+	//load the files
+	for k, v := range c.Languages {
+		if !strings.HasSuffix(v, ".ini") {
+			v += ".ini"
+		}
+		err := i18n.SetMessage(k, v)
+		if err != nil && err != i18n.ErrLangAlreadyExist {
+			panic("Iris i18n Middleware: Failed to set locale file" + k + " Error:" + err.Error())
+		}
+		if firstlanguage == "" {
+			firstlanguage = k
+		}
+	}
+	// if not default language setted then set to the first of the i.options.Languages
+	if c.Default == "" {
+		c.Default = firstlanguage
+	}
+
+	i18n.SetDefaultLang(i.config.Default)
+	return i.Serve
+}
+
+// TranslatedMap returns translated map[string]interface{} from i18n structure
+func TranslatedMap(sourceInterface interface{}, ctx *iris.Context) map[string]interface{} {
+	iType := reflect.TypeOf(sourceInterface).Elem()
+	result := make(map[string]interface{})
+
+	for i := 0; i < iType.NumField(); i++ {
+		fieldName := reflect.TypeOf(sourceInterface).Elem().Field(i).Name
+		fieldValue := reflect.ValueOf(sourceInterface).Elem().Field(i).String()
+
+		result[fieldName] = Translate(ctx, fieldValue)
+	}
+
+	return result
+}