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

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Former-commit-id: ed84f99c89f43fe5e980a8e6d0ee22c186f0e1b9
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Gerasimos (Makis) Maropoulos
2017-02-14 05:54:11 +02:00
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## Middleware information
This folder contains a middleware for internationalization uses a third-party package named i81n.
More can be found here:
[https://github.com/Unknwon/i18n](https://github.com/Unknwon/i18n)
## Install
```sh
$ go get -u github.com/iris-contrib/middleware/i18n
```
## Description
Package i18n is for app Internationalization and Localization.
## How to use
Create folder named 'locales'
```
///Files:
./locales/locale_en-US.ini
./locales/locale_el-US.ini
```
Contents on locale_en-US:
```
hi = hello, %s
```
Contents on locale_el-GR:
```
hi = <20><><EFBFBD><EFBFBD>, %s
```
```go
package main
import (
"github.com/kataras/iris"
"github.com/iris-contrib/middleware/i18n"
)
func main() {
iris.UseFunc(i18n.New(i18n.Config{Default: "en-US",
Languages: map[string]string{
"en-US": "./locales/locale_en-US.ini",
"el-GR": "./locales/locale_el-GR.ini",
"zh-CN": "./locales/locale_zh-CN.ini"}}))
// or iris.Use(i18n.I18nHandler(....))
// or iris.Get("/",i18n.I18n(....), func (ctx *iris.Context){})
iris.Get("/", func(ctx *iris.Context) {
hi := ctx.GetFmt("translate")("hi", "maki") // hi is the key, 'maki' is the %s, the second parameter is optional
language := ctx.Get("language") // language is the language key, example 'en-US'
ctx.Write("From the language %s translated output: %s", language, hi)
})
iris.Listen(":8080")
}
```
### [For a working example, click here](https://github.com/kataras/iris/tree/examples/middleware_internationalization_i18n)

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hi = Γεια, %s

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hi = hello, %s

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hi = 您好，%s

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package main
import (
"gopkg.in/kataras/iris.v6"
"gopkg.in/kataras/iris.v6/adaptors/httprouter"
"gopkg.in/kataras/iris.v6/middleware/i18n"
)
func main() {
app := iris.New()
app.Adapt(httprouter.New()) // adapt a router first of all
app.Use(i18n.New(i18n.Config{
Default: "en-US",
URLParameter: "lang",
Languages: map[string]string{
"en-US": "./locales/locale_en-US.ini",
"el-GR": "./locales/locale_el-GR.ini",
"zh-CN": "./locales/locale_zh-CN.ini"}}))
app.Get("/", func(ctx *iris.Context) {
// it tries to find the language by:
// ctx.Get("language") , that should be setted on other middleware before the i18n middleware*
// if that was empty then
// it tries to find from the URLParameter setted on the configuration
// if not found then
// it tries to find the language by the "lang" cookie
// if didn't found then it it set to the Default setted on the configuration
// hi is the key, 'kataras' is the %s on the .ini file
// the second parameter is optional
// hi := ctx.Translate("hi", "kataras")
// or:
hi := i18n.Translate(ctx, "hi", "kataras")
language := ctx.Get(iris.TranslateLanguageContextKey) // language is the language key, example 'en-US'
// The first succeed language found saved at the cookie with name ("language"),
// you can change that by changing the value of the: iris.TranslateLanguageContextKey
ctx.Writef("From the language %s translated output: %s", language, hi)
})
// go to http://localhost:8080/?lang=el-GR
// or http://localhost:8080
// or http://localhost:8080/?lang=zh-CN
app.Listen(":8080")
}

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package i18n
// Config the i18n options
type Config struct {
// Default set it if you want a default language
//
// Checked: Configuration state, not at runtime
Default string
// URLParameter is the name of the url parameter which the language can be indentified
//
// Checked: Serving state, runtime
URLParameter string
// Languages is a map[string]string which the key is the language i81n and the value is the file location
//
// Example of key is: 'en-US'
// Example of value is: './locales/en-US.ini'
Languages map[string]string
}

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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
}