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| # i18n [](https://travis-ci.org/go-macaron/i18n) [](http://gocover.io/github.com/go-macaron/i18n) | ||||
|  | ||||
| Middleware i18n provides app Internationalization and Localization for [Macaron](https://github.com/go-macaron/macaron). | ||||
|  | ||||
| ### Installation | ||||
|  | ||||
| 	go get github.com/go-macaron/i18n | ||||
| 	 | ||||
| ## Getting Help | ||||
|  | ||||
| - [API Reference](https://gowalker.org/github.com/go-macaron/i18n) | ||||
| - [Documentation](http://go-macaron.com/docs/middlewares/i18n) | ||||
|  | ||||
| ## License | ||||
|  | ||||
| This project is under the Apache License, Version 2.0. See the [LICENSE](LICENSE) file for the full license text. | ||||
							
								
								
									
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| // Copyright 2014 The Macaron Authors | ||||
| // | ||||
| // Licensed under the Apache License, Version 2.0 (the "License"): you may | ||||
| // not use this file except in compliance with the License. You may obtain | ||||
| // a copy of the License at | ||||
| // | ||||
| //     http://www.apache.org/licenses/LICENSE-2.0 | ||||
| // | ||||
| // Unless required by applicable law or agreed to in writing, software | ||||
| // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT | ||||
| // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the | ||||
| // License for the specific language governing permissions and limitations | ||||
| // under the License. | ||||
|  | ||||
| // Package i18n is a middleware that provides app Internationalization and Localization of Macaron. | ||||
| package i18n | ||||
|  | ||||
| import ( | ||||
| 	"fmt" | ||||
| 	"path" | ||||
| 	"strings" | ||||
|  | ||||
| 	"github.com/Unknwon/com" | ||||
| 	"github.com/Unknwon/i18n" | ||||
| 	"golang.org/x/text/language" | ||||
| 	"gopkg.in/macaron.v1" | ||||
| ) | ||||
|  | ||||
| const _VERSION = "0.3.0" | ||||
|  | ||||
| func Version() string { | ||||
| 	return _VERSION | ||||
| } | ||||
|  | ||||
| // initLocales initializes language type list and Accept-Language header matcher. | ||||
| func initLocales(opt Options) language.Matcher { | ||||
| 	tags := make([]language.Tag, len(opt.Langs)) | ||||
| 	for i, lang := range opt.Langs { | ||||
| 		tags[i] = language.Raw.Make(lang) | ||||
| 		fname := fmt.Sprintf(opt.Format, lang) | ||||
| 		// Append custom locale file. | ||||
| 		custom := []interface{}{} | ||||
| 		customPath := path.Join(opt.CustomDirectory, fname) | ||||
| 		if com.IsFile(customPath) { | ||||
| 			custom = append(custom, customPath) | ||||
| 		} | ||||
|  | ||||
| 		var locale interface{} | ||||
| 		if data, ok := opt.Files[fname]; ok { | ||||
| 			locale = data | ||||
| 		} else { | ||||
| 			locale = path.Join(opt.Directory, fname) | ||||
| 		} | ||||
|  | ||||
| 		err := i18n.SetMessageWithDesc(lang, opt.Names[i], locale, custom...) | ||||
| 		if err != nil && err != i18n.ErrLangAlreadyExist { | ||||
| 			panic(fmt.Errorf("fail to set message file(%s): %v", lang, err)) | ||||
| 		} | ||||
| 	} | ||||
| 	return language.NewMatcher(tags) | ||||
| } | ||||
|  | ||||
| // A Locale describles the information of localization. | ||||
| type Locale struct { | ||||
| 	i18n.Locale | ||||
| } | ||||
|  | ||||
| // Language returns language current locale represents. | ||||
| func (l Locale) Language() string { | ||||
| 	return l.Lang | ||||
| } | ||||
|  | ||||
| // Options represents a struct for specifying configuration options for the i18n middleware. | ||||
| type Options struct { | ||||
| 	// Suburl of path. Default is empty. | ||||
| 	SubURL string | ||||
| 	// Directory to load locale files. Default is "conf/locale" | ||||
| 	Directory string | ||||
| 	// File stores actual data of locale files. Used for in-memory purpose. | ||||
| 	Files map[string][]byte | ||||
| 	// Custom directory to overload locale files. Default is "custom/conf/locale" | ||||
| 	CustomDirectory string | ||||
| 	// Langauges that will be supported, order is meaningful. | ||||
| 	Langs []string | ||||
| 	// Human friendly names corresponding to Langs list. | ||||
| 	Names []string | ||||
| 	// Default language locale, leave empty to remain unset. | ||||
| 	DefaultLang string | ||||
| 	// Locale file naming style. Default is "locale_%s.ini". | ||||
| 	Format string | ||||
| 	// Name of language parameter name in URL. Default is "lang". | ||||
| 	Parameter string | ||||
| 	// Redirect when user uses get parameter to specify language. | ||||
| 	Redirect bool | ||||
| 	// Name that maps into template variable. Default is "i18n". | ||||
| 	TmplName string | ||||
| 	// Configuration section name. Default is "i18n". | ||||
| 	Section string | ||||
| } | ||||
|  | ||||
| func prepareOptions(options []Options) Options { | ||||
| 	var opt Options | ||||
| 	if len(options) > 0 { | ||||
| 		opt = options[0] | ||||
| 	} | ||||
|  | ||||
| 	if len(opt.Section) == 0 { | ||||
| 		opt.Section = "i18n" | ||||
| 	} | ||||
| 	sec := macaron.Config().Section(opt.Section) | ||||
|  | ||||
| 	opt.SubURL = strings.TrimSuffix(opt.SubURL, "/") | ||||
|  | ||||
| 	if len(opt.Langs) == 0 { | ||||
| 		opt.Langs = sec.Key("LANGS").Strings(",") | ||||
| 	} | ||||
| 	if len(opt.Names) == 0 { | ||||
| 		opt.Names = sec.Key("NAMES").Strings(",") | ||||
| 	} | ||||
| 	if len(opt.Langs) == 0 { | ||||
| 		panic("no language is specified") | ||||
| 	} else if len(opt.Langs) != len(opt.Names) { | ||||
| 		panic("length of langs is not same as length of names") | ||||
| 	} | ||||
| 	i18n.SetDefaultLang(opt.DefaultLang) | ||||
|  | ||||
| 	if len(opt.Directory) == 0 { | ||||
| 		opt.Directory = sec.Key("DIRECTORY").MustString("conf/locale") | ||||
| 	} | ||||
| 	if len(opt.CustomDirectory) == 0 { | ||||
| 		opt.CustomDirectory = sec.Key("CUSTOM_DIRECTORY").MustString("custom/conf/locale") | ||||
| 	} | ||||
| 	if len(opt.Format) == 0 { | ||||
| 		opt.Format = sec.Key("FORMAT").MustString("locale_%s.ini") | ||||
| 	} | ||||
| 	if len(opt.Parameter) == 0 { | ||||
| 		opt.Parameter = sec.Key("PARAMETER").MustString("lang") | ||||
| 	} | ||||
| 	if !opt.Redirect { | ||||
| 		opt.Redirect = sec.Key("REDIRECT").MustBool() | ||||
| 	} | ||||
| 	if len(opt.TmplName) == 0 { | ||||
| 		opt.TmplName = sec.Key("TMPL_NAME").MustString("i18n") | ||||
| 	} | ||||
|  | ||||
| 	return opt | ||||
| } | ||||
|  | ||||
| type LangType struct { | ||||
| 	Lang, Name string | ||||
| } | ||||
|  | ||||
| // I18n is a middleware provides localization layer for your application. | ||||
| // Paramenter langs must be in the form of "en-US", "zh-CN", etc. | ||||
| // Otherwise it may not recognize browser input. | ||||
| func I18n(options ...Options) macaron.Handler { | ||||
| 	opt := prepareOptions(options) | ||||
| 	m := initLocales(opt) | ||||
| 	return func(ctx *macaron.Context) { | ||||
| 		isNeedRedir := false | ||||
| 		hasCookie := false | ||||
|  | ||||
| 		// 1. Check URL arguments. | ||||
| 		lang := ctx.Query(opt.Parameter) | ||||
|  | ||||
| 		// 2. Get language information from cookies. | ||||
| 		if len(lang) == 0 { | ||||
| 			lang = ctx.GetCookie("lang") | ||||
| 			hasCookie = true | ||||
| 		} else { | ||||
| 			isNeedRedir = true | ||||
| 		} | ||||
|  | ||||
| 		// Check again in case someone modify by purpose. | ||||
| 		if !i18n.IsExist(lang) { | ||||
| 			lang = "" | ||||
| 			isNeedRedir = false | ||||
| 			hasCookie = false | ||||
| 		} | ||||
|  | ||||
| 		// 3. Get language information from 'Accept-Language'. | ||||
| 		// The first element in the list is chosen to be the default language automatically. | ||||
| 		if len(lang) == 0 { | ||||
| 			tags, _, _ := language.ParseAcceptLanguage(ctx.Req.Header.Get("Accept-Language")) | ||||
| 			tag, _, _ := m.Match(tags...) | ||||
| 			lang = tag.String() | ||||
| 			isNeedRedir = false | ||||
| 		} | ||||
|  | ||||
| 		curLang := LangType{ | ||||
| 			Lang: lang, | ||||
| 		} | ||||
|  | ||||
| 		// Save language information in cookies. | ||||
| 		if !hasCookie { | ||||
| 			ctx.SetCookie("lang", curLang.Lang, 1<<31-1, "/"+strings.TrimPrefix(opt.SubURL, "/")) | ||||
| 		} | ||||
|  | ||||
| 		restLangs := make([]LangType, 0, i18n.Count()-1) | ||||
| 		langs := i18n.ListLangs() | ||||
| 		names := i18n.ListLangDescs() | ||||
| 		for i, v := range langs { | ||||
| 			if lang != v { | ||||
| 				restLangs = append(restLangs, LangType{v, names[i]}) | ||||
| 			} else { | ||||
| 				curLang.Name = names[i] | ||||
| 			} | ||||
| 		} | ||||
|  | ||||
| 		// Set language properties. | ||||
| 		locale := Locale{i18n.Locale{lang}} | ||||
| 		ctx.Map(locale) | ||||
| 		ctx.Locale = locale | ||||
| 		ctx.Data[opt.TmplName] = locale | ||||
| 		ctx.Data["Tr"] = i18n.Tr | ||||
| 		ctx.Data["Lang"] = locale.Lang | ||||
| 		ctx.Data["LangName"] = curLang.Name | ||||
| 		ctx.Data["AllLangs"] = append([]LangType{curLang}, restLangs...) | ||||
| 		ctx.Data["RestLangs"] = restLangs | ||||
|  | ||||
| 		if opt.Redirect && isNeedRedir { | ||||
| 			ctx.Redirect(opt.SubURL + ctx.Req.RequestURI[:strings.Index(ctx.Req.RequestURI, "?")]) | ||||
| 		} | ||||
| 	} | ||||
| } | ||||
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