Add translation system (#104)

internal/web/auth.go

@@ -27,7 +27,7 @@ import (
 var title = cases.Title(language.English)
 
 func register(ctx echo.Context) error {
-	setData(ctx, "title", "New account")
+	setData(ctx, "title", tr(ctx, "auth.new-account"))
 	setData(ctx, "htmlTitle", "New account")
 	setData(ctx, "disableForm", getData(ctx, "DisableLoginForm"))
 	return html(ctx, "auth_form.html")
@@ -87,7 +87,7 @@ func processRegister(ctx echo.Context) error {
 }
 
 func login(ctx echo.Context) error {
-	setData(ctx, "title", "Login")
+	setData(ctx, "title", tr(ctx, "auth.login"))
 	setData(ctx, "htmlTitle", "Login")
 	setData(ctx, "disableForm", getData(ctx, "DisableLoginForm"))
 	return html(ctx, "auth_form.html")

internal/web/gist.go

@@ -121,19 +121,21 @@ func allGists(ctx echo.Context) error {
 	pageInt := getPage(ctx)
 
 	sort := "created"
+	sortText := tr(ctx, "gist.list.sort-by-created")
 	order := "desc"
-	orderText := "Recently"
+	orderText := tr(ctx, "gist.list.order-by-desc")
 
 	if ctx.QueryParam("sort") == "updated" {
 		sort = "updated"
+		sortText = tr(ctx, "gist.list.sort-by-updated")
 	}
 
 	if ctx.QueryParam("order") == "asc" {
 		order = "asc"
-		orderText = "Least recently"
+		orderText = tr(ctx, "gist.list.order-by-asc")
 	}
 
-	setData(ctx, "sort", sort)
+	setData(ctx, "sort", sortText)
 	setData(ctx, "order", orderText)
 
 	var gists []*db.Gist

internal/web/server.go

@@ -12,8 +12,11 @@ import (
 	"github.com/thomiceli/opengist/internal/config"
 	"github.com/thomiceli/opengist/internal/db"
 	"github.com/thomiceli/opengist/internal/git"
+	"github.com/thomiceli/opengist/internal/i18n"
 	"github.com/thomiceli/opengist/public"
 	"github.com/thomiceli/opengist/templates"
+	"golang.org/x/text/language"
+	htmlpkg "html"
 	"html/template"
 	"io"
 	"net/http"
@@ -105,6 +108,13 @@ var fm = template.FuncMap{
 		}
 		return s
 	},
+	"unescape": htmlpkg.UnescapeString,
+	"join": func(s ...string) string {
+		return strings.Join(s, "")
+	},
+	"toStr": func(i interface{}) string {
+		return fmt.Sprint(i)
+	},
 }
 
 type Template struct {
@@ -129,7 +139,12 @@ func NewServer(isDev bool) *Server {
 	e.HideBanner = true
 	e.HidePort = true
 
+	if err := i18n.Locales.LoadAll(); err != nil {
+		log.Fatal().Err(err).Msg("Failed to load locales")
+	}
+
 	e.Use(dataInit)
+	e.Use(locale)
 	e.Pre(middleware.MethodOverrideWithConfig(middleware.MethodOverrideConfig{
 		Getter: middleware.MethodFromForm("_method"),
 	}))
@@ -297,6 +312,50 @@ func dataInit(next echo.HandlerFunc) echo.HandlerFunc {
 	}
 }
 
+func locale(next echo.HandlerFunc) echo.HandlerFunc {
+	return func(ctx echo.Context) error {
+
+		// Check URL arguments
+		lang := ctx.Request().URL.Query().Get("lang")
+		changeLang := lang != ""
+
+		// Then check cookies
+		if len(lang) == 0 {
+			cookie, _ := ctx.Request().Cookie("lang")
+			if cookie != nil {
+				lang = cookie.Value
+			}
+		}
+
+		// Check again in case someone changes the supported language list.
+		if lang != "" && !i18n.Locales.HasLocale(lang) {
+			lang = ""
+			changeLang = false
+		}
+
+		//3.Then check from 'Accept-Language' header.
+		if len(lang) == 0 {
+			tags, _, _ := language.ParseAcceptLanguage(ctx.Request().Header.Get("Accept-Language"))
+			lang = i18n.Locales.MatchTag(tags)
+		}
+
+		if changeLang {
+			ctx.SetCookie(&http.Cookie{Name: "lang", Value: lang, Path: "/", MaxAge: 1<<31 - 1})
+		}
+
+		localeUsed, err := i18n.Locales.GetLocale(lang)
+		if err != nil {
+			return errorRes(500, "Cannot get locale", err)
+		}
+
+		setData(ctx, "localeName", localeUsed.Name)
+		setData(ctx, "locale", localeUsed)
+		setData(ctx, "allLocales", i18n.Locales.Locales)
+
+		return next(ctx)
+	}
+}
+
 func sessionInit(next echo.HandlerFunc) echo.HandlerFunc {
 	return func(ctx echo.Context) error {
 		sess := getSession(ctx)

internal/web/util.go

@@ -12,6 +12,7 @@ import (
 	"github.com/labstack/echo/v4"
 	"github.com/thomiceli/opengist/internal/config"
 	"github.com/thomiceli/opengist/internal/db"
+	"github.com/thomiceli/opengist/internal/i18n"
 	"golang.org/x/crypto/argon2"
 	"html/template"
 	"net/http"
@@ -212,11 +213,11 @@ func paginate[T any](ctx echo.Context, data []*T, pageInt int, perPage int, temp
 
 	switch labels {
 	case 1:
-		setData(ctx, "prevLabel", "Previous")
-		setData(ctx, "nextLabel", "Next")
+		setData(ctx, "prevLabel", tr(ctx, "pagination.previous"))
+		setData(ctx, "nextLabel", tr(ctx, "pagination.next"))
 	case 2:
-		setData(ctx, "prevLabel", "Newer")
-		setData(ctx, "nextLabel", "Older")
+		setData(ctx, "prevLabel", tr(ctx, "pagination.newer"))
+		setData(ctx, "nextLabel", tr(ctx, "pagination.older"))
 	}
 
 	setData(ctx, "urlPage", urlPage)
@@ -224,6 +225,11 @@ func paginate[T any](ctx echo.Context, data []*T, pageInt int, perPage int, temp
 	return nil
 }
 
+func tr(ctx echo.Context, key string) template.HTML {
+	l := getData(ctx, "locale").(*i18n.Locale)
+	return l.Tr(key)
+}
+
 type Argon2ID struct {
 	format  string
 	version int