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i18n.go
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i18n.go
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// Copyright 2020 Google LLC
//
// 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 middleware
import (
"net/http"
"github.com/google/exposure-notifications-verification-server/internal/i18n"
"github.com/google/exposure-notifications-verification-server/pkg/controller"
"github.com/gorilla/mux"
)
const (
HeaderAcceptLanguage = "Accept-Language"
QueryKeyLanguage = "lang"
)
// ProcessLocale extracts the locale from the various possible locations and
// sets the template translator to the correct language.
//
// This must be called after the template map has been created.
func ProcessLocale(locales *i18n.LocaleMap) mux.MiddlewareFunc {
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
param := r.URL.Query().Get(QueryKeyLanguage)
header := r.Header.Get(HeaderAcceptLanguage)
// Find the "best" language from the given parameters. They are in
// priority order.
m := controller.TemplateMapFromContext(ctx)
m["locale"] = locales.Lookup(param, header)
// Save the template map on the context.
ctx = controller.WithTemplateMap(ctx, m)
r = r.Clone(ctx)
next.ServeHTTP(w, r)
})
}
}