oidc-demo-app/handlers/index.go

113 lines
3.3 KiB
Go

/*
Copyright 2020, 2021 Jan Dittberner
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 handlers
import (
"context"
"fmt"
"html/template"
"net/http"
"net/url"
"github.com/lestrrat-go/jwx/jwk"
"github.com/nicksnyder/go-i18n/v2/i18n"
"git.cacert.org/oidc_demo_app/services"
)
type indexHandler struct {
bundle *i18n.Bundle
indexTemplate *template.Template
keySet jwk.Set
logoutUrl string
messageCatalog *services.MessageCatalog
serverAddr string
}
func (h *indexHandler) ServeHTTP(writer http.ResponseWriter, request *http.Request) {
if request.Method != http.MethodGet {
http.Error(writer, http.StatusText(http.StatusMethodNotAllowed), http.StatusMethodNotAllowed)
return
}
if request.URL.Path != "/" {
http.NotFound(writer, request)
return
}
accept := request.Header.Get("Accept-Language")
localizer := i18n.NewLocalizer(h.bundle, accept)
writer.WriteHeader(http.StatusOK)
session, err := services.GetSessionStore().Get(request, sessionName)
if err != nil {
http.Error(writer, err.Error(), http.StatusInternalServerError)
return
}
logoutUrl, err := url.Parse(h.logoutUrl)
if err != nil {
http.Error(writer, err.Error(), http.StatusInternalServerError)
return
}
var idToken string
var ok bool
if idToken, ok = session.Values[sessionKeyIdToken].(string); ok {
logoutUrl.RawQuery = url.Values{
"id_token_hint": []string{idToken},
"post_logout_redirect_uri": []string{fmt.Sprintf("https://%s/after-logout", h.serverAddr)},
}.Encode()
} else {
return
}
oidcToken, err := ParseIdToken(idToken, h.keySet)
if err != nil {
http.Error(writer, err.Error(), http.StatusInternalServerError)
return
}
writer.Header().Add("Content-Type", "text/html")
err = h.indexTemplate.Lookup("base").Execute(writer, map[string]interface{}{
"Title": h.messageCatalog.LookupMessage("IndexTitle", nil, localizer),
"Greeting": h.messageCatalog.LookupMessage("IndexGreeting", map[string]interface{}{
"User": oidcToken.Name(),
}, localizer),
"IntroductionText": h.messageCatalog.LookupMessage("IndexIntroductionText", nil, localizer),
"LogoutLabel": h.messageCatalog.LookupMessage("LogoutLabel", nil, localizer),
"LogoutURL": logoutUrl.String(),
})
if err != nil {
http.Error(writer, err.Error(), http.StatusInternalServerError)
return
}
}
func NewIndexHandler(ctx context.Context, serverAddr string) (*indexHandler, error) {
indexTemplate, err := template.ParseFiles(
"templates/base.gohtml", "templates/index.gohtml")
if err != nil {
return nil, err
}
return &indexHandler{
bundle: services.GetI18nBundle(ctx),
indexTemplate: indexTemplate,
keySet: services.GetJwkSet(ctx),
logoutUrl: services.GetOidcConfig(ctx).EndSessionEndpoint,
messageCatalog: services.GetMessageCatalog(ctx),
serverAddr: serverAddr,
}, nil
}