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/
signout.go
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/
signout.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 login
import (
"net/http"
"github.com/google/exposure-notifications-server/pkg/logging"
"github.com/google/exposure-notifications-verification-server/pkg/controller"
"github.com/google/exposure-notifications-verification-server/pkg/database"
)
// HandleSignOut handles session termination. It's possible for a user to
// navigate to this page directly (without auth).
func (c *Controller) HandleSignOut() http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
logger := logging.FromContext(ctx).Named("login.HandleSignOut")
session := controller.SessionFromContext(ctx)
if session == nil {
controller.MissingSession(w, r, c.h)
return
}
flash := controller.Flash(session)
// If a user is currently logged in, update their last revoked check time.
email, err := c.authProvider.EmailAddress(ctx, session)
if err != nil {
logger.Debugw("failed to lookup user by email", "error", err)
} else {
currentUser, err := c.db.FindUserByEmail(email)
if err != nil {
if !database.IsNotFound(err) {
controller.InternalError(w, r, c.h, err)
return
}
}
if currentUser != nil {
// Update the user's last revoked checked time.
if err := c.db.UntouchUserRevokeCheck(currentUser); err != nil {
controller.InternalError(w, r, c.h, err)
return
}
}
}
// Revoke upstream session.
if err := c.authProvider.RevokeSession(ctx, session); err != nil {
// This is just a warning since a user could navigate to /signout without
// an active session.
logger.Debugw("failed to revoke session", "error", err)
}
// Clear all session data, but copy over flashes.
session.Values = make(map[interface{}]interface{})
flash.Clone(session.Values)
m := controller.TemplateMapFromContext(ctx)
m.Title("Logging out...")
m["firebase"] = c.config.Firebase
c.h.RenderHTML(w, "signout", m)
})
}