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index.go
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index.go
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// Copyright 2020 the Exposure Notifications Verification Server 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 redirect
import (
"net"
"net/http"
"strings"
"github.com/google/exposure-notifications-server/pkg/logging"
"github.com/google/exposure-notifications-verification-server/pkg/cache"
"github.com/google/exposure-notifications-verification-server/pkg/controller"
"github.com/google/exposure-notifications-verification-server/pkg/database"
)
func (c *Controller) HandleIndex() http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
logger := logging.FromContext(ctx).Named("redirect.HandleIndex")
// Strip of the port if that was passed along in the host header.
baseHost := strings.ToLower(r.Host)
if host, _, err := net.SplitHostPort(baseHost); err == nil {
baseHost = host
}
hostRegion := ""
for hostname, region := range c.hostnameToRegion {
if hostname == baseHost {
hostRegion = region
break
}
}
if hostRegion == "" {
// If this is a mobile device, redirect into the OS specific picker as a
// best effort.
userAgent := r.UserAgent()
if isAndroid(userAgent) {
http.Redirect(w, r, androidOnboardingRedirect, http.StatusSeeOther)
return
}
if isIOS(userAgent) {
http.Redirect(w, r, iosOnboardingRedirect, http.StatusSeeOther)
return
}
controller.NotFound(w, r, c.h)
return
}
realm, err := c.db.FindRealmByRegion(hostRegion)
if err != nil {
if database.IsNotFound(err) {
controller.NotFound(w, r, c.h)
return
}
controller.InternalError(w, r, c.h, err)
return
}
// Get App Store Data.
var data AppStoreData
cacheKey := &cache.Key{
Namespace: "apps:appstoredata:by_region",
Key: hostRegion,
}
if err := c.cacher.Fetch(ctx, cacheKey, &data, c.config.AppCacheTTL, func() (interface{}, error) {
logger.Debug("fetching new app store data")
return c.getAppStoreData(realm.ID)
}); err != nil {
if database.IsNotFound(err) {
controller.NotFound(w, r, c.h)
return
}
controller.InternalError(w, r, c.h, err)
return
}
if sendto, success := decideRedirect(hostRegion, r.UserAgent(), r.URL, realm.EnableENExpress, data); success {
http.Redirect(w, r, sendto, http.StatusSeeOther)
return
}
logger.Infow("no matching metadata for redirect",
"host", r.Host,
"userAgent", r.UserAgent())
controller.NotFound(w, r, c.h)
return
})
}