// factory to create the handler
func RedirectHandler(redisClient *redis.Client, conf *confighelper.Config) func(w http.ResponseWriter, r *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
// debug log
log.WithField("request", r).Debug("redirect request received")
// get the path variable to get the token
vars := mux.Vars(r)
token := vars["token"]
// get the redirection url for this token
url, err := redisClient.HGet(token, "url").Result()
if err != nil && err.Error() != "redis: nil" {
log.WithError(err).Error("error while retrieving the redirection url from redis")
w.WriteHeader(500) // server error
return
} else if url == "" {
// "redis: nil" is the error is the key is not found
log.WithField("token", token).Info("token not found")
w.WriteHeader(404) // not found
return
}
// consider that url in Redis is correct from here
// increment count
count, err := redisClient.HIncrBy(token, "count", 1).Result()
if err != nil {
log.WithError(err).Error("error while incrementing count")
// no server error, we can still redirect the user
}
// redirect
w.Header().Set("Location", url)
// avoid caching the page on the client side to not bias the counts
w.Header().Set("cache-control", "private, max-age=0, no-cache")
w.WriteHeader(301) // moved permanently
log.WithFields(log.Fields{
"token": token,
"count": count,
"url": url}).Info("redirect request served")
}
}
// factory to create the handler
func AdminHandler(redisClient *redis.Client, conf *confighelper.Config) func(w http.ResponseWriter, r *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
// debug log
log.WithField("request", r).Debug("admin request received")
// get the path variable to get the token
vars := mux.Vars(r)
token := vars["token"]
// get the redirection url for this token
value, err := redisClient.HGetAllMap(token).Result()
if err != nil && err.Error() != "redis: nil" {
log.WithError(err).Error("error while retrieving the token infos from redis")
w.WriteHeader(500) // server error
return
} else if value == nil {
// "redis: nil" is the error is the key is not found
log.WithField("token", token).Info("token not found")
w.WriteHeader(404) // not found
return
}
log.WithFields(log.Fields{
"token": token,
"value": value}).Debug("mapped values retrieved")
response := admin_response_body{
Url: value["url"],
CreationTime: value["creationTime"],
Count: value["count"],
}
encoder := json.NewEncoder(w)
encoder.Encode(response)
// avoid caching the page on the client side to not bias the counts
w.Header().Set("cache-control", "private, max-age=0, no-cache")
log.WithField("token", token).Info("admin request served")
}
}