add in config variable for redis sessions

data/config.example.json

@@ -13,7 +13,8 @@
   },
   "server_config": {
     "port": 8080,
-    "base_url": "https://profile.example.com"
+    "base_url": "https://profile.example.com",
+    "session_store": "redis"
   },
   "email_config": {
     "username": "noreply",

src/main/config.go

@@ -24,6 +24,7 @@ type StyleConfig struct {
 type WebserverConfig struct {
 	Port         int    `json:"port"`
 	BaseURL      string `json:"base_url"`
+	SessionStore string `json:"session_store"`
 }
 
 type EmailConfig struct {

src/main/main.go

@@ -221,8 +221,6 @@ func changePasswordHandler(w http.ResponseWriter, r *http.Request) {
 
 func main() {
 	logging.Info("Starting the server")
-	sessionManager = session.GetSessionManager()
-	sessionManager.SetStoreType(session.Redis)
 
 	var err error
 	serverConfig, err = loadServerConfig("./data/config.json")
@@ -230,6 +228,16 @@ func main() {
 		log.Fatal("Could not load server config")
 	}
 
+	sessionManager = session.GetSessionManager()
+	if serverConfig.WebserverConfig.SessionStore == "in_memory" {
+		sessionManager.SetStoreType(session.InMemory)
+	} else if serverConfig.WebserverConfig.SessionStore == "redis" {
+		sessionManager.SetStoreType(session.Redis)
+	} else {
+		logging.Warnf("'%s' is an unknown session store type defaulting to in memory", serverConfig.WebserverConfig.SessionStore)
+		sessionManager.SetStoreType(session.InMemory)
+	}
+
 	noReplyEmail = email.CreateEmailAccount(email.EmailAccountData{
 		Username: serverConfig.EmailConfig.Username,
 		Password: serverConfig.EmailConfig.Password,