Add default value to AllowCorsFrom setting

api/context.go

@@ -166,8 +166,8 @@ func (h handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		// All api response bodies will be JSON formatted by default
 		w.Header().Set("Content-Type", "application/json")
 
-		if len(utils.Cfg.ServiceSettings.AllowCorsFrom) > 0 {
+		if len(*utils.Cfg.ServiceSettings.AllowCorsFrom) > 0 {
-			w.Header().Set("Access-Control-Allow-Origin", utils.Cfg.ServiceSettings.AllowCorsFrom)
+			w.Header().Set("Access-Control-Allow-Origin", *utils.Cfg.ServiceSettings.AllowCorsFrom)
 		}
 
 		if r.Method == "GET" {

model/config.go

@@ -39,7 +39,7 @@ type ServiceSettings struct {
 	EnableDeveloper                   *bool
 	EnableSecurityFixAlert            *bool
 	EnableInsecureOutgoingConnections *bool
-	AllowCorsFrom                     string
+	AllowCorsFrom                     *string
 	SessionLengthWebInDays            *int
 	SessionLengthMobileInDays         *int
 	SessionLengthSSOInDays            *int
@@ -378,6 +378,11 @@ func (o *Config) SetDefaults() {
 		o.ServiceSettings.WebsocketSecurePort = new(int)
 		*o.ServiceSettings.WebsocketSecurePort = 443
 	}
+
+	if o.ServiceSettings.AllowCorsFrom == nil {
+		o.ServiceSettings.AllowCorsFrom = new(string)
+		*o.ServiceSettings.AllowCorsFrom = ""
+	}
 }
 
 func (o *Config) IsValid() *AppError {

utils/config.go

@@ -236,7 +236,7 @@ func getClientConfig(c *model.Config) map[string]string {
 	props["WebsocketPort"] = fmt.Sprintf("%v", *c.ServiceSettings.WebsocketPort)
 	props["WebsocketSecurePort"] = fmt.Sprintf("%v", *c.ServiceSettings.WebsocketSecurePort)
 
-	props["AllowCorsFrom"] = c.ServiceSettings.AllowCorsFrom
+	props["AllowCorsFrom"] = *c.ServiceSettings.AllowCorsFrom
 
 	return props
 }