Add /preview/* routes

scnserver/models/user.go

@@ -116,6 +116,13 @@ func (u User) MaxTimestampDiffHours() int {
 	return 24
 }
 
+func (u User) JSONPreview() UserPreviewJSON {
+	return UserPreviewJSON{
+		UserID:   u.UserID,
+		Username: u.Username,
+	}
+}
+
 type UserJSON struct {
 	UserID                      UserID  `json:"user_id"`
 	Username                    *string `json:"username"`
@@ -137,6 +144,11 @@ type UserJSON struct {
 	MaxUserMessageIDLength      int     `json:"max_user_message_id_length"`
 }
 
+type UserPreviewJSON struct {
+	UserID   UserID  `json:"user_id"`
+	Username *string `json:"username"`
+}
+
 type UserJSONWithClientsAndKeys struct {
 	UserJSON
 	Clients  []ClientJSON `json:"clients"`