Automatic moderation (#875)

* Automatic moderation

* finish

* modpack fixes

* fix unknown license msg

* fix moderation issues

src/routes/v3/threads.rs

@@ -379,6 +379,7 @@ pub async fn thread_send_message(
         body,
         replying_to,
         private,
+        hide_identity,
         ..
     } = &new_message.body
     {
@@ -394,6 +395,12 @@ pub async fn thread_send_message(
             ));
         }
 
+        if *hide_identity && !user.role.is_mod() {
+            return Err(ApiError::InvalidInput(
+                "You are not allowed to send masked messages!".to_string(),
+            ));
+        }
+
         if let Some(replying_to) = replying_to {
             let thread_message =
                 database::models::ThreadMessage::get((*replying_to).into(), &**pool).await?;