Don't send notification if user is liking or replying to his own post

src/models/posts/queries.rs

@@ -190,7 +190,9 @@ pub async fn create_post(
     if let Some(in_reply_to_id) = &db_post.in_reply_to_id {
         update_reply_count(&transaction, in_reply_to_id, 1).await?;
         let in_reply_to = get_post_by_id(&transaction, in_reply_to_id).await?;
-        if in_reply_to.author.is_local() {
+        if in_reply_to.author.is_local() &&
+            in_reply_to.author.id != db_post.author_id
+        {
             create_reply_notification(
                 &transaction,
                 &db_post.author_id,

src/models/reactions/queries.rs

@@ -22,7 +22,7 @@ pub async fn create_reaction(
     ).await.map_err(catch_unique_violation("reaction"))?;
     update_reaction_count(&transaction, post_id, 1).await?;
     let post = get_post_by_id(&transaction, post_id).await?;
-    if post.author.is_local() {
+    if post.author.is_local() && post.author.id != *author_id {
         create_reaction_notification(
             &transaction,
             author_id,

src/models/users/types.rs

@@ -54,6 +54,7 @@ pub struct UserCreateData {
 }
 
 fn validate_username(username: &str) -> Result<(), ValidationError> {
+    // The username regexp should not allow domain names and IP addresses
     let username_regexp = Regex::new(r"^[a-z0-9_]+$").unwrap();
     if !username_regexp.is_match(username) {
         return Err(ValidationError("invalid username"));