[chore] status dereferencing improvements (#3255)

* search for mentions also by username,domain in status deref, handle deleted statuses in enrichStatusSafely()

* return d.enrichStatusSafely() directly

internal/gtsmodel/mention.go

@@ -49,15 +49,16 @@ type Mention struct {
 	//
 	// This will not be put in the database, it's just for convenience.
 	NameString string `bun:"-"`
+
 	// TargetAccountURI is the AP ID (uri) of the user mentioned.
 	//
 	// This will not be put in the database, it's just for convenience.
 	TargetAccountURI string `bun:"-"`
+
 	// TargetAccountURL is the web url of the user mentioned.
 	//
 	// This will not be put in the database, it's just for convenience.
 	TargetAccountURL string `bun:"-"`
-	// A pointer to the gtsmodel account of the mentioned account.
 }
 
 // ParseMentionFunc describes a function that takes a lowercase account namestring

internal/gtsmodel/status.go

@@ -184,6 +184,35 @@ func (s *Status) GetMentionByTargetURI(uri string) (*Mention, bool) {
 	return nil, false
 }
 
+// GetMentionByUsernameDomain fetches the Mention associated with given
+// username and domains, typically extracted from a mention Namestring.
+func (s *Status) GetMentionByUsernameDomain(username, domain string) (*Mention, bool) {
+	for _, mention := range s.Mentions {
+
+		// We can only check if target
+		// account is set on the mention.
+		account := mention.TargetAccount
+		if account == nil {
+			continue
+		}
+
+		// Usernames must always match.
+		if account.Username != username {
+			continue
+		}
+
+		// Finally, either domains must
+		// match or an empty domain may
+		// be permitted if account local.
+		if account.Domain == domain ||
+			(domain == "" && account.IsLocal()) {
+			return mention, true
+		}
+	}
+
+	return nil, false
+}
+
 // GetTagByName searches status for Tag{} with name.
 func (s *Status) GetTagByName(name string) (*Tag, bool) {
 	for _, tag := range s.Tags {