send emails

utils/email.go

@@ -1,5 +1,10 @@
 package utils
 
+// MTA is mail transfer agent
+type MTA interface {
+	Send(from, to, data string) error
+}
+
 // Email object
 type Email struct {
 	MessageID string

utils/matrix.go

@@ -26,6 +26,45 @@ func RelatesTo(noThreads bool, parentID id.EventID) *event.RelatesTo {
 	}
 }
 
+// EventParent returns parent event - either thread ID or reply-to ID
+func EventParent(currentID id.EventID, content *event.MessageEventContent) id.EventID {
+	if content == nil {
+		return currentID
+	}
+
+	if content.GetRelatesTo() == nil {
+		return currentID
+	}
+
+	threadParent := content.RelatesTo.GetThreadParent()
+	if threadParent != "" {
+		return threadParent
+	}
+
+	replyParent := content.RelatesTo.GetReplyTo()
+	if replyParent != "" {
+		return replyParent
+	}
+
+	return currentID
+}
+
+// EventField returns field value from raw event content
+func EventField[T comparable](content *event.Content, field string) T {
+	var zero T
+	raw := content.Raw[field]
+	if raw == nil {
+		return zero
+	}
+
+	v, ok := raw.(T)
+	if !ok {
+		return zero
+	}
+
+	return v
+}
+
 // UnwrapError tries to unwrap a error into something meaningful, like mautrix.HTTPError or mautrix.RespError
 func UnwrapError(err error) error {
 	switch err.(type) {