// RequestAlias handles the situation when a client sends a RequestAlias message
func RequestAlias(message messages.RequestAliasMessage, conn *connection.Conn, al map[string]bool) {
serverlog.General("Received RequestAlias message from", conn.Identification())
if conn.Registered {
serverlog.General(conn.Identification(), "attempted to request new alias:", message.Alias)
denied := messages.NewAliasDeniedMessage("Already registered with alias: " + conn.Alias)
conn.Write(denied.Bytes())
return
}
if _, ok := al[message.Alias]; ok {
serverlog.General(conn.Identification(), "requested existing alias:", message.Alias)
denied := messages.NewAliasDeniedMessage("That alias is taken")
conn.Write(denied.Bytes())
return
}
if len(message.Alias) < 3 || len(message.Alias) > 10 {
serverlog.General(conn.Identification(), "requested too long or too short alias:", message.Alias)
denied := messages.NewAliasDeniedMessage("An alias needs to be between 3 and 10 characters long (inclusive)")
conn.Write(denied.Bytes())
return
}
serverlog.General("Successful registration under alias:", message.Alias)
conn.Alias = message.Alias
conn.Registered = true
serverlog.General("Adding:", message.Alias, "to takenAliases map")
al[message.Alias] = true
approved := messages.NewAliasApprovedMessage()
conn.Write(approved.Bytes())
}
