In newcommer greeting treat space-char-only first_name or last_name as non-existing

lib/TelegramBot.pm

@@ -126,17 +126,22 @@ sub __on_msg {
 		foreach my $member (@{$msg->new_chat_members}) {
 			my $member_str = '';
 
-			if ($member->can ('first_name') && defined ($member->first_name)) {
+			# avoid naming people by spacing symbols, or empty names
+			if ($member->can ('first_name') && defined ($member->first_name) && $member->first_name !~ /^\s+$/ui) {
 				$member_str .= $member->first_name;
 
-				if ($member->can ('last_name') && defined ($member->last_name)) {
+				if ($member->can ('last_name') && defined ($member->last_name) && $member->last_name !~ /^\s+$/ui) {
 					$member_str .= ' ' . $member->last_name;
 				}
 			} else {
-				if ($member->can ('last_name') && defined ($member->last_name)) {
+				if ($member->can ('last_name') && defined ($member->last_name) && $member->last_name !~ /^\s+$/ui) {
 					$member_str .= ' ' . $member->last_name;
-				} else {
+				# username must be uniq and should contain only english letters and numbers, so...
+				} elsif ($member->can ('username') && defined ($member->username)) {
 					$member_str .= '@' . $member->username;
+				# fallback to id if uose trying to be smartass and use only spacing chars in it's firstname and/or lastname
+				} else {
+					$member_str .= $member->id;
 				}
 			}
 
@@ -269,10 +274,22 @@ sub __on_msg {
 			$log->debug (sprintf ('[DEBUG] In public chat %s (%s) %s quote us!', $chatname, $chatid, $vis_a_vi));
 
 			# do not answer back if someone quote our new member greet
-			if ((substr ($msg->reply_to_message->text, 0, 9) eq 'Дратути, ') &&
+			if (substr ($msg->reply_to_message->text, -61) eq 'Представьтес, пожалуйста, и расскажите, что вас сюда привело.') {
-			    (substr ($msg->reply_to_message->text, -61) eq 'Представьтес, пожалуйста, и расскажите, что вас сюда привело.')) {
+				my @hello = (
+					'Дратути, ',
+					'Дарована, ',
+					'Доброе утро, день или вечер, ',
+					'Добро пожаловать в наше скромное коммунити, ',
+					'Наше вам с кисточкой тут, на канальчике, ',
+				);
+
+				foreach my $hi (@hello) {
+					if (substr ($msg->reply_to_message->text, 0, length $hi) eq $hi) {
 						return;
-			} else {
+					}
+				}
+			}
+
 			# remove our name from users reply, just in case
 			my $pat1 = quotemeta ('@' . $myusername);
 			my $pat2 = quotemeta $myfullname;
@@ -282,7 +299,6 @@ sub __on_msg {
 
 			# figure out reply :)
 			$reply = $hailo->{$msg->chat->id}->learn_reply ($phrase) if (length ($phrase) > 3);
-			}
 		# simple commands
 		} elsif (substr ($text, 0, 1) eq $csign) {
 			$reply = Command ($self, $msg, $text, $chatid);