Gazelle/sections/artist/add_alias.php

<?
authorize();

if(!check_perms('torrents_edit')) { error(403); }
$ArtistID = $_POST['artistid'];
$Redirect = $_POST['redirect'];
$AliasName = normalise_artist_name($_POST['name']);
$DBAliasName = db_string($AliasName);
if(!$Redirect) { $Redirect = 0; }

if(!is_number($ArtistID) || !($Redirect === 0 || is_number($Redirect)) || !$ArtistID) {
	error(0);
}

if($AliasName == '') {
	error('Blank artist name.');
}

/*
 * In the case of foo, who released an album before changing his name to bar and releasing another
 * the field shared to make them appear on the same artist page is the ArtistID
 * 1. For a normal artist, there'll be one entry, with the ArtistID, the same name as the artist and a 0 redirect
 * 2. For Celine Dion (C<EFBFBD>line Dion), there's two, same ArtistID, diff Names, one has a redirect to the alias of the first
 * 3. For foo, there's two, same ArtistID, diff names, no redirect
 */

$DB->query("SELECT AliasID, ArtistID, Name, Redirect FROM artists_alias WHERE Name = '".$DBAliasName."'");
if($DB->record_count()) {
	while(list($CloneAliasID, $CloneArtistID, $CloneAliasName, $CloneRedirect) = $DB->next_record(MYSQLI_NUM, false)) {
		if(!strcasecmp($CloneAliasName, $AliasName)) {
			break;
		}
	}
	if($CloneAliasID) {
		if($ArtistID == $CloneArtistID && $Redirect == 0) {
			if($CloneRedirect != 0) {
				$DB->query("UPDATE artists_alias SET ArtistID='".$ArtistID."', Redirect=0 WHERE AliasID='".$CloneAliasID."'");
				write_log("Redirection for the alias $CloneAliasID ($DBAliasName) for the artist $ArtistID was removed by user $LoggedUser[ID] ($LoggedUser[Username])");
			} else {
				error('No changes were made as the target alias did not redirect anywhere.');
			}
		} else {
			error('An alias by that name already exists <a href="artist.php?id='.$CloneArtistID.'">here</a>. You can try renaming that artist to this one.');
		}
	}
}
if(!$CloneAliasID) {
	if($Redirect) {
		$DB->query("SELECT ArtistID, Redirect FROM artists_alias WHERE AliasID = $Redirect");
		if(!$DB->record_count()) {
			error('Cannot redirect to a nonexistent artist alias.');
		}
		list($FoundArtistID, $FoundRedirect) = $DB->next_record();
		if($ArtistID != $FoundArtistID) {
			error('Redirection must target an alias for the current artist.');
		}
		if($FoundRedirect != 0) {
			$Redirect = $FoundRedirect;
		}
	}
	$DB->query("INSERT INTO artists_alias(ArtistID, Name, Redirect, UserID)
		VALUES
		(".$ArtistID.", '".$DBAliasName."', ".$Redirect.", ".$LoggedUser['ID'].")");
	$AliasID = $DB->inserted_id();

	$DB->query("SELECT Name FROM artists_group WHERE ArtistID = ".$ArtistID);
	list($ArtistName) = $DB->next_record(MYSQLI_NUM, false);

	write_log("The alias ".$AliasID." (".$DBAliasName.") was added to the artist ".$ArtistID." (".db_string($ArtistName).") by user ".$LoggedUser['ID']." (".$LoggedUser['Username'].")");
}
header('Location: '.$_SERVER['HTTP_REFERER']);
?>