More type hinting

lib/Artwork.php

@@ -72,18 +72,28 @@ class Artwork extends PropertiesBase{
 		return $this->_UrlName;
 	}
 
-	protected function GetSubmitter(): User{
+	protected function GetSubmitter(): ?User{
 		if($this->_Submitter === null){
+			try{
 				$this->_Submitter = User::Get($this->SubmitterUserId);
 			}
+			catch(Exceptions\InvalidUserException){
+				// Return null
+			}
+		}
 
 		return $this->_Submitter;
 	}
 
-	protected function GetReviewer(): User{
+	protected function GetReviewer(): ?User{
 		if($this->_Reviewer === null){
+			try{
 				$this->_Reviewer = User::Get($this->ReviewerUserId);
 			}
+			catch(Exceptions\InvalidUserException){
+				// Return null
+			}
+		}
 
 		return $this->_Reviewer;
 	}

lib/Exceptions/InvalidLoginException.php

@@ -0,0 +1,6 @@
+<?
+namespace Exceptions;
+
+class InvalidLoginException extends AppException{
+	protected $message = 'We couldn’t validate your login information.';
+}

lib/Exceptions/InvalidUserException.php

@@ -2,5 +2,5 @@
 namespace Exceptions;
 
 class InvalidUserException extends AppException{
-	protected $message = 'We couldn’t validate your login information.';
+	protected $message = 'We couldn’t locate that user.';
 }

lib/Session.php

@@ -1,4 +1,6 @@
 <?
+
+use Exceptions\InvalidLoginException;
 use Ramsey\Uuid\Uuid;
 use Safe\DateTime;
 use function Safe\strtotime;
@@ -33,6 +35,7 @@ class Session extends PropertiesBase{
 	// *******
 
 	public function Create(?string $email = null, ?string $password = null): void{
+		try{
 			$this->User = User::GetIfRegistered($email, $password);
 			$this->UserId = $this->User->UserId;
 
@@ -61,6 +64,10 @@ class Session extends PropertiesBase{
 
 			self::SetSessionCookie($this->SessionId);
 		}
+		catch(Exceptions\InvalidUserException){
+			throw new InvalidLoginException();
+		}
+	}
 
 	public static function GetLoggedInUser(): ?User{
 		$sessionId = HttpInput::Str(COOKIE, 'sessionid');

lib/User.php

@@ -114,6 +114,10 @@ class User extends PropertiesBase{
 	// ***********
 
 	public static function Get(?int $userId): User{
+		if($userId === null){
+			throw new Exceptions\InvalidUserException();
+		}
+
 		$result = Db::Query('
 					SELECT *
 					from Users

www/artworks/get.php

@@ -82,7 +82,7 @@ catch(Exceptions\ArtworkNotFoundException){
 			<? if($isAdminView){ ?>
 				<tr>
 					<td>Submitted by</td>
-					<td><? if($artwork->SubmitterUserId === null){ ?>Anonymous<? }else{ ?><a href="mailto:<?= Formatter::ToPlainText($artwork->Submitter->Email) ?>"><? if($artwork->Submitter->Name !== null){ ?> <?= Formatter::ToPlainText($artwork->Submitter->Name) ?><? }else{ ?><?= Formatter::ToPlainText($artwork->Submitter->Email) ?><? } ?></a><? } ?></td>
+					<td><? if($artwork->Submitter === null){ ?>Anonymous<? }else{ ?><a href="mailto:<?= Formatter::ToPlainText($artwork->Submitter->Email) ?>"><? if($artwork->Submitter->Name !== null){ ?> <?= Formatter::ToPlainText($artwork->Submitter->Name) ?><? }else{ ?><?= Formatter::ToPlainText($artwork->Submitter->Email) ?><? } ?></a><? } ?></td>
 				</tr>
 				<? if($artwork->Reviewer !== null){ ?>
 					<tr>