diff --git a/lib/Exceptions/InvalidFileUploadException.php b/lib/Exceptions/InvalidFileUploadException.php
new file mode 100644
index 00000000..30c4ea87
--- /dev/null
+++ b/lib/Exceptions/InvalidFileUploadException.php
@@ -0,0 +1,8 @@
+<?php
+
+namespace Exceptions;
+
+class InvalidFileUploadException extends AppException{
+	/** @var string $message */
+	protected $message = 'Uploaded file is invalid.';
+}
diff --git a/lib/HttpInput.php b/lib/HttpInput.php
index e60340b2..1312b708 100644
--- a/lib/HttpInput.php
+++ b/lib/HttpInput.php
@@ -107,6 +107,30 @@ class HttpInput{
 		return self::GetHttpVar($variable, HttpVariableType::Decimal, $set);
 	}
 
+	public static function Date(HttpVariableSource $set, string $variable): ?DateTimeImmutable{
+		/** @var ?DateTimeImmutable */
+		return self::GetHttpVar($variable, HttpVariableType::DateTime, $set);
+	}
+
+	/**
+	 * Returns the absolute path of the requested file upload, or `null` if there isn't one.
+	 *
+	 * @throws Exceptions\InvalidFileUploadException If there is a file upload present, but the upload somehow failed.
+	 */
+	public static function File(string $variable): ?string{
+		$filePath = null;
+
+		if(isset($_FILES[$variable]) && $_FILES[$variable]['size'] > 0){
+			if(!is_uploaded_file($_FILES[$variable]['tmp_name']) || $_FILES[$variable]['error'] > UPLOAD_ERR_OK){
+				throw new Exceptions\InvalidFileUploadException();
+			}
+
+			$filePath = $_FILES[$variable]['tmp_name'] ?? null;
+		}
+
+		return $filePath;
+	}
+
 	/**
 	* @param string $variable
 	* @return array<string>
diff --git a/lib/HttpVariableType.php b/lib/HttpVariableType.php
index 29ce0a34..2ce585bd 100644
--- a/lib/HttpVariableType.php
+++ b/lib/HttpVariableType.php
@@ -2,6 +2,7 @@
 enum HttpVariableType{
 	case Array;
 	case Boolean;
+	case DateTime;
 	case Decimal;
 	case Integer;
 	case String;
diff --git a/www/artworks/post.php b/www/artworks/post.php
index 4f88cebe..af2046f1 100644
--- a/www/artworks/post.php
+++ b/www/artworks/post.php
@@ -1,4 +1,7 @@
 <?
+
+use Exceptions\InvalidImageUploadException;
+
 try{
 	session_start();
 	$httpMethod = HttpInput::ValidateRequestMethod([HttpMethod::Post, HttpMethod::Patch, HttpMethod::Put]);
@@ -32,17 +35,7 @@ try{
 			$artwork->ReviewerUserId = $GLOBALS['User']->UserId;
 		}
 
-		// Confirm that we have an image and that it came from POST
-		$imagePath = null;
-		if(isset($_FILES['artwork-image']) && $_FILES['artwork-image']['size'] > 0){
-			if(!is_uploaded_file($_FILES['artwork-image']['tmp_name']) || $_FILES['artwork-image']['error'] > UPLOAD_ERR_OK){
-				throw new Exceptions\InvalidImageUploadException();
-			}
-
-			$imagePath = $_FILES['artwork-image']['tmp_name'] ?? null;
-		}
-
-		$artwork->Create($imagePath);
+		$artwork->Create(HttpInput::File('artwork-image'));
 
 		$_SESSION['artwork'] = $artwork;
 		$_SESSION['artwork-created'] = true;
@@ -77,21 +70,7 @@ try{
 			$artwork->Status = $newStatus;
 		}
 
-		// Confirm that we have an image and that it came from POST
-		$imagePath = null;
-		if(isset($_FILES['artwork-image']) && $_FILES['artwork-image']['size'] > 0){
-			if(!is_uploaded_file($_FILES['artwork-image']['tmp_name']) || $_FILES['artwork-image']['error'] > UPLOAD_ERR_OK){
-				throw new Exceptions\InvalidImageUploadException();
-			}
-
-			$imagePath = $_FILES['artwork-image']['tmp_name'] ?? null;
-		}
-		else{
-			// No uploaded file as part of this edit, so retain the MimeType of the original submission.
-			$artwork->MimeType = $originalArtwork->MimeType;
-		}
-
-		$artwork->Save($imagePath);
+		$artwork->Save(HttpInput::File('artwork-image'));
 
 		$_SESSION['artwork'] = $artwork;
 		$_SESSION['artwork-saved'] = true;
@@ -100,7 +79,7 @@ try{
 		header('Location: ' . $artwork->Url);
 	}
 
-	// PATCHing a new artwork
+	// PATCHing an artwork
 	if($httpMethod == HttpMethod::Patch){
 		$artwork = Artwork::GetByUrl(HttpInput::Str(GET, 'artist-url-name'), HttpInput::Str(GET, 'artwork-url-name'));
 
@@ -147,7 +126,13 @@ catch(Exceptions\InvalidPermissionsException){
 catch(Exceptions\ArtworkNotFoundException){
 	Template::Emit404();
 }
-catch(Exceptions\InvalidArtworkException | Exceptions\InvalidArtworkTagException | Exceptions\InvalidArtistException | Exceptions\InvalidImageUploadException | Exceptions\ArtworkNotFoundException $ex){
+catch(Exceptions\InvalidArtworkException | Exceptions\InvalidArtworkTagException | Exceptions\InvalidArtistException | Exceptions\InvalidFileUploadException | Exceptions\ArtworkNotFoundException $ex){
+
+	// If we were passed a more generic file upload exception from `HttpInput`, swap it for a more specific exception to show to the user.
+	if($ex instanceof Exceptions\InvalidFileUploadException){
+		$ex = new InvalidImageUploadException();
+	}
+
 	$_SESSION['artwork'] = $artwork;
 	$_SESSION['exception'] = $ex;