fix: combine the chunks

Author: Soare-Robert-Daniel

inc/files.php

@@ -205,9 +205,11 @@ function ppom_upload_file() {
 	$file_path_thumb = $file_dir_path . 'thumbs';
 	$file_name       = wp_unique_filename( $file_path_thumb, $file_name );
 	$file_name       = strtolower( $file_name );
+	$original_name   = $file_name;
 	$file_ext        = pathinfo( $file_name, PATHINFO_EXTENSION );
+	$original_name   = str_replace(".$file_ext", "", $original_name);
 	$unique_hash     = substr( hash( 'sha256', wp_generate_password( 8, false, false ) ), 0, 8 );
-	$file_name       = str_replace( ".$file_ext", ".$unique_hash.$file_ext", $file_name );
+	$file_name       = str_replace( ".$file_ext", "." . $chunk . ".$unique_hash.$file_ext", $file_name );
 	$file_path       = $file_dir_path . $file_name;
 
 	// Make sure the fileName is unique but only if chunking is disabled
@@ -299,7 +301,45 @@ function ppom_upload_file() {
 	}
 
 	// Check if file has been uploaded
-	if ( ! $chunks || $chunk == $chunks - 1 ) {
+	if ( ! $chunks || $chunk === $chunks - 1 ) {
+		
+		// Gather all the chunks and combine them into a single file.
+		$final_file = fopen($file_path, 'wb');
+        if ( $final_file ) {
+			$chunks_files_path = [];
+            $dir = opendir($file_dir_path);
+            if ($dir) {
+                while (($file = readdir($dir)) !== false) {
+                    $tmpfilePath = $file_dir_path . $file;
+					
+                    if ( false !== strpos($tmpfilePath, $original_name) && false !== strpos($tmpfilePath, '.part')) {
+						$chunks_files_path[] = $tmpfilePath;
+                    }
+                }
+                closedir($dir);
+            }
+			
+			sort( $chunks_files_path );
+
+			foreach( $chunks_files_path as $tmpfilePath ) {
+				$chunk_file = fopen($tmpfilePath, 'rb');
+				if ($chunk_file) {
+					while ($buffer = fread($chunk_file, 4096)) {
+						fwrite($final_file, $buffer);
+					}
+					fclose($chunk_file);
+					// Optionally, you can delete the chunk file after appending it to the final file
+					unlink($tmpfilePath);
+				} else {
+					die('{"jsonrpc" : "2.0", "error" : {"code": 103, "message": "Failed to open chunk file."}, "id" : "id"}');
+				}
+			}
+
+            fclose($final_file);
+        } else {
+            die('{"jsonrpc" : "2.0", "error" : {"code": 104, "message": "Failed to open final file."}, "id" : "id"}');
+        }
+
 		// Strip the temp .part suffix off
 		rename( "{$file_path}.part", $file_path );