fix issues on examdraft view and event print page

app/Controllers/View/FilesController.php

@@ -224,6 +224,10 @@ class FilesController extends Controller
             throw PageNotFoundException::forPageNotFound();
         }
 
+        if (!$this->canAccessExamDraftFile($name, $subdir)) {
+            return $this->response->setStatusCode(403, 'You are not allowed to access this file.');
+        }
+
         $mime = 'application/octet-stream';
         if (function_exists('finfo_open')) {
             $fi = finfo_open(FILEINFO_MIME_TYPE);
@@ -317,4 +321,53 @@ class FilesController extends Controller
         }
         return 'teacher_file';
     }
+
+    private function canAccessExamDraftFile(string $filename, string $subdir): bool
+    {
+        $userId = (int) (session()->get('user_id') ?? 0);
+        if ($userId <= 0) {
+            return false;
+        }
+
+        $role = strtolower((string) (session()->get('role') ?? ''));
+        if ($role === 'admin') {
+            return true;
+        }
+
+        $db = Database::connect();
+        $fileColumn = $subdir === 'finals' ? 'final_file' : $this->resolveExamDraftFileColumn($db);
+
+        $draft = $db->table('exam_drafts ed')
+            ->select('ed.class_section_id, ed.school_year, ed.teacher_id, ed.author_id')
+            ->where('ed.' . $fileColumn, $filename)
+            ->limit(1)
+            ->get()
+            ->getRowArray();
+
+        if (empty($draft)) {
+            return false;
+        }
+
+        $authorId = (int) ($draft['teacher_id'] ?? $draft['author_id'] ?? 0);
+        if ($authorId > 0 && $authorId === $userId) {
+            return true;
+        }
+
+        $classSectionId = (int) ($draft['class_section_id'] ?? 0);
+        if ($classSectionId <= 0) {
+            return false;
+        }
+
+        $assignmentQuery = $db->table('teacher_class')
+            ->select('id')
+            ->where('teacher_id', $userId)
+            ->where('class_section_id', $classSectionId);
+
+        $schoolYear = trim((string) ($draft['school_year'] ?? ''));
+        if ($schoolYear !== '') {
+            $assignmentQuery->where('school_year', $schoolYear);
+        }
+
+        return $assignmentQuery->limit(1)->countAllResults() > 0;
+    }
 }