Missing resource cleanup. The image resource created by imagecreatetruecolor() on line 108 is never explicitly destroyed with imagedestroy($image). While PHP will clean this up eventually, it's best practice to explicitly free image resources after use, especially for endpoints that may be called frequently.

Conflicting parameter requirements in Swagger documentation. Both supertask and task parameters are marked as "required" => true (lines 53 and 64), but the actual logic shows they are mutually exclusive - only one is needed, not both. The requirement should be that at least one must be provided. Consider marking both as not required individually and documenting in the descriptions that one of the two must be provided.

Python-style boolean False used in PHP assertion. PHP uses lowercase false. This will cause a fatal error if the code path is ever reached and assertions are enabled, as False is an undefined constant in PHP (unless defined elsewhere).

Inconsistent variable usage in conditional check. Line 122 checks isset($supertask_id) but line 96 uses else if ($supertask_id) which will be truthy even if $supertask_id is 0 or empty string. The logic should be consistent - either use isset() in both places or check for truthiness in both. Additionally, the variable may not be set if neither parameter is provided (which is now only caught by the final else on line 101).

Error message doesn't match the context. The error message says "Invalid file" but this endpoint is about tasks, not files. Should be something like "Invalid task" or "Task not found".

Wrong QueryFilter field. This should use Chunk::TASK_ID instead of Task::TASK_ID since we're filtering chunks by task ID, not tasks. The Chunk model has a TASK_ID field that should be used here.

Missing image output to response body. The function calls imagepng($image) on line 204 which outputs directly to stdout, but doesn't capture this output to the response body. This will likely cause issues with the PSR-7 response handling. Consider using imagepng($image, null) and capturing the output with ob_start()/ob_get_clean(), then writing it to $response->getBody()->write().

Missing validation for required query parameters. Unlike similar endpoints (e.g., getFile.routes.php), this code doesn't check if the required task or supertask parameters exist before accessing them. This will cause PHP notices/warnings if neither parameter is provided. Add validation: if (!isset($request->getQueryParams()['task']) && !isset($request->getQueryParams()['supertask'])) before lines 82-83.

Potential undefined variable usage. If the $supertask_id path is taken (lines 96-100), the variable $task is never defined, but it's used in line 156 within the else block. This will cause an error when accessing a supertask but falling into the non-supertask rendering path. The conditional logic on line 122 should prevent this, but the code structure is fragile and could lead to bugs.

Duplicate code: Lines 129-131 and 135-137 perform identical database queries to fetch chunks. The query on lines 135-137 is redundant and should be removed. The $chunks variable from lines 129-131 should be reused.