download_work_dir_file.py DOX

Purpose

• Own the download_work_dir_file.py API endpoint.
• This module handles workdir file operations for download work dir file.
• Keep this file-level DOX profile synchronized with download_work_dir_file.py because this directory is intentionally flat.

Ownership

• download_work_dir_file.py owns the runtime implementation.
• download_work_dir_file.py.dox.md owns durable notes about responsibilities, contracts, side effects, and verification for that implementation.
• Classes:
• DownloadFile (ApiHandler)
  • get_methods(cls)
  • async process(self, input: Input, request: Request) -> Output
• Top-level functions:
• stream_file_download(file_source, download_name, chunk_size=...): Create a streaming response for file downloads that shows progress in browser.
• make_disposition(download_name: str) -> str
• resolve_download_path(path: str) -> str: Resolve a requested download path and keep it within the runtime base dir.
• async fetch_file(path)

Runtime Contracts

• HTTP handlers must derive from helpers.api.ApiHandler; WebSocket handlers must derive from helpers.ws.WsHandler.
• Update this file whenever request payloads, authentication or CSRF requirements, response shapes, route side effects, or WebSocket event contracts change.
• DownloadFile is an ApiHandler.
• DownloadFile defines process(...).
• DownloadFile defines get_methods(...).
• Observed side-effect areas: filesystem reads, network calls.
• Imported dependency areas include: api, base64, flask, helpers, helpers.api, io, mimetypes, os, pathlib, urllib.parse.

Key Concepts

• Important called helpers/classes observed in the source: mimetypes.guess_type, Response, quote, Path.resolve, Path, candidate.is_absolute, os.path.getsize, generate, download_name.encode.decode, candidate.resolve, resolve, resolved.relative_to, Exception, file.read, base64.b64encode.decode, file_source.tell, file_source.seek, ValueError, file_path.startswith, runtime.call_development_function.
• Keep request/response, tool, or helper semantics documented here at the same time as source changes.

Work Guidance

• Preserve authentication, CSRF, loopback, and API-key checks unless the endpoint contract explicitly changes.
• Update frontend callers, plugin callers, and tests together when payload shape changes.
• Use helpers.api.Response for non-JSON responses, files, redirects, or status-specific replies.

Verification

• Run endpoint-specific or API/WebSocket tests for changed behavior; smoke-test browser callers when no focused test exists.
• Related tests observed by source search:
  • tests/test_download_toast_regressions.py
  • tests/test_office_canvas_setup.py

Child DOX Index

No child DOX files.