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Martin Tranberg 7fab89cbbb Ret tre fejl i download_sharepoint.py og tilføj CLAUDE.md

- force_refresh sendes nu korrekt til MSAL så token-cache omgås ved 401
- safe_get bruges ved download-retry efter URL-refresh for at få exponential backoff
- CSV DictWriter genbruges i stedet for at oprette to separate instanser

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-03-27 14:27:12 +01:00

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CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Project Overview

A Python utility that synchronizes SharePoint Online folders to local storage using the Microsoft Graph API. Offers both a CLI (download_sharepoint.py) and a modern GUI (sharepoint_gui.py).

Running the Tool

# Install dependencies
pip install -r requirements.txt

# GUI mode (recommended for interactive use)
python sharepoint_gui.py

# CLI mode (for automation/scripting)
python download_sharepoint.py

Configuration is read from connection_info.txt (gitignored — copy from connection_info.template.txt and fill in credentials).

Architecture

Two-file structure with clear separation of concerns:

download_sharepoint.py — Core engine with four logical layers:

Authentication — MSAL ConfidentialClientApplication using OAuth 2.0 Client Credentials flow. Tokens are refreshed via force_refresh=True when a 401 is received.
Graph API navigation — get_site_id() → get_drive_id() → process_item_list() (recursive, handles @odata.nextLink pagination).
Download & resilience — download_single_file() with Range header support for resumable downloads. get_fresh_download_url() handles expired pre-signed URLs. The @retry_request decorator provides exponential backoff (up to 5 retries, 2^n seconds) for 429s and network errors.
Concurrency — ThreadPoolExecutor (max 5 workers). A report_lock guards the shared error list. A stop_event allows the GUI stop button to cancel in-flight work.

sharepoint_gui.py — CustomTkinter wrapper that:

Persists settings to a local JSON file
Spawns the core engine in a background thread
Patches requests.get to route through the GUI's log display
Provides a folder browser for LOCAL_PATH

Key Behaviors to Preserve

Self-healing sessions: On 401, the code refreshes both the MSAL access token and the pre-signed Graph download URL before retrying — these are two separate expiry mechanisms.
Resumable downloads: Files are downloaded in 1 MB chunks using HTTP Range headers. Existing files are skipped if their size matches; partial files are resumed from the last byte.
Stop signal: stop_event.is_set() is checked in the download loop and recursive traversal — any new code that loops must respect this.

Output

sharepoint_download.log — Full operation log
download_report_YYYYMMDD_HHMMSS.csv — Per-run error report (gitignored)

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