7fab89cbbb
- 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>
50 lines
2.5 KiB
Markdown
50 lines
2.5 KiB
Markdown
# CLAUDE.md
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This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
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## Project Overview
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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`).
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## Running the Tool
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```bash
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# Install dependencies
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pip install -r requirements.txt
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# GUI mode (recommended for interactive use)
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python sharepoint_gui.py
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# CLI mode (for automation/scripting)
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python download_sharepoint.py
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```
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Configuration is read from `connection_info.txt` (gitignored — copy from `connection_info.template.txt` and fill in credentials).
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## Architecture
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Two-file structure with clear separation of concerns:
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**`download_sharepoint.py`** — Core engine with four logical layers:
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1. **Authentication** — MSAL `ConfidentialClientApplication` using OAuth 2.0 Client Credentials flow. Tokens are refreshed via `force_refresh=True` when a 401 is received.
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2. **Graph API navigation** — `get_site_id()` → `get_drive_id()` → `process_item_list()` (recursive, handles `@odata.nextLink` pagination).
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3. **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.
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4. **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.
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**`sharepoint_gui.py`** — CustomTkinter wrapper that:
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- Persists settings to a local JSON file
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- Spawns the core engine in a background thread
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- Patches `requests.get` to route through the GUI's log display
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- Provides a folder browser for `LOCAL_PATH`
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## Key Behaviors to Preserve
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- **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.
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- **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.
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- **Stop signal**: `stop_event.is_set()` is checked in the download loop and recursive traversal — any new code that loops must respect this.
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## Output
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- `sharepoint_download.log` — Full operation log
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- `download_report_YYYYMMDD_HHMMSS.csv` — Per-run error report (gitignored)
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