paperlessmanager/CLAUDE.md

CLAUDE.md

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

Project Overview

Paperless Manager is a document automation platform that extends Paperless-NGX. It provides:

• Scanner inbox management with PDF processing (splitting, rotation, barcode detection)
• Email import with attachment extraction
• Rule-based postprocessing (tag, export, send mail)
• OCR via Ollama (vision model)
• Label printing agent with SSE-based job queue

UI labels and comments are in German.

Structure

paperless-backend/    # NestJS API (port 3100)
paperless-frontend/   # React 19 + Ant Design + Vite
docker-compose.yml    # Production (backend + frontend/nginx + MySQL)
.env.example          # All required environment variables

Commands

Backend (in paperless-backend/):

npm run start:dev     # Dev server with watch mode
npm run build         # Compile TypeScript
npm run test          # Jest unit tests
npm run test:e2e      # End-to-end tests
npm run lint          # ESLint with auto-fix

Frontend (in paperless-frontend/):

npm run dev           # Vite dev server (proxies /api to backend)
npm run build         # TypeScript check + Vite build
npm run lint          # ESLint

Backend Architecture

Module Overview

Module	Purpose
auth	JWT (OIDC/Authentik) + API Key guards, permission system
database	TypeORM entities + MySQL config (synchronize: true)
inbox	Scanner document management (list, preview, rotate, split)
paperless	Paperless-NGX REST API client
preprocessing	PDF→images, OCR, QR extraction, task creation
postprocessing	Rule engine: filter conditions → actions
email	IMAP intake, PDF conversion, correspondent mapping
email-download	External email retrieval, ZUGFeRD invoice parsing
barcode	QR/barcode detection, template-based split actions
label-print-agent	SVG label rendering, RxJS-based print job queue + SSE
inbox-postprocessor	Applies edits/splits to PDFs, variable substitution
scanner	chokidar file system watcher for scan directory
settings	Global configuration
user-settings	Per-user SMTP and preferences

Authentication & Permissions

Global guards apply to all routes:

1. JwtOrApiKeyGuard — validates Bearer JWT (OIDC) or X-API-Key header
2. PermissionsGuard — enforces @RequirePermissions() decorator

Decorate controllers/handlers with:

@RequirePermissions(Permission.VIEW_SCANNER)

Permissions map from OIDC groups (PM_Admin, PM_Belege, etc.) to the Permission enum in src/auth/permissions.enum.ts.

Use @Public() to bypass auth guards entirely.

Database

• TypeORM with MySQL 8+, UTF8MB4, synchronize: true (schema auto-migrates)
• 23 entities in src/database/entities/
• JSON columns use transformers to normalize empty arrays/objects to null
• Key entities: InboxDocument, Task, Email, Attachment, Postprocessing, BarcodeTemplate, LabelPrintJob, ApiKey, Setting

Document Processing Pipeline

Preprocessing (preprocessing/document-pipeline.service.ts):

1. PDF → PNG page images (200 DPI via pdf-lib + sharp)
2. QR code extraction from page 1 (jsqr)
3. OCR via Ollama (llava vision model)
4. Auto-generated internal document number (YYYY-000001)
5. DB task entry creation, archive original (GoBD compliance)

Postprocessing (postprocessing/postprocessing.service.ts):

1. Load rules ordered by priority with filter conditions (JSON)
2. Evaluate filters (field operators: eq, contains, in, etc.)
3. Execute actions: tag, update field, send mail, export WebDAV
4. Log results; apply error tag on failure; stop if NoFurther flag set

Inbox Postprocessor (inbox-postprocessor/):

• Applies virtual edits (page deletions, rotations, splits) stored in DB to original PDF
• Resolves variable templates from barcode/task data
• Returns PDF buffer for upload to Paperless-NGX

Label Print Agent

• Uses RxJS Subject (newJob$) to stream print jobs via SSE to connected agents
• Jobs are locked for 5 minutes to prevent race conditions
• SVG templates rendered to PNG via @resvg/resvg-js
• API documented in docs/BACKEND_API.md

Frontend Architecture

• Auth: OIDC flow via oidc-client-ts, AuthContext provides user identity and tokens
• API layer: Axios-based client methods in src/api/ (one file per domain)
• Routing: React Router v7 in src/App.tsx
• Key components: DocumentEditModal, PdfSplitViewer, WysiwygEditor (TipTap), BarcodePositioner
• During dev, Vite proxies /api to localhost:3100

Environment Variables

Key variables (see .env.example for full list):

Variable	Purpose
DB_*	MySQL connection
PAPERLESS_URL, PAPERLESS_TOKEN	Paperless-NGX API
OIDC_ISSUER, OIDC_CLIENT_ID	OIDC provider (Authentik)
OLLAMA_URL, OLLAMA_MODEL	OCR service
SCANNER_WATCH_DIR, SCANNER_ARCHIVE_DIR	File system paths
BELEGNUMMER_GET_URL, BELEGNUMMER_SET_URL	External invoice number API
PORT	Backend port (default 3100)
VITE_API_URL	Override API URL in frontend (dev only)