LogicPaper | Document Generation Engine

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Contributing Guide

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📖 Overview

LogicPaper is a high-performance document generation engine designed to automate complex reporting and contract workflows. It merges structured data (Excel/JSON) with Microsoft Office templates (.docx, .pptx) or text-based files (.md, .txt) using an advanced Jinja2-based strategy system.

The application follows an Enterprise Architecture (Hexagonal Architecture), utilizing FastAPI for high-concurrency requests, Redis for state management, and LibreOffice Headless for reliable PDF conversion.

🖼️ System Preview

Dashboard Interface

Drag & Drop interface with real-time process logs.

Documentation & Help

Built-in guide for templating syntax.

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🌟 Key Features

• Asynchronous Batch Processing: Handles large datasets via background workers to prevent request timeouts.
• Multi-Format Support: Native rendering for Word, PowerPoint, Markdown, and Plain Text.
• Enterprise Integration API: Dedicated headless endpoints with X-API-Key authentication for ERP/CRM integration.
• State Persistence: Job tracking and session management powered by Redis.
• Complex Formatting Strategies: Custom filters for text manipulation, date arithmetic, localized currency, and conditional logic.
• Dynamic Asset Management: Automatic extraction, insertion, and resizing of images from ZIP archives.
• PDF Engine: Integrated LibreOffice for high-fidelity conversion of Office documents to PDF.

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⚡ Example

See how LogicPaper transforms raw data into professional documents instantly.

1. Input Data (JSON)

This is the mock data feeding the system:

{
    "id": "CORP-001",
    "company": "Acme Solutions Inc.",
    "founded_date": "1998-05-12",
    "revenue_q4": "1500000.00",
    "is_public": "TRUE",
    "compliance_check": "FALSE",
    "auth_sig": "sig_valid.png"
}

2. Visual Result (Before & After)

Template (Input)	Generated Document (Output)
Model with Jinja2 Tags	Rendered PDF with Data
📄 View Template PDF	📃 View Result PDF

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🔄 System Architecture

LogicPaper follows Hexagonal Architecture (Ports and Adapters) principles, ensuring clean separation of concerns and testability.

graph TD
    Client[Web Dashboard / API Client] -->|HTTP/JSON| FastAPI[FastAPI Web Server]
    FastAPI -->|Enqueue Job| Worker[Background Worker]
    Worker -->|State Management| Redis[(Redis State Store)]
    Worker -->|Orchestration| Core[Batch Processing Core]
    Core -->|Validation| Validator[Template Validator]
    Core -->|Formatting| Strategies[Strategy Modules]
    Core -->|Conversion| LibreOffice[LibreOffice Headless]
    Worker -->|I/O Operations| Storage[/File System Adapter/]

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🛠️ Project Structure

LogicPaper/
├── app/
│   ├── core/                      # Domain Layer (Pure Business Logic)
│   │   ├── config.py              # Application Configuration (Pydantic Settings)
│   │   ├── engine.py              # Document Rendering Engine
│   │   ├── formatter.py           # Strategy Registry & Jinja2 Bridge
│   │   ├── ports.py               # Abstract Interfaces (Ports)
│   │   ├── service.py             # Batch Processing Orchestration
│   │   ├── validator.py           # Template-Data Compatibility Checker
│   │   ├── reporter.py            # Excel Report Generation
│   │   └── strategies/            # Formatting Strategies (Strategy Pattern)
│   │       ├── base.py            # Abstract Strategy Interface
│   │       ├── string_std.py      # Text Manipulation
│   │       ├── number_std.py      # Number & Currency Formatting
│   │       ├── date_std.py        # Date/Time Operations
│   │       ├── boolean_std.py     # Boolean Conversion
│   │       ├── logic_std.py       # Conditional Logic
│   │       ├── mask_std.py        # Data Privacy Masking
│   │       └── image_std.py       # Image Dimension Parsing
│   │
│   ├── integration/               # Infrastructure & Presentation Layers
│   │   ├── infrastructure.py      # Adapters (FileSystem, LibreOffice)
│   │   ├── state.py               # Redis Job Repository
│   │   ├── router.py              # Headless API Endpoints
│   │   ├── dashboard_router.py    # Web UI API Endpoints
│   │   ├── worker.py              # Background Job Processors
│   │   ├── schemas.py             # Pydantic Request/Response Models
│   │   ├── security.py            # API Key Authentication
│   │   └── sse.py                 # Server-Sent Events (Real-time Logs)
│   │
│   ├── dependencies.py            # Dependency Injection Container
│   ├── main.py                    # FastAPI Application Entry Point
│   └── utils.py                   # Shared Utilities & Schedulers
│
├── static/                        # Frontend UI (HTML/CSS/JS)
│   ├── index.html                 # Main Dashboard
│   ├── help.html                  # Documentation Page
│   └── assets/                    # CSS, JS, Images
│
├── persistent_templates/          # Template Library for API Access
├── data/                          # Docker Volume (Temporary Files)
├── Dockerfile                     # Container Image Definition
├── docker-compose.yml             # Multi-Container Orchestration
└── .env                           # Environment Configuration

Key Design Patterns

• Hexagonal Architecture: Clean separation between domain and infrastructure
• Dependency Injection: FastAPI's DI system for loose coupling
• Strategy Pattern: Extensible formatting operations
• Repository Pattern: Abstract data persistence via ports
• Adapter Pattern: Infrastructure implementations of domain ports

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🚀 Quick Start

Prerequisites

• Docker Desktop (20.10+)
• Docker Compose

Installation & Deployment

1. Clone the Repository

   git clone https://github.com/rubensbraz/LogicPaper.git
   cd LogicPaper

2. Configure Environment Create a .env file based on the provided configuration (ensure LOGICPAPER_API_KEY is set).

3. Start Services

   docker-compose up --build

4. Access

   • UI Dashboard: http://localhost:8000

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💻 API Integration

LogicPaper provides a dedicated integration layer for external systems.

• Documentation: http://localhost:8000/docs (Interactive Swagger UI)
• Authentication: X-API-Key header.
• Workflow: Submit a JSON payload with data and template path; receive a job_id to poll for status and download the result.
• Asset Support: Optional assets_base64 field to provide a ZIP of images for dynamic replacement.

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📘 Templating Syntax

LogicPaper uses the pipe character (|) to apply formatting filters to variables. For a complete list of filters, refer to the "How to Use" section in the application (Documentation in Github Pages).

1. Text Formatting

{{ client_name | format_string('upper') }}         -> "ACME CORP"
{{ client_id | format_string('prefix', 'ID: ') }}  -> "ID: 12345"

2. Numbers & Currency

{{ contract_value | format_number('currency', 'USD') }}  -> "$ 1,500.00"
{{ tax_rate | format_number('percent') }}                -> "12.50%"
{{ total | format_number('spell_out', 'en') }}           -> "one thousand five hundred"

3. Date Operations

{{ start_date | format_date('long', 'en') }}      -> "January 12, 2024"
{{ start_date | format_date('add_days', '30') }}  -> "2024-02-11"

4. Conditional Logic

Map status codes or values directly in the document:

{{ status_code | format_logic(
    '10=Approved',
    '20=Pending',
    'default', 'Unknown'
) }}

5. Data Masking

{{ email | format_mask('email') }}                    -> "j***@domain.com"

6. Images

{{ photo_filename | format_image('3', '4') }}         -> (Resizes image to 3x4cm)

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🤝 Contributing

LogicPaper is an open-source project and we love community contributions!

Whether you want to implement a new feature from our Roadmap, fix a bug, or improve documentation, please check our Contributing Guidelines before getting started.

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⚖️ License (CC BY-NC 4.0)

This project is licensed under the Creative Commons Attribution-NonCommercial 4.0 International License.

You are free to

• Share: Copy and redistribute the material in any medium or format.
• Adapt: Remix, transform, and build upon the material.

Under the following terms

1. Attribution: You must give appropriate credit to Rubens Braz, provide a link to the license, and indicate if changes were made.
2. NonCommercial: You may NOT use the material for commercial purposes (selling the software, using it for paid services, or integrating it into commercial products).

To view a copy of this license, visit http://creativecommons.org/licenses/by-nc/4.0/

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👨‍💻 Author

Rubens Braz

"Automation is not about laziness; it's about precision."