OBF Node

Node.js implementation of the Open Board Format (OBF) validator and converter. This tool allows you to validate OBF/OBZ files and convert them between various formats including PDF, PNG, SFY, and SGRID.

Installation

npm install
npm run build

CLI Usage

Validate a file

obf-node validate path/to/board.obf

Supported formats for conversion to OBF:

• .sfy (Sensory Grid Player)
• .sgrid (Sensory Grid)
• .ce (TouchChat)
• .spb / .sps (Snap)
• .gridset (Grid3)
• .obz (Open Board Zip)
• .obf (Open Board Format)
• .json (Generic OBF JSON)

Convert between formats

You can convert from OBF, OBZ, SFY, SGRID, TouchChat (.ce), Snap (.spb/.sps), or Grid3 (.gridset) to PDF, PNG, OBF, or OBZ.

Note: The SFY and SGRID converters are ported from the original Ruby codebase and serve as demonstration of how native/proprietary AAC formats can be converted to the Open Board Format.

# Convert OBF to PDF
obf-node convert path/to/board.obf output.pdf

# Convert OBZ to PNG
obf-node convert path/to/board.obz output.png

# Convert SFY to OBZ (packages the board with its assets)
obf-node convert path/to/board.sfy output.obz

# Convert SGRID to OBF
obf-node convert path/to/board.sgrid output.obf

Library Usage (TypeScript/ESM)

import { Validator, PdfBuilder, Utils, External } from 'obf-node';

// Validate
const result = await Validator.validate_file('path/to/board.obf');
console.log(result.valid ? 'Valid!' : 'Invalid');

// Load and Convert
const board = await Utils.load_obf('path/to/board.obf');
await PdfBuilder.build(board, 'output.pdf');

// Package OBF into OBZ
await External.to_obz(board, 'output.obz');

Browser Usage

The library is now universal and can be used in the browser. File-system based methods (validate_file, load_obf) are only available in Node.js, but you can use validate_content and load_obf_content with a Buffer, Uint8Array, or Blob.

import { Validator, Utils } from 'obf-node';

const file = // ... get from input type="file"
const arrayBuffer = await file.arrayBuffer();
const uint8Array = new Uint8Array(arrayBuffer);

// Validate content
const result = await Validator.validate_content(uint8Array, file.name, file.size);

// Load OBF data
const board = await Utils.load_obf_content(uint8Array, file.name);

Development

• npm run build: Compile TypeScript to dist
• npm run dev: Run the CLI directly from TS source using ts-node
• npm test: Run tests
• npm run lint: Lint the codebase
• npm run format: Format the codebase with Prettier

Requirements for PNG Conversion

PNG conversion currently requires ImageMagick (convert command) to be installed on your system.

License

Licensed under the MIT License.