haste-server/lib/key_generators/dictionary.js

const fs = require('fs');

module.exports = class DictionaryGenerator {

	constructor(options, readyCallback){
		// Check options format
		if (!options) throw Error('No options passed to generator');
		if (!options.path) throw Error('No dictionary path specified in options');

		// Load dictionary
		fs.readFile(options.path, 'utf8', (err, data) => {
			if (err) throw err;

			this.dictionary = data.split(/[\n\r]+/);

			if (readyCallback) readyCallback();
		});
	}

	// Generates a dictionary-based key, of keyLength words
	createKey(keyLength){
		let text = '';

		for (let i = 0; i < keyLength; i++){
			const index = Math.floor(Math.random() * this.dictionary.length);
			text += this.dictionary[index];
		}

		return text;
	}

};