node-boleto/lib/boleto.js

var fs = require('fs'),
	ejs = require('ejs'),
	formatters = require('./formatters'),
	barcode = require('./barcode');

var banks = null;

var hashString = function(string) {
  var hash = 0, i, chr, len;
  if (string.length == 0) return hash;
  for (i = 0, len = string.length; i < len; i++) {
	chr   = string.charCodeAt(i);
	hash  = ((hash << 5) - hash) + chr;
	hash |= 0; // Convert to 32bit integer
  }
  return hash;
};

var Boleto = function(options) {
  if(!options) {
	throw "No options provided initializing Boleto.";
  }

  this.bank = banks[options['banco']];
  if(!this.bank) {
	throw "Invalid bank."
  }

  if(!options['data_emissao']) {
	options['data_emissao'] = new Date();
  }

  if(!options['data_expiracao']) {
	options['data_expiracao'] = new Date(new Date().getTime() + (5 * 24 * 3600 * 1000));
  }

  for(var key in options) {
	this[key] = options[key]
  }

  this['pagador'] = formatters.htmlString(this['pagador']);
  this['instrucoes'] = formatters.htmlString(this['instrucoes']);

  if(!this['local_de_pagamento']) {
	this['local_de_pagamento'] = 'Até o vencimento, preferencialmente no Banco ' + formatters.capitalize(this['banco'])
  }

  this._calculate();
};

Boleto.barcodeRenderEngine = 'img';

Boleto.prototype._calculate = function() {
  this['codigo_banco'] = this.bank.options.codigo + "-" + formatters.mod11(this.bank.options.codigo);
  this['nosso_numero_dv'] = formatters.mod11(this['nosso_numero'].toString());
  this['barcode_data'] = this.bank.barcodeData(this);
  this['linha_digitavel'] = this.bank.linhaDigitavel(this['barcode_data']);
}

Boleto.prototype.renderHTML = function(callback) {
  var self = this;

  fs.readFile(__dirname + '/../assets/layout.ejs', function(err, content){
	if(err) {
	  throw err;
	}

	var renderOptions = self.bank.options;
	renderOptions.boleto = self;

	// Copy renderHelper's methods to renderOptions
	for(var key in formatters) {
	  renderOptions[key] = formatters[key];
	}

	renderOptions['barcode_render_engine'] = Boleto.barcodeRenderEngine;
	renderOptions['barcode_height'] = '50';

	if(Boleto.barcodeRenderEngine == 'bmp') {
	  renderOptions['barcode_data'] = barcode.bmpLineForBarcodeData(self['barcode_data']);
	} else if(Boleto.barcodeRenderEngine == 'img') {
	  renderOptions['barcode_data'] = barcode.binaryRepresentationForBarcodeData(self['barcode_data']);
	}

	renderOptions['boleto']['linha_digitavel_hash'] = hashString(renderOptions['boleto']['linha_digitavel']).toString();

	var html = ejs.render(content.toString(), renderOptions);

	callback(html);
  });
}

module.exports = function(_banks){
  banks = _banks;
  return Boleto;
}