cantina-email.js

var nodemailer = require('nodemailer')
  , handlebars = require('handlebars')
  , path = require('path')
  , fs = require('fs')
  , loadTemplate = require('yaml-front-matter').loadFront
  , marked = require('marked')
  , glob = require('glob');

module.exports = function (app) {
  // Default conf.
  app.conf.add({
    email: {
      transport: 'Stub'
    }
  });

  // Get conf.
  var conf = app.conf.get('email');

  // Create mailer if one doesn't exist.
  if (!app.mailer) {
    app.mailer = nodemailer.createTransport(conf.transport, conf);
  }

  // Setup API.
  app.email = app.email || {};
  app.email.templates = {};
  app.email.sent = [];

  // Send an email.
  app.email.send = function (name, vars, cb) {
    if (typeof vars === 'function') {
      cb = vars;
      vars = {};
    }

    app.hook('email:send:before').run(name, vars, function (err) {

      // Get template.
      var template = app.email.templates[name];
      if (!template) return cb(new Error('email template not found: ' + name));

      // Prepare email.
      var email = {};
      Object.keys(template).forEach(function (k) {
        if (typeof template[k] === 'function') {
          email[k] = template[k].call(template, vars);
        }
        else {
          email[k] = template[k];
        }
      });
      email.html = marked(email.text);

      // Send email.
      app.mailer.sendMail(email, function (err, resp) {
        if (err) return cb(err);

        if (resp && process.env.NODE_ENV !== 'production') {
          app.email.sent.push(resp);
        }

        app.log('email', {
          to: email.to,
          from: email.from,
          subject: email.subject,
          date: new Date(),
          template: name,
          variables: vars
        });

        app.hook('email:send:after').run(name, vars, email, resp, cb);
      });
    });
  };

  // Register a loader for email templates.
  app.loader('email', {dir: 'email/templates'}, function (options) {
    glob.sync('**/*.md', {cwd: options.path}).forEach(function (file) {
      var template = loadTemplate(path.resolve(options.path, file), 'text');
      Object.keys(template).forEach(function (k) {
        if (typeof template[k] === 'string') {
          template[k] = handlebars.compile(template[k]);
        }
      });
      app.email.templates[file.replace(/\.md$/, '')] = template;
    });
  });
};