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index.js
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index.js
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'use strict';
const path = require('path');
const fs = require('fs');
const async = require('async');
const assert = require('assert');
const nodemailer = require('nodemailer');
const handlebars = require('handlebars');
const sgMail = require('@sendgrid/mail')
/**
* Interface for dispatching email
* @constructor
* @param {Object} options
*/
function Mailer(options) {
if (!(this instanceof Mailer)) {
return new Mailer(options);
}
options = options || {};
if (!options.sendgrid || !options.sendgrid.api_key) {
assert.ok(options.host, 'No SMTP host supplied');
assert.ok(options.port, 'No SMTP port supplied');
}
if (options.sendgrid && options.sendgrid.api_key) {
sgMail.setApiKey(options.sendgrid.api_key);
}
this._options = options;
this._transporter = nodemailer.createTransport(options);
}
/**
* Sends the email template to the specified address
* using SMTP protocol
* #dispatch
* @param {String} email
* @param {String} template
* @param {Object} context
* @param {Function} callback
*/
Mailer.prototype.dispatch = function (email, template, context, callback) {
var self = this;
var done = callback || function () { };
self.getTemplate(template, function (err, template) {
if (err) {
return done(err);
}
let compiled = template(context);
let mailparams = {
to: email,
from: self._options.from,
subject: compiled.subject,
html: compiled.markup,
text: compiled.plaintext
};
self._transporter.sendMail(mailparams, done);
});
};
/**
* Sends the email template to the specified address,
* using SendGrid API
* #dispatch
* @param {String} email
* @param {String} template
* @param {Object} context
* @param {Function} callback
*/
Mailer.prototype.dispatchSendGrid = function (email, template, context, callback) {
var self = this;
var done = callback || function () { };
if (!self._options || !self._options.sendgrid || !self._options.sendgrid.api_key) {
return callback(new Error('No SendGrid API Key provided'));
}
self.getTemplate(template, function (err, template) {
if (err) {
return done(err);
}
let compiled = template(context);
let mailparams = {
to: email,
from: self._options.from,
subject: compiled.subject,
html: compiled.markup,
text: compiled.plaintext
};
sgMail.send(mailparams).then(function () {
callback()
}).catch(function (err) {
callback(err);
})
});
}
/**
* Loads and compiles the mail template
* #getTemplate
* @param {String} name
* @param {Function} callback
*/
Mailer.prototype.getTemplate = function (name, callback) {
assert.ok(name, 'No template name was supplied');
let stack = [
this._getSubject.bind(this, name),
this._getMarkup.bind(this, name),
this._getPlaintext.bind(this, name)
];
async.parallel(stack, function (err, results) {
if (err) {
return callback(err);
}
callback(null, function render(data) {
data = data || {};
return {
subject: results[0](data),
markup: results[1](data),
plaintext: results[2](data)
};
});
});
};
/**
* Helper for loading email template subject
* #_getSubject
* @param {String} name
* @param {Function} callback
*/
Mailer.prototype._getSubject = function (name, callback) {
this.__getTemplateResource([name, 'subject'].join('.'), callback);
};
/**
* Helper for loading email template markup
* #_getMarkup
* @param {String} name
* @param {Function} callback
*/
Mailer.prototype._getMarkup = function (name, callback) {
this.__getTemplateResource([name, 'html'].join('.'), callback);
};
/**
* Helper for loading email template plaintext
* #_getPlaintext
* @param {String} name
* @param {Function} callback
*/
Mailer.prototype._getPlaintext = function (name, callback) {
this.__getTemplateResource([name, 'txt'].join('.'), callback);
};
/**
* Helper for loading email template resource
* #__getTemplateResource
* @param {String} filename
* @param {Function} callback
*/
Mailer.prototype.__getTemplateResource = function (filename, callback) {
fs.exists(path.join(__dirname, 'templates', filename), function (exists) {
if (!exists) {
return callback(new Error('Resource "' + filename + '" does not exist'));
}
fs.readFile(
path.join(__dirname, 'templates', filename),
function (err, contents) {
if (err) {
return callback(err);
}
callback(null, handlebars.compile(contents.toString()));
}
);
});
};
module.exports = Mailer;