mailgun-js

Simple Node.js helper module for Mailgun API

mailgun.js

Simple Node.js module for Mailgun.

Usage overview

Please see Mailgun Documentation for full Mailgun API reference.

This module works by providing proxy objects for interacting with different resources through the Mailgun API. Most methods take a data parameter, which is a Javascript object that would contain the arguments for the Mailgun API. All methods take a final parameter callback with two parameters: error, and body. We try to parse the body into a javascript object, and return it to the callback as such for easier use and inspection by the client. If there was an error a new Error object will be passed to the callback in the error parameter. If the error originated from the (Mailgun) server, the response code will be available in the statusCode property of the error object passed in the callback. See the /docs folder for detailed documentation. For full usage examples see the /test folder.

var api_key = 'key-XXXXXXXXXXXXXXXXXXXXXXX';
var domain = 'mydomain.mailgun.org';
var mailgun = require('mailgun-js')({apiKey: api_key, domain: domain});
 
var data = {
  from: 'Excited User <me@samples.mailgun.org>',
  to: 'serobnic@mail.ru',
  subject: 'Hello',
  text: 'Testing some Mailgun awesomness!'
};
 
mailgun.messages().send(data, function (error, body) {
  console.log(body);
});

Messages stored using the Mailgun store() action can be retrieved using messages(<message_key>).info() function. Optionally the MIME representation of the message can be retrieved if MIME argument is passed in and set to true.

Something more elaborate. Get mailing list info, create a member and get mailing list members and update member. Notice that the proxy objects can be reused.

var list = mailgun.lists('mylist@mycompany.com');
 
list.info(function (err, data) {
  // `data` is mailing list info 
  console.log(data);
});
 
var bob = {
  subscribed: true,
  address: 'bob@gmail.com',
  name: 'Bob Bar',
  vars: {age: 26}
};
 
list.members().create(bob, function (err, data) {
  // `data` is the member details 
  console.log(data);
});
 
list.members().list(function (err, members) {
  // `members` is the list of members 
  console.log(members);
});
 
list.members('bob@gmail.com').update({ name: 'Foo Bar' }, function (err, body) {
  console.log(body);
});

Options

Mailgun object constructor options:

apiKey - Your Mailgun API KEY
domain - Your Mailgun Domain
mute - Set to true if you wish to mute the console error logs in validateWebhook() function
proxy - The proxy URI in format http[s]://[auth@]host:port. ex: 'http://proxy.example.com:8080'

Attachments

Attachments can be sent using either the attachment or inline parameters. inline parameter can be use to send an attachment with inline disposition. It can be used to send inline images. Both types are supported with same mechanisms as described, we will just use attachment parameter in the documentation below but same stands for inline.

Sending attachments can be done in a few ways. We can use the path to a file in the attachment parameter. If the attachment parameter is of type string it is assumed to be the path to a file.

var filepath = path.join(__dirname, 'mailgun_logo.png');
 
var data = {
  from: 'Excited User <me@samples.mailgun.org>',
  to: 'serobnic@mail.ru',
  subject: 'Hello',
  text: 'Testing some Mailgun awesomness!',
  attachment: filepath
};
 
mailgun.messages().send(data, function (error, body) {
  console.log(body);
});

We can pass a buffer (has to be a Buffer object) of the data. If a buffer is used the data will be attached using a generic filename "file".

var filepath = path.join(__dirname, 'mailgun_logo.png');
var file = fs.readFileSync(filepath);
 
var data = {
  from: 'Excited User <me@samples.mailgun.org>',
  to: 'serobnic@mail.ru',
  subject: 'Hello',
  text: 'Testing some Mailgun awesomness!',
  attachment: file
};
 
mailgun.messages().send(data, function (error, body) {
  console.log(body);
});

Finally we provide a Mailgun.Attachment class to add attachments with a bit more customization. The Attachment constructor takes an options object. The options parameters can have the following fields:

data - can be one of
- a string representing file path to the attachment
- a buffer of file data
- an instance of Readable which means it is a readable stream.
filename - the file name to be used for the attachment. Default is 'file'
contentType - the content type. Required for case of Readable data. Ex. image/jpg.
knownLength - the content length in bytes. Required for case of Readable data.

If an attachment object does not satisfy those valid conditions it is ignored. Multiple attachments can be sent by passing an array in the attachment parameter. The array elements can be of any one of the valid types and each one will be handled appropriately.

var mailgun = require('mailgun-js')({apiKey: api_key, domain: domain});
var filename = 'mailgun_logo.png';
var filepath = path.join(__dirname, filename);
var file = fs.readFileSync(filepath);
 
var attch = new mailgun.Attachment({data: file, filename: filename});
 
var data = {
  from: 'Excited User <me@samples.mailgun.org>',
  to: 'serobnic@mail.ru',
  subject: 'Hello',
  text: 'Testing some Mailgun awesomness!',
  attachment: attch
};
 
mailgun.messages().send(data, function (error, body) {
  console.log(body);
});

var mailgun = require('mailgun-js')({apiKey: api_key, domain: domain});
var filename = 'mailgun_logo.png';
var filepath = path.join(__dirname, filename);
var fileStream = fs.createReadStream(filepath);
var fileStat = fs.statSync(filepath);
 
msg.attachment = new mailgun.Attachment({
  data: fileStream,
  filename: 'my_custom_name.png',
  knownLength: fileStat.size,
  contentType: 'image/png'});
 
mailgun.messages().send(data, function (error, body) {
  console.log(body);
});

Sending MIME messages

Sending messages in MIME format can be accomplished using the sendMime() function of the messages() proxy object. The data parameter for the function has to have to and message properties. The message property can be a full file path to the MIME file, a stream of the file (that is a Readable object), or a string representation of the MIME message. To build a MIME string you can use the [Mail Composer] (https://www.npmjs.org/package/mailcomposer) library. Some examples:

var domain = 'mydomain.mailgun.org';
var mailgun = require('mailgun-js')({ apiKey: "YOUR API KEY", domain: domain });
var mailcomposer = new MailComposer();
    
mailcomposer.setMessageOption({
  from: 'you@samples.mailgun.org',
  to: 'mm@samples.mailgun.org',
  subject: 'Test email subject',
  body: 'Test email text',
  html: '<b> Test email text </b>'
});
 
mailcomposer.buildMessage(function(mailBuildError, messageSource) {
 
    var dataToSend = {
        to: 'mm@samples.mailgun.org',
        message: messageSource
    };
 
    mailgun.messages().sendMime(dataToSend, function (sendError, body) {
        if (sendError) {
            console.log(sendError);
            return;
        } 
    });
});

Referencing MIME file

var filepath = '/path/to/message.mime';
 
var data = {
  to: fixture.message.to,
  message: filepath
};
 
mailgun.messages().sendMime(data, function (err, body) {
  console.log(body);
});

var filepath = '/path/to/message.mime';
 
var data = {
  to: fixture.message.to,
  message: fs.createReadStream(filepath)
};
 
mailgun.messages().sendMime(data, function (err, body) {
  console.log(body);
});

Creating mailing list members

members().create({data}) will create a mailing list member with data. Mailgun also offers a resource for creating members in bulk. Doing a POST to /lists/<address>/members.json adds multiple members, up to 1,000 per call, to a Mailing List. This can be accomplished using members().add().

var members = [
  {
    address: 'Alice <alice@example.com>',
    vars: { age: 26 }
  },
  {
    name: 'Bob',
    address: 'bob@example.com',
    vars: { age: 34 }
  }
];
 
mailgun.lists('mylist@mycompany.com').members().add({ members: members, subscribed: true }, function (err, body) {
  console.log(body);
});

Generic requests

Mailgun-js also provides helper methods to allow users to interact with parts of the api that are not exposed already. These are not tied to the domain passed in the constructor, and thus require the full path with the domain passed in the resource argument.

mailgun.get(resource, data, callback) - sends GET request to the specified resource on api.
mailgun.post(resource, data, callback) - sends POST request to the specified resource on api.
mailgun.delete(resource, data, callback) - sends DELETE request to the specified resource on api.
mailgun.put(resource, data, callback) - sends PUT request to the specified resource on api.

Example: Get some stats

mailgun.get('/samples.mailgun.org/stats', { event: ['sent', 'delivered'] }, function (error, body) {
  console.log(body);
});

Promises

Module works with Node-style callbacks, but also implements promises with the Q library.

mailgun.lists('mylist@mydomain.com').info().then(function (data) {
  console.log(data);
}, function (err) {
  console.log(err);
});

The function passed as 2nd argument is optional and not needed if you don't care about the fail case.

Webhook validation

The Mailgun object also has a helper function for validating Mailgun Webhook requests (as per the mailgun docs for securing webhooks). This code came from this gist.

Example usage:

var mailgun = require('mailgun-js')({apiKey: api_key, domain: domain});
 
function router(app) {
  app.post('/webhooks/mailgun/*', function (req, res, next) {
    var body = req.body;
 
    if (!mailgun.validateWebhook(body.timestamp, body.token, body.signature)) {
      console.error('Request came, but not from Mailgun');
      res.send({ error: { message: 'Invalid signature. Are you even Mailgun?' } });
      return;
    }
 
    next();
  });
 
  app.post('/webhooks/mailgun/catchall', function (req, res) {
    // actually handle request here 
  });
}

Tests

To run the test suite you must first have a Mailgun account with a domain setup. Then create a file named ./test/auth.json, which contains your credentials as JSON, for example:

{ "api_key": "key-XXXXXXXXXXXXXXXXXXXXXXX", "domain": "mydomain.mailgun.org" }

You should edit ./test/fixture.json and modify the data to match your context.

Then install the dev dependencies and execute the test suite:

$ npm install
$ npm test

The tests will call Mailgun API, and will send a test email, create route(s), mailing list and mailing list member.

Notes

This project is not endorsed by or affiliated with Mailgun. The general design and some code was heavily inspired by node-heroku-client.

License

Licensed under the MIT License.