textris

Simple gem for implementing texter classes which allow sending SMS messages in similar way to how e-mails are implemented and sent with ActionMailer-based mailers.

Unlike similar gems, textris has some unique features:

• e-mail proxy allowing to inspect messages using Mailinator or similar service
• phone number E164 validation and normalization with the phony gem
• built-in support for the Twilio and Nexmo APIs with twilio-ruby and nexmo gems
• multiple, per-environment configurable and chainable delivery methods
• extensible with any number of custom delivery methods (also chainable)
• background and scheduled texting for Rails 4.2+ thanks to integration with ActiveJob
• scheduled texting for Rails 4.1 and older thanks to integration with the sidekiq gem
• support for testing using self-explanatory Textris::Base.deliveries
• simple, extensible, fully tested code written from the ground up instead of copying ActionMailer

See the blog entry for the whole story and a practical usage example.

Installation

Add to Gemfile:

gem 'textris'

Then run:

bundle install

Usage

Place texter classes in app/texters (e.g. app/texters/user_texter.rb):

class UserTexter < Textris::Base
  default :from => "Our Team <+48 666-777-888>"

  def welcome(user)
    @user = user

    text :to => @user.phone
  end
end

Place relevant view templates in app/views/<texter_name>/<action_name>.text.* (e.g. app/views/user_texter/welcome.text.erb):

Welcome to our system, <%= @user.name %>!

Invoke them from application logic:

class User < ActiveRecord::Base
  after_create do
    UserTexter.welcome(self).deliver
  end
end

MMS

Media messages are supported if you are using the Twilio, Log or Mail adapter. Twilio currently supports sending MMS in the US and Canada.

Media messages aren't part of a template, but must be specified as an array of URLs when sending the message, like:

class UserMediaTexter < Textris::Base
  default :from => "Our Team <+48 666-777-888>"

  def welcome(user)
    @user = user

    text(
      :to         => @user.phone,
      :media_urls => ["http://example.com/hilarious.gif"]
    )
  end
end

Background and scheduled

ActiveJob integration

As of version 0.4, textris supports native Rails 4.2+ way of background job handling, the ActiveJob. You can delay delivery of your texters the same way as with ActionMailer mailers, like:

UserTexter.welcome(user).deliver_later
UserTexter.welcome(user).deliver_later(:wait => 1.hour)
UserTexter.welcome(user).deliver_later(:wait_until => 1.day.from_now)
UserTexter.welcome(user).deliver_later(:queue => :custom_queue)
UserTexter.welcome(user).deliver_now

You can safely pass ActiveRecord records as delayed action arguments. ActiveJob uses GlobalID to serialize them for scheduled delivery.

By default, textris queue will be used by the Textris::Delay::ActiveJob::Job job.

Direct Sidekiq integration

As of Rails 4.2, ActiveJob is the recommended way for background job handling and it does support Sidekiq as its backend, so please see chapter above if you're using Rails 4.2 or above. Otherwise, keep on reading to use textris with Sidekiq regardless of your Rails version.

Thanks to Sidekiq integration, you can send text messages in the background to speed things up, retry in case of failures or just to do it at specific time. To do so, use one of three delay methods:

UserTexter.delay.welcome(user)
UserTexter.delay_for(1.hour).welcome(user)
UserTexter.delay_until(1.day.from_now).welcome(user)

Remember not to call deliver after the action invocation when using delay. It will be called by the Textris::Delay::Sidekiq::Worker worker.

You can safely pass ActiveRecord records and arrays as delayed action arguments. textris will store their ids and find them upon scheduled delivery.

Keep in mind that textris does not install sidekiq for you. If you don't have it yet, install Redis on your machine and add the sidekiq gem to Gemfile:

gem 'sidekiq'

Then run:

bundle install
bundle exec sidekiq

Testing

Access all messages that were sent with the :test delivery:

Textris::Base.deliveries

You may want to clear the delivery queue before each test:

before(:each) do
  Textris::Base.deliveries.clear
end

Keep in mind that messages targeting multiple phone numbers, like:

text :to => ['48111222333', '48222333444']

will yield multiple message deliveries, each for specific phone number.

Configuration

You can change default settings by placing them in any of environment files, like development.rb or test.rb, or setting them globally in application.rb.

Choosing and chaining delivery methods

Below you'll find sample settings for any of supported delivery methods along with short description of each:

# Send messages via the Twilio REST API
config.textris_delivery_method = :twilio

# Send messages via the Nexmo API
config.textris_delivery_method = :nexmo

# Don't send anything, log messages into Rails logger
config.textris_delivery_method = :log

# Don't send anything, access your messages via Textris::Base.deliveries
config.textris_delivery_method = :test

# Send e-mails instead of SMSes in order to inspect their content
config.textris_delivery_method = :mail

# Chain multiple delivery methods (e.g. to have e-mail and log backups of messages)
config.textris_delivery_method = [:twilio, :mail, :log]

Unless otherwise configured, default delivery methods will be: log in development environment, test in test environment and mail in production environment. All these come with reasonable defaults and will work with no further configuration.

Twilio

textris connects with the Twilio API using twilio-ruby gem. It does not, however, install the gem for you. If you don't have it yet, add the twilio-ruby gem to Gemfile:

gem 'twilio-ruby'

Then, pre-configure the twilio-ruby settings by creating the config/initializers/twilio.rb file:

Twilio.configure do |config|
  config.account_sid = 'some_sid'
  config.auth_token  = 'some_auth_token'
end

To use Twilio's Copilot use twilio_messaging_service_sid in place of from when sending a text or setting defaults.

Nexmo

In order to use Nexmo with textris, you need to include the nexmo gem in your Gemfile:

gem 'nexmo', '~> 4'

The Nexmo gem uses the environment variables NEXMO_API_KEY and NEXMO_API_SECRET to authenticate with the API. Therefore the safest way to provide authentication credentials is to set these variables in your application environment.

Log

textris logger has similar logging behavior to ActionMailer. It will log single line to info log with production in mind and then a couple details to debug log. You can change the log level for the whole output:

config.textris_log_level = :info

Custom delivery methods

Currently, textris comes with several delivery methods built-in, but you can easily implement your own. Place desired delivery class in app/deliveries/<name>_delivery.rb (e.g. app/deliveries/my_provider_delivery.rb):

class MyProviderDelivery < Textris::Delivery::Base
  # Implement sending message to single phone number
  def deliver(phone)
    send_sms(:phone => phone, :text => message.content)
  end

  # ...or implement sending message to multiple phone numbers at once
  def deliver_to_all
    send_multiple_sms(:phone_array => message.to, :text => message.content)
  end
end

Only one of methods above must be implemented for the delivery class to work. In case of multiple phone numbers and no implementation of deliver_to_all, the deliver method will be invoked multiple times.

You can place your custom deliveries in app/texters or app/models instead of app/deliveries if you don't want to clutter the app directory too much.

After implementing your own deliveries, you can activate them by setting app configuration:

# Use your new delivery
config.textris_delivery_method = :my_provider

# Chain your new delivery with others, including stock ones
config.textris_delivery_method = [:my_provider, :twilio, :mail]

Configuring the mail delivery

textris comes with reasonable defaults for the mail delivery method. It will send messages to a Mailinator address specific to the application name, environment and target phone number. You can customize the mail delivery by setting appropriate templates presented below.

Arguably, the textris_mail_to_template setting is the most important here as it specifies the target e-mail address scheme.

# E-mail target, here: "[email protected]"
config.textris_mail_to_template = '%{app:d}-%{env:d}-%{to_phone}[email protected]'

# E-mail sender, here: "[email protected]"
config.textris_mail_from_template = '%{from_name:d}-%{from_phone}@%{env:d}.%{app:d}.com'

# E-mail subject, here: "User texter: Welcome"
config.textris_mail_subject_template = '%{texter:dh} texter: %{action:h}'

# E-mail body, here: "Welcome to our system, Mr Jones!"
config.textris_mail_body_template = '%{content}'

Template interpolation

You can use the following interpolations in your mail templates:

• %{app}: application name (e.g. AppName)
• %{env}: enviroment name (e.g. test or production)
• %{texter}: texter name (e.g. User)
• %{action}: action name (e.g. welcome)
• %{from_name}: name of the sender (e.g. Our Team)
• %{from_phone}: phone number of the sender (e.g. 48666777888)
• %{to_phone}: phone number of the recipient (e.g. 48111222333)
• %{content}: message content (e.g. Welcome to our system, Mr Jones!)
• %{media_urls}: comma separated string of media URLs (e.g. http://example.com/hilarious.gif)

You can add optional interpolation modifiers using the %{variable:modifiers} syntax. These are most useful for making names e-mail friendly. The following modifiers are available:

• d: dasherize (for instance, AppName becomes app-name)
• h: humanize (for instance, user_name becomes User name)
• p: format phone (for instance, 48111222333 becomes +48 111 222 333)

URL Defaults

Textris uses ActionController::Renderer behind the scenes. Add or modify config/initializers/application_controller_renderer.rb in your Rails to change the default settings:

# Be sure to restart your server when you modify this file.

ActiveSupport::Reloader.to_prepare do
  ApplicationController.renderer.defaults.merge!(
    http_host: ENV['CANONICAL_HOST'], # or ActionMailer::Base.default_url_options[:host] to use the same host as ActionMailer
    https: Rails.env.production?
  )
end

Example project

Here you can find a simple example project that demonstrates textris usage with Rails 4.2. In order to see how it works or experiment with it, just go to project's directory and invoke:

bundle install
rake db:migrate
rails server

Open application page and fill in some user information. Sample texter will be invoked and you'll see an output similar to following in your server log:

[ActiveJob] Enqueued Textris::Delay::ActiveJob::Job (Job ID: 71ed54f7-02e8-4205-9093-6f2a0ff7f483) to Inline(textris) with arguments: "UserTexter", "welcome", [#<User id: 1, name: "Mr Jones", phone: "48666777888", created_at: "2015-02-20 17:17:16", updated_at: "2015-02-20 17:17:16">]
[ActiveJob]   User Load (0.3ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1  [["id", 1]]
[ActiveJob] [Textris::Delay::ActiveJob::Job] [71ed54f7-02e8-4205-9093-6f2a0ff7f483] Performing Textris::Delay::ActiveJob::Job from Inline(textris) with arguments: "UserTexter", "welcome", [#<User id: 1, name: "Mr Jones", phone: "48666777888", created_at: "2015-02-20 17:17:16", updated_at: "2015-02-20 17:17:16">]
[ActiveJob] [Textris::Delay::ActiveJob::Job] [71ed54f7-02e8-4205-9093-6f2a0ff7f483] Sent text to +48 666 777 888
[ActiveJob] [Textris::Delay::ActiveJob::Job] [71ed54f7-02e8-4205-9093-6f2a0ff7f483] Texter: User#welcome
[ActiveJob] [Textris::Delay::ActiveJob::Job] [71ed54f7-02e8-4205-9093-6f2a0ff7f483] Date: 2015-02-20 18:17:16 +0100
[ActiveJob] [Textris::Delay::ActiveJob::Job] [71ed54f7-02e8-4205-9093-6f2a0ff7f483] From: Our Team <+48 666 777 888>
[ActiveJob] [Textris::Delay::ActiveJob::Job] [71ed54f7-02e8-4205-9093-6f2a0ff7f483] To: +48 666 777 888
[ActiveJob] [Textris::Delay::ActiveJob::Job] [71ed54f7-02e8-4205-9093-6f2a0ff7f483]   Rendered user_texter/welcome.text.erb (0.4ms)
[ActiveJob] [Textris::Delay::ActiveJob::Job] [71ed54f7-02e8-4205-9093-6f2a0ff7f483] Content: Welcome to our system, Mr Jones!
[ActiveJob] [Textris::Delay::ActiveJob::Job] [71ed54f7-02e8-4205-9093-6f2a0ff7f483] Performed Textris::Delay::ActiveJob::Job from Inline(textris) in 9.98ms

Example project may serve as a convenient sandbox for developing custom delivery methods.

Contributing

1. Fork it (https://github.com/visualitypl/textris/fork)
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request

Adding delivery methods

Implementing new delivery methods in Pull Requests is strongly encouraged. Start by implementing custom delivery method. Then, you can prepare it for a Pull Request by adhering to following guidelines:

1. Delivery class should be placed in lib/textris/delivery/service_name.rb and named in a way that will best indicate the service with which it's supposed to work with.
2. Add your method to code example in Choosing and chaining delivery methods in README. Also, add sub-chapter for it if it depends on other gems or requires explanation.
3. Your delivery code is expected to throw exceptions with self-explanatory messages upon failure. Include specs that test this. Mock external API requests with webmock.
4. If delivery depends on any gems, don't add them as runtime dependencies. You can (and should in order to write complete specs) add them as development dependencies.
5. Delivery code must load without exceptions even when dependent libraries are missing. Specs should test such case (you can use remove_const to undefine loaded consts).
6. New deliveries are expected to have 100% test coverage. Run COVERAGE=1 bundle exec rake spec to generate simplecov coverage into the coverage/index.html file.

The commit in which the log delivery was added is an example of delivery method addition that meets all guidelines listed above.