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An extensible open-source mobile backend framework

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Helios is an open-source framework that provides essential backend services for iOS apps, from data synchronization and user accounts to push notifications, in-app purchases, and passbook integration. It allows developers to get a client-server app up-and-running in just a few minutes, and seamlessly incorporate functionality as necessary.

Helios is designed for "mobile first" development. Build out great features on the device, and implement the server-side components as necessary. Pour all of your energy into crafting a great user experience, rather than getting mired down with the backend.

One great example of this philosophy in Helios is Core Data Synchronization. This allows you to use your existing Core Data model definition to automatically generate a REST webservice, which can be used to shuttle data between the server and client. No iCloud, no problem.

Helios also comes with a Web UI. Browse and search through all of your database records, push notification registrations, in-app purchases, and passbook passes. You can even send targeted push notifications right from the browser.


  • Ruby 2.0+ with Bundler installed
  • PostgreSQL 9.2+ ( is the easiest way to get a Postgres server running on your Mac)

Getting Started on OS X

  1. Verify Ruby Installation:
$ ruby -v
  1. Install Helios, Bundler, and at the command prompt:
$ gem install helios
  1. Create a new Helios application:
$ helios new myapp
  1. Create a Postgres database at the command prompt:
$ createdb -h localhost myapp

Database credentials are read from the

file generated by Helios, as the variable
. By default, this will point to a database with the name of the generated app.
  1. Change directory to
$ cd myapp
  1. Start the web server:
$ helios server
  1. Go to http://localhost:5000/admin and you’ll see your app's Web UI

Read on for instructions on the following:

  • Linking a Core Data model
  • Integrating Helios into your mobile client


Built on the Rack webserver interface, Helios can be easily added into any existing Rails or Sinatra application as middleware. Or, if you're starting with a Helios application, you can build a new Rails or Sinatra application on top of it.

This means that you can develop your application using the tools and frameworks you love, and maintain flexibility with your architecture as your needs evolve.

Sinatra / Rack


gem 'helios'

require 'bundler'

run do service :data, model: 'path/to/DataModel.xcdatamodel' service :push_notification, apn_certificate: 'path/to/apple_push_notification.pem', apn_environment: 'development' service :in_app_purchase service :passbook end


To create a Rails app that uses Postgres as its database, pass the

-d postgresql
argument to the
rails new
$ rails new APP_PATH -d postgresql

If you're adding Helios to an existing Rails project, be sure to specify a PostgreSQL database in

and check that the
gem is included in your


gem 'helios'
gem 'pg'

Helios can be run as Rails middleware by adding this to the configuration block in



config.middleware.use Helios::Application do
  service :data, model: 'path/to/DataModel.xcdatamodel'
  service :push_notification, apn_certificate: 'path/to/apple_push_notification.pem', apn_environment: 'development'
  service :in_app_purchase
  service :passbook

Available Services

Each service in Helios can be enabled and configured separately:

: Generates a REST webservice from a schema definition. Currently supports Core Data (
) files.


  • model
    : Path to the data model file

Associated Classes

Each entity in the specified data model will have a

subclass created for it under the

| | | |---------------------------|----------------------------------------------------| |

GET /:resources
| Get list of all of the specified resources | |
POST /:resources
| Create a new instance of the specified resource | |
GET /:resources/:id
| Get the specified resource instance | |
PUT /:resources/:id
| Update the specified resource instance | |
DELETE /:resources/:id
| Delete the specified resource instance |

: Adds iOS push notification registration / unregistration endpoints.

Associated Classes

  • Rack::PushNotification::Device

| | | |---------------------------|-----------------------------------------------------------| |

PUT /push_notification/devices/:token
| Register or update existing device for push notifications | |
DELETE /push_notification/devices/:token
| Unregister a device from receiving push notifications | |
POST /push_notification/message
| Send out a push notification to some devices |

: Adds an endpoint for iOS in-app purchase receipt verification endpoints, as well one for returning product identifiers.

Associated Classes

  • Rack::InAppPurchase::Receipt
  • Rack::InAppPurchase::Product

| | | |------------------------------|-----------------------------------------------------------| |

POST /in_app_purchase/receipts/verify
| Decode the associated Base64-encoded
, recording the receipt data and verifying the information with Apple | |
GET /in_app_purchase/products/identifiers
| Get an array of valid product identifiers |

: Adds endpoints for the web service protocol for communicating with Passbook

Associated Classes

  • Rack::Passbook::Pass
  • Rack::Passbook::Registration

| | | |---------------------------|----------------------------------------------------| |

GET /passbook/v1/passes/:passTypeIdentifier/:serialNumber
| Get the Latest Version of a Pass | |
GET /passbook/v1/devices/:deviceLibraryIdentifier/registrations/:passTypeIdentifier[?passesUpdatedSince=tag]
| Get the Serial Numbers for Passes Associated with a Device | |
POST /passbook/v1/devices/:deviceLibraryIdentifier/registrations/:passTypeIdentifier/:serialNumber
| Register a Device to Receive Push Notifications for a Pass | |
DELETE /passbook/v1/devices/:deviceLibraryIdentifier/registrations/:passTypeIdentifier/:serialNumber
| Unregister a Device |

: Adds endpoints for Newsstand. Offers complete management of issues, covers, and assets, with plist-based web services and Atom feeds.

Associated Classes

  • Rack::Newsstand::Issue

| | | |-------------------------------|-------------------------| |

GET /newsstand/issues
| Get list of all issues | |
GET /newsstand/issues/:name
| Get a specific issue | |
POST /newsstand/issues
| Add a new issue |

Command-Line Interface

Helios comes with a CLI to help create and manage your application. After you

$ gem install helios
, you'll have the
binary available.
$ helios --help

A command-line interface for building mobile infrastructures

Commands: console Open IRB session with Helios environment help Display global or [command] help documentation. link Links a Core Data model new Creates a new Helios project server Start running Helios locally

Creating an Application

The first step to using Helios is to create a new application. This can be done with the

$ helios new
command, which should be familiar if you've ever used Rails.
$ helios new --help

Usage: helios new path/to/app

The helios new command creates a new Helios application with a default directory structure and configuration at the path you specify.

Options: --skip-gemfile Don't create a Gemfile -B, --skip-bundle Don't run bundle install -G, --skip-git Don't create a git repository --edge Setup the application with Gemfile pointing to Helios repository -f, --force Overwrite files that already exist -p, --pretend Run but do not make any changes -s, --skip Skip files that already exist

Linking a Core Data Model

In order to keep your data model and REST webservices in sync, you can link it to your helios application:

$ helios link path/to/DataModel.xcdatamodel

This creates a hard link between the data model file in your Xcode and Helios projects—any changes made to either file will affect both. The next time you start the server, Helios will automatically migrate the database to create tables and insert columns to accomodate any new entities or attributes.

If you are using OS X, do not attempt to delete your Helios application directory using

rm -r
if you have linked a Core Data model. Doing so will result in the removal of the Xcode data model itself. Instead use the finder to move the Helios application directory to trash.

Starting the Application Locally

To run Helios in development mode on

, run the
$ helios server

Testing Push Notifications

Once you have registered a device and set up your certificate, try this:

$ curl -X POST -d 'payload={"aps": {"alert":"Blastoff!"}}' http://localhost:5000/push_notification/message

Setting Up Storage for Newsstand

In order to set up storage for Newsstand, you will need an account with one of the following cloud storage providers:

In your application directory, edit the
with your credentials for the cloud storage provider of your choice. Here is an example configuration using AWS.
require 'bundler'

app = { service :data, model: Dir['.xcdatamodel'].first if Dir['.xcdatamodel'].any? service :push_notification service :in_app_purchase service :passbook service :newsstand, { storage: { provider: 'AWS', aws_access_key_id: 'YOUR_ACCESS_KEY_ID', aws_secret_access_key: 'YOUR_SECRET_ACCESS_KEY' } } }

run app

For other configuration options, see

Running the Helios Console

You can start an IRB session with the runtime environment of the Helios application with the

$ helios console

This command activates the services as configured by your Helios application, including any generated Core Data models. The

module is automatically included on launch, allowing you to access everything more directly:
> Data::Artist.all #=> [...]
> InAppPurchase::Receipt.all #=> [...]
> Newsstand::Issue.all #=> [...]
> Passbook::Passes.all #=> [...]
> PushNotification::Device.all #=> [...]

Deploying to Heroku

Heroku is the easiest way to get your app up and running. For full instructions on how to get started, check out "Getting Started with Ruby on Heroku".

Once you've installed the Heroku Toolbelt, and have a Heroku account, enter the following commands from the project directory:

$ heroku create
$ git add .
$ git push heroku master

Integrating with an iOS Application

Core Data Synchronization

With AFIncrementalStore, you can integrate your Helios app directly into the Core Data stack. Whether it’s a fetch or save changes request, or fulfilling an attribute or relation fault, AFIncrementalStore handles all of the networking needed to read and write to and from the server.

See "Building an iOS App with AFIncrementalStore and the Core Data Buildpack" on the Heroku Dev Center for a comprehensive guide on how to use AFIncrementalStore with the Core Data buildpack. An article for Helios is forthcoming, but aside from deployment, the instructions are essentially unchanged.

Push Notification Registration

With Orbiter you can integrate Push Notifications into your app easily.

- (void)application:(UIApplication *)application
didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken
    NSURL *serverURL = [NSURL URLWithString:@""];
    Orbiter *orbiter = [[Orbiter alloc] initWithBaseURL:serverURL credential:nil];
    [orbiter registerDeviceToken:deviceToken withAlias:nil success:^(id responseObject) {
        NSLog(@"Registration Success: %@", responseObject);
    } failure:^(NSError *error) {
        NSLog(@"Registration Error: %@", error);

Converting Your Push Notification Certificate

These instructions come from the APN on Rails project.

Once you have the certificate from Apple for your application, export your key and the apple certificate as p12 files. Here is a quick walkthrough on how to do this:

  1. Click the disclosure arrow next to your certificate in Keychain Access and select the certificate and the key.
  2. Right click and choose
    Export 2 items…
  3. Choose the p12 format from the drop down and name it

Now covert the p12 file to a pem file:

$ openssl pkcs12 -in cert.p12 -out apple_push_notification.pem -nodes -clcerts


Helios is released under the MIT License.

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