A short talk about coding a strong backend using Ruby. Things like build an API Rest-like or send push notifications are covered on this presentation.

1. The Backend Side of the Mobile
Rodrigo Ayala
Desarrollador
Ruby
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2. @RodrigoAyala
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3. Most Ruby Devs don’t want
to leave Ruby
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4. RubyMotion
An Objective-C
implementation of Ruby
Propietary MacRuby fork
USD$199.99
http://www.rubymotion.com/
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5. Ruboto
JRuby on Android
Open Source
USD$0 - Free as a beer
https://github.com/ruboto/ruboto
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6. Mobile HTTP
API with Ruby
Ruby Web Framework
Open Source
USD$0 - Free as a beer
http://rubyonrails.org/
http://www.sinatrarb.com/
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7. Mobile HTTP
API with Ruby
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8. API Components
for Mobile Apps
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9. API
User authentication with token
Push Notifications
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10. API
https://github.com/intridea/grape
Micro framework to develop
REST-like API
Runs on Rack or mounted on
webapp frameworks (Rails,
Sinatra, etc.)
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11. module Twitter
class API < Grape::API
version 'v1'
format :json
prefix 'api'
end
end
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12. helpers do
def current_user
@current_user ||= User.authorize!(env)
end
def authenticate!
error!('401 Unauthorized', 401) unless current_user
end
end
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13. resource :statuses do
desc "Return a personal timeline."
get :home_timeline do
authenticate!
current_user.statuses.limit(20)
end
desc "Create a status."
params do
requires :status, type: String, desc: "Your status."
end
post :tweet do
authenticate!
Status.create!({
user: current_user,
text: params[:status]
})
end
end
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14. http://myhost.com/api/v1/statuses/home_timeline.json
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16. {
"statuses": [{
"id": 1,
"secret_value": "dont disclose",
"content": "hi"
}]
}
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17. {
"statuses": [{
"id": 1,
"secret_value": "dont disclose",
"content": "hi"
}]
}
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18. API
https://github.com/LTe/grape-rabl
Allow to use Rabl templates
with Grape
Rabl is a template system to
generate JSON, XML
Grape::Rabl
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19. module Twitter
class API < Grape::API
version 'v1'
format :json
prefix 'api'
formatter :json, Grape::Formatter::Rabl
resource :statuses do
desc "Return a personal timeline."
get :home_timeline , :rabl => "user" do
authenticate!
@statuses = current_user.statuses.limit(20)
end
end
end
end
Grape::Rabl
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20. # status.rabl
object @statuses => :statuses
attributes :content
Grape::Rabl
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21. Grape::Rabl
{
"statuses": [{
"id": 1,
"secret_value": "dont disclose",
"content": "hi"
}]
}
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22. {
"statuses": [{
"content": "hi"
}]
}
Grape::Rabl
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24. User authentication with Token
https://github.com/plataformatec/devise
Flexible authentication for
Rails
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25. Token Authenticable
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26. Devise - Token Authenticable
def authenticated
if warden.authenticated?
@current_user = current_user
return true
elsif params[:auth_token] and @current_user =
User.find_by_authentication_token(params[:auth_token])
return true
else
error!('401 Unauthorized', 401)
end
end
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28. Push Notifications
Allow to send Apple Push
Notifications (iOS)
https://github.com/jpoz/apns
APNS
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29. APNS - Push Notifications
$ openssl pkcs12 -in cert.p12 -out cert.pem -nodes -clcerts
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30. APNS - Push Notifications
APNS.host = 'gateway.push.apple.com'
# gateway.sandbox.push.apple.com is default
APNS.pem = '/path/to/pem/file'
# this is the file you just created
# Dir.pwd+”/cert.pem” if you have the certificate on the root
APNS.port = 2195
# this is also the default. Shouldn't ever have to set this, but
just in case Apple goes crazy, you can.
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31. APNS - Push Notifications
device_token = '123abc456def'
APNS.send_notification(device_token, 'Hello iPhone!' )
APNS.send_notification(device_token, :alert => 'Hello iPhone!',
:badge => 1, :sound => 'default')
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32. APNS - Push Notifications
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33. Push Notifications
Allow to send push
notifications to Android
phones via Google Cloud
Messaging
GCM
https://github.com/spacialdb/gcm
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34. APNS - Push Notifications
gcm = GCM.new("GCM_PRIVATE_KEY")
options = {:data=> {:ticker=> "mini title",
:title => "title",
:message => "full message",
:custom => custom
}
}
gcm.send_notification([device_token], options)
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35. APNS - Push Notifications
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37. Gracias!
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