RESTHome

Simple wrapper class generator for consuming RESTful web services

RESTful Example

RESTHome’s are used to communicate to RESTful Web Services.

Let’s say you are working with B2B.dev. They provide a simple RESTful API for interacting with customer data.

API looks like

GET    http://api.b2b.dev/customers.json      - list of your customers
GET    http://api.b2b.dev/customers/<id>.json - customer data
PUT    http://api.b2b.dev/customers/<id>.json - edit customer data
DELETE http://api.b2b.dev/customers/<id>.json - delete customer
POST   http://api.b2b.dev/customers.json      - create a new customer

JSON response looks like {'customer': {'id': 99, 'first_name': 'Joe', 'last_name': 'Smith'}}

Create a simple RESTHome service to interact with B2B.dev api.

class B2BService < RESTHome
  rest :customer, :customers, '/customers.json'

  def initialize(api_key)
    self.base_uri = 'http://api.b2b.dev'
    self.basic_auth = {:username => api_key, :password => 'x'}
  end
end

service = B2BService.new 'XXXXX'
service.customers # returns an array of customers
customer = service.customer 99 # returns the data for customer 99, i.e. {:first_name => 'Joe', :last_name => 'Smith'}
service.edit_customer 99, :first_name => 'Joesph', :last_name => 'Smithie' # edits customer 99
service.delete_customer 99 # deletes customer 99
service.create_customer :first_name => 'John', :last_name => 'Doe' # creates a new customer

Lorem Lipsum Example

Create a simple lorem lipsum generator, using www.lipsum.com.

lipsum = RESTHome.new
lipsum.base_uri = 'http://www.lipsum.com'
lipsum.route :generate, '/feed/json', :method => :post
words = lipsum.generate(:what => 'words', :amount => 20) do |res|
  res['feed']['lipsum']
end

class LoremLipsumService < RESTHome
  base_uri 'http://www.lipsum.com'

  route :generate, '/feed/json', :method => :post do |res|
    res['feed']['lipsum']
  end
end

service = LoremLipsumService.new
words = service.generate(:what => 'words', :amount => 20)

LastFM Example query arguments

How to replace query parameters with function arguments.

class LastFmWebService < RESTHome
  base_uri 'http://ws.audioscrobbler.com'

  namespace '/2.0' do
    route :track, '/', :query => {'method' => 'track.getinfo', 'artist' => :arg1, 'track' => :arg2}, :resource => 'track'
  end

  def initialize(api_key)
    @api_key = api_key
  end

  def build_options!(options)
    options[:query] ||= {}
    options[:query]['format'] = 'json'
    options[:query]['api_key'] = @api_key
  end
end

service = LastFmWebService.new 'xxxxxxxxx'
service.track 'cher', 'believe'

Twilio Example send SMS message

TwilioWebService.service.send_sms_message ‘5551112222’, ‘Verification Code: 2121’

Amazon Simple Email Service (SES)

How to replace body parameters with function arguments.

require 'digest/sha2'
require 'base64'

class AmazonSESService < RESTHome
  base_uri 'https://email.us-east-1.amazonaws.com'

  @@digest256 = OpenSSL::Digest::Digest.new("sha256")

  route :verify_email_address, '/', :body => {'Action' => 'VerifyEmailAddress', 'EmailAddress' => :arg1}, :method => :post, :expected_status => 200, :no_body => true do |res|
    res['VerifyEmailAddressResponse']
  end

  def initialize(access_key, secret)
    @access_key = access_key
    @secret = secret
  end

  def build_options!(options)
    date = Time.now.getutc.httpdate
    options[:headers] ||= {}
    options[:headers]['Date'] = date
    options[:headers]['X-Amzn-Authorization'] = "AWS3-HTTPS AWSAccessKeyId=#{@access_key},Algorithm=HMACSHA256,Signature=#{AmazonSESService.sign_request(@secret, date)}"
  end

  def self.sign_request(secret, date)
    Base64.encode64(OpenSSL::HMAC.digest(@@digest256, secret, date)).gsub("\n","")
  end
end

service = AmazonSESService.new 'my-access-key', 'it-s-a-secret'
service.verify_email_address '[email protected]'

Contributing to RESTHome

Check out the latest master to make sure the feature hasn’t been implemented or the bug hasn’t been fixed yet
Check out the issue tracker to make sure someone already hasn’t requested it and/or contributed it
Fork the project
Start a feature/bugfix branch
Commit and push until you are happy with your contribution
Make sure to add tests for it. This is important so I don’t break it in a future version unintentionally.
Please try not to mess with the Rakefile, version, or history. If you want to have your own version, or is otherwise necessary, that is fine, but please isolate to its own commit so I can cherry-pick around it.