Class: Opera::MobileStoreSDK::FaradayMiddleware::Authentication

Inherits:
Faraday::Middleware
  • Object
show all
Defined in:
lib/opera/mobile_store_sdk/faraday_middleware/authentication.rb

Overview

Adds the Opera Mobile Store Partner authentication parameters to the request

Instance Method Summary collapse

Constructor Details

#initialize(app, username, password, options = {}) ⇒ Authentication

Public: Initialize the middleware.

app - the Faraday app to wrap username - The Partner’s username password - The Partner’s username options - (optional)

:authentication - (:password | :signature)



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# File 'lib/opera/mobile_store_sdk/faraday_middleware/authentication.rb', line 15

def initialize(app, username, password, options = {})
  super(app)

  @username, @password = username, password

  options = options.with_indifferent_access

  @authentication = if options.key?(:authentication) && [:password, :signature].include?(options[:authentication])
    options[:authentication]
  else
    :signature
  end
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/opera/mobile_store_sdk/faraday_middleware/authentication.rb', line 29

def call(env)

  auth_params = { login: @username }

  case @authentication
  when :password then
    auth_params[:pwd] = @password
  else
    auth_params[:sign] = get_signature(env)
  end

  # Add the generated params to the url query:
  auth_query = auth_params.inject([]) { |arr, kv| arr + [kv.join('=')] }.join('&')
  env.url.query = [auth_query, env.url.query].join('&')
  
  env[:url] = env.url

  @app.call(env)
end

#get_signature(env) ⇒ Object

Generates the required HMAC Hash using the request’s GET params processed using Opera’s “special algorithm”:



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# File 'lib/opera/mobile_store_sdk/faraday_middleware/authentication.rb', line 56

def get_signature(env)

  params_string = env.url.query.split('&').inject({}) do |hash, keyval|
    key, val = keyval.split('=')
    hash[key] = val
    hash
  end.except("login").sort.inject "" do |concatenated_string, keyval|
    concatenated_string += keyval.map(&:downcase).join
  end

  # Return the SHA1 HMAC Hash:
  OpenSSL::HMAC.hexdigest(
    OpenSSL::Digest.new('sha1'), signature_key, params_string
  )
end

#signature_key ⇒ Object

Uses the partner password to generate the HMAC SHA1 key:



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# File 'lib/opera/mobile_store_sdk/faraday_middleware/authentication.rb', line 50

def signature_key
  @_signature_key ||= [@password].pack("H*")
end