Add Ept class and form helpers

.gitignore

@@ -6,3 +6,4 @@
 /pkg/
 /spec/reports/
 /tmp/
+/Gemfile.lock

lib/monetico_paiement.rb

@@ -1,8 +1,44 @@
 # frozen_string_literal: true
 
-require_relative "monetico_paiement/version"
+require "monetico_paiement/version"
+require "monetico_paiement/parameters"
+require "monetico_paiement/ept"
+require "monetico_paiement/railtie" if defined?(Rails)
 
 module MoneticoPaiement
   class Error < StandardError; end
-  # Your code goes here...
+
+  API_VERSION = "3.0"
+  DATE_FORMAT = "%d/%m/%Y:%H:%M:%S"
+
+  END_POINTS = {
+    production: 'https://p.monetico-services.com/paiement.cgi',
+    test: 'https://p.monetico-services.com/test/paiement.cgi'
+  }
+  DEFAULT_ENV = :test
+
+  def self.configure(&block)
+    yield default_config
+  end
+
+  def self.default_config
+    @@default_config ||= MoneticoPaiement::Config.new
+  end
+
+  class Config
+    attr_accessor :hmac_key, :ept_number, :company_code, :env
+    attr_writer :target_url
+
+    def initialize(hmac_key: nil, ept_number: nil, company_code: nil, env: MoneticoPaiement::DEFAULT_ENV, target_url: nil)
+      self.hmac_key = hmac_key
+      self.ept_number = ept_number
+      self.company_code = company_code
+      self.env = env
+      self.target_url = target_url
+    end
+
+    def target_url
+      @target_url || END_POINTS[env]
+    end
+  end
 end

lib/monetico_paiement/ept.rb

@@ -0,0 +1,70 @@
+require 'base64'
+require 'openssl'
+require 'json'
+
+module MoneticoPaiement
+  class Ept
+    attr_reader :config
+
+    def initialize(config = nil)
+      @config = config ? config : MoneticoPaiement.default_config
+    end
+
+    def attributes(reference, price, context:, email:, url_error:, url_success:, text: '', currency: 'EUR', locale: 'FR')
+      {
+        TPE: config.ept_number,
+        contexte_commande: Base64.strict_encode64(context.to_json),
+        date: Time.now.strftime(MoneticoPaiement::DATE_FORMAT),
+        lgue: locale,
+        mail: email,
+        montant: ("%.2f" % price) + currency,
+        reference: reference,
+        societe: config.company_code,
+        'texte-libre': text,
+        url_retour_err: url_error,
+        url_retour_ok: url_success,
+        version: MoneticoPaiement::API_VERSION
+      }
+    end
+
+    def mac_string(params)
+      compute_hmac_sha1 generate_data(params)
+    end
+
+    def valid_hmac?(params)
+      return false unless params.key?('MAC')
+
+      mac_string(params) == params['MAC'].downcase
+    end
+
+    private
+
+    def generate_data(params)
+      params.reject { |k| k == 'MAC' }
+        .sort
+        .map { |pair| pair.join('=') }
+        .join('*')
+    end
+
+    def compute_hmac_sha1(data)
+      OpenSSL::HMAC.hexdigest(OpenSSL::Digest::SHA1.new, usable_key, data).downcase
+    end
+
+    def usable_key
+      hex_string_key  = config.hmac_key[0..37]
+      hex_final   = config.hmac_key[38..40] + "00";
+
+      cca0 = hex_final[0].ord
+
+      if cca0 > 70 && cca0 < 97
+        hex_string_key += (cca0 - 23).chr + hex_final[1..2]
+      elsif hex_final[1..2] == "M"
+        hex_string_key += hex_final[0..1] + "0"
+      else
+        hex_string_key += hex_final[0..2]
+      end
+
+      [hex_string_key].pack("H*")
+    end
+  end
+end

lib/monetico_paiement/form_helper.rb

@@ -0,0 +1,25 @@
+module MoneticoPaiement
+  module FormHelper
+    def monetico_paiement_form_tag(reference, price, form_options: {}, context:, email:, url_error:, url_success:, currency: 'EUR', locale: 'FR', ept: MoneticoPaiement::Ept.new, &block)
+      form_tag ept.config.target_url, method: :post, authenticity_token: false, remote: false, enforce_utf8: false, **form_options do
+        monetico_paiement_fields(reference, price,
+          context: context, email: email, url_error: url_error,
+          url_success: url_success, currency: currency, locale: locale, ept: ept) + capture(&block)
+      end
+    end
+
+    def monetico_paiement_fields(reference, price, context:, email:, url_error:, url_success:, currency: 'EUR', locale: 'FR', ept: MoneticoPaiement::Ept.new)
+      attributes = ept.attributes(reference, price,
+        context: context, email: email, url_error: url_error,
+        url_success: url_success, currency: currency, locale: locale)
+
+      html = hidden_field_tag('MAC', ept.mac_string(attributes))
+
+      attributes.each do |name, value|
+        html << hidden_field_tag(name, value)
+      end
+
+      html
+    end
+  end
+end

lib/monetico_paiement/parameters.rb

@@ -0,0 +1,36 @@
+module MoneticoPaiement
+  ALLOWED_PARAMS = %i{
+    code-retour
+    MAC
+    TPE
+    montant
+    montantestime
+    reference
+    texte-libre
+    date
+    cvx
+    vld
+    brand
+    numauto
+    authentification
+    usage
+    typecompte
+    ecard
+    motifrefus
+    motifrefusautorisation
+    originecb
+    bincb
+    hpancb
+    ipclient
+    originetr
+    montantech
+    numero_dossier
+    typefacture
+    filtragecause
+    filtragevaleur
+    filtrage_etat
+    cbenregistree
+    cbmasquee
+    modepaiement
+  }
+end

lib/monetico_paiement/railtie.rb

@@ -0,0 +1,9 @@
+require 'monetico_paiement/form_helper'
+
+module MoneticoPaiement
+  class Railtie < Rails::Railtie
+    initializer "monetico_paiement.form_helpers" do
+      ActionView::Base.send :include, FormHelper
+    end
+  end
+end

monetico_paiement.gemspec

@@ -26,9 +26,11 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{\Aexe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
-  # Uncomment to register a new dependency of your gem
-  # spec.add_dependency "example-gem", "~> 1.0"
+  spec.add_dependency "openssl", "~> 2.2"
+  spec.add_dependency "json"
 
-  # For more information and examples about making a new gem, checkout our
-  # guide at: https://bundler.io/guides/creating_gem.html
+  spec.add_development_dependency "bundler", "~> 2.2"
+  spec.add_development_dependency "rake", "~> 13.0"
+  spec.add_development_dependency "irb"
+  spec.add_development_dependency "minitest"
 end