Support for Criteo

README.md

@@ -328,24 +328,48 @@ It will render the following to the site source:
 
 [Criteo](http://www.criteo.com/) retargeting service.
 
+#### Basic configuration
+
 ```
 config.middleware.use(Rack::Tracker) do
   handler :criteo, { set_account: '1234' }
 end
 ```
 
 Other global criteo handler options are:
-* `setCustomerId` (value can be a static or a dynamic, e.g. `lambda { |env| env['rack.session']['user_id'] }`)
-* `setSiteType` (`m`, `t`, `d`)
+* `set_customer_id: 'x'`
+* `set_site_type: 'd'` - possible values are `m` (mobile), `t` (tablet), `d` (desktop)
+
+Option values can be either static or dynamic by providing a lambda being reevaluated for each request, e.g. `set_customer_id: lambda { |env| env['rack.session']['user_id'] }`
+
+#### Tracking events
+
+This will track a basic event:
 
 ```
 def show
   tracker do |t|
-    t.criteo :track, { event: 'viewItem', item: 'P0001' }
+    t.criteo :view_item, { item: 'P0001' }
   end
 end
 ```
 
+This will render to the follwing code in the JS:
+
+```
+window.criteo_q.push({"event": "viewItem", "item": "P001" });
+```
+
+The first argument for `t.criteo` is always the criteo event (e.g. `:view_item`, `:view_list`, `:track_transaction`, `:view_basket`) and the second argument are additional properties for the event.
+
+Another example
+
+```
+t.criteo :track_transaction, { id: 'id', item: { id: "P0038", price: "6.54", quantity: 1 } }
+```
+
+end
+
 ### Custom Handlers
 
 Tough we give you handlers for a few tracking services right out of the box, you might

lib/rack/tracker.rb

@@ -17,6 +17,7 @@
 require "rack/tracker/facebook/facebook"
 require "rack/tracker/vwo/vwo"
 require "rack/tracker/go_squared/go_squared"
+require "rack/tracker/criteo/criteo"
 
 module Rack
   class Tracker

lib/rack/tracker/criteo/criteo.rb

@@ -0,0 +1,36 @@
+class Criteo <  Rack::Tracker::Handler
+
+  TRACKER_EVENTS = {
+    # event name => event key name, e.g. { event: 'setSiteType', type: '' }
+    set_site_type: :type,
+    set_account: :account,
+    set_customer_id: :id
+  }
+
+  class Event < OpenStruct
+    def write
+      to_h.to_json
+    end
+  end
+
+  self.position = :body
+
+  # global events (setSiteType, setAccount, ...) for each tracker instance
+  def tracker_events
+    @tracker_events ||= [].tap do |tracker_events|
+      options.slice(*TRACKER_EVENTS.keys).each do |key, value|
+        if option_value = value.respond_to?(:call) ? value.call(env) : value
+          tracker_events << Event.new(:event => "#{key}".camelize(:lower),  TRACKER_EVENTS[key] => "#{option_value}")
+        end
+      end
+    end
+  end
+
+  def render
+    Tilt.new( File.join( File.dirname(__FILE__), 'template', 'criteo.erb') ).render(self)
+  end
+
+  def self.track(name, event_name, event_args = {})
+    { name.to_s => [{ 'class_name' => 'Event', 'event' => event_name.to_s.camelize(:lower) }.merge(event_args)] }
+  end
+end

lib/rack/tracker/criteo/template/criteo.erb

@@ -0,0 +1,9 @@
+<% if events.any? %>
+<script type='text/javascript' src='//static.criteo.net/js/ld/ld.js' async='true'></script>
+<script type='text/javascript'>
+window.criteo_q = window.criteo_q || [];
+<% (tracker_events + events).each do |event| %>
+window.criteo_q.push(<%= event.write %>);
+<% end %>
+</script>
+<% end %>

spec/handler/criteo_spec.rb

@@ -0,0 +1,122 @@
+RSpec.describe Rack::Tracker::Criteo do
+
+  describe Rack::Tracker::Criteo::Event do
+
+    subject { described_class.new(event: "viewItem", item: 'P001') }
+
+    describe '#write' do
+      specify { expect(subject.write).to eq("{\"event\":\"viewItem\",\"item\":\"P001\"}") }
+    end
+  end
+
+  def env
+    {}
+  end
+
+  it 'will be placed in the body' do
+    expect(described_class.position).to eq(:body)
+    expect(described_class.new(env).position).to eq(:body)
+  end
+
+  describe '#render' do
+    context 'with events' do
+      let(:env) {
+        {
+          'tracker' => {
+          'criteo' =>
+            [
+              {
+                'event' => 'viewItem',
+                'item' => 'P001',
+                'class_name' => 'Event'
+              }
+            ]
+          }
+        }
+      }
+
+      subject { described_class.new(env).render }
+
+      it 'will push the tracking events to the queue' do
+        expect(subject).to include 'window.criteo_q.push({"event":"viewItem","item":"P001"});'
+      end
+    end
+
+    context 'without events' do
+      let(:env) {
+        {
+          'tracker' => {
+            'criteo' => []
+          }
+        }
+      }
+
+      subject { described_class.new(env, { user_id: ->(env){ '123' } }).render }
+
+      it 'should render nothing' do
+        expect(subject).to eql ""
+      end
+    end
+  end
+
+  describe '#tracker_events' do
+    subject { described_class.new(env, options) }
+
+    context 'nil value' do
+      let(:options) { { set_account: nil } }
+
+      it 'should ignore option' do
+        expect(subject.tracker_events).to match_array []
+      end
+    end
+
+    context 'static string value' do
+      let(:options) { { set_account: '1234' } }
+
+      it 'should set the value' do
+        expect(subject.tracker_events).to match_array [
+          Rack::Tracker::Criteo::Event.new(event: 'setAccount', account: '1234')
+        ]
+      end
+    end
+
+    context 'static integer value' do
+      let(:options) { { set_customer_id: 1234 } }
+
+      it 'should set the value as string' do
+        expect(subject.tracker_events).to match_array [
+          Rack::Tracker::Criteo::Event.new(event: 'setCustomerId', id: '1234')
+        ]
+      end
+    end
+
+    context 'unsupported option' do
+      let(:options) { { unsupported: "option" } }
+
+      subject { described_class.new(env, options) }
+
+      it 'should ignore the option' do
+        expect(subject.tracker_events).to match_array []
+      end
+    end
+
+    context 'proc returning value' do
+      let(:options) { { set_site_type: ->(env){ 'm' } } }
+
+      it 'should set the value' do
+        expect(subject.tracker_events).to match_array [
+          Rack::Tracker::Criteo::Event.new(event: 'setSiteType', type: 'm')
+        ]
+      end
+    end
+
+    context 'proc returning nil' do
+      let(:options) { { set_account: ->(env){ nil } } }
+
+      it 'should ignore the option' do
+        expect(subject.tracker_events).to match_array []
+      end
+    end
+  end
+
+end

spec/integration/criteo_integration_spec.rb

@@ -0,0 +1,44 @@
+require 'support/capybara_app_helper'
+
+RSpec.describe "Criteo Integration" do
+  before do
+    setup_app(action: :criteo) do |tracker|
+      tracker.handler(:criteo, {
+        set_account: '1234',
+        set_customer_id: ->(env){ '4711' },
+        set_site_type: ->(env){ 'm' }
+      })
+    end
+    visit '/'
+  end
+
+  subject { page }
+
+  it 'should include all the events' do
+    # tracker_events
+    expect(page.find("body")).to have_content "window.criteo_q.push({\"event\":\"setAccount\",\"account\":\"1234\"});"
+    expect(page.find("body")).to have_content "window.criteo_q.push({\"event\":\"setSiteType\",\"type\":\"m\"});"
+    expect(page.find("body")).to have_content "window.criteo_q.push({\"event\":\"setCustomerId\",\"id\":\"4711\"});"
+
+    # events
+    expect(page.find("body")).to have_content "window.criteo_q.push({\"event\":\"viewItem\",\"item\":\"P001\"});"
+    expect(page.find("body")).to have_content "window.criteo_q.push({\"event\":\"viewList\",\"item\":[\"P001\",\"P002\"]});"
+    expect(page.find("body")).to have_content "window.criteo_q.push({\"event\":\"trackTransaction\",\"id\":\"id\",\"item\":{\"id\":\"P0038\",\"price\":\"6.54\",\"quantity\":1}});"
+    expect(page.find("body")).to have_content "window.criteo_q.push({\"event\":\"viewBasket\",\"item\":[{\"id\":\"P001\",\"price\":\"6.54\",\"quantity\":1},{\"id\":\"P0038\",\"price\":\"2.99\",\"quantity\":1}]});"
+  end
+
+  describe 'adjust tracker position via options' do
+    before do
+      setup_app(action: :criteo) do |tracker|
+        tracker.handler :criteo, { set_account: '1234', position: :head }
+      end
+      visit '/'
+    end
+
+    it "will be placed in the specified tag" do
+     expect(page.find("body")).to_not have_content('criteo')
+     expect(page.find("head")).to have_content("{\"event\":\"setAccount\",\"account\":\"1234\"}")
+    end
+
+  end
+end

spec/support/metal_controller.rb

@@ -64,4 +64,14 @@ def go_squared
     end
     render "metal/index"
   end
+
+  def criteo
+    tracker do |t|
+      t.criteo :view_item, { item: 'P001' }
+      t.criteo :view_list, { item: ['P001', 'P002'] }
+      t.criteo :track_transaction, { id: 'id', item: { id: "P0038", price:"6.54", quantity:1 } }
+      t.criteo :view_basket, { item: [{ id: "P001", price:"6.54", quantity:1 }, { id: "P0038", price:"2.99", quantity:1 }] }
+    end
+    render 'metal/index'
+  end
 end