chore: Provider API prototype (#3112)

Enabling Support for Whatsapp via 360Dialog as a prototype for the provider APIs. 

Co-authored-by: Pranav Raj S <pranav@chatwoot.com>

spec/services/whatsapp/incoming_message_service_spec.rb

@@ -0,0 +1,21 @@
+require 'rails_helper'
+
+describe Whatsapp::IncomingMessageService do
+  let!(:whatsapp_channel) { create(:channel_whatsapp) }
+
+  describe '#perform' do
+    context 'when valid text message params' do
+      it 'creates appropriate conversations, message and contacts' do
+        params = {
+          'contacts' => [{ 'profile' => { 'name' => 'Sojan Jose' }, 'wa_id' => '2423423243' }],
+          'messages' => [{ 'from' => '2423423243', 'id' => 'SDFADSf23sfasdafasdfa', 'text' => { 'body' => 'Test' },
+                           'timestamp' => '1633034394', 'type' => 'text' }]
+        }.with_indifferent_access
+        described_class.new(inbox: whatsapp_channel.inbox, params: params).perform
+        expect(whatsapp_channel.inbox.conversations.count).not_to eq(0)
+        expect(Contact.all.first.name).to eq('Sojan Jose')
+        expect(whatsapp_channel.inbox.messages.first.content).to eq('Test')
+      end
+    end
+  end
+end

spec/services/whatsapp/send_on_whatsapp_service_spec.rb

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+require 'rails_helper'
+
+describe Whatsapp::SendOnWhatsappService do
+  describe '#perform' do
+    context 'when a valid message' do
+      it 'calls channel.send_message' do
+        whatsapp_request = double
+        whatsapp_channel = create(:channel_whatsapp)
+        contact_inbox = create(:contact_inbox, inbox: whatsapp_channel.inbox, source_id: '123456789')
+        conversation = create(:conversation, contact_inbox: contact_inbox, inbox: whatsapp_channel.inbox)
+        message = create(:message, message_type: :outgoing, content: 'test',
+                                   conversation: conversation)
+        allow(HTTParty).to receive(:post).and_return(whatsapp_request)
+        expect(HTTParty).to receive(:post).with(
+          'https://waba.360dialog.io/v1/messages',
+          headers: { 'D360-API-KEY': 'test_key', 'Content-Type': 'application/json' },
+          body: { to: '123456789', text: { body: 'test' }, type: 'text' }.to_json
+        )
+        described_class.new(message: message).perform
+      end
+    end
+  end
+end