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>

app/services/contacts/contactable_inboxes_service.rb

@@ -9,12 +9,18 @@ class Contacts::ContactableInboxesService
   private
 
   def get_contactable_inbox(inbox)
-    return twilio_contactable_inbox(inbox) if inbox.channel_type == 'Channel::TwilioSms'
-    return email_contactable_inbox(inbox) if inbox.channel_type == 'Channel::Email'
-    return api_contactable_inbox(inbox) if inbox.channel_type == 'Channel::Api'
-    return website_contactable_inbox(inbox) if inbox.channel_type == 'Channel::WebWidget'
-
-    nil
+    case inbox.channel_type
+    when 'Channel::TwilioSms'
+      twilio_contactable_inbox(inbox)
+    when 'Channel::Whatsapp'
+      whatsapp_contactable_inbox(inbox)
+    when 'Channel::Email'
+      email_contactable_inbox(inbox)
+    when 'Channel::Api'
+      api_contactable_inbox(inbox)
+    when 'Channel::WebWidget'
+      website_contactable_inbox(inbox)
+    end
   end
 
   def website_contactable_inbox(inbox)
@@ -39,6 +45,13 @@ class Contacts::ContactableInboxesService
     { source_id: @contact.email, inbox: inbox }
   end
 
+  def whatsapp_contactable_inbox(inbox)
+    return unless @contact.phone_number
+
+    # Remove the plus since thats the format 360 dialog uses
+    { source_id: @contact.phone_number.delete('+'), inbox: inbox }
+  end
+
   def twilio_contactable_inbox(inbox)
     return if @contact.phone_number.blank?
 

app/services/whatsapp/incoming_message_service.rb

@@ -0,0 +1,61 @@
+# Find the various telegram payload samples here: https://core.telegram.org/bots/webhooks#testing-your-bot-with-updates
+# https://core.telegram.org/bots/api#available-types
+
+class Whatsapp::IncomingMessageService
+  pattr_initialize [:inbox!, :params!]
+
+  def perform
+    set_contact
+    return unless @contact
+
+    set_conversation
+
+    return if params[:messages].blank?
+
+    @message = @conversation.messages.create(
+      content: params[:messages].first.dig(:text, :body),
+      account_id: @inbox.account_id,
+      inbox_id: @inbox.id,
+      message_type: :incoming,
+      sender: @contact,
+      source_id: params[:messages].first[:id].to_s
+    )
+    @message.save!
+  end
+
+  private
+
+  def account
+    @account ||= inbox.account
+  end
+
+  def set_contact
+    contact_params = params[:contacts]&.first
+    return if contact_params.blank?
+
+    contact_inbox = ::ContactBuilder.new(
+      source_id: contact_params[:wa_id],
+      inbox: inbox,
+      contact_attributes: { name: contact_params.dig(:profile, :name), phone_number: "+#{params[:messages].first[:from]}" }
+    ).perform
+
+    @contact_inbox = contact_inbox
+    @contact = contact_inbox.contact
+  end
+
+  def conversation_params
+    {
+      account_id: @inbox.account_id,
+      inbox_id: @inbox.id,
+      contact_id: @contact.id,
+      contact_inbox_id: @contact_inbox.id
+    }
+  end
+
+  def set_conversation
+    @conversation = @contact_inbox.conversations.last
+    return if @conversation
+
+    @conversation = ::Conversation.create!(conversation_params)
+  end
+end

app/services/whatsapp/send_on_whatsapp_service.rb

@@ -0,0 +1,11 @@
+class Whatsapp::SendOnWhatsappService < Base::SendOnChannelService
+  private
+
+  def channel_class
+    Channel::Whatsapp
+  end
+
+  def perform_reply
+    channel.send_message(message.conversation.contact_inbox.source_id, message.content)
+  end
+end