chore: Provider APIs for SMS Channel - Bandwidth (#3889)

fixes: #3888

app/services/sms/incoming_message_service.rb

@@ -0,0 +1,66 @@
+class Sms::IncomingMessageService
+  include ::FileTypeHelper
+
+  pattr_initialize [:inbox!, :params!]
+
+  def perform
+    set_contact
+    set_conversation
+    @message = @conversation.messages.create(
+      content: params[:text],
+      account_id: @inbox.account_id,
+      inbox_id: @inbox.id,
+      message_type: :incoming,
+      sender: @contact,
+      source_id: params[:id]
+    )
+  end
+
+  private
+
+  def account
+    @account ||= @inbox.account
+  end
+
+  def phone_number
+    params[:from]
+  end
+
+  def formatted_phone_number
+    TelephoneNumber.parse(phone_number).international_number
+  end
+
+  def set_contact
+    contact_inbox = ::ContactBuilder.new(
+      source_id: params[:from],
+      inbox: @inbox,
+      contact_attributes: contact_attributes
+    ).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.first
+    return if @conversation
+
+    @conversation = ::Conversation.create!(conversation_params)
+  end
+
+  def contact_attributes
+    {
+      name: formatted_phone_number,
+      phone_number: phone_number
+    }
+  end
+end