feat: Line Channel (#2904)

- Ability to configure line bots as a channel in chatwoot
- Receive a message sent to the line bot in chatwoot
- Ability to reply to line users from chatwoot

fixes: #2738

app/services/line/incoming_message_service.rb

@@ -0,0 +1,65 @@
+class Line::IncomingMessageService
+  include ::FileTypeHelper
+  pattr_initialize [:inbox!, :params!]
+
+  def perform
+    line_contact_info
+    set_contact
+    set_conversation
+    # TODO: iterate over the events and handle the attachments in future
+    # https://github.com/line/line-bot-sdk-ruby#synopsis
+    @message = @conversation.messages.create(
+      content: params[:events].first['message']['text'],
+      account_id: @inbox.account_id,
+      inbox_id: @inbox.id,
+      message_type: :incoming,
+      sender: @contact,
+      source_id: (params[:events].first['message']['id']).to_s
+    )
+    @message.save!
+  end
+
+  private
+
+  def account
+    @account ||= inbox.account
+  end
+
+  def line_contact_info
+    @line_contact_info ||= JSON.parse(inbox.channel.client.get_profile(params[:events].first['source']['userId']).body)
+  end
+
+  def set_contact
+    contact_inbox = ::ContactBuilder.new(
+      source_id: line_contact_info['userId'],
+      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: line_contact_info['displayName'],
+      avatar_url: line_contact_info['pictureUrl']
+    }
+  end
+end

app/services/line/send_on_line_service.rb

@@ -0,0 +1,11 @@
+class Line::SendOnLineService < Base::SendOnChannelService
+  private
+
+  def channel_class
+    Channel::Line
+  end
+
+  def perform_reply
+    channel.client.push_message(message.conversation.contact_inbox.source_id, [{ type: 'text', text: message.content }])
+  end
+end