Restructure omni services and add Chatwoot research snapshot

research/chatwoot/app/controllers/tiktok/callbacks_controller.rb

@@ -0,0 +1,144 @@
+class Tiktok::CallbacksController < ApplicationController
+  include Tiktok::IntegrationHelper
+
+  def show
+    return handle_authorization_error if params[:error].present?
+    return handle_ungranted_scopes_error unless all_scopes_granted?
+
+    process_successful_authorization
+  rescue StandardError => e
+    handle_error(e)
+  end
+
+  private
+
+  def all_scopes_granted?
+    granted_scopes = short_term_access_token[:scope].to_s.split(',')
+    (Tiktok::AuthClient::REQUIRED_SCOPES - granted_scopes).blank?
+  end
+
+  def process_successful_authorization
+    inbox, already_exists = find_or_create_inbox
+
+    if already_exists
+      redirect_to app_tiktok_inbox_settings_url(account_id: account_id, inbox_id: inbox.id)
+    else
+      redirect_to app_tiktok_inbox_agents_url(account_id: account_id, inbox_id: inbox.id)
+    end
+  end
+
+  def handle_error(error)
+    Rails.logger.error("TikTok Channel creation Error: #{error.message}")
+    ChatwootExceptionTracker.new(error).capture_exception
+
+    redirect_to_error_page(error_type: error.class.name, code: 500, error_message: error.message)
+  end
+
+  # Handles the case when a user denies permissions or cancels the authorization flow
+  def handle_authorization_error
+    redirect_to_error_page(
+      error_type: params[:error] || 'access_denied',
+      code: params[:error_code],
+      error_message: params[:error_description] || 'User cancelled the Authorization'
+    )
+  end
+
+  # Handles the case when a user partially accepted the required scopes
+  def handle_ungranted_scopes_error
+    redirect_to_error_page(
+      error_type: 'ungranted_scopes',
+      code: 400,
+      error_message: 'User did not grant all the required scopes'
+    )
+  end
+
+  # Centralized method to redirect to error page with appropriate parameters
+  # This ensures consistent error handling across different error scenarios
+  # Frontend will handle the error page based on the error_type
+  def redirect_to_error_page(error_type:, code:, error_message:)
+    redirect_to app_new_tiktok_inbox_url(
+      account_id: account_id,
+      error_type: error_type,
+      code: code,
+      error_message: error_message
+    )
+  end
+
+  def find_or_create_inbox
+    business_details = tiktok_client.business_account_details
+    channel_tiktok = find_channel
+    channel_exists = channel_tiktok.present?
+
+    if channel_tiktok
+      update_channel(channel_tiktok, business_details)
+    else
+      channel_tiktok = create_channel_with_inbox(business_details)
+    end
+
+    # reauthorized will also update cache keys for the associated inbox
+    channel_tiktok.reauthorized!
+
+    set_avatar(channel_tiktok.inbox, business_details[:profile_image]) if business_details[:profile_image].present?
+
+    [channel_tiktok.inbox, channel_exists]
+  end
+
+  def create_channel_with_inbox(business_details)
+    ActiveRecord::Base.transaction do
+      channel_tiktok = Channel::Tiktok.create!(
+        account: account,
+        business_id: short_term_access_token[:business_id],
+        access_token: short_term_access_token[:access_token],
+        refresh_token: short_term_access_token[:refresh_token],
+        expires_at: short_term_access_token[:expires_at],
+        refresh_token_expires_at: short_term_access_token[:refresh_token_expires_at]
+      )
+
+      account.inboxes.create!(
+        account: account,
+        channel: channel_tiktok,
+        name: business_details[:display_name].presence || business_details[:username]
+      )
+
+      channel_tiktok
+    end
+  end
+
+  def find_channel
+    Channel::Tiktok.find_by(business_id: short_term_access_token[:business_id], account: account)
+  end
+
+  def update_channel(channel_tiktok, business_details)
+    channel_tiktok.update!(
+      access_token: short_term_access_token[:access_token],
+      refresh_token: short_term_access_token[:refresh_token],
+      expires_at: short_term_access_token[:expires_at],
+      refresh_token_expires_at: short_term_access_token[:refresh_token_expires_at]
+    )
+
+    channel_tiktok.inbox.update!(name: business_details[:display_name].presence || business_details[:username])
+  end
+
+  def set_avatar(inbox, avatar_url)
+    Avatar::AvatarFromUrlJob.perform_later(inbox, avatar_url)
+  end
+
+  def account_id
+    @account_id ||= verify_tiktok_token(params[:state])
+  end
+
+  def account
+    @account ||= Account.find(account_id)
+  end
+
+  def short_term_access_token
+    @short_term_access_token ||= Tiktok::AuthClient.obtain_short_term_access_token(params[:code])
+  end
+
+  def tiktok_client
+    @tiktok_client ||= Tiktok::Client.new(
+      business_id: short_term_access_token[:business_id],
+      access_token: short_term_access_token[:access_token]
+    )
+  end
+end