Spree : oauth : Import Shipping/Billing Address along with PaymentSource from Doorkeeper app

If you already have billing/shipping address and payment info of the store in the OAuth provider [eg. some app with Doorkeeper]; and you don’t want to let your users go through  the hassle to fill the form all over again, then, you can reuse the data. For this, you need to return the info along with user info from the OAuth provider in the response.

# in /app/models/spree/user_decorator.rb
class << self
  def from_omniauth(auth_data)
    spree_user = get_or_set_user(auth_data)

    # Extract address info from the payload and update
    #  can update only shipping or both address with same data
    set_shipping_address(spree_user, auth_data) if spree_user.ship_address.nil?
    set_billing_address (spree_user, auth_data) if spree_user.bill_address.nil?
    
    # You might also import PaymentSource info from parent app
    #   Ex: User has already submitted payment info [CreditCard info] and
    #   and you have Stripe PaymentSource Id, then you can import the data
    #   along with other info. I recommend you to use HTTPS for this. 
    set_payment_source(spree_user, auth_data) if spree_user.payment_sources.blank?
 
    # Set user's role; say in parent app the user is Admin, then you
    #  might want to set that user as an Admin in child app as well.
    #  See the function definition below
    set_roles(spree_user, auth_data)
    
    # Need to return the user object
    spree_user
  end

  private
  # all the methods assisting 'from_omniauth' will go below here

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