class Doorkeeper::OAuth::PasswordAccessTokenRequest

def before_successful_response
  find_or_create_access_token(client, resource_owner, scopes, {}, server)
  super
end

def initialize(server, client, credentials, resource_owner, parameters = {})
  @server          = server
  @resource_owner  = resource_owner
  @client          = client
  @credentials     = credentials
  @parameters      = parameters
  @original_scopes = parameters[:scope]
  @grant_type      = Doorkeeper::OAuth::PASSWORD
end

def validate_client
  if Doorkeeper.config.skip_client_authentication_for_password_grant
    client.present? || (!parameters[:client_id] && credentials.blank?)
  else
    client.present?
  end
end

def validate_client_supports_grant_flow
  Doorkeeper.config.allow_grant_flow_for_client?(grant_type, client&.application)
end

def validate_resource_owner
  resource_owner.present?
end

def validate_scopes
  return true if scopes.blank?
  ScopeChecker.valid?(
    scope_str: scopes.to_s,
    server_scopes: server.scopes,
    app_scopes: client.try(:scopes),
    grant_type: grant_type,
  )
end