Class: AtomicTenant::CurrentApplicationInstanceMiddleware

Inherits:
Object
  • Object
show all
Includes:
JwtToken
Defined in:
lib/atomic_tenant/current_application_instance_middleware.rb

Constant Summary

Constants included from JwtToken

JwtToken::ALGORITHM

Instance Method Summary collapse

Methods included from JwtToken

decode

Constructor Details

#initialize(app) ⇒ CurrentApplicationInstanceMiddleware

Returns a new instance of CurrentApplicationInstanceMiddleware.



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# File 'lib/atomic_tenant/current_application_instance_middleware.rb', line 8

def initialize(app)
  @app = app
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/atomic_tenant/current_application_instance_middleware.rb', line 12

def call(env)
  begin
    request = Rack::Request.new(env)

    if env['atomic.validated.oauth_consumer_key'].present?
      oauth_consumer_key = env['atomic.validated.oauth_consumer_key']
      if ai = ApplicationInstance.find_by(lti_key: oauth_consumer_key)
        env['atomic.validated.application_instance_id'] = ai.id
      end
    elsif env['atomic.validated.id_token'].present?

      custom_strategies = AtomicTenant.custom_strategies || []
      default_strategies = [
        AtomicTenant::DeploymentManager::PlatformGuidStrategy.new,
        AtomicTenant::DeploymentManager::ClientIdStrategy.new
      ]

      deployment_manager = AtomicTenant::DeploymentManager::DeploymentManager.new(custom_strategies.concat(default_strategies))
      decoded_token = env['atomic.validated.decoded_id_token']
      iss = env['atomic.validated.decoded_id_token']['iss']
      deployment_id = env['atomic.validated.decoded_id_token'][AtomicLti::Definitions::DEPLOYMENT_ID]

      if deployment = AtomicTenant::LtiDeployment.find_by(iss: iss, deployment_id: deployment_id)
        env['atomic.validated.application_instance_id'] = deployment.application_instance_id
      else
        deployment = deployment_manager.link_deployment_id(decoded_id_token: decoded_token)
        env['atomic.validated.application_instance_id'] = deployment.application_instance_id
      end
    elsif env.dig('oauth_state', 'application_instance_id').present?
      env['atomic.validated.application_instance_id'] = env['oauth_state']['application_instance_id']
    elsif is_admin?(request)
      admin_app_key = AtomicTenant.admin_subdomain
      admin_app = Application.find_by(key: admin_app_key)

      raise Exceptions::NoAdminApp if admin_app.nil?

      app_instances = admin_app.application_instances

      raise Exceptions::NonUniqueAdminApp if app_instances.count > 1
      raise Exceptions::NoAdminApp if app_instances.empty?

      if instance = app_instances.first
        env['atomic.validated.application_instance_id'] = instance.id
      end
    elsif canvas_migration_hook?(request)
      app_instance = AtomicTenant::CanvasContentMigration.decode(encoded_token(request))
      env['atomic.validated.application_instance_id'] = app_instance.id
    elsif encoded_token(request).present?
      token = encoded_token(request)
      # We don't validate the token here because this step is only designed to set
      # the tenant for the request. If the token is invalid or expired the app must
      # return 401 or take other action.
      decoded_token = AtomicTenant::JwtToken.decode(token, validate: false)
      if decoded_token.present? && decoded_token.first.present? && app_instance_id = decoded_token.first['application_instance_id']
        env['atomic.validated.application_instance_id'] = app_instance_id
      end
    end
  rescue StandardError => e
    Rails.logger.error("Error in current app instance middleware: #{e}, #{e.backtrace}")
  end

  @app.call(env)
end

#canvas_migration_hook?(request) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/atomic_tenant/current_application_instance_middleware.rb', line 87

def canvas_migration_hook?(request)
  true if request.path.match?(%r{^/api/ims_(import|export)})
end

#encoded_token(req) ⇒ Object 



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# File 'lib/atomic_tenant/current_application_instance_middleware.rb', line 91

def encoded_token(req)
  return req.params['jwt'] if req.params['jwt']

  # TODO: verify HTTP_AUTORIZAITON is the same as "Authorization"
  return unless header = req.get_header('HTTP_AUTHORIZATION') # || req.headers[:authorization]

  header.split(' ').last
end

#is_admin?(request) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/atomic_tenant/current_application_instance_middleware.rb', line 76

def is_admin?(request)
  return true if request.path == '/readiness'

  host = request.host_with_port
  subdomain = host&.split('.')&.first

  return false if subdomain.nil?

  subdomain == AtomicTenant.admin_subdomain
end