Webflow Customization

CAS uses Spring Webflow to do script processing of login and logout protocols. Spring Web Flow builds on Spring MVC and allows implementing the “flows” of a web application. A flow encapsulates a sequence of steps that guide a user through the execution of some business task. It spans multiple HTTP requests, has state, deals with transactional data, is reusable, and may be dynamic and long-running in nature. Each flow may contain among many other settings the following major elements:

  • Actions: components that describe an executable task and return back a result
  • Transitions: Routing the flow from one state to another; Transitions may be global to the entire flow.
  • Views: Components that describe the presentation layer displayed back to the client
  • Decisions: Components that conditionally route to other areas of flow and can make logical decisions

Spring Web Flow presents CAS with a pluggable architecture where custom actions, views and decisions may be injected into the flow to account for additional use cases and processes. Note that to customize the webflow, one must possess a reasonable level of understanding of the webflow internals and injection policies. The intention of this document is NOT to describe Spring Web Flow, but merely to demonstrate how the framework is used by CAS to carry out various aspects of the protocol and business logic execution.

Webflow Session

See this guide for more info.

Webflow Auto Configuration

Most CAS modules, when declared as a dependency, attempt to autoconfigure the CAS webflow to suit their needs. This practically means that the CAS adopter would no longer have to manually massage the CAS webflow configuration, and the module automatically takes care of all required changes. While this is the default behavior, it is possible that you may want to manually handle all such changes. For doing so, you will need to disable the CAS auto-configuration of the webflow.

The following settings and properties are available from the CAS configuration catalog:

The configuration settings listed below are tagged as Required in the CAS configuration metadata. This flag indicates that the presence of the setting may be needed to activate or affect the behavior of the CAS feature and generally should be reviewed, possibly owned and adjusted. If the setting is assigned a default value, you do not need to strictly put the setting in your copy of the configuration, but should review it nonetheless to make sure it matches your deployment expectations.

The configuration settings listed below are tagged as Optional in the CAS configuration metadata. This flag indicates that the presence of the setting is not immediately necessary in the end-user CAS configuration, because a default value is assigned or the activation of the feature is not conditionally controlled by the setting value. You should only include this field in your configuration if you need to modify the default value.

  • cas.webflow.auto-configuration.enabled=true
  • Whether webflow auto-configuration should be enabled.

    org.apereo.cas.configuration.model.core.web.flow.WebflowAutoConfigurationProperties.

  • cas.webflow.auto-configuration.order=0
  • The order in which the webflow is configured.

    org.apereo.cas.configuration.model.core.web.flow.WebflowAutoConfigurationProperties.