Document CORS support for the IntegrationGraphController [INT-4035]

[spring-operator]

Artem Bilan opened INT-4035 and commented

The Integration Graph can be accessed from any any Web application as an embedded content, e.g. Spring-Flo project can use the result JSON representation to draw the real graph from Spring Integration runtime.

Therefore our REST resource should provide the CORS options to let trusted domains to get access to the data.

Also see Spring Framework Reference Manual for more information.

---

Issue Links:

• Consider Automatically Registering the CORS Configurer Bean for Flo [INT-4139] #8083 Consider Automatically Registering the CORS Configurer Bean for Flo

Referenced from: pull request #1810

[spring-operator]

Artem Bilan commented

The issue comes to the Documentation purpose.
No reason to introduce anything new, since regular Spring MVC provides everything what we need, e.g. XML config may looks like:

<mvc:annotation-driven />

<mvc:cors>
	<mvc:mapping path="/foo/**"
				 allowed-origins="http://foo.bar.com"
				 allowed-methods="GET" />
</mvc:cors>

<graph-controller path="/foo" />

The Java Config is pretty simple as well:

@Configuration
@EnableWebMvc
@EnableIntegration
@EnableIntegrationGraphController(path = "/testIntegration")
public class ContextConfiguration extends WebMvcConfigurerAdapter {

	@Override
	public void addCorsMappings(CorsRegistry registry) {
		registry.addMapping("/testIntegration/**")
				.allowedOrigins("http://foo.bar.com")
				.allowedMethods(HttpMethod.GET.name());
        }

}

See #7955 about the general Integration Graph documentation.