OpenAPI / Swagger
In HAPI FHIR, support for OpenAPI (aka Swagger) is supported via the OpenApiInterceptor.
Note that this interceptor supports servers using the RestfulServer (aka HAPI FHIR Plain Server and JPA Server), and does not currently support JAX-RS servers.
When this interceptor is registered against the server, it performs the following 3 tasks:
[baseUrl]/api-docs. This documentation is generated by the interceptor using information from the server's CapabilityStatement as well as from its automatically generated OperationDefinitions.Anytime a user using a browser navigates to the Base URL of the server, they will be automatically redirected to [baseUrl]/swagger-ui/
A customized version of the Swagger UI tool will be served at [baseUrl]/swagger-ui/
The HAPI FHIR OpenAPI functionality is supplied in a dedicated module called hapi-fhir-server-openapi. To enable this functionality you must first include this module in your project. For example, Maven users should include the following dependency:
<dependency>
<groupId>ca.uhn.hapi.fhir</groupId>
<artifactId>hapi-fhir-server-openapi</artifactId>
<version>VERSION</version>
</dependency>
You then simply have to register the interceptor against your RestfulServer instance.
@WebServlet(urlPatterns = { "/fhir/*" }, displayName = "FHIR Server")
public class RestfulServerWithOpenApi extends RestfulServer {
@Override
protected void initialize() throws ServletException {
// ... define your resource providers here ...
// Now register the interceptor
OpenApiInterceptor openApiInterceptor = new OpenApiInterceptor();
registerInterceptor(openApiInterceptor);
}
}
See the HAPI FHIR Test Server for a demonstration of HAPI FHIR OpenAPI functionality: http://hapi.fhir.org/baseR4/swagger-ui/