allow interceptors to be registered via properties

README.md

@@ -251,6 +251,16 @@ Because the integration tests within the project rely on the default H2 database
 NOTE: MS SQL Server by default uses a case-insensitive codepage. This will cause errors with some operations - such as when expanding case-sensitive valuesets (UCUM) as there are unique indexes defined on the terminology tables for codes.
 It is recommended to deploy a case-sensitive database prior to running HAPI FHIR when using MS SQL Server to avoid these and potentially other issues.
 
+## Adding custom interceptors
+Custom interceptors can be registered with the server by including the property `hapi.fhir.custom-interceptor-classes`. This will take a comma separated list of fully-qualified class names which will be registered with the server. 
+Interceptors will be discovered in one of two ways: 
+
+1) discovered from the Spring application context as existing Beans (can be used in conjunction with `hapi.fhir.custom-bean-packages`) or registered with Spring via other methods
+
+or 
+
+2) classes will be instantiated via reflection if no matching Bean is found
+
 ## Customizing The Web Testpage UI
 
 The UI that comes with this server is an exact clone of the server available at [http://hapi.fhir.org](http://hapi.fhir.org). You may skin this UI if you'd like. For example, you might change the introductory text or replace the logo with your own.

src/main/java/ca/uhn/fhir/jpa/starter/AppProperties.java

@@ -83,6 +83,12 @@ public class AppProperties {
   private Integer bundle_batch_pool_max_size = 100;
   private final List<String> local_base_urls = new ArrayList<>();
   
+  private final List<String> custom_interceptor_classes = new ArrayList<>();
+
+  public List<String> getCustomInterceptorClasses() {
+    return custom_interceptor_classes;
+  }
+
 	public Boolean getOpenapi_enabled() {
 		return openapi_enabled;
 	}

src/main/java/ca/uhn/fhir/jpa/starter/common/StarterJpaConfig.java

@@ -63,9 +63,11 @@ import ca.uhn.fhir.validation.ResultSeverityEnum;
 import com.google.common.base.Strings;
 import com.google.common.collect.ImmutableList;
 import org.hl7.fhir.common.hapi.validation.support.CachingValidationSupport;
+import org.springframework.beans.factory.NoSuchBeanDefinitionException;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.context.ApplicationContext;
 import org.springframework.context.annotation.*;
 import org.springframework.core.env.ConfigurableEnvironment;
 import org.springframework.http.HttpHeaders;
@@ -75,11 +77,14 @@ import org.springframework.web.cors.CorsConfiguration;
 
 import javax.persistence.EntityManagerFactory;
 import javax.sql.DataSource;
+
 import java.util.*;
 
 import static ca.uhn.fhir.jpa.starter.common.validation.IRepositoryValidationInterceptorFactory.ENABLE_REPOSITORY_VALIDATING_INTERCEPTOR;
 
 @Configuration
+//allow users to configure custom packages to scan for additional beans
+@ComponentScan(basePackages = { "${hapi.fhir.custom-bean-packages:}" })
 @Import(
     ThreadPoolFactoryConfig.class
 )
@@ -243,11 +248,9 @@ public class StarterJpaConfig {
 	}
 
 	@Bean
-	public RestfulServer restfulServer(IFhirSystemDao<?, ?> fhirSystemDao, AppProperties appProperties, DaoRegistry daoRegistry, Optional<MdmProviderLoader> mdmProviderProvider, IJpaSystemProvider jpaSystemProvider, ResourceProviderFactory resourceProviderFactory, DaoConfig daoConfig, ISearchParamRegistry searchParamRegistry, IValidationSupport theValidationSupport, DatabaseBackedPagingProvider databaseBackedPagingProvider, LoggingInterceptor loggingInterceptor, Optional<TerminologyUploaderProvider> terminologyUploaderProvider, Optional<SubscriptionTriggeringProvider> subscriptionTriggeringProvider, Optional<CorsInterceptor> corsInterceptor, IInterceptorBroadcaster interceptorBroadcaster, Optional<BinaryAccessProvider> binaryAccessProvider, BinaryStorageInterceptor binaryStorageInterceptor, IValidatorModule validatorModule, Optional<GraphQLProvider> graphQLProvider, BulkDataExportProvider bulkDataExportProvider, BulkDataImportProvider bulkDataImportProvider, ValueSetOperationProvider theValueSetOperationProvider, ReindexProvider reindexProvider, PartitionManagementProvider partitionManagementProvider, Optional<RepositoryValidatingInterceptor> repositoryValidatingInterceptor, IPackageInstallerSvc packageInstallerSvc, ThreadSafeResourceDeleterSvc theThreadSafeResourceDeleterSvc) {
+	public RestfulServer restfulServer(IFhirSystemDao<?, ?> fhirSystemDao, AppProperties appProperties, DaoRegistry daoRegistry, Optional<MdmProviderLoader> mdmProviderProvider, IJpaSystemProvider jpaSystemProvider, ResourceProviderFactory resourceProviderFactory, DaoConfig daoConfig, ISearchParamRegistry searchParamRegistry, IValidationSupport theValidationSupport, DatabaseBackedPagingProvider databaseBackedPagingProvider, LoggingInterceptor loggingInterceptor, Optional<TerminologyUploaderProvider> terminologyUploaderProvider, Optional<SubscriptionTriggeringProvider> subscriptionTriggeringProvider, Optional<CorsInterceptor> corsInterceptor, IInterceptorBroadcaster interceptorBroadcaster, Optional<BinaryAccessProvider> binaryAccessProvider, BinaryStorageInterceptor binaryStorageInterceptor, IValidatorModule validatorModule, Optional<GraphQLProvider> graphQLProvider, BulkDataExportProvider bulkDataExportProvider, BulkDataImportProvider bulkDataImportProvider, ValueSetOperationProvider theValueSetOperationProvider, ReindexProvider reindexProvider, PartitionManagementProvider partitionManagementProvider, Optional<RepositoryValidatingInterceptor> repositoryValidatingInterceptor, IPackageInstallerSvc packageInstallerSvc, ThreadSafeResourceDeleterSvc theThreadSafeResourceDeleterSvc, ApplicationContext appContext) {
 		RestfulServer fhirServer = new RestfulServer(fhirSystemDao.getContext());
 
-
-
 		List<String> supportedResourceTypes = appProperties.getSupported_resource_types();
 
 		if (!supportedResourceTypes.isEmpty()) {
@@ -410,15 +413,52 @@ public class StarterJpaConfig {
 			fhirServer.setTenantIdentificationStrategy(new UrlBaseTenantIdentificationStrategy());
 			fhirServer.registerProviders(partitionManagementProvider);
 		}
-
-
 		repositoryValidatingInterceptor.ifPresent(fhirServer::registerInterceptor);
 
-
+		// register custom interceptors
+		registerCustomInterceptors(fhirServer, appContext, appProperties.getCustomInterceptorClasses());
 
 		return fhirServer;
 	}
 
+	/**
+	 * check the properties for custom interceptor classes and registers them.
+	 */
+	@SuppressWarnings({ "unchecked", "rawtypes" })
+	private void registerCustomInterceptors(RestfulServer fhirServer, ApplicationContext theAppContext, List<String> customInterceptorClasses) {
+
+		if (customInterceptorClasses == null) {
+			return;
+		}
+
+		for (String className : customInterceptorClasses) {
+			Class clazz;
+			try {
+				clazz = Class.forName(className);
+			} catch (ClassNotFoundException e) {
+				throw new ConfigurationException("Interceptor class was not found on classpath: " + className, e);
+			}
+
+			// first check if the class a Bean in the app context
+			Object interceptor = null;
+			try {
+				interceptor = theAppContext.getBean(clazz);
+			} catch (NoSuchBeanDefinitionException ex) {
+				// no op - if it's not a bean we'll try to create it
+			}
+
+			// if not a bean, instantiate the interceptor via reflection
+			if (interceptor == null) {
+				try {
+					interceptor = clazz.getConstructor().newInstance();
+				} catch (Exception e) {
+					throw new ConfigurationException("Unable to instantiate interceptor class : " + className, e);
+				}
+			}
+			fhirServer.registerInterceptor(interceptor);
+		}
+	}
+
 	public static IServerConformanceProvider<?> calculateConformanceProvider(IFhirSystemDao fhirSystemDao, RestfulServer fhirServer, DaoConfig daoConfig, ISearchParamRegistry searchParamRegistry, IValidationSupport theValidationSupport) {
 		FhirVersionEnum fhirVersion = fhirSystemDao.getContext().getVersion().getVersion();
 		if (fhirVersion == FhirVersionEnum.DSTU2) {

src/main/resources/application.yaml

@@ -132,6 +132,14 @@ hapi:
     search-coord-max-pool-size: 100
     search-coord-queue-capacity: 200
     
+    # comma-separated package names, will be @ComponentScan'ed by Spring to allow for creating custom Spring beans
+    #custom-bean-packages:
+    
+    # comma-separated list of fully qualified interceptor classes. 
+    # classes listed here will be fetched from the Spring context when combined with 'custom-bean-packages', 
+    # or will be instantiated via reflection using an no-arg contructor; then registered with the server  
+    #custom-interceptor-classes:  
+
     # Threadpool size for BATCH'ed GETs in a bundle.
     #    bundle_batch_pool_size: 10
     #    bundle_batch_pool_max_size: 50

src/test/java/ca/uhn/fhir/jpa/starter/CustomBeanTest.java

@@ -0,0 +1,24 @@
+package ca.uhn.fhir.jpa.starter;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT, classes = Application.class, properties = {
+		"hapi.fhir.custom-bean-packages=some.custom.pkg1,some.custom.pkg2",
+		"spring.datasource.url=jdbc:h2:mem:dbr4",
+		// "hapi.fhir.enable_repository_validating_interceptor=true",
+		"hapi.fhir.fhir_version=r4"
+})
+public class CustomBeanTest {
+
+	@Autowired
+	some.custom.pkg1.CustomBean customBean1;
+
+	@Test
+	void testCustomBeanExists() {
+		Assertions.assertNotNull(customBean1);
+		Assertions.assertEquals("I am alive", customBean1.getInitFlag());
+	}
+}

src/test/java/ca/uhn/fhir/jpa/starter/CustomInterceptorTest.java

@@ -0,0 +1,64 @@
+package ca.uhn.fhir.jpa.starter;
+
+import org.hl7.fhir.r4.model.Patient;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.web.server.LocalServerPort;
+
+import ca.uhn.fhir.context.FhirContext;
+import ca.uhn.fhir.jpa.api.dao.IFhirResourceDao;
+import ca.uhn.fhir.rest.client.api.IGenericClient;
+import ca.uhn.fhir.rest.client.api.ServerValidationModeEnum;
+
+@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT, classes = Application.class, properties = {
+		"hapi.fhir.custom-bean-packages=some.custom.pkg1",
+		"hapi.fhir.custom-interceptor-classes=some.custom.pkg1.CustomInterceptorBean,some.custom.pkg1.CustomInterceptorPojo",
+		"spring.datasource.url=jdbc:h2:mem:dbr4",
+		// "hapi.fhir.enable_repository_validating_interceptor=true",
+		"hapi.fhir.fhir_version=r4"
+})
+
+public class CustomInterceptorTest {
+
+	@LocalServerPort
+	private int port;
+
+	@Autowired
+	private IFhirResourceDao<Patient> patientResourceDao;
+
+	private IGenericClient client;
+	private FhirContext ctx;
+
+	@BeforeEach
+	void setUp() {
+		ctx = FhirContext.forR4();
+		ctx.getRestfulClientFactory().setServerValidationMode(ServerValidationModeEnum.NEVER);
+		ctx.getRestfulClientFactory().setSocketTimeout(1200 * 1000);
+		String ourServerBase = "http://localhost:" + port + "/fhir/";
+		client = ctx.newRestfulGenericClient(ourServerBase);
+
+		// Properties props = new Properties();
+		// props.put("spring.autoconfigure.exclude", "org.springframework.boot.autoconfigure.security.servlet.SecurityAutoConfiguration");
+	}
+
+	@Test
+	void testAuditInterceptors() {
+
+		// we registered two custom interceptors via the property 'hapi.fhir.custom-interceptor-classes'
+		// one is discovered as a Spring Bean, one instantiated via reflection
+		// both should be registered with the server and will add a custom extension to any Patient resource created
+		// so we can verify they were registered
+
+		Patient pat = new Patient();
+		String patId = client.create().resource(pat).execute().getId().getIdPart();
+
+		Patient readPat = client.read().resource(Patient.class).withId(patId).execute();
+
+		Assertions.assertNotNull(readPat.getExtensionByUrl("http://some.custom.pkg1/CustomInterceptorBean"));
+		Assertions.assertNotNull(readPat.getExtensionByUrl("http://some.custom.pkg1/CustomInterceptorPojo"));
+
+	}
+}

src/test/java/some/custom/pkg1/CustomBean.java

@@ -0,0 +1,18 @@
+package some.custom.pkg1;
+
+import org.springframework.stereotype.Component;
+
+@Component
+public class CustomBean {
+
+	private String initFlag;
+
+	public CustomBean() {
+		initFlag = "I am alive";
+	}
+
+	public String getInitFlag() {
+		return initFlag;
+	}
+
+}

src/test/java/some/custom/pkg1/CustomInterceptorBean.java

@@ -0,0 +1,31 @@
+package some.custom.pkg1;
+
+import org.hl7.fhir.instance.model.api.IBaseResource;
+import org.hl7.fhir.r4.model.Extension;
+import org.hl7.fhir.r4.model.Patient;
+import org.hl7.fhir.r4.model.StringType;
+import org.springframework.stereotype.Component;
+
+import ca.uhn.fhir.interceptor.api.Hook;
+import ca.uhn.fhir.interceptor.api.Interceptor;
+import ca.uhn.fhir.interceptor.api.Pointcut;
+import ca.uhn.fhir.rest.api.RestOperationTypeEnum;
+import ca.uhn.fhir.rest.server.servlet.ServletRequestDetails;
+
+@Interceptor
+@Component
+public class CustomInterceptorBean {
+
+	@Hook(Pointcut.SERVER_INCOMING_REQUEST_PRE_HANDLED)
+	void preHandleResource(ServletRequestDetails servletRequestDetails, RestOperationTypeEnum opType) {
+		IBaseResource resource = servletRequestDetails.getResource();
+
+		// add an extension before saving the resource to mark it
+		if (opType == RestOperationTypeEnum.CREATE && resource instanceof Patient) {
+			Patient pat = (Patient) resource;
+			Extension ext = pat.addExtension();
+			ext.setUrl("http://some.custom.pkg1/CustomInterceptorBean");
+			ext.setValue(new StringType("CustomInterceptorBean wuz here"));
+		}
+	}
+}

src/test/java/some/custom/pkg1/CustomInterceptorPojo.java

@@ -0,0 +1,26 @@
+package some.custom.pkg1;
+
+import org.hl7.fhir.instance.model.api.IBaseResource;
+import org.hl7.fhir.r4.model.Extension;
+import org.hl7.fhir.r4.model.Patient;
+import org.hl7.fhir.r4.model.StringType;
+import ca.uhn.fhir.interceptor.api.Hook;
+import ca.uhn.fhir.interceptor.api.Pointcut;
+import ca.uhn.fhir.rest.api.RestOperationTypeEnum;
+import ca.uhn.fhir.rest.server.servlet.ServletRequestDetails;
+
+public class CustomInterceptorPojo {
+
+	@Hook(Pointcut.SERVER_INCOMING_REQUEST_PRE_HANDLED)
+	void preHandleResource(ServletRequestDetails servletRequestDetails, RestOperationTypeEnum opType) {
+		IBaseResource resource = servletRequestDetails.getResource();
+
+		// add an extension before saving the resource to mark it
+		if (opType == RestOperationTypeEnum.CREATE && resource instanceof Patient) {
+			Patient pat = (Patient) resource;
+			Extension ext = pat.addExtension();
+			ext.setUrl("http://some.custom.pkg1/CustomInterceptorPojo");
+			ext.setValue(new StringType("CustomInterceptorPojo wuz here"));
+		}
+	}
+}