Add graphql and _filter support

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

@@ -111,6 +111,8 @@ public class FhirServerConfigCommon {
             retVal.addSupportedSubscriptionType(Subscription.SubscriptionChannelType.WEBSOCKET);
         }
 
+        retVal.setFilterParameterEnabled(HapiProperties.getFilterSearchEnabled());
+
         return retVal;
     }
 

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

@@ -6,8 +6,8 @@ import ca.uhn.fhir.rest.api.EncodingEnum;
 import ca.uhn.fhir.rest.server.ETagSupportEnum;
 import com.google.common.annotations.VisibleForTesting;
 
-import java.io.InputStream;
 import java.io.FileInputStream;
+import java.io.InputStream;
 import java.util.Arrays;
 import java.util.Properties;
 import java.util.Set;
@@ -16,6 +16,7 @@ import java.util.stream.Collectors;
 import static org.apache.commons.lang3.StringUtils.*;
 
 public class HapiProperties {
+    public static final String BINARY_STORAGE_ENABLED = "binary_storage.enabled";
     static final String ALLOW_EXTERNAL_REFERENCES = "allow_external_references";
     static final String ALLOW_MULTIPLE_DELETE = "allow_multiple_delete";
     static final String ALLOW_PLACEHOLDER_REFERENCES = "allow_placeholder_references";
@@ -51,10 +52,10 @@ public class HapiProperties {
     static final String ALLOW_CONTAINS_SEARCHES = "allow_contains_searches";
     static final String ALLOW_OVERRIDE_DEFAULT_SEARCH_PARAMS = "allow_override_default_search_params";
     static final String EMAIL_FROM = "email.from";
-    public static final String BINARY_STORAGE_ENABLED = "binary_storage.enabled";
     private static final String VALIDATE_REQUESTS_ENABLED = "validation.requests.enabled";
     private static final String VALIDATE_RESPONSES_ENABLED = "validation.responses.enabled";
-
+    private static final String FILTER_SEARCH_ENABLED = "filter_search.enabled";
+    private static final String GRAPHQL_ENABLED = "graphql.enabled";
     private static Properties properties;
 
     /*
@@ -96,6 +97,7 @@ public class HapiProperties {
     /**
      * If a configuration file path is explicitly specified via -Dhapi.properties=<path>, the properties there will
      * be used to override the entries in the default hapi.properties file (currently under WEB-INF/classes)
+     *
      * @return properties loaded from the explicitly specified configuraiton file if there is one, or null otherwise.
      */
     private static Properties loadOverrideProperties() {
@@ -105,8 +107,7 @@ public class HapiProperties {
                 Properties props = new Properties();
                 props.load(new FileInputStream(confFile));
                 return props;
-            }
-            catch (Exception e) {
+            } catch (Exception e) {
                 throw new ConfigurationException("Could not load HAPI properties file: " + confFile, e);
             }
         }
@@ -358,7 +359,16 @@ public class HapiProperties {
     }
 
     public static boolean getValidateResponsesEnabled() {
-        return HapiProperties.getBooleanProperty(VALIDATE_REQUESTS_ENABLED, false);
+        return HapiProperties.getBooleanProperty(VALIDATE_RESPONSES_ENABLED, false);
+    }
+
+    public static boolean getFilterSearchEnabled() {
+        return HapiProperties.getBooleanProperty(FILTER_SEARCH_ENABLED, true);
+    }
+
+    public static boolean getGraphqlEnabled() {
+        return HapiProperties.getBooleanProperty(GRAPHQL_ENABLED, true);
     }
 
 }
+

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

@@ -9,10 +9,7 @@ import ca.uhn.fhir.jpa.dao.DaoConfig;
 import ca.uhn.fhir.jpa.dao.DaoRegistry;
 import ca.uhn.fhir.jpa.dao.IFhirSystemDao;
 import ca.uhn.fhir.jpa.interceptor.CascadingDeleteInterceptor;
-import ca.uhn.fhir.jpa.provider.JpaConformanceProviderDstu2;
-import ca.uhn.fhir.jpa.provider.JpaSystemProviderDstu2;
-import ca.uhn.fhir.jpa.provider.SubscriptionTriggeringProvider;
-import ca.uhn.fhir.jpa.provider.TerminologyUploaderProvider;
+import ca.uhn.fhir.jpa.provider.*;
 import ca.uhn.fhir.jpa.provider.dstu3.JpaConformanceProviderDstu3;
 import ca.uhn.fhir.jpa.provider.dstu3.JpaSystemProviderDstu3;
 import ca.uhn.fhir.jpa.provider.r4.JpaConformanceProviderR4;
@@ -54,7 +51,6 @@ public class JpaRestfulServer extends RestfulServer {
          * specified in the properties file.
          */
         ApplicationContext appCtx = (ApplicationContext) getServletContext().getAttribute("org.springframework.web.context.WebApplicationContext.ROOT");
-
         // Customize supported resource types
         Set<String> supportedResourceTypes = HapiProperties.getSupportedResourceTypes();
         if (!supportedResourceTypes.isEmpty()) {
@@ -281,6 +277,13 @@ public class JpaRestfulServer extends RestfulServer {
             }
         }
 
+        // GraphQL
+        if (HapiProperties.getGraphqlEnabled()) {
+            if (fhirVersion.isEqualOrNewerThan(FhirVersionEnum.DSTU3)) {
+                registerProvider(appCtx.getBean(GraphQLProvider.class));
+            }
+        }
+
     }
 
 }

src/main/resources/hapi.properties

@@ -47,6 +47,11 @@ validation.requests.enabled=false
 # Should outgoing responses be validated
 validation.responses.enabled=false
 
+###################################################
+# Search Features
+###################################################
+filter_search.enabled=true
+graphql.enabled=true
 
 ###################################################
 # Supported Resources