Add interceptor hook for graphql calls

hapi-fhir-base/src/main/java/ca/uhn/fhir/context/FhirContext.java

@@ -631,7 +631,10 @@ public class FhirContext {
 	 * Performance Note: <b>This method is cheap</b> to call, and may be called once for every message being processed
 	 * without incurring any performance penalty
 	 * </p>
+	 *
+	 * @deprecated THIS FEATURE IS NOT YET COMPLETE
 	 */
+	@Deprecated
 	public IParser newRDFParser() {
 		return new RDFParser(this, myParserErrorHandler, Lang.TURTLE);
 	}

hapi-fhir-base/src/main/java/ca/uhn/fhir/interceptor/api/Pointcut.java

@@ -374,6 +374,57 @@ public enum Pointcut {
 	),
 
 
+
+	/**
+	 * <b>Server Hook:</b>
+	 * This method is called after the server implementation method has been called, but before any attempt
+	 * to stream the response back to the client, specifically for GraphQL requests (as these do not fit
+	 * cleanly into the model provided by {@link #SERVER_OUTGOING_RESPONSE}).
+	 * <p>
+	 * Hooks may accept the following parameters:
+	 * <ul>
+	 * <li>
+	 * ca.uhn.fhir.rest.api.server.RequestDetails - A bean containing details about the request that is about to be processed, including details such as the
+	 * resource type and logical ID (if any) and other FHIR-specific aspects of the request which have been
+	 * pulled out of the servlet request.
+	 * </li>
+	 * <li>
+	 * ca.uhn.fhir.rest.server.servlet.ServletRequestDetails - A bean containing details about the request that is about to be processed, including details such as the
+	 * resource type and logical ID (if any) and other FHIR-specific aspects of the request which have been
+	 * pulled out of the servlet request. This parameter is identical to the RequestDetails parameter above but will
+	 * only be populated when operating in a RestfulServer implementation. It is provided as a convenience.
+	 * </li>
+	 * <li>
+	 * java.lang.String - The GraphQL query
+	 * </li>
+	 * <li>
+	 * java.lang.String - The GraphQL response
+	 * </li>
+	 * <li>
+	 * ca.uhn.fhir.rest.api.server.ResponseDetails - This object contains details about the response, including the contents. Hook methods may modify this object to change or replace the response.
+	 * </li>
+	 * </ul>
+	 * </p>
+	 * <p>
+	 * Hook methods may return <code>true</code> or <code>void</code> if processing should continue normally.
+	 * This is generally the right thing to do. If your interceptor is providing a response rather than
+	 * letting HAPI handle the response normally, you must return <code>false</code>. In this case,
+	 * no further processing will occur and no further interceptors will be called.
+	 * </p>
+	 * <p>
+	 * Hook methods may also throw {@link AuthenticationException} to indicate that the interceptor
+	 * has detected an unauthorized access attempt. If thrown, processing will stop and an HTTP 401
+	 * will be returned to the client.
+	 */
+	SERVER_OUTGOING_GRAPHQL_RESPONSE(boolean.class,
+		"ca.uhn.fhir.rest.api.server.RequestDetails",
+		"ca.uhn.fhir.rest.server.servlet.ServletRequestDetails",
+		"java.lang.String",
+		"java.lang.String",
+		"ca.uhn.fhir.rest.api.server.ResponseDetails"
+	),
+
+
 	/**
 	 * <b>Server Hook:</b>
 	 * This method is called when an OperationOutcome is being returned in response to a failure.

hapi-fhir-base/src/main/java/ca/uhn/fhir/rest/api/Constants.java

@@ -219,6 +219,7 @@ public class Constants {
 	public static final int MAX_RESOURCE_NAME_LENGTH = 100;
 	public static final String CACHE_CONTROL_PRIVATE = "private";
 	public static final int STATUS_HTTP_412_PAYLOAD_TOO_LARGE = 413;
+	public static final String OPERATION_NAME_GRAPHQL = "$graphql";
 
 	static {
 		CHARSET_UTF8 = Charset.forName(CHARSET_NAME_UTF8);

hapi-fhir-base/src/main/java/ca/uhn/fhir/rest/api/EncodingEnum.java

@@ -49,7 +49,9 @@ public enum EncodingEnum {
 		public IParser newParser(FhirContext theContext) {
 			return theContext.newRDFParser();
 		}
-	};
+	},
+
+	;
 
 	/**
 	 * "json"

hapi-fhir-jpaserver-base/src/main/java/ca/uhn/fhir/jpa/provider/GraphQLProvider.java

@@ -109,7 +109,7 @@ public class GraphQLProvider {
 	}
 
 	@GraphQL
-	public String processGraphQlRequet(ServletRequestDetails theRequestDetails, @IdParam IIdType theId, @GraphQLQuery String theQuery) {
+	public String processGraphQlRequest(ServletRequestDetails theRequestDetails, @IdParam IIdType theId, @GraphQLQuery String theQuery) {
 
 		IGraphQLEngine engine = engineFactory.get();
 		engine.setAppInfo(theRequestDetails);

hapi-fhir-server/src/main/java/ca/uhn/fhir/rest/server/method/GraphQLMethodBinding.java

@@ -21,16 +21,19 @@ package ca.uhn.fhir.rest.server.method;
  */
 
 import ca.uhn.fhir.context.FhirContext;
+import ca.uhn.fhir.interceptor.api.HookParams;
+import ca.uhn.fhir.interceptor.api.Pointcut;
 import ca.uhn.fhir.rest.api.Constants;
 import ca.uhn.fhir.rest.api.RestOperationTypeEnum;
 import ca.uhn.fhir.rest.api.server.IRestfulServer;
 import ca.uhn.fhir.rest.api.server.RequestDetails;
 import ca.uhn.fhir.rest.param.ParameterUtil;
-import ca.uhn.fhir.rest.server.RestfulServer;
-import ca.uhn.fhir.rest.server.RestfulServerUtils;
 import ca.uhn.fhir.rest.server.exceptions.BaseServerResponseException;
+import ca.uhn.fhir.rest.server.servlet.ServletRequestDetails;
 
 import javax.annotation.Nonnull;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
 import java.io.IOException;
 import java.io.Writer;
 import java.lang.reflect.Method;
@@ -63,7 +66,7 @@ public class GraphQLMethodBinding extends BaseMethodBinding<String> {
 
 	@Override
 	public boolean incomingServerRequestMatchesMethod(RequestDetails theRequest) {
-		if ("$graphql".equals(theRequest.getOperation())) {
+		if (Constants.OPERATION_NAME_GRAPHQL.equals(theRequest.getOperation())) {
 			return true;
 		}
 
@@ -85,11 +88,22 @@ public class GraphQLMethodBinding extends BaseMethodBinding<String> {
 		String charset = Constants.CHARSET_NAME_UTF8;
 		boolean respondGzip = theRequest.isRespondGzip();
 
-		Writer writer = theRequest.getResponse().getResponseWriter(statusCode, statusMessage, contentType, charset, respondGzip);
-
 		String responseString = (String) response;
-		writer.write(responseString);
-		writer.close();
+
+		// Interceptor call: SERVER_OUTGOING_GRAPHQL_RESPONSE
+		HookParams params = new HookParams()
+			.add(RequestDetails.class, theRequest)
+			.addIfMatchesType(ServletRequestDetails.class, theRequest)
+			.add(String.class, theRequest.getParameters().get(Constants.PARAM_GRAPHQL_QUERY)[0])
+			.add(String.class, responseString);
+		if (theRequest.getInterceptorBroadcaster().callHooks(Pointcut.SERVER_OUTGOING_GRAPHQL_RESPONSE, params)) {
+
+			// Write the response
+			Writer writer = theRequest.getResponse().getResponseWriter(statusCode, statusMessage, contentType, charset, respondGzip);
+			writer.write(responseString);
+			writer.close();
+
+		}
 
 		return null;
 	}

src/changes/changes.xml

@@ -6,6 +6,15 @@
 		<title>HAPI FHIR Changelog</title>
 	</properties>
 	<body>
+		<!--
+		<release version="4.1.0" date="TBD" description="Igloo">
+		<action type="add" issue="1321">
+			Support has been added for RDF encoding and parsing in the
+			<![CDATA[<a href="https://www.hl7.org/fhir/rdf.html#instance">Turtle</a>]]>
+			format. Thanks to Raul Estrada for the pull request!
+		</action>
+		</release>
+		-->
 		<release version="4.0.0" date="TBD" description="Igloo">
 			<action type="add">
 				The version of a few dependencies have been bumped to the
@@ -135,11 +144,6 @@
 				</li>The rule list is now cached on a per-request basis, which should improve performance</ul>
 				]]>
 			</action>
-			<action type="add" issue="1321">
-				Support has been added for RDF encoding and parsing in the
-				<![CDATA[<a href="https://www.hl7.org/fhir/rdf.html#instance">Turtle</a>]]>
-				format. Thanks to Raul Estrada for the pull request!
-			</action>
 			<action type="add">
 				The $expunge global everything operation has been refactored to do deletes
 				in small batches. This change will likely reduce performance, but does allow