Add swagger generation for jaxrs api

Issue-ID: CLAMP-137

Change-Id: I0b1e088a99a7e1c63dc0b0f4a36b16020181bf1f
Signed-off-by: Bertozzi, Julien (jb379x) <jb379x@att.com>

3 files changed, 63 insertions, 0 deletions

diff --git a/README.md b/README.md
index 4fe12ff2..ea061ce3 100644
--- a/README.md
+++ b/README.md
@@ -88,3 +88,7 @@ Once the image has been built and is available locally, you can use the `docker-
 Clamp uses logback framework to generate logs. The logback.xml file cand be found under the [src/main/resources/ folder](src/main/resources). 

 

 With the default log settings, all logs will be generated into console and into root.log file under the Clamp root folder. The root.log file is not allowed to be appended, thus restarting the clamp will result in cleaning of the old log files.

+

+### Api

+

+You can see the swagger definition for the jaxrs apis at `/restservices/clds/v1/openapi.json`
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diff --git a/pom.xml b/pom.xml
index 2f1a7d24..9591e7f9 100644
--- a/pom.xml
+++ b/pom.xml
@@ -70,6 +70,8 @@
 				<project.scm.id>git-server</project.scm.id>
 				<java.version>1.8</java.version>
 
+				<swagger.jaxrs2.version>2.0.0-rc4</swagger.jaxrs2.version>
+				<guava.version>20.0</guava.version>
 				<eelf.core.version>1.0.0</eelf.core.version>
 				<camel.version>2.20.1</camel.version>
 				<springboot.version>1.5.10.RELEASE</springboot.version>
@@ -168,6 +170,17 @@
 		</dependencyManagement>
 
 		<dependencies>
+				<!-- Swagger requires at least v20 and policy is bringing version 14 -->
+				<dependency>
+					<groupId>com.google.guava</groupId>
+					<artifactId>guava</artifactId>
+					<version>${guava.version}</version>
+				</dependency>
+				<dependency>
+					<groupId>io.swagger.core.v3</groupId>
+					<artifactId>swagger-jaxrs2</artifactId>
+					<version>${swagger.jaxrs2.version}</version>
+				</dependency>
 				<dependency>
 						<groupId>com.att.eelf</groupId>
 						<artifactId>eelf-core</artifactId>
@@ -304,6 +317,10 @@
 						<version>1.1.0</version>
 						<exclusions>
 								<exclusion>
+										<groupId>com.google.guava</groupId>
+										<artifactId>guava</artifactId>
+								</exclusion>
+								<exclusion>
 										<artifactId>log4j</artifactId>
 										<groupId>log4j</groupId>
 								</exclusion>
diff --git a/src/main/java/org/onap/clamp/clds/service/JaxrsApplication.java b/src/main/java/org/onap/clamp/clds/service/JaxrsApplication.java
index d6e74aef..702e0649 100644
--- a/src/main/java/org/onap/clamp/clds/service/JaxrsApplication.java
+++ b/src/main/java/org/onap/clamp/clds/service/JaxrsApplication.java
@@ -23,12 +23,54 @@
 
 package org.onap.clamp.clds.service;
 
+import com.att.eelf.configuration.EELFLogger;
+import com.att.eelf.configuration.EELFManager;
+
+import java.util.HashSet;
+import java.util.List;
+import java.util.Optional;
+import java.util.Set;
+import java.util.function.Function;
+import java.util.stream.Collectors;
 import javax.ws.rs.ApplicationPath;
 import javax.ws.rs.core.Application;
 
+import org.springframework.beans.factory.config.BeanDefinition;
+import org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider;
+import org.springframework.core.type.filter.AnnotationTypeFilter;
 import org.springframework.stereotype.Component;
 
 @Component
 @ApplicationPath("/restservices/clds/v1")
 public class JaxrsApplication extends Application {
+
+    private static final EELFLogger logger = EELFManager.getInstance().getLogger(JaxrsApplication.class);
+
+    private Function<BeanDefinition, Optional<Class<?>>> beanDefinitionToClass = b -> {
+        try {
+            return Optional.of(Class.forName(b.getBeanClassName()));
+        } catch (ClassNotFoundException e) {
+            logger.error("Could not get class annotated with @Path for swagger documentation generation", e);
+            return Optional.empty();
+        }
+    };
+
+    @Override
+    public Set<Class<?>> getClasses() {
+        Set<Class<?>> resources = new HashSet<>();
+        resources.add(io.swagger.v3.jaxrs2.integration.resources.OpenApiResource.class);
+        resources.addAll(scan());
+        return resources;
+    }
+
+    private List<Class<?>> scan() {
+        ClassPathScanningCandidateComponentProvider scanner = new ClassPathScanningCandidateComponentProvider(false);
+        scanner.addIncludeFilter(new AnnotationTypeFilter(javax.ws.rs.Path.class));
+        return scanner.findCandidateComponents("org.onap.clamp.clds").stream()
+                .map(beanDefinitionToClass)
+                .filter(Optional::isPresent)
+                .map(Optional::get)
+                .collect(Collectors.toList());
+    }
+
 }
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