Updated CORS filter to explicitly allow all filters (#16)

* Updated CORS filter to explicitly allow all filters

Signed-off-by: Martin Lowe <martin.lowe@eclipse-foundation.org>

* Add explicit CORS header filter (baked in not working as intended)

Signed-off-by: Martin Lowe <martin.lowe@eclipse-foundation.org>

src/main/java/org/eclipsefoundation/adopters/response/CORSFilter.java

+/**
+ * ***************************************************************************** Copyright (C) 2020
+ * Eclipse Foundation
+ *
+ * <p>This program and the accompanying materials are made available under the terms of the Eclipse
+ * Public License 2.0 which is available at https://www.eclipse.org/legal/epl-2.0/
+ *
+ * <p>SPDX-License-Identifier: EPL-2.0
+ * ****************************************************************************
+ */
+package org.eclipsefoundation.adopters.response;
+
+import java.io.IOException;
+import java.util.Arrays;
+
+import javax.ws.rs.container.ContainerRequestContext;
+import javax.ws.rs.container.ContainerResponseContext;
+import javax.ws.rs.container.ContainerResponseFilter;
+import javax.ws.rs.ext.Provider;
+
+import org.eclipse.microprofile.config.inject.ConfigProperty;
+
+@Provider
+public class CORSFilter implements ContainerResponseFilter {
+  @ConfigProperty(name = "quarkus.http.cors.exposed-headers")
+  String exposedHeaders;
+
+  @Override
+  public void filter(
+      ContainerRequestContext requestContext, ContainerResponseContext responseContext)
+      throws IOException {
+    responseContext.getHeaders().put("Access-Control-Expose-Headers", Arrays.asList(exposedHeaders));
+  }
+}

src/main/resources/application.properties

@@ -4,6 +4,10 @@ org.eclipsefoundation.adopters.api.ProjectsAPI/mp-rest/url=https://projects.ecli
 quarkus.http.port=8080
 quarkus.http.root-path=/adopters
 
+## CORS settings
+quarkus.http.cors=true
+quarkus.http.cors.exposed-headers=Etag,Link,Content-Type
+
 ## Adopters raw location
 eclipse.adopters.path.json=/config/adopters.json
 %dev.eclipse.adopters.path.json=/tmp/config/adopters.json
\ No newline at end of file