feat(operator): Add support for properly configuring the CORS allowed origins header

operator/controller/src/main/java/io/apicurio/registry/operator/EnvironmentVariables.java

@@ -10,4 +10,6 @@ public class EnvironmentVariables {
     public static final String APICURIO_REST_DELETION_ARTIFACT_ENABLED = "APICURIO_REST_DELETION_ARTIFACT_ENABLED";
     public static final String APICURIO_REST_DELETION_GROUP_ENABLED = "APICURIO_REST_DELETION_GROUP_ENABLED";
 
+    public static final String APICURIO_REST_MUTABILITY_ARTIFACT_VERSION_CONTENT_ENABLED = "APICURIO_REST_MUTABILITY_ARTIFACT-VERSION-CONTENT_ENABLED";
+
 }

operator/controller/src/main/java/io/apicurio/registry/operator/feat/Cors.java

@@ -0,0 +1,73 @@
+package io.apicurio.registry.operator.feat;
+
+import io.apicurio.registry.operator.EnvironmentVariables;
+import io.apicurio.registry.operator.api.v1.ApicurioRegistry3;
+import io.apicurio.registry.operator.api.v1.ApicurioRegistry3Spec;
+import io.apicurio.registry.operator.api.v1.spec.ComponentSpec;
+import io.apicurio.registry.operator.resource.ResourceFactory;
+import io.apicurio.registry.operator.utils.IngressUtils;
+import io.fabric8.kubernetes.api.model.EnvVar;
+import io.fabric8.kubernetes.api.model.EnvVarBuilder;
+
+import java.util.Arrays;
+import java.util.LinkedHashMap;
+import java.util.Optional;
+import java.util.Set;
+import java.util.TreeSet;
+
+/**
+ * Helper class used to handle CORS related configuration.
+ */
+public class Cors {
+    /**
+     * Configure the QUARKUS_HTTP_CORS_ORIGINS environment variable with the following:
+     * <ul>
+     * <li>Add the ingress host</li>
+     * <li>Override if QUARKUS_HTTP_CORS_ORIGINS is configured in the "env" section</li>
+     * </ul>
+     * 
+     * @param primary
+     * @param envVars
+     */
+    public static void configureAllowedOrigins(ApicurioRegistry3 primary,
+            LinkedHashMap<String, EnvVar> envVars) {
+        TreeSet<String> allowedOrigins = new TreeSet<>();
+
+        // If the QUARKUS_HTTP_CORS_ORIGINS env var is configured in the "env" section of the CR,
+        // then make sure to add those configured values to the set of allowed origins we want to
+        // configure.
+        Optional.ofNullable(primary.getSpec()).map(ApicurioRegistry3Spec::getApp).map(ComponentSpec::getEnv)
+                .ifPresent(env -> {
+                    env.stream().filter(
+                            envVar -> envVar.getName().equals(EnvironmentVariables.QUARKUS_HTTP_CORS_ORIGINS))
+                            .forEach(envVar -> {
+                                Optional.ofNullable(envVar.getValue()).ifPresent(envVarValue -> {
+                                    Arrays.stream(envVarValue.split(",")).forEach(allowedOrigins::add);
+                                });
+                            });
+                });
+
+        // If not, let's try to figure it out from other sources.
+        if (allowedOrigins.isEmpty()) {
+            // If there is a configured Ingress host for the UI or the Studio UI, add them to the allowed
+            // origins.
+            Set.of(ResourceFactory.COMPONENT_UI, ResourceFactory.COMPONENT_STUDIO_UI).forEach(component -> {
+                String host = IngressUtils.getConfiguredHost(component, primary);
+                if (host != null) {
+                    allowedOrigins.add("http://" + host);
+                    allowedOrigins.add("https://" + host);
+                }
+            });
+        }
+
+        // If we still do not have anything, then default to "*"
+        if (allowedOrigins.isEmpty()) {
+            allowedOrigins.add("*");
+        }
+
+        // Join the values in allowedOrigins into a String and set it as the new value of the env var.
+        String envVarValue = String.join(",", allowedOrigins);
+        envVars.put(EnvironmentVariables.QUARKUS_HTTP_CORS_ORIGINS, new EnvVarBuilder()
+                .withName(EnvironmentVariables.QUARKUS_HTTP_CORS_ORIGINS).withValue(envVarValue).build());
+    }
+}

operator/controller/src/main/java/io/apicurio/registry/operator/resource/ResourceFactory.java

@@ -274,8 +274,20 @@ public static <T> T deserialize(String path, Class<T> klass) {
         }
     }
 
+    public static <T> T deserialize(String path, Class<T> klass, ClassLoader classLoader) {
+        try {
+            return YAML_MAPPER.readValue(load(path, classLoader), klass);
+        } catch (JsonProcessingException ex) {
+            throw new OperatorException("Could not deserialize resource: " + path, ex);
+        }
+    }
+
     public static String load(String path) {
-        try (var stream = Thread.currentThread().getContextClassLoader().getResourceAsStream(path)) {
+        return load(path, Thread.currentThread().getContextClassLoader());
+    }
+
+    public static String load(String path, ClassLoader classLoader) {
+        try (var stream = classLoader.getResourceAsStream(path)) {
             return new String(stream.readAllBytes(), Charset.defaultCharset());
         } catch (Exception ex) {
             throw new OperatorException("Could not read resource: " + path, ex);

operator/controller/src/main/java/io/apicurio/registry/operator/resource/app/AppDeploymentResource.java

@@ -7,6 +7,7 @@
 import io.apicurio.registry.operator.api.v1.spec.AppFeaturesSpec;
 import io.apicurio.registry.operator.api.v1.spec.AppSpec;
 import io.apicurio.registry.operator.api.v1.spec.StorageSpec;
+import io.apicurio.registry.operator.feat.Cors;
 import io.apicurio.registry.operator.feat.KafkaSql;
 import io.apicurio.registry.operator.feat.PostgresSql;
 import io.fabric8.kubernetes.api.model.Container;
@@ -60,7 +61,6 @@ protected Deployment desired(ApicurioRegistry3 primary, Context<ApicurioRegistry
         // spotless:off
         addEnvVar(envVars, new EnvVarBuilder().withName(EnvironmentVariables.QUARKUS_PROFILE).withValue("prod").build());
         addEnvVar(envVars, new EnvVarBuilder().withName(EnvironmentVariables.QUARKUS_HTTP_ACCESS_LOG_ENABLED).withValue("true").build());
-        addEnvVar(envVars, new EnvVarBuilder().withName(EnvironmentVariables.QUARKUS_HTTP_CORS_ORIGINS).withValue("*").build());
 
         // Enable deletes if configured in the CR
         boolean allowDeletes = Optional.ofNullable(primary.getSpec().getApp())
@@ -72,18 +72,23 @@ protected Deployment desired(ApicurioRegistry3 primary, Context<ApicurioRegistry
             addEnvVar(envVars, new EnvVarBuilder().withName(EnvironmentVariables.APICURIO_REST_DELETION_ARTIFACT_ENABLED).withValue("true").build());
             addEnvVar(envVars, new EnvVarBuilder().withName(EnvironmentVariables.APICURIO_REST_DELETION_GROUP_ENABLED).withValue("true").build());
         }
-        // spotless:on
 
-        // This is enabled only if Studio is deployed. It is based on Service in case a custom Ingress is
-        // used.
+        // Configure the CORS_ALLOWED_ORIGINS env var based on the ingress host
+        Cors.configureAllowedOrigins(primary, envVars);
+
+        // Enable the "mutability" feature in Registry, but only if Studio is deployed. It is based on Service
+        // in case a custom Ingress is used.
         var sOpt = context.getSecondaryResource(STUDIO_UI_SERVICE_KEY.getKlass(),
                 STUDIO_UI_SERVICE_KEY.getDiscriminator());
         sOpt.ifPresent(s -> {
             addEnvVar(envVars,
-                    new EnvVarBuilder().withName("APICURIO_REST_MUTABILITY_ARTIFACT-VERSION-CONTENT_ENABLED")
+                    new EnvVarBuilder().withName(EnvironmentVariables.APICURIO_REST_MUTABILITY_ARTIFACT_VERSION_CONTENT_ENABLED)
                             .withValue("true").build());
         });
 
+        // spotless:on
+
+        // Configure the storage (Postgresql or KafkaSql).
         ofNullable(primary.getSpec()).map(ApicurioRegistry3Spec::getApp).map(AppSpec::getStorage)
                 .map(StorageSpec::getType).ifPresent(storageType -> {
                     switch (storageType) {
@@ -92,6 +97,7 @@ protected Deployment desired(ApicurioRegistry3 primary, Context<ApicurioRegistry
                     }
                 });
 
+        // Set the ENV VARs on the deployment's container spec.
         var container = getContainerFromDeployment(d, REGISTRY_APP_CONTAINER_NAME);
         container.setEnv(envVars.values().stream().toList());
 

operator/controller/src/main/java/io/apicurio/registry/operator/utils/IngressUtils.java

@@ -28,21 +28,39 @@ public final class IngressUtils {
     private IngressUtils() {
     }
 
-    public static String getHost(String component, ApicurioRegistry3 p) {
+    /**
+     * Get the host configured in the ingress. If no host is configured in the ingress then a null is
+     * returned.
+     * 
+     * @param component
+     * @param primary
+     */
+    public static String getConfiguredHost(String component, ApicurioRegistry3 primary) {
         String host = switch (component) {
-            case COMPONENT_APP -> ofNullable(p.getSpec()).map(ApicurioRegistry3Spec::getApp)
+            case COMPONENT_APP -> ofNullable(primary.getSpec()).map(ApicurioRegistry3Spec::getApp)
                     .map(AppSpec::getIngress).map(IngressSpec::getHost).filter(h -> !isBlank(h)).orElse(null);
-            case COMPONENT_UI -> ofNullable(p.getSpec()).map(ApicurioRegistry3Spec::getUi)
+            case COMPONENT_UI -> ofNullable(primary.getSpec()).map(ApicurioRegistry3Spec::getUi)
                     .map(UiSpec::getIngress).map(IngressSpec::getHost).filter(h -> !isBlank(h)).orElse(null);
-            case COMPONENT_STUDIO_UI ->
-                ofNullable(p.getSpec()).map(ApicurioRegistry3Spec::getStudioUi).map(StudioUiSpec::getIngress)
-                        .map(IngressSpec::getHost).filter(h -> !isBlank(h)).orElse(null);
+            case COMPONENT_STUDIO_UI -> ofNullable(primary.getSpec()).map(ApicurioRegistry3Spec::getStudioUi)
+                    .map(StudioUiSpec::getIngress).map(IngressSpec::getHost).filter(h -> !isBlank(h))
+                    .orElse(null);
             default -> throw new OperatorException("Unexpected value: " + component);
         };
+        return host;
+    }
+
+    /**
+     * Get the host for an ingress. If not configured, a default value is returned.
+     * 
+     * @param component
+     * @param primary
+     */
+    public static String getHost(String component, ApicurioRegistry3 primary) {
+        String host = getConfiguredHost(component, primary);
         if (host == null) {
             // TODO: This is not used because of the current activation conditions.
-            host = "%s-%s.%s%s".formatted(p.getMetadata().getName(), component,
-                    p.getMetadata().getNamespace(), Configuration.getDefaultBaseHost());
+            host = "%s-%s.%s%s".formatted(primary.getMetadata().getName(), component,
+                    primary.getMetadata().getNamespace(), Configuration.getDefaultBaseHost());
         }
         log.debug("Host for component {} is {}", component, host);
         return host;

operator/controller/src/test/java/io/apicurio/registry/operator/it/AppFeaturesITTest.java

@@ -7,8 +7,6 @@
 import io.fabric8.kubernetes.api.model.EnvVar;
 import io.quarkus.test.junit.QuarkusTest;
 import org.junit.jupiter.api.Test;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 import static io.apicurio.registry.operator.api.v1.ContainerNames.REGISTRY_APP_CONTAINER_NAME;
 import static io.apicurio.registry.operator.resource.app.AppDeploymentResource.getContainerFromDeployment;
@@ -17,8 +15,6 @@
 @QuarkusTest
 public class AppFeaturesITTest extends ITBase {
 
-    private static final Logger log = LoggerFactory.getLogger(AppFeaturesITTest.class);
-
     @Test
     void testAllowDeletesTrue() {
         ApicurioRegistry3 registry = ResourceFactory

operator/controller/src/test/java/io/apicurio/registry/operator/it/SmokeITTest.java

@@ -1,5 +1,6 @@
 package io.apicurio.registry.operator.it;
 
+import io.apicurio.registry.operator.EnvironmentVariables;
 import io.apicurio.registry.operator.api.v1.ApicurioRegistry3;
 import io.apicurio.registry.operator.resource.ResourceFactory;
 import io.fabric8.kubernetes.api.model.Container;
@@ -15,9 +16,11 @@
 
 import java.net.URI;
 
+import static io.apicurio.registry.operator.api.v1.ContainerNames.REGISTRY_APP_CONTAINER_NAME;
 import static io.apicurio.registry.operator.api.v1.ContainerNames.REGISTRY_UI_CONTAINER_NAME;
 import static io.apicurio.registry.operator.resource.ResourceFactory.COMPONENT_APP;
 import static io.apicurio.registry.operator.resource.ResourceFactory.COMPONENT_UI;
+import static io.apicurio.registry.operator.resource.app.AppDeploymentResource.getContainerFromDeployment;
 import static io.restassured.RestAssured.given;
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.awaitility.Awaitility.await;
@@ -70,6 +73,18 @@ void smoke() {
                     .get(0).getHost()).isEqualTo(registry.getSpec().getUi().getIngress().getHost());
             return true;
         });
+
+        // Check CORS allowed origins is set on the app, with the value based on the UI ingress host
+        String uiIngressHost = client.network().v1().ingresses().inNamespace(namespace)
+                .withName(registry.getMetadata().getName() + "-ui-ingress").get().getSpec().getRules().get(0)
+                .getHost();
+        String corsOriginsExpectedValue = "http://" + uiIngressHost + "," + "https://" + uiIngressHost;
+        var appEnv = getContainerFromDeployment(
+                client.apps().deployments().inNamespace(namespace)
+                        .withName(registry.getMetadata().getName() + "-app-deployment").get(),
+                REGISTRY_APP_CONTAINER_NAME).getEnv();
+        assertThat(appEnv).map(ev -> ev.getName() + "=" + ev.getValue())
+                .contains(EnvironmentVariables.QUARKUS_HTTP_CORS_ORIGINS + "=" + corsOriginsExpectedValue);
     }
 
     @Test

operator/controller/src/test/java/io/apicurio/registry/operator/unit/CorsTest.java

@@ -0,0 +1,48 @@
+package io.apicurio.registry.operator.unit;
+
+import io.apicurio.registry.operator.EnvironmentVariables;
+import io.apicurio.registry.operator.OperatorException;
+import io.apicurio.registry.operator.api.v1.ApicurioRegistry3;
+import io.apicurio.registry.operator.feat.Cors;
+import io.apicurio.registry.operator.resource.ResourceFactory;
+import io.fabric8.kubernetes.api.model.EnvVar;
+import org.assertj.core.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import java.nio.charset.Charset;
+import java.util.LinkedHashMap;
+import java.util.Set;
+
+public class CorsTest {
+
+    @Test
+    public void testConfigureAllowedOrigins() throws Exception {
+        doTestAllowedOrigins("k8s/examples/cors/example-default.yaml", "*");
+        doTestAllowedOrigins("k8s/examples/cors/example-ingress.yaml",
+                "http://simple-ui.apps.cluster.example", "https://simple-ui.apps.cluster.example");
+        doTestAllowedOrigins("k8s/examples/cors/example-env-vars.yaml", "https://ui.example.org");
+        doTestAllowedOrigins("k8s/examples/cors/example-env-vars-and-ingress.yaml", "https://ui.example.org");
+    }
+
+    private void doTestAllowedOrigins(String crPath, String... values) {
+        ClassLoader classLoader = CorsTest.class.getClassLoader();
+        ApicurioRegistry3 registry = ResourceFactory.deserialize(crPath, ApicurioRegistry3.class,
+                classLoader);
+
+        LinkedHashMap<String, EnvVar> envVars = new LinkedHashMap<>();
+        Cors.configureAllowedOrigins(registry, envVars);
+        Assertions.assertThat(envVars.keySet()).contains(EnvironmentVariables.QUARKUS_HTTP_CORS_ORIGINS);
+        String allowedOriginsValue = envVars.get(EnvironmentVariables.QUARKUS_HTTP_CORS_ORIGINS).getValue();
+        Set<String> allowedOrigins = Set.of(allowedOriginsValue.split(","));
+        Assertions.assertThat(allowedOrigins).containsExactlyInAnyOrder(values);
+    }
+
+    public static String load(String path) {
+        try (var stream = Thread.currentThread().getContextClassLoader().getResourceAsStream(path)) {
+            return new String(stream.readAllBytes(), Charset.defaultCharset());
+        } catch (Exception ex) {
+            throw new OperatorException("Could not read resource: " + path, ex);
+        }
+    }
+
+}

operator/controller/src/test/resources/k8s/examples/cors/example-default.yaml

@@ -0,0 +1,5 @@
+apiVersion: registry.apicur.io/v1
+kind: ApicurioRegistry3
+metadata:
+  name: simple
+spec: {}

operator/controller/src/test/resources/k8s/examples/cors/example-env-vars-and-ingress.yaml

@@ -0,0 +1,14 @@
+apiVersion: registry.apicur.io/v1
+kind: ApicurioRegistry3
+metadata:
+  name: simple
+spec:
+  app:
+    ingress:
+      host: simple-app.apps.cluster.example
+    env:
+      - name: QUARKUS_HTTP_CORS_ORIGINS
+        value: https://ui.example.org
+  ui:
+    ingress:
+      host: simple-ui.apps.cluster.example

operator/controller/src/test/resources/k8s/examples/cors/example-env-vars.yaml

@@ -0,0 +1,9 @@
+apiVersion: registry.apicur.io/v1
+kind: ApicurioRegistry3
+metadata:
+  name: simple
+spec:
+  app:
+    env:
+      - name: QUARKUS_HTTP_CORS_ORIGINS
+        value: https://ui.example.org

operator/controller/src/test/resources/k8s/examples/cors/example-ingress.yaml

@@ -0,0 +1,11 @@
+apiVersion: registry.apicur.io/v1
+kind: ApicurioRegistry3
+metadata:
+  name: simple
+spec:
+  app:
+    ingress:
+      host: simple-app.apps.cluster.example
+  ui:
+    ingress:
+      host: simple-ui.apps.cluster.example