Isolating the usage of json-schema validator to drools-pdp

- only drools-pdp have this validation, so moving the class and
its dependencies to there to avoid loading dependencies where it's
not used.

Issue-ID: POLICY-5084
Change-Id: I782e926aac7576c34401c9fef3cfcd3a98350a7f
Signed-off-by: adheli.tavares <adheli.tavares@est.tech>

3 files changed, 174 insertions, 1 deletions

diff --git a/policy-utils/src/main/java/org/onap/policy/drools/exception/CoderRuntimeException.java b/policy-utils/src/main/java/org/onap/policy/drools/exception/CoderRuntimeException.java
new file mode 100644
index 00000000..f98c12ba
--- /dev/null
+++ b/policy-utils/src/main/java/org/onap/policy/drools/exception/CoderRuntimeException.java
@@ -0,0 +1,32 @@
+/*
+ * ============LICENSE_START=======================================================
+ * Modifications Copyright (C) 2024 Nordix Foundation.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.drools.exception;
+
+/**
+ * Exceptions generated by coders.
+ */
+public class CoderRuntimeException extends RuntimeException {
+
+    private static final long serialVersionUID = 1L;
+
+    public CoderRuntimeException(Throwable cause) {
+        super(cause);
+    }
+
+}
diff --git a/policy-utils/src/main/java/org/onap/policy/drools/policies/DomainMaker.java b/policy-utils/src/main/java/org/onap/policy/drools/policies/DomainMaker.java
index 506b0977..84c81cf0 100644
--- a/policy-utils/src/main/java/org/onap/policy/drools/policies/DomainMaker.java
+++ b/policy-utils/src/main/java/org/onap/policy/drools/policies/DomainMaker.java
@@ -28,7 +28,6 @@ import lombok.NonNull;
 import org.apache.commons.lang3.StringUtils;
 import org.onap.policy.common.utils.coder.CoderException;
 import org.onap.policy.common.utils.coder.StandardCoder;
-import org.onap.policy.common.utils.coder.StandardValCoder;
 import org.onap.policy.common.utils.resources.ResourceUtils;
 import org.onap.policy.models.tosca.authorative.concepts.ToscaConceptIdentifier;
 import org.onap.policy.models.tosca.authorative.concepts.ToscaPolicy;
diff --git a/policy-utils/src/main/java/org/onap/policy/drools/policies/StandardValCoder.java b/policy-utils/src/main/java/org/onap/policy/drools/policies/StandardValCoder.java
new file mode 100644
index 00000000..26608f3e
--- /dev/null
+++ b/policy-utils/src/main/java/org/onap/policy/drools/policies/StandardValCoder.java
@@ -0,0 +1,142 @@
+/*--
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2020-2021 AT&T Intellectual Property. All rights reserved.
+ * Modifications Copyright (C) 2024 Nordix Foundation.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.drools.policies;
+
+import java.io.Reader;
+import java.io.StringReader;
+import java.io.StringWriter;
+import java.io.Writer;
+import lombok.NonNull;
+import lombok.ToString;
+import net.jimblackler.jsonschemafriend.GenerationException;
+import net.jimblackler.jsonschemafriend.Schema;
+import net.jimblackler.jsonschemafriend.SchemaStore;
+import net.jimblackler.jsonschemafriend.ValidationException;
+import net.jimblackler.jsonschemafriend.Validator;
+import org.onap.policy.common.utils.coder.CoderException;
+import org.onap.policy.common.utils.coder.StandardCoder;
+import org.onap.policy.drools.exception.CoderRuntimeException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Extension to the StandardCoder to support streaming validation against a Draft-07 Json schema specification.
+ * Extending specifically for drools policies - moved from common to here.
+ */
+
+@ToString
+public class StandardValCoder extends StandardCoder {
+
+    private static final Logger logger = LoggerFactory.getLogger(StandardValCoder.class);
+
+    private final Schema schema;
+
+    /**
+     * StandardCoder with validation.
+     */
+    public StandardValCoder(@NonNull String jsonSchema) {
+        try {
+            SchemaStore store = new SchemaStore();
+            this.schema = store.loadSchemaJson(jsonSchema);
+        } catch (GenerationException e) {
+            throw new CoderRuntimeException(e);
+        }
+    }
+
+    @Override
+    protected String toPrettyJson(Object object) {
+        try {
+            validate(gsonPretty.toJson(object));
+        } catch (CoderException e) {
+            throw new CoderRuntimeException(e);
+        }
+        return super.toPrettyJson(object);
+    }
+
+    @Override
+    protected String toJson(@NonNull Object object) {
+        var output = new StringWriter();
+        toJson(output, object);
+        return output.toString();
+    }
+
+    @Override
+    protected void toJson(@NonNull Writer target, @NonNull Object object) {
+        try {
+            validate(gson.toJson(object));
+        } catch (CoderException e) {
+            throw new CoderRuntimeException(e);
+        }
+        gson.toJson(object, object.getClass(), target);
+    }
+
+    @Override
+    protected <T> T fromJson(@NonNull Reader source, @NonNull Class<T> clazz) {
+        return convertFromDouble(clazz, gson.fromJson(source, clazz));
+    }
+
+    @Override
+    protected <T> T fromJson(String json, Class<T> clazz) {
+        try {
+            validate(json);
+        } catch (CoderException e) {
+            throw new CoderRuntimeException(e);
+        }
+        var reader = new StringReader(json);
+        return convertFromDouble(clazz, gson.fromJson(reader, clazz));
+    }
+
+    /**
+     * Is the json conformant?.
+     */
+    public boolean isConformant(@NonNull String json) {
+        try {
+            conformance(json);
+            return true;
+        } catch (Exception e) {
+            logger.error("JSON is not conformant to schema", e);
+            return false;
+        }
+    }
+
+    /**
+     * Check a json string for conformance against its schema definition.
+     */
+    public void conformance(@NonNull String json) throws CoderException {
+        validate(json);
+    }
+
+    private void validate(Object object) throws CoderException {
+        try {
+            final var validator = new Validator();
+            validator.validate(schema, object);
+        } catch (ValidationException exception) {
+            var error = String.format("JSON validation failed: %s", exception.getMessage());
+            logger.error(error);
+            throw new CoderException(error);
+        }
+    }
+
+    private void validate(String json) throws CoderException {
+        validate(gson.fromJson(json, Object.class));
+    }
+}