1 files changed, 78 insertions, 0 deletions
diff --git a/src/main/java/org/onap/dcae/restapi/EventValidator.java b/src/main/java/org/onap/dcae/restapi/EventValidator.java
new file mode 100644
index 00000000..f119b507
--- /dev/null
+++ b/src/main/java/org/onap/dcae/restapi/EventValidator.java
@@ -0,0 +1,78 @@
+/*
+ * ============LICENSE_START=======================================================
+ * PROJECT
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
+ * Copyright (C) 2019 Nokia. All rights reserved.s
+ * ================================================================================
+ * 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.dcae.restapi;
+
+import static java.util.stream.StreamSupport.stream;
+
+import com.github.fge.jackson.JsonLoader;
+import com.github.fge.jsonschema.core.report.ProcessingReport;
+import com.github.fge.jsonschema.main.JsonSchema;
+import java.util.Optional;
+import org.json.JSONObject;
+import org.onap.dcae.ApplicationException;
+import org.onap.dcae.ApplicationSettings;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.http.ResponseEntity;
+
+public class EventValidator {
+
+  private static final Logger log = LoggerFactory.getLogger(EventValidator.class);
+
+  private ApplicationSettings applicationSettings;
+
+  public EventValidator(ApplicationSettings applicationSettings) {
+    this.applicationSettings = applicationSettings;
+  }
+
+  public Optional<ResponseEntity<String>> validate(JSONObject jsonObject, String type, String version){
+    if (applicationSettings.jsonSchemaValidationEnabled()) {
+      if (jsonObject.has(type)) {
+        if (!conformsToSchema(jsonObject, version)) {
+          return errorResponse(ApiException.SCHEMA_VALIDATION_FAILED);
+        }
+      } else {
+        return errorResponse(ApiException.INVALID_JSON_INPUT);
+      }
+    }
+    return Optional.empty();
+  }
+
+  private boolean conformsToSchema(JSONObject payload, String version) {
+    try {
+      JsonSchema schema = applicationSettings.jsonSchema(version);
+      ProcessingReport report = schema.validate(JsonLoader.fromString(payload.toString()));
+      if (report.isSuccess()) {
+        return true;
+      }
+      log.warn("Schema validation failed for event: " + payload);
+      stream(report.spliterator(), false).forEach(e -> log.warn(e.getMessage()));
+      return false;
+    } catch (Exception e) {
+      throw new ApplicationException("Unable to validate against schema", e);
+    }
+  }
+
+  private Optional<ResponseEntity<String>> errorResponse(ApiException noServerResources) {
+    return Optional.of(ResponseEntity.status(noServerResources.httpStatusCode)
+        .body(noServerResources.toJSON().toString()));
+  }
+}