1 files changed, 60 insertions, 0 deletions
diff --git a/sources/hv-collector-core/src/main/kotlin/org/onap/dcae/collectors/veshv/impl/HeaderValidator.kt b/sources/hv-collector-core/src/main/kotlin/org/onap/dcae/collectors/veshv/impl/HeaderValidator.kt
new file mode 100644
index 00000000..9d8accae
--- /dev/null
+++ b/sources/hv-collector-core/src/main/kotlin/org/onap/dcae/collectors/veshv/impl/HeaderValidator.kt
@@ -0,0 +1,60 @@
+/*
+ * ============LICENSE_START=======================================================
+ * dcaegen2-collectors-veshv
+ * ================================================================================
+ * Copyright (C) 2018 NOKIA
+ * ================================================================================
+ * 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.collectors.veshv.impl
+
+import arrow.core.Either
+import arrow.data.Nel
+import arrow.data.NonEmptyList
+import com.google.protobuf.Descriptors
+import org.onap.dcae.collectors.veshv.domain.headerRequiredFieldDescriptors
+import org.onap.dcae.collectors.veshv.domain.vesEventListenerVersionRegex
+import org.onap.ves.VesEventOuterClass.CommonEventHeader
+
+typealias Validator = (CommonEventHeader) -> List<ValidationError>
+
+object HeaderValidator {
+    private val validators = (listOf(validateEventListenerVersion()) +
+            headerRequiredFieldDescriptors.map { fieldDescriptor ->
+                validateRequiredField(fieldDescriptor)
+            })
+
+
+    fun validate(header: CommonEventHeader): Either<Nel<ValidationError>, CommonEventHeader> {
+        val result: List<ValidationError> = validators.flatMap { it(header) }
+
+        return Either.cond(result.isEmpty(), { header }, { NonEmptyList.fromListUnsafe(result) })
+    }
+
+    private fun validateEventListenerVersion(): Validator = { header: CommonEventHeader ->
+        if (!vesEventListenerVersionRegex.matches(header.vesEventListenerVersion))
+            listOf(ValidationError.VersionMismatch(header.vesEventListenerVersion))
+        else
+            emptyList()
+    }
+
+    private fun validateRequiredField(requiredField: Descriptors.FieldDescriptor): Validator =
+        { header: CommonEventHeader ->
+            if (!header.hasField(requiredField))
+                listOf(ValidationError.MissingField(requiredField.name))
+            else
+                emptyList()
+        }
+}