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/*
* ============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
internal typealias Validator = (CommonEventHeader) -> List<ValidationError>
internal 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()
}
}
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