Issue #12: Add application config for transformation configuration

src/main/kotlin/dev/dnpm/etl/processor/config/AppConfigProperties.kt

@@ -24,7 +24,8 @@ import org.springframework.boot.context.properties.ConfigurationProperties
 @ConfigurationProperties(AppConfigProperties.NAME)
 data class AppConfigProperties(
     var bwhcUri: String?,
-    var generator: PseudonymGenerator = PseudonymGenerator.BUILDIN
+    var generator: PseudonymGenerator = PseudonymGenerator.BUILDIN,
+    var transformations: List<TransformationProperties> = listOf()
 ) {
     companion object {
         const val NAME = "app"
@@ -78,4 +79,10 @@ data class KafkaTargetProperties(
 enum class PseudonymGenerator {
     BUILDIN,
     GPAS
-}
+}
+
+data class TransformationProperties(
+    val path: String,
+    val from: String,
+    val to: String
+)

src/main/kotlin/dev/dnpm/etl/processor/config/AppConfiguration.kt

@@ -25,6 +25,7 @@ import dev.dnpm.etl.processor.pseudonym.AnonymizingGenerator
 import dev.dnpm.etl.processor.pseudonym.Generator
 import dev.dnpm.etl.processor.pseudonym.GpasPseudonymGenerator
 import dev.dnpm.etl.processor.pseudonym.PseudonymizeService
+import dev.dnpm.etl.processor.services.Transformation
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty
 import org.springframework.boot.context.properties.EnableConfigurationProperties
 import org.springframework.context.annotation.Bean
@@ -71,5 +72,12 @@ class AppConfiguration {
         return Sinks.many().multicast().directBestEffort()
     }
 
+    @Bean
+    fun transformations(configProperties: AppConfigProperties): List<Transformation> {
+        return configProperties.transformations.map {
+            Transformation.of(it.path) from it.from to it.to
+        }
+    }
+
 }
 

src/main/kotlin/dev/dnpm/etl/processor/services/TransformationService.kt

@@ -1,3 +1,22 @@
+/*
+ * This file is part of ETL-Processor
+ *
+ * Copyright (c) 2023  Comprehensive Cancer Center Mainfranken, Datenintegrationszentrum Philipps-Universität Marburg and Contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package dev.dnpm.etl.processor.services
 
 import com.fasterxml.jackson.databind.ObjectMapper