Enable json values for @AvroProp. (#855)

Co-authored-by: Daniel Fagerstrom <daniel.fagerstrom@svenskaspel.se>

Author: danielfagerstrom

avro4s-core/src/main/scala/com/sksamuel/avro4s/annotations.scala

@@ -1,5 +1,6 @@
 package com.sksamuel.avro4s
 
+import com.fasterxml.jackson.databind.JsonNode
 import scala.annotation.StaticAnnotation
 
 case class AvroAlias(override val alias: String) extends AvroAliasable
@@ -79,11 +80,11 @@ trait AvroNamespaceable extends AvroFieldReflection {
   val namespace: String
 }
 
-case class AvroProp(override val key: String, override val value:String) extends AvroProperty
+case class AvroProp(override val key: String, override val value: String | JsonNode) extends AvroProperty
 
 trait AvroProperty extends AvroFieldReflection {
   val key: String
-  val value: String
+  val value: String | JsonNode
 }
 
 /**

avro4s-core/src/main/scala/com/sksamuel/avro4s/typeutils/Annotations.scala

@@ -1,5 +1,6 @@
 package com.sksamuel.avro4s.typeutils
 
+import com.fasterxml.jackson.databind.JsonNode
 import com.sksamuel.avro4s.{AvroAliasable, AvroDoc, AvroDocumentable, AvroErasedName, AvroError, AvroFixed, AvroName, AvroNameable, AvroNamespace, AvroNoDefault, AvroProp, AvroProperty, AvroSortPriority, AvroTransient, AvroUnionPosition}
 import magnolia1.{CaseClass, TypeInfo}
 
@@ -18,7 +19,7 @@ class Annotations(annos: Seq[Any], inheritedAnnos: Seq[Any] = Nil) {
     case t: AvroAliasable => t.alias
   }.filterNot(_.trim.isEmpty)
 
-  def props: Map[String, String] = annos.collect {
+  def props: Map[String, String | JsonNode] = annos.collect {
     case t: AvroProperty => (t.key, t.value)
   }.toMap
 

avro4s-core/src/test/resources/props_annotation_json_field.json

@@ -0,0 +1,15 @@
+{
+  "type": "record",
+  "name": "Annotated",
+  "namespace": "com.sksamuel.avro4s.schema.AvroPropSchemaTest",
+  "fields": [
+    {
+      "name": "str",
+      "type": "string",
+      "terms": [
+        "foo",
+        "bar"
+      ]
+    }
+  ]
+}

avro4s-core/src/test/scala/com/sksamuel/avro4s/schema/AvroPropSchemaTest.scala

@@ -1,5 +1,6 @@
 package com.sksamuel.avro4s.schema
 
+import com.fasterxml.jackson.databind.{JsonNode, ObjectMapper}
 import com.sksamuel.avro4s.{AvroProp, AvroSchema}
 import org.scalatest.matchers.should.Matchers
 import org.scalatest.wordspec.AnyWordSpec
@@ -19,6 +20,13 @@ class AvroPropSchemaTest extends AnyWordSpec with Matchers {
       val schema = AvroSchema[Annotated]
       schema.toString(true) shouldBe expected.toString(true)
     }
+    "support json prop annotation on field" in {
+      val jsonArray = (new ObjectMapper()).createArrayNode().add("foo").add("bar")
+      case class Annotated(@AvroProp("terms", jsonArray) str: String)
+      val expected = new org.apache.avro.Schema.Parser().parse(getClass.getResourceAsStream("/props_annotation_json_field.json"))
+      val schema = AvroSchema[Annotated]
+      schema.toString(true) shouldBe expected.toString(true)
+    }
 //    "support props annotations on scala enums" in {
 //      case class Annotated(@AvroProp("cold", "play") colours: Colours.Value)
 //      val expected = new org.apache.avro.Schema.Parser().parse(getClass.getResourceAsStream("/props_annotation_scala_enum.json"))