server: Add AddressBalance model

server/app/com/xsn/explorer/models/AddressBalance.scala

@@ -0,0 +1,24 @@
+package com.xsn.explorer.models
+
+import play.api.libs.functional.syntax._
+import play.api.libs.json._
+
+case class AddressBalance(balance: BigInt, received: BigInt)
+
+object AddressBalance {
+  implicit val reads: Reads[AddressBalance] = {
+    val builder = (__ \ 'balance).read[BigDecimal] and (__ \ 'received).read[BigDecimal]
+
+    builder.apply { (balance, received) =>
+      AddressBalance(balance.toBigInt(), received.toBigInt())
+    }
+  }
+
+  implicit val writes: Writes[AddressBalance] = Writes { obj =>
+    val values = Map(
+      "balance" -> JsNumber(BigDecimal(obj.balance)),
+      "received" -> JsNumber(BigDecimal(obj.received)))
+
+    JsObject.apply(values)
+  }
+}