server: Add TransactionLogic

server/app/com/xsn/explorer/services/logic/TransactionLogic.scala

@@ -0,0 +1,24 @@
+package com.xsn.explorer.services.logic
+
+import com.alexitc.playsonify.core.ApplicationResult
+import com.alexitc.playsonify.models.ApplicationError
+import com.xsn.explorer.models.{Address, Transaction, TransactionVIN, TransactionVOUT}
+import org.scalactic.{One, Or}
+
+class TransactionLogic {
+
+  def getAddress(vout: TransactionVOUT, error: ApplicationError): ApplicationResult[Address] = {
+    val maybe = vout.address
+    Or.from(maybe, One(error))
+  }
+
+  def getVIN(tx: Transaction, error: ApplicationError): ApplicationResult[TransactionVIN] = {
+    val maybe = tx.vin
+    Or.from(maybe, One(error))
+  }
+
+  def getVOUT(vin: TransactionVIN, previousTX: Transaction, error: ApplicationError): ApplicationResult[TransactionVOUT] = {
+    val maybe = previousTX.vout.find(_.n == vin.voutIndex)
+    Or.from(maybe, One(error))
+  }
+}