Merge branch '31-bugfix-commitment-tx-evaluation-error' into 'dev'

Fix commitment tx fee box evaluation error

Closes #31

See merge request ergo/rosen-bridge/contract!67

src/main/scala/rosen/bridge/scripts/Permit.es

@@ -38,7 +38,7 @@
     // Event Commitment Creation
     // [Permit(s), WID] => [Permit, Commitment, WID]
     val totalPermits = INPUTS.filter{(box:Box)
-       => box.tokens(0)._1 == SELF.tokens(0)._1
+       => box.tokens.size > 0 && box.tokens(0)._1 == SELF.tokens(0)._1
        }
        .map{(box:Box) => box.tokens(0)._2}
        .fold(0L, { (a: Long, b: Long) => a + b })

src/test/scala/contracts/ContractTest.scala

@@ -5,6 +5,7 @@ import org.ergoplatform.appkit.{ErgoProver, ErgoToken}
 import rosen.bridge.Contracts
 import scorex.util.encode.Base16
 import testUtils.{Boxes, Commitment, TestSuite}
+import java.io.{PrintWriter, StringWriter}
 
 
 class ContractTest extends TestSuite {
@@ -544,6 +545,32 @@ class ContractTest extends TestSuite {
     })
   }
 
+  property("test create new commitment with extra fee box") {
+    networkConfig._1.ergoClient.execute(ctx => {
+      try {
+        val commitment = new Commitment()
+        val prover = getProver()
+        val WID = Base16.decode(Boxes.getRandomHexString()).get
+        val box1 = Boxes.createBoxForUser(ctx, prover.getAddress, 1e5.toLong, new ErgoToken(WID, 1))
+        val box2 = Boxes.createBoxForUser(ctx, prover.getAddress, 1e9.toLong)
+        val permit = Boxes.createPermitBox(ctx, 10L, WID).convertToInputWith(Boxes.getRandomHexString(), 0)
+        val permitOut = Boxes.createPermitBox(ctx, 9L, WID)
+        val commitmentBox = Boxes.createCommitment(ctx, WID, commitment.requestId(), commitment.hash(WID), 1l)
+        val WIDOut = Boxes.createBoxCandidateForUser(ctx, prover.getAddress, 1e8.toLong, new ErgoToken(WID, 1))
+        val tx = ctx.newTxBuilder().addInputs(permit, box1, box2)
+          .fee(Configs.fee)
+          .sendChangeTo(prover.getAddress)
+          .addOutputs(permitOut, commitmentBox, WIDOut)
+          .build()
+        prover.sign(tx)
+      } catch {
+        case exp: Throwable =>
+          println(exp.toString)
+          fail("transaction not signed")
+      }
+    })
+  }
+
   property("test create new commitment with RWT second place of permit tokens") {
     networkConfig._1.ergoClient.execute(ctx => {
       assertThrows[AnyRef] {