reorg code, integration publish/subscribe working, still some TODOs

blockchain/payment.js

@@ -0,0 +1,78 @@
+const ChainUtil = require('../chain-util');
+
+const outputValidation = {
+  publicKey: ChainUtil.validateIsPublicKey,
+  amount: ChainUtil.createValidateIsIntegerWithMin(1)
+};
+
+function validateOutputs(t) {
+  if (!ChainUtil.validateArray(t, function (output) {
+    return ChainUtil.validateObject(output, outputValidation).result;
+  })) {
+    return false;
+  }
+
+  if (t.length <= 0) {
+    return false;
+  }
+
+  return true;
+}
+
+const baseValidation = {
+  input: ChainUtil.validateIsPublicKey,
+  counter: ChainUtil.createValidateIsIntegerWithMin(1),
+  rewardAmount: ChainUtil.createValidateIsIntegerWithMin(0),
+  outputs: validateOutputs,
+  signature: ChainUtil.validateIsSignature
+}
+
+class Payment {
+  constructor(senderKeyPair, counter, outputs, rewardAmount) {
+    this.input = senderKeyPair.getPublic().encode('hex');
+    this.counter = counter;
+    this.rewardAmount = rewardAmount;
+    this.outputs = outputs;
+    this.signature = senderKeyPair.sign(Payment.hashToSign(this));
+
+    const verification = Payment.verify(this);
+    if (!verification.result) {
+      throw new Error(verification.reason);
+    }
+  }
+
+  static hashToSign(transaction) {
+    return ChainUtil.hash([
+      transaction.counter,
+      transaction.rewardAmount,
+      transaction.outputs]);
+  }
+
+  static createOutput(recipient, amount) {
+    return {
+      publicKey: recipient,
+      amount: amount
+    };
+  }
+
+  static verify(transaction) {
+    const validationRes = ChainUtil.validateObject(transaction, baseValidation);
+    if (!validationRes.result) {
+      return validationRes;
+    }
+
+    const verifyRes = ChainUtil.verifySignature(
+      transaction.input,
+      transaction.signature,
+      Payment.hashToSign(transaction));
+    if (!verifyRes.result) {
+      return verifyRes;
+    }
+
+    return {
+      result: true,
+    };
+  }
+}
+
+module.exports = Payment;