Merge pull request #440 from nodar-chkuaselidze/mtx/from-json

MTX - Recover view from JSON

lib/primitives/mtx.js

@@ -21,6 +21,7 @@ const consensus = require('../protocol/consensus');
 const policy = require('../protocol/policy');
 const Amount = require('../btc/amount');
 const Stack = require('../script/stack');
+const util = require('../utils/util');
 
 /**
  * MTX
@@ -1460,6 +1461,32 @@ class MTX extends TX {
     return super.getJSON(network, this.view);
   }
 
+  /**
+   * Inject properties from a json object
+   * @param {Object} json
+   */
+
+  fromJSON(json) {
+    super.fromJSON(json);
+
+    for (let i = 0; i < json.inputs.length; i++) {
+      const input = json.inputs[i];
+      const {prevout} = input;
+
+      if (!input.coin)
+        continue;
+
+      const coin = Coin.fromJSON(input.coin);
+
+      coin.hash = util.revHex(prevout.hash);
+      coin.index = prevout.index;
+
+      this.view.addCoin(coin);
+    }
+
+    return this;
+  }
+
   /**
    * Instantiate a transaction from a
    * jsonified transaction object.

test/tx-test.js

@@ -10,6 +10,7 @@ const random = require('bcrypto/lib/random');
 const util = require('../lib/utils/util');
 const consensus = require('../lib/protocol/consensus');
 const TX = require('../lib/primitives/tx');
+const MTX = require('../lib/primitives/mtx');
 const Output = require('../lib/primitives/output');
 const Outpoint = require('../lib/primitives/outpoint');
 const Script = require('../lib/script/script');
@@ -1102,4 +1103,19 @@ describe('TX', function() {
       assert.strictEqual(json.index, index);
     }
   });
+
+  it('should recover coins from JSON', () => {
+    const [tx, view] = tx2.getTX();
+
+    const mtx = MTX.fromTX(tx);
+    mtx.view = view;
+
+    // get input value as example
+    const value1 = mtx.getInputValue();
+
+    const mtx2 = MTX.fromJSON(mtx.toJSON());
+    const value2 = mtx2.getInputValue();
+
+    assert.strictEqual(value1, value2);
+  });
 });