Add Amount.strict_mode for toggling range validation

Author: wltsmrz

src/js/ripple/amount.js

@@ -30,6 +30,12 @@ function Amount() {
   this._issuer      = new UInt160();
 }
 
+/**
+ * Set strict_mode = false to disable amount range checking
+ */
+
+Amount.strict_mode = true;
+
 var consts = {
   currency_xns:      0,
   currency_one:      1,
@@ -338,6 +344,9 @@ Amount.prototype.canonicalize = function(roundingMode) {
 };
 
 Amount.prototype._check_limits = function() {
+  if (!Amount.strict_mode) {
+    return this;
+  }
   if (this._value.isNaN() || this._value.isZero()) {
     return this;
   }

src/js/ripple/serializedtypes.js

@@ -8,10 +8,11 @@
 
 var assert    = require('assert');
 var extend    = require('extend');
+var GlobalBigNumber = require('bignumber.js');
 var binformat = require('./binformat');
 var utils     = require('./utils');
+var Amount = require('./amount');
 var sjcl      = utils.sjcl;
-var GlobalBigNumber = require('bignumber.js');
 
 var UInt128   = require('./uint128').UInt128;
 var UInt160   = require('./uint160').UInt160;
@@ -288,6 +289,7 @@ var STCurrency = new SerializedType({
 var STAmount = exports.Amount = new SerializedType({
   serialize: function (so, val) {
     var amount = Amount.from_json(val);
+
     if (!amount.is_valid()) {
       throw new Error('Not a valid Amount object.');
     }
@@ -301,12 +303,12 @@ var STAmount = exports.Amount = new SerializedType({
     if (amount.is_native()) {
       var valueHex = value.abs().toString(16);
 
-      if (value.abs().greaterThan(Amount.bi_xns_max)) {
+      if (Amount.strict_mode && value.abs().greaterThan(Amount.bi_xns_max)) {
         throw new Error('Value out of bounds');
       }
 
       // Enforce correct length (64 bits)
-      if (valueHex.length > 16) {
+      if (Amount.strict_mode && valueHex.length > 16) {
         throw new Error('Value out of bounds');
       }
 

test/serializedobject-test.js

@@ -1,6 +1,7 @@
-var assert           = require('assert');
+var assert = require('assert');
 var SerializedObject = require('ripple-lib').SerializedObject;
-var sjcl             = require('ripple-lib').sjcl;
+var Amount = require('ripple-lib').Amount;
+var sjcl = require('ripple-lib').sjcl;
 
 // Shortcuts
 var hex = sjcl.codec.hex;
@@ -54,6 +55,56 @@ describe('Serialized object', function() {
     });
   });
 
+  describe('#from_json(v).to_json() == v -- invalid amount', function(){
+    it('outputs same as passed to from_json', function() {
+      var input_json = {
+        Account: 'rUR9gTCcrUY9fMkz9rwcM9urPREh3LKXoW',
+        Fee: '10',
+        Flags: 0,
+        Sequence: 65,
+        SigningPubKey: '033D0B1FB932E0408C119107483190B61561DCE8529E29CB5D1C69128DA54DA715',
+        TakerGets: '2188313981504612096',
+        TakerPays: {
+          currency: 'USD',
+          issuer: 'r9rp9MUFRJVCVLRm3MTmUvSPNBSL3BuEFx',
+          value: '99999999999'
+        },
+        TransactionType: 'OfferCreate',
+        TxnSignature: '304602210085C6AE945643150E6D450CF796E45D74FB24B4E03E964A29CC6AFFEB346C77C80221009BE1B6678CF6C2E61F8F2696144C75AFAF66DF4FC0733DF9118EDEFEEFE33243'
+      };
+
+      assert.throws(function() {
+        SerializedObject.from_json(input_json).to_json();
+      });
+    });
+  });
+
+  describe('#from_json(v).to_json() == v -- invalid amount, strict_mode = false', function(){
+    it('outputs same as passed to from_json', function() {
+      var input_json = {
+        Account: 'rUR9gTCcrUY9fMkz9rwcM9urPREh3LKXoW',
+        Fee: '10',
+        Flags: 0,
+        Sequence: 65,
+        SigningPubKey: '033D0B1FB932E0408C119107483190B61561DCE8529E29CB5D1C69128DA54DA715',
+        TakerGets: '2188313981504612096',
+        TakerPays: {
+          currency: 'USD',
+          issuer: 'r9rp9MUFRJVCVLRm3MTmUvSPNBSL3BuEFx',
+          value: '99999999999'
+        },
+        TransactionType: 'OfferCreate',
+        TxnSignature: 'FFFFFF210085C6AE945643150E6D450CF796E45D74FB24B4E03E964A29CC6AFFEB346C77C80221009BE1B6678CF6C2E61F8F2696144C75AFAF66DF4FC0733DF9118EDEFEEFE33243'
+      };
+
+      var strictMode = Amount.strict_mode;
+      Amount.strict_mode = false;
+      var output_json = SerializedObject.from_json(input_json).to_json();
+      assert.deepEqual(input_json, output_json);
+      Amount.strict_mode = strictMode;
+    });
+  });
+
   describe('#from_json', function() {
     it('understands TransactionType as a Number', function() {
       var input_json = {