Updated parseTransaction to format parameters more meaningfully.

dist/ethers-wallet.js

@@ -2,7 +2,6 @@
 (function (Buffer){
 'use strict';
 
-var rlp = require('rlp');
 var scrypt = require('scrypt-js');
 
 var Contract = require('./lib/contract.js');
@@ -26,13 +25,7 @@ utils.defineProperty(exportUtils, 'Buffer', Buffer);
 utils.defineProperty(exportUtils, 'sha3', utils.sha3);
 utils.defineProperty(exportUtils, 'sha256', utils.sha256);
 
-// http://ethereum.stackexchange.com/questions/760/how-is-the-address-of-an-ethereum-contract-computed
-utils.defineProperty(exportUtils, 'getContractAddress', function(transaction) {
-    return utils.getAddress('0x' + utils.sha3(rlp.encode([
-        utils.hexOrBuffer(utils.getAddress(transaction.from)),
-        utils.hexOrBuffer(utils.hexlify(transaction.nonce, 'nonce'))
-    ])).slice(12).toString('hex'));
-});
+utils.defineProperty(exportUtils, 'getContractAddress', utils.getContractAddress);
 
 module.exports = Wallet;
 
@@ -105,7 +98,7 @@ utils.defineProperty(Wallet, 'randomish', new Randomish());
 module.exports = Wallet;
 
 }).call(this,require("buffer").Buffer)
-},{"./lib/contract.js":4,"./lib/providers.js":5,"./lib/randomish.js":6,"./lib/secret-storage.js":7,"./lib/signing-key.js":8,"./lib/units.js":9,"./lib/utils.js":10,"./lib/wallet.js":11,"buffer":41,"rlp":85,"scrypt-js":86}],2:[function(require,module,exports){
+},{"./lib/contract.js":4,"./lib/providers.js":5,"./lib/randomish.js":6,"./lib/secret-storage.js":7,"./lib/signing-key.js":8,"./lib/units.js":9,"./lib/utils.js":10,"./lib/wallet.js":11,"buffer":41,"scrypt-js":86}],2:[function(require,module,exports){
 (function (global,Buffer){
 'use strict';
 
@@ -1589,6 +1582,7 @@ var utils = require('./utils.js');
 var secp256k1 = new (elliptic.ec)('secp256k1');
 
 
+
 function SigningKey(privateKey) {
     if (!(this instanceof SigningKey)) { throw new Error('missing new'); }
 
@@ -1610,6 +1604,11 @@ function SigningKey(privateKey) {
     });
 }
 
+utils.defineProperty(SigningKey, 'recover', function(digest, r, s, recoveryParam) {
+    var publicKey = secp256k1.recoverPubKey(digest, {r: r, s: s}, recoveryParam);
+    publicKey = (new Buffer(publicKey.encode('hex', false), 'hex')).slice(1);
+    return utils.getAddress(utils.sha3(publicKey).slice(12).toString('hex'));
+});
 
 module.exports = SigningKey;
 
@@ -1698,6 +1697,8 @@ module.exports = {
 (function (Buffer){
 'use strict';
 
+var rlp = require('rlp');
+
 var BN = require('../node_modules/elliptic/node_modules/bn.js/lib/bn.js');
 var hash = require('../node_modules/elliptic/node_modules/hash.js/lib/hash.js');
 
@@ -2010,6 +2011,14 @@ function getIcapAddress(address) {
     return 'XE' + ibanChecksum('XE00' + base36) + base36;
 }
 
+// http://ethereum.stackexchange.com/questions/760/how-is-the-address-of-an-ethereum-contract-computed
+function getContractAddress(transaction) {
+    return getAddress('0x' + sha3(rlp.encode([
+        hexOrBuffer(getAddress(transaction.from)),
+        hexOrBuffer(hexlify(transaction.nonce, 'nonce'))
+    ])).slice(12).toString('hex'));
+}
+
 function cloneObject(object) {
     var clone = {};
     for (var key in object) { clone[key] = object[key]; }
@@ -2075,6 +2084,8 @@ module.exports = {
     getAddress: getAddress,
     getIcapAddress: getIcapAddress,
 
+    getContractAddress: getContractAddress,
+
     cloneObject: cloneObject,
 
     bnToBuffer: bnToBuffer,
@@ -2088,7 +2099,7 @@ module.exports = {
 }
 
 }).call(this,require("buffer").Buffer)
-},{"../node_modules/elliptic/node_modules/bn.js/lib/bn.js":29,"../node_modules/elliptic/node_modules/hash.js/lib/hash.js":31,"buffer":41}],11:[function(require,module,exports){
+},{"../node_modules/elliptic/node_modules/bn.js/lib/bn.js":29,"../node_modules/elliptic/node_modules/hash.js/lib/hash.js":31,"buffer":41,"rlp":85}],11:[function(require,module,exports){
 (function (global,Buffer){
 'use strict';
 
@@ -2203,6 +2214,58 @@ function Wallet(privateKey, provider) {
     });
 }
 
+utils.defineProperty(Wallet, 'parseTransaction', function(rawTransaction) {
+    rawTransaction = utils.hexOrBuffer(rawTransaction, 'rawTransaction');
+    var signedTransaction = rlp.decode(rawTransaction);
+
+    var raw = [];
+
+    var transaction = {};
+    transactionFields.forEach(function(fieldInfo, index) {
+        transaction[fieldInfo.name] = signedTransaction[index];
+        raw.push(signedTransaction[index]);
+    });
+
+    if (transaction.to) {
+        if (transaction.to.length === 0) {
+            delete transaction.to;
+        } else {
+            transaction.to = utils.getAddress('0x' + transaction.to.toString('hex'));
+        }
+    }
+
+    ['gasPrice', 'gasLimit', 'nonce', 'value'].forEach(function(name) {
+        if (!transaction[name]) { return; }
+        if (transaction[name].length === 0) {
+            transaction[name] = new utils.BN(0);
+        } else {
+            transaction[name] = new utils.BN(transaction[name].toString('hex'), 16);
+        }
+    });
+
+    /* @TODO: Maybe? In the future, all nonces stored as numbers? (obviously, major version change)
+    if (transaction.nonce) {
+        transaction.nonce = transaction.nonce.toNumber()
+    }
+    */
+
+    if (signedTransaction.length > 6 && signedTransaction[6].length === 1 &&
+        signedTransaction[7].length >= 1 && signedTransaction[7].length <= 32 &&
+        signedTransaction[8].length >= 1 && signedTransaction[7].length <= 32) {
+
+        transaction.v = signedTransaction[6][0];
+        transaction.r = signedTransaction[7];
+        transaction.s = signedTransaction[8];
+
+        var digest = utils.sha3(rlp.encode(raw));
+        try {
+            transaction.from = SigningKey.recover(digest, transaction.r, transaction.s, transaction.v - 27);
+        } catch (error) { }
+    }
+
+    return transaction;
+});
+
 utils.defineProperty(Wallet.prototype, 'getBalance', function(blockNumber) {
     var provider = this._provider;
 

index.js

@@ -1,6 +1,5 @@
 'use strict';
 
-var rlp = require('rlp');
 var scrypt = require('scrypt-js');
 
 var Contract = require('./lib/contract.js');
@@ -24,13 +23,7 @@ utils.defineProperty(exportUtils, 'Buffer', Buffer);
 utils.defineProperty(exportUtils, 'sha3', utils.sha3);
 utils.defineProperty(exportUtils, 'sha256', utils.sha256);
 
-// http://ethereum.stackexchange.com/questions/760/how-is-the-address-of-an-ethereum-contract-computed
-utils.defineProperty(exportUtils, 'getContractAddress', function(transaction) {
-    return utils.getAddress('0x' + utils.sha3(rlp.encode([
-        utils.hexOrBuffer(utils.getAddress(transaction.from)),
-        utils.hexOrBuffer(utils.hexlify(transaction.nonce, 'nonce'))
-    ])).slice(12).toString('hex'));
-});
+utils.defineProperty(exportUtils, 'getContractAddress', utils.getContractAddress);
 
 module.exports = Wallet;
 

lib/signing-key.js

@@ -7,6 +7,7 @@ var utils = require('./utils.js');
 var secp256k1 = new (elliptic.ec)('secp256k1');
 
 
+
 function SigningKey(privateKey) {
     if (!(this instanceof SigningKey)) { throw new Error('missing new'); }
 
@@ -28,5 +29,10 @@ function SigningKey(privateKey) {
     });
 }
 
+utils.defineProperty(SigningKey, 'recover', function(digest, r, s, recoveryParam) {
+    var publicKey = secp256k1.recoverPubKey(digest, {r: r, s: s}, recoveryParam);
+    publicKey = (new Buffer(publicKey.encode('hex', false), 'hex')).slice(1);
+    return utils.getAddress(utils.sha3(publicKey).slice(12).toString('hex'));
+});
 
 module.exports = SigningKey;

lib/utils.js

@@ -1,5 +1,7 @@
 'use strict';
 
+var rlp = require('rlp');
+
 var BN = require('../node_modules/elliptic/node_modules/bn.js/lib/bn.js');
 var hash = require('../node_modules/elliptic/node_modules/hash.js/lib/hash.js');
 
@@ -312,6 +314,14 @@ function getIcapAddress(address) {
     return 'XE' + ibanChecksum('XE00' + base36) + base36;
 }
 
+// http://ethereum.stackexchange.com/questions/760/how-is-the-address-of-an-ethereum-contract-computed
+function getContractAddress(transaction) {
+    return getAddress('0x' + sha3(rlp.encode([
+        hexOrBuffer(getAddress(transaction.from)),
+        hexOrBuffer(hexlify(transaction.nonce, 'nonce'))
+    ])).slice(12).toString('hex'));
+}
+
 function cloneObject(object) {
     var clone = {};
     for (var key in object) { clone[key] = object[key]; }
@@ -377,6 +387,8 @@ module.exports = {
     getAddress: getAddress,
     getIcapAddress: getIcapAddress,
 
+    getContractAddress: getContractAddress,
+
     cloneObject: cloneObject,
 
     bnToBuffer: bnToBuffer,

lib/wallet.js

@@ -111,6 +111,58 @@ function Wallet(privateKey, provider) {
     });
 }
 
+utils.defineProperty(Wallet, 'parseTransaction', function(rawTransaction) {
+    rawTransaction = utils.hexOrBuffer(rawTransaction, 'rawTransaction');
+    var signedTransaction = rlp.decode(rawTransaction);
+
+    var raw = [];
+
+    var transaction = {};
+    transactionFields.forEach(function(fieldInfo, index) {
+        transaction[fieldInfo.name] = signedTransaction[index];
+        raw.push(signedTransaction[index]);
+    });
+
+    if (transaction.to) {
+        if (transaction.to.length === 0) {
+            delete transaction.to;
+        } else {
+            transaction.to = utils.getAddress('0x' + transaction.to.toString('hex'));
+        }
+    }
+
+    ['gasPrice', 'gasLimit', 'nonce', 'value'].forEach(function(name) {
+        if (!transaction[name]) { return; }
+        if (transaction[name].length === 0) {
+            transaction[name] = new utils.BN(0);
+        } else {
+            transaction[name] = new utils.BN(transaction[name].toString('hex'), 16);
+        }
+    });
+
+    /* @TODO: Maybe? In the future, all nonces stored as numbers? (obviously, major version change)
+    if (transaction.nonce) {
+        transaction.nonce = transaction.nonce.toNumber()
+    }
+    */
+
+    if (signedTransaction.length > 6 && signedTransaction[6].length === 1 &&
+        signedTransaction[7].length >= 1 && signedTransaction[7].length <= 32 &&
+        signedTransaction[8].length >= 1 && signedTransaction[7].length <= 32) {
+
+        transaction.v = signedTransaction[6][0];
+        transaction.r = signedTransaction[7];
+        transaction.s = signedTransaction[8];
+
+        var digest = utils.sha3(rlp.encode(raw));
+        try {
+            transaction.from = SigningKey.recover(digest, transaction.r, transaction.s, transaction.v - 27);
+        } catch (error) { }
+    }
+
+    return transaction;
+});
+
 utils.defineProperty(Wallet.prototype, 'getBalance', function(blockNumber) {
     var provider = this._provider;
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "ethers-wallet",
-  "version": "1.0.1",
+  "version": "1.0.4",
   "description": "Ethereum wallet library.",
   "main": "index.js",
   "scripts": {

tests/test-transactions.js

@@ -17,9 +17,13 @@ module.exports = function(test) {
         rawTransaction.sign(privateKey);
         var ethereumLib = '0x' + rawTransaction.serialize().toString('hex');
 
-        var ethers = (new Wallet(privateKey)).sign(transaction);
+        var wallet = new Wallet(privateKey);
+        var ethers = wallet.sign(transaction);
 
         test.equal(ethers, ethereumLib, 'invalid transaction');
+
+        // @TODO: More testing on parsed transaction.
+        test.equal(wallet.address, Wallet.parseTransaction(ethers).from, 'invalid parseTransaction');
     }
 
     for (var i = 0; i < 10000; i++) {