Extend _txInputFormatter with hex prefix check

CHANGELOG.md

@@ -232,3 +232,7 @@ Released with 1.0.0-beta.37 code base.
 ## [Unreleased]
 
 ## [1.2.10]
+
+### Fixed
+
+- Extend `_txInputFormatter` with hex prefix check (#3317)

packages/web3-core-helpers/src/formatters.js

@@ -146,6 +146,10 @@ var _txInputFormatter = function (options) {
         delete options.input;
     }
 
+    if (options.data && !options.data.startsWith('0x')) {
+        options.data = '0x' + options.data;
+    }
+
     if (options.data && !utils.isHex(options.data)) {
         throw new Error('The data field must be HEX encoded data.');
     }

packages/web3-eth-contract/src/index.js

@@ -536,6 +536,10 @@ Contract.prototype._encodeMethodABI = function _encodeMethodABI() {
         if(!this._deployData)
             throw new Error('The contract has no contract data option set. This is necessary to append the constructor parameters.');
 
+        if(!this._deployData.startsWith('0x')) {
+            this._deployData = '0x' + this._deployData;
+        }
+
         return this._deployData + paramsABI;
 
     }

test/formatters.inputTransactionFormatter.js

@@ -83,6 +83,21 @@ var tests = [{
         gas: '0x3e8',
         gasPrice: '0x3e8'
     }
+}, {
+    input: {
+        data: '34234bf23bf4234',
+        value: '100',
+        from: 'XE7338O073KYGTWWZN0F2WZ0R8PX5ZPPZS',
+        gas: '1000',
+        gasPrice: '1000'
+    },
+    result: {
+        data: '0x34234bf23bf4234',
+        value: '0x64',
+        from: '0x00c5496aee77c1ba1f0854206a26dda82a81d6d8',
+        gas: '0x3e8',
+        gasPrice: '0x3e8'
+    }
 }];
 
 describe('formatters', function () {