eth-erc20

ERC20 interface and example giftable token contract
Log | Files | Refs | LICENSE

commit 30baee6d198dff8b6a5904840fe832c45589a8e4
parent 27ea14772f023326963edf127a9d0c55d1d797b6
Author: nolash <dev@holbrook.no>
Date:   Sun,  6 Dec 2020 14:12:49 +0100

Rewrite contract, new license, adds settable minters

Diffstat:
Apython/LICENSE | 45+++++++++++++++++++++++++++++++++++++++++++++
Mpython/giftable_erc20_token/runnable/deploy.py | 17+++++++++++++----
Msolidity/GiftableToken.abi.json | 2+-
Msolidity/GiftableToken.bin | 4++--
Msolidity/GiftableToken.sol | 234+++++++++++++++++++++++++------------------------------------------------------
5 files changed, 135 insertions(+), 167 deletions(-)

diff --git a/python/LICENSE b/python/LICENSE @@ -0,0 +1,45 @@ + Bprotocol Foundation (Bancor) LICENSE + +1. SUBJECT TO THE PROVISIONS SET FORTH HEREIN, INCLUDING “EFFECTIVE DATE”, YOU CAN + USE THIS CODE, FILE AND/OR SOFTWARE (“SOFTWARE”) ONLY IN CONNECTION WITH THE + BANCOR LIQUIDITY NETWORK AND/OR THE USE OF BNT ("PERMITTED USE"). ANY OTHER USE IS + PROHIBITED UNLESS THE USER SHALL RECEIVE AN EXPLICIT PRIOR WRITTEN APPROVAL FROM + BPROTOCOL FOUNDATION (BANCOR) TO DO SO (PLEASE CONTACT license@bancor.network IN + THIS REGARD), WHICH APPROVAL, IF GIVEN, MAY REQUIRE THE OBTAINMENT OF SEPARATE + LICENSE UNDER A DIFFERENT LICENSING MODEL. USING THIS SOFTWARE NOT IN THE FRAME OF + SUCH PERMITTED USE MAY, AMONG OTHERS, ALSO BREACH PATENT RIGHTS CONCERNING PATENTS + WHICH ARE EMBODIED/INCORPORATED/USED IN THIS SOFTWARE. + +2. ANY SUCH PERMITTED USE SHOULD ALSO COMPLY WITH THE TERMS BELOW. + +3. Redistribution and use in source and binary forms, with or without modification, + are permitted provided that the following conditions are met: +A. Redistributions of source code must retain the above copyright notice, this list + of conditions and the following disclaimer. +B. Redistributions in binary form must reproduce the above copyright notice, this + list of conditions and the following disclaimer in the documentation and/or other + materials provided with the distribution. +C. Neither the name of the copyright holder nor the names of its contributors may be + used to endorse or promote products derived from this software without specific prior + written permission. + +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY +EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES +OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT +SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT +OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, +OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS +SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +EFFECTIVE DATE: THIS LICENSE SHALL APPLY ONLY TO SOFTWARE (OR ANY VERSION THEREOF), +THAT HAS BEEN PUBLISHED AFTER THE DATE AND TIME THIS LICENSE HAS BEEN FIRST PUBLISHED +(“EFFECTIVE DATE”); Any previous versions published prior to the effective date (“Older Versions”) +shall remain licensed under the Apache License, Version 2.0 (the "Older Versions License"); +You may obtain a copy of the Older Version License at http://www.apache.org/licenses/LICENSE-2.0 +you may not use this file except in compliance with the Older Version License. Unless +required by applicable law or agreed to in writing, Older Versions distributed under the +Older Version License are distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS +OF ANY KIND, either express or implied. See the Older Version License for the specific +language governing permissions and limitations under the Older Version License. diff --git a/python/giftable_erc20_token/runnable/deploy.py b/python/giftable_erc20_token/runnable/deploy.py @@ -24,11 +24,11 @@ logging.getLogger('urllib3').setLevel(logging.WARNING) argparser = argparse.ArgumentParser() argparser.add_argument('-p', '--provider', dest='p', default='http://localhost:8545', type=str, help='Web3 provider url (http only)') -#argparser.add_argument('-g', '--gift', dest='g', action='store_true', help='If set, tokens will be gifted to all accounts in provider wallet') argparser.add_argument('-n', '--name', dest='n', default='Giftable Token', type=str, help='Token name') argparser.add_argument('-s', '--symbol', dest='s', default='GFT', type=str, help='Token symbol') argparser.add_argument('-d', '--decimals', dest='d', default=18, type=int, help='Token decimals') argparser.add_argument('-a', '--account', dest='a', action='append', type=str, help='Account to fund') +argparser.add_argument('-m', '--minter', dest='m', action='append', type=str, help='Minter to add') argparser.add_argument('--contracts-dir', dest='contracts_dir', type=str, default='.', help='Directory containing bytecode and abi') argparser.add_argument('-v', action='store_true', help='Be verbose') argparser.add_argument('amount', type=int, help='Initial token supply (will be owned by contract creator)') @@ -51,25 +51,34 @@ def main(): w3.eth.defaultAccount = w3.eth.accounts[0] c = w3.eth.contract(abi=abi, bytecode=bytecode) - tx_hash = c.constructor(args.n, args.s, args.d, args.amount).transact() + tx_hash = c.constructor(args.n, args.s, args.d).transact() rcpt = w3.eth.getTransactionReceipt(tx_hash) address = rcpt.contractAddress c = w3.eth.contract(abi=abi, address=address) logg.debug('construct tx {} address {}'.format(tx_hash.hex(), address)) + balance = c.functions.balanceOf(w3.eth.defaultAccount).call() - logg.info('balance {}: {}'.format(w3.eth.defaultAccount, balance)) + logg.info('balance {}: {} {}'.format(w3.eth.defaultAccount, balance, tx_hash)) if args.a != None: for a in args.a: if a == w3.eth.defaultAccount: continue - tx_hash = c.functions.gift(a, args.amount).transact() + tx_hash_mint = c.functions.mint(args.amount).transact() + tx_hash_transfer = c.functions.transfer(a, args.amount).transact() rcpt = w3.eth.getTransactionReceipt(tx_hash) balance = c.functions.balanceOf(a).call() logg.info('balance {}: {}'.format(a, balance)) + if args.m != None: + for a in args.m: + if a == w3.eth.defaultAccount: + continue + tx_hash_minter = c.functions.addMinter(a).transact() + logg.info('minter {}'.format(a)) + print(address) diff --git a/solidity/GiftableToken.abi.json b/solidity/GiftableToken.abi.json @@ -1 +1 @@ -[{"inputs":[{"internalType":"string","name":"_name","type":"string"},{"internalType":"string","name":"_symbol","type":"string"},{"internalType":"uint8","name":"_decimals","type":"uint8"},{"internalType":"uint256","name":"_initialSupply","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"_owner","type":"address"},{"indexed":true,"internalType":"address","name":"_spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"_value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"_oldTotal","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"_newTotal","type":"uint256"}],"name":"ChangedSupply","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"_from","type":"address"},{"indexed":true,"internalType":"address","name":"_to","type":"address"},{"indexed":false,"internalType":"uint256","name":"_value","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_spender","type":"address"},{"internalType":"uint256","name":"_value","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_to","type":"address"},{"internalType":"uint256","name":"_value","type":"uint256"}],"name":"gift","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_to","type":"address"},{"internalType":"uint256","name":"_value","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_from","type":"address"},{"internalType":"address","name":"_to","type":"address"},{"internalType":"uint256","name":"_value","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}] +[{"inputs":[{"internalType":"string","name":"_name","type":"string"},{"internalType":"string","name":"_symbol","type":"string"},{"internalType":"uint8","name":"_decimals","type":"uint8"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"_owner","type":"address"},{"indexed":true,"internalType":"address","name":"_spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"_value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"_from","type":"address"},{"indexed":true,"internalType":"address","name":"_to","type":"address"},{"indexed":false,"internalType":"uint256","name":"_value","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"_from","type":"address"},{"indexed":true,"internalType":"address","name":"_to","type":"address"},{"indexed":true,"internalType":"address","name":"_spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"_value","type":"uint256"}],"name":"TransferFrom","type":"event"},{"inputs":[{"internalType":"address","name":"_minter","type":"address"}],"name":"addMinter","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"}],"name":"allowances","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_spender","type":"address"},{"internalType":"uint256","name":"_value","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_value","type":"uint256"}],"name":"mint","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_minter","type":"address"}],"name":"removeMinter","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_to","type":"address"},{"internalType":"uint256","name":"_value","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_from","type":"address"},{"internalType":"address","name":"_to","type":"address"},{"internalType":"uint256","name":"_value","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}] diff --git a/solidity/GiftableToken.bin b/solidity/GiftableToken.bin @@ -1 +1 @@ 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+\ No newline at end of file diff --git a/solidity/GiftableToken.sol b/solidity/GiftableToken.sol @@ -1,160 +1,74 @@ -pragma solidity ^0.6.12; - -// SPDX-License-Identifier: SEE LICENSE IN LICENSE - -/* - * This is a MOCK token used for DEVELOPMENT PURPOSES ONLY. - * It allows anyone to freely mint tokens with themselves as beneficiaries - * Code is based on the ERC20Token contract from Bancor's contracts-solidity repository - * - * @dev ERC20 Standard Token implementation -*/ - -contract GiftableToken { //is IERC20Token, Utils { - //using SafeMath for uint256; - - string public name; - string public symbol; - uint8 public decimals; - uint256 public totalSupply; - mapping (address => uint256) public balanceOf; - mapping (address => mapping (address => uint256)) public allowance; - - /** - * @dev triggered when tokens are transferred between wallets - * - * @param _from source address - * @param _to target address - * @param _value transfer amount - */ - event Transfer(address indexed _from, address indexed _to, uint256 _value); - - /** - * @dev triggered when a wallet allows another wallet to transfer tokens from on its behalf - * - * @param _owner wallet that approves the allowance - * @param _spender wallet that receives the allowance - * @param _value allowance amount - */ - event Approval(address indexed _owner, address indexed _spender, uint256 _value); - - event ChangedSupply(uint256 _oldTotal, uint256 _newTotal); - - /** - * @dev initializes a new ERC20Token instance - * - * @param _name token name - * @param _symbol token symbol - * @param _decimals decimal points, for display purposes - * @param _initialSupply total supply of token units - */ - constructor(string memory _name, string memory _symbol, uint8 _decimals, uint256 _initialSupply) public { - // validate input - require(bytes(_name).length > 0, "ERR_INVALID_NAME"); - require(bytes(_symbol).length > 0, "ERR_INVALID_SYMBOL"); - - name = _name; - symbol = _symbol; - decimals = _decimals; - totalSupply = _initialSupply; - balanceOf[msg.sender] = _initialSupply; - } - - // validates an address - currently only checks that it isn't null - modifier validAddress(address _address) { - _validAddress(_address); - _; - } - - // error message binary size optimization - function _validAddress(address _address) internal pure { - require(_address != address(0), "ERR_INVALID_ADDRESS"); - } - - - function gift(address _to, uint256 _value) - public - virtual - validAddress(_to) - returns (bool) - { - totalSupply = totalSupply + _value; - uint256 oldSupply = balanceOf[_to]; - balanceOf[_to] = balanceOf[_to] + _value; - emit ChangedSupply(oldSupply, balanceOf[_to]); - emit Transfer(address(0x00), _to, _value); - return true; - } - - /** - * @dev transfers tokens to a given address - * throws on any error rather then return a false flag to minimize user errors - * - * @param _to target address - * @param _value transfer amount - * - * @return true if the transfer was successful, false if it wasn't - */ - function transfer(address _to, uint256 _value) - public - virtual - validAddress(_to) - returns (bool) - { - balanceOf[msg.sender] = balanceOf[msg.sender] - _value; - balanceOf[_to] = balanceOf[_to] + _value; - emit Transfer(msg.sender, _to, _value); - return true; - } - - /** - * @dev transfers tokens to a given address on behalf of another address - * throws on any error rather then return a false flag to minimize user errors - * - * @param _from source address - * @param _to target address - * @param _value transfer amount - * - * @return true if the transfer was successful, false if it wasn't - */ - function transferFrom(address _from, address _to, uint256 _value) - public - virtual - validAddress(_from) - validAddress(_to) - returns (bool) - { - allowance[_from][msg.sender] = allowance[_from][msg.sender] - _value; - balanceOf[_from] = balanceOf[_from] - _value; - balanceOf[_to] = balanceOf[_to] + _value; - emit Transfer(_from, _to, _value); - return true; - } - - /** - * @dev allows another account/contract to transfers tokens on behalf of the caller - * throws on any error rather then return a false flag to minimize user errors - * - * also, to minimize the risk of the approve/transferFrom attack vector - * (see https://docs.google.com/document/d/1YLPtQxZu1UAvO9cZ1O2RPXBbT0mooh4DYKjA_jp-RLM/), approve has to be called twice - * in 2 separate transactions - once to change the allowance to 0 and secondly to change it to the new allowance value - * - * @param _spender approved address - * @param _value allowance amount - * - * @return true if the approval was successful, false if it wasn't - */ - function approve(address _spender, uint256 _value) - public - virtual - validAddress(_spender) - returns (bool) - { - // if the allowance isn't 0, it can only be updated to 0 to prevent an allowance change immediately after withdrawal - require(_value == 0 || allowance[msg.sender][_spender] == 0, "ERR_INVALID_AMOUNT"); - - allowance[msg.sender][_spender] = _value; - emit Approval(msg.sender, _spender, _value); - return true; - } -} +pragma solidity >=0.6.12; + +// SPDX-License-Identifier: GPL-3.0-or-later + +contract GiftableToken { + + address owner; + mapping(address => bool) minters; + + string public name; + string public symbol; + uint8 public decimals; + uint256 public totalSupply; + mapping (address => uint256) public balanceOf; + mapping (address => mapping (address => uint256)) public allowances; + + event Transfer(address indexed _from, address indexed _to, uint256 _value); + event TransferFrom(address indexed _from, address indexed _to, address indexed _spender, uint256 _value); + event Approval(address indexed _owner, address indexed _spender, uint256 _value); + + constructor(string memory _name, string memory _symbol, uint8 _decimals) { + owner = msg.sender; + name = _name; + symbol = _symbol; + decimals = _decimals; + minters[msg.sender] = true; + } + + function mint(uint256 _value) public returns (bool) { + require(minters[msg.sender]); + + balanceOf[msg.sender] += _value; + totalSupply += _value; + + return true; + } + + function addMinter(address _minter) public returns (bool) { + require(msg.sender == owner); + + minters[_minter] = true; + + return true; + } + + function removeMinter(address _minter) public returns (bool) { + require(msg.sender == owner || msg.sender == _minter); + + minters[_minter] = false; + + return true; + } + + function transfer(address _to, uint256 _value) public returns (bool) { + balanceOf[msg.sender] -= _value; + balanceOf[_to] += _value; + emit Transfer(msg.sender, _to, _value); + return true; + } + + function transferFrom(address _from, address _to, uint256 _value) public returns (bool) { + allowances[_from][msg.sender] = allowances[_from][msg.sender] - _value; + balanceOf[_from] -= _value; + balanceOf[_to] += _value; + emit TransferFrom(_from, _to, msg.sender, _value); + return true; + } + + function approve(address _spender, uint256 _value) public returns (bool) { + allowances[msg.sender][_spender] += _value; + emit Approval(msg.sender, _spender, _value); + return true; + } +}