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include **/data/ERC20.json **/data/GiftableToken.json **/data/GiftableToken.bin *requirements.txt CHANGELOG LICENSE WAIVER WAIVER.asc **/data/.chainlib

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# external imports
from giftable_erc20_token import GiftableToken
# local imports
from ge_capped_token.data import data_dir
class CappedToken(GiftableToken):
@staticmethod
def abi():
if CappedToken.__abi == None:
f = open(os.path.join(data_dir, 'CappedToken.json'), 'r')
CappedToken.__abi = json.load(f)
f.close()
return CappedToken.__abi
@staticmethod
def bytecode(version=None):
if CappedToken.__bytecode == None:
f = open(os.path.join(data_dir, 'CappedToken.bin'))
CappedToken.__bytecode = f.read()
f.close()
return CappedToken.__bytecode

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python/ge_capped_token/data/CappedToken.json Normal file
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python/ge_capped_token/data/CappedToken.metadata.json Normal file
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python/ge_capped_token/data/__init__.py Normal file
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import os
data_dir = os.path.realpath(os.path.dirname(__file__))

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# standard imports
import logging
import time
# external imports
from chainlib.eth.unittest.ethtester import EthTesterCase
from chainlib.connection import RPCConnection
from chainlib.eth.nonce import RPCNonceOracle
from chainlib.eth.tx import receipt
from chainlib.eth.address import to_checksum_address
# local imports
from ge_capped_token import CappedToken
logg = logging.getLogger(__name__)
class TestCappedToken(EthTesterCase):
expire = 0
def setUp(self):
super(TestCappedToken, self).setUp()
self.conn = RPCConnection.connect(self.chain_spec, 'default')
nonce_oracle = RPCNonceOracle(self.accounts[0], conn=self.conn)
c = CappedToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
self.symbol = 'FOO'
self.name = 'Foo Token'
self.decimals = 16
(tx_hash, o) = c.constructor(self.accounts[0], self.name, self.symbol, self.decimals, expire=self.expire)
self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
self.assertEqual(r['status'], 1)
self.address = to_checksum_address(r['contract_address'])
logg.debug('published on address {} with hash {}'.format(self.address, tx_hash))
self.initial_supply = 1 << 40
(tx_hash, o) = c.mint_to(self.address, self.accounts[0], self.accounts[0], self.initial_supply)
r = self.conn.do(o)
o = receipt(tx_hash)
r = self.conn.do(o)
self.assertEqual(r['status'], 1)
class TestCappedExpireToken(TestCappedToken):
expire = int(time.time()) + 100000
def setUp(self):
super(TestCappedExpireToken, self).setUp()

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python/requirements.txt Normal file
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confini~=0.6.1
chainlib-eth~=0.4.17
chainlib~=0.4.12
potaahto~=0.1.1
eth_erc20~=0.7.4

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#!/bin/bash
export PYTHONPATH=${PYTHONPATH}:.
>&2 echo "using pythonpath $PYTHONPATH"
set -e
set -x
for f in `ls tests/*.py`; do
python $f
if [ $? -gt 0 ]; then
exit 1
fi
done
set +x
set +e

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[metadata]
name = ge-capped-token
version = 0.0.1
description = ERC20 token that can be minted, capped and expired.
author = Louis Holbrook
author_email = dev@holbrook.no
url = https://git.grassecon.net/grassrootseconomics/ge-capped-token
keywords =
dlt
ethereum
token
blockchain
cryptocurrency
classifiers =
Programming Language :: Python :: 3
Operating System :: OS Independent
Development Status :: 4 - Beta
Environment :: Console
Intended Audience :: Developers
License :: OSI Approved :: GNU Affero General Public License v3 or later (AGPLv3+)
Topic :: Internet
Topic :: Software Development :: Libraries
#Topic :: Blockchain :: EVM
license = AGPLv3+
licence_files =
LICENSE
[options]
include_package_data = True
python_requires = >= 3.8
packages =
giftable_erc20_token
giftable_erc20_token.runnable
giftable_erc20_token.unittest
giftable_erc20_token.data
eth_erc20
eth_erc20.data
eth_erc20.runnable
static_token.data
[options.package_data]
* =
data/GiftableToken.json
data/GiftableToken.bin
data/StaticToken.json
data/StaticToken.bin
data/ERC20.json
[options.entry_points]
console_scripts =
capped-token-publish = giftable_erc20_token.runnable.publish:main

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from setuptools import setup
requirements = []
f = open('requirements.txt', 'r')
while True:
l = f.readline()
if l == '':
break
requirements.append(l.rstrip())
f.close()
test_requirements = []
f = open('test_requirements.txt', 'r')
while True:
l = f.readline()
if l == '':
break
test_requirements.append(l.rstrip())
f.close()
setup(
package_data={
'': [
'data/GiftableToken.abi.json',
'data/GiftableToken.bin',
],
},
include_package_data=True,
install_requires=requirements,
tests_require=test_requirements,
)

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python/test_requirements.txt Normal file
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eth_tester==0.5.0b3
py-evm==0.3.0a20
pytest==6.0.1

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python/tests/test_erc20_interface.py Normal file
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# import logging
import unittest
# local imports
from ge_capped_token.unittest import TestCappedToken
from eth_erc20.unittest import TestInterface
class TestBasic(TestCappedToken, TestInterface):
pass
if __name__ == '__main__':
unittest.main()

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# standard imports
import os
import unittest
import json
import logging
import datetime
# external imports
from chainlib.eth.constant import ZERO_ADDRESS
from chainlib.eth.nonce import RPCNonceOracle
from chainlib.eth.tx import receipt
from chainlib.eth.block import (
block_latest,
block_by_number,
)
# local imports
from giftable_erc20_token import GiftableToken
from giftable_erc20_token.unittest import TestGiftableExpireToken
logging.basicConfig(level=logging.DEBUG)
logg = logging.getLogger()
testdir = os.path.dirname(__file__)
class TestExpire(TestGiftableExpireToken):
def setUp(self):
super(TestExpire, self).setUp()
def test_expires(self):
mint_amount = self.initial_supply
nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
c = GiftableToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
(tx_hash, o) = c.transfer(self.address, self.accounts[0], self.accounts[1], int(mint_amount / 2))
r = self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
self.assertEqual(r['status'], 1)
self.backend.time_travel(self.expire + 60)
o = block_latest()
r = self.rpc.do(o)
o = block_by_number(r)
r = self.rpc.do(o)
self.assertGreaterEqual(r['timestamp'], self.expire)
nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
c = GiftableToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
(tx_hash, o) = c.transfer(self.address, self.accounts[0], self.accounts[1], 1)
r = self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
self.assertEqual(r['status'], 0)
nonce_oracle = RPCNonceOracle(self.accounts[1], self.rpc)
c = GiftableToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
(tx_hash, o) = c.transfer(self.address, self.accounts[1], self.accounts[0], 1)
r = self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
self.assertEqual(r['status'], 0)
o = c.balance_of(self.address, self.accounts[0], sender_address=self.accounts[0])
r = self.rpc.do(o)
balance = c.parse_balance(r)
self.assertEqual(balance, int(mint_amount / 2))
o = c.balance_of(self.address, self.accounts[1], sender_address=self.accounts[0])
r = self.rpc.do(o)
balance += c.parse_balance(r)
self.assertEqual(balance, mint_amount)
o = c.total_supply(self.address, sender_address=self.accounts[0])
r = self.rpc.do(o)
supply = c.parse_balance(r)
self.assertEqual(supply, mint_amount)
def test_burn(self):
mint_amount = self.initial_supply
nonce_oracle = RPCNonceOracle(self.accounts[1], self.rpc)
c = GiftableToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
(tx_hash, o) = c.burn(self.address, self.accounts[1], int(mint_amount / 4))
self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
self.assertEqual(r['status'], 0)
nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
c = GiftableToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
(tx_hash, o) = c.burn(self.address, self.accounts[0], int(mint_amount / 4))
self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
self.assertEqual(r['status'], 1)
o = c.burned(self.address, sender_address=self.accounts[0])
r = self.rpc.do(o)
burned = c.parse_balance(r)
self.assertEqual(burned, int(mint_amount / 4))
o = c.balance_of(self.address, self.accounts[0], sender_address=self.accounts[0])
r = self.rpc.do(o)
balance = c.parse_balance(r)
self.assertEqual(balance, mint_amount - burned)
o = c.total_supply(self.address, sender_address=self.accounts[0])
r = self.rpc.do(o)
balance = c.parse_balance(r)
self.assertEqual(balance, mint_amount - burned)
o = c.total_minted(self.address, sender_address=self.accounts[0])
r = self.rpc.do(o)
balance = c.parse_balance(r)
self.assertEqual(balance, mint_amount)
if __name__ == '__main__':
unittest.main()

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solidity/CappedToken.sol Normal file
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pragma solidity >=0.8.0;
// SPDX-License-Identifier: AGPL-3.0-or-later
// File-Version: 1
contract CappedToken {
// Implements EIP173
address public owner;
// Implements Writer
mapping(address => bool) writer;
// Implements ERC20
string public name;
// Implements ERC20
string public symbol;
// Implements ERC20
uint8 public decimals;
// Implements ERC20
mapping (address => uint256) public balanceOf;
// Implements ERC20
mapping (address => mapping (address => uint256)) public allowance;
// Implements Burner
uint256 public totalMinted;
// Implements Burner
uint256 public totalBurned;
// Implements Expire
uint256 public expires;
bool expired;
// Implements Cap
uint256 public maxSupply;
mapping(address => bool) writers;
// Implements ERC20
event Transfer(address indexed _from, address indexed _to, uint256 _value);
// Implements ERC20
event TransferFrom(address indexed _from, address indexed _to, address indexed _spender, uint256 _value);
// Implements ERC20
event Approval(address indexed _owner, address indexed _spender, uint256 _value);
// Implements Minter
event Mint(address indexed _minter, address indexed _beneficiary, uint256 _value);
// Implement Expire
event Expired(uint256 _timestamp);
event ExpiryChange(uint256 indexed _oldTimestamp, uint256 _newTimestamp);
// Implements Writer
event WriterAdded(address _writer);
// Implements Writer
event WriterRemoved(address _writer);
// Implements Burner
event Burn(uint256 _value);
// Implements Cap
event Cap(uint256 indexed _oldCap, uint256 _newCap);
// Implements Seal
event SealStateChange(bool indexed _final, uint256 _sealState);
// Implements Seal
uint256 public sealState;
uint8 constant WRITER_STATE = 1;
uint8 constant CAP_STATE = 2;
uint8 constant EXPIRY_STATE = 4;
uint256 constant public maxSealState = 15;
constructor(string memory _name, string memory _symbol, uint8 _decimals, uint256 _expireTimestamp) {
owner = msg.sender;
name = _name;
symbol = _symbol;
decimals = _decimals;
expires = _expireTimestamp;
}
// Change max token supply.
// Can only increase supply cap, not decrease.
function setMaxSupply(uint256 _cap) public {
require(!isSealed(CAP_STATE));
require(msg.sender == owner);
require(_cap > totalSupply());
emit Cap(maxSupply, _cap);
maxSupply = _cap;
}
function seal(uint256 _state) public returns(uint256) {
require(_state < maxSealState + 1, 'ERR_INVALID_STATE');
require(_state & sealState == 0, 'ERR_ALREADY_LOCKED');
sealState |= _state;
emit SealStateChange(sealState == maxSealState, sealState);
return uint256(sealState);
}
function isSealed(uint256 _state) public view returns(bool) {
require(_state < maxSealState);
if (_state == 0) {
return sealState == maxSealState;
}
return _state & sealState == _state;
}
function setExpire(uint256 _timestamp) public {
require(!isSealed(EXPIRY_STATE), "ERR_SEALED");
require(_timestamp < block.timestamp, "ERR_EXPIRE_PAST");
uint256 oldTimestamp;
oldTimestamp = expires;
expires = _timestamp;
emit ExpiryChange(oldTimestamp, expires);
}
// Implements ERC20
function totalSupply() public view returns (uint256) {
return totalMinted - totalBurned;
}
// Implements Minter
function mintTo(address _to, uint256 _value) public returns (bool) {
require(writers[msg.sender] || msg.sender == owner);
require(applyExpiry() == 0);
if (maxSupply > 0) {
require(totalSupply() + _value <= maxSupply);
}
balanceOf[_to] += _value;
totalMinted += _value;
emit Mint(msg.sender, _to, _value);
return true;
}
// Implements Minter
// Implements ERC5679Ext20
function mint(address _to, uint256 _value, bytes calldata _data) public {
_data;
mintTo(_to, _value);
}
// Implements Writer
function addWriter(address _minter) public returns (bool) {
require(!isSealed(WRITER_STATE), "ERR_SEALED");
require(msg.sender == owner);
writers[_minter] = true;
return true;
}
// Implements Writer
function deleteWriter(address _minter) public returns (bool) {
require(!isSealed(WRITER_STATE), "ERR_SEALED");
require(msg.sender == owner || msg.sender == _minter);
writers[_minter] = false;
return true;
}
// Implements Writer
function isWriter(address _minter) public view returns(bool) {
return writers[_minter] || _minter == owner;
}
// Implements Expire
function applyExpiry() public returns(uint8) {
if (expires == 0) {
return 0;
}
if (expired) {
return 1;
}
if (block.timestamp >= expires) {
expired = true;
emit Expired(block.timestamp);
return 2;
}
return 0;
}
// Implements ERC20
function transfer(address _to, uint256 _value) public returns (bool) {
require(applyExpiry() == 0);
require(balanceOf[msg.sender] >= _value);
balanceOf[msg.sender] -= _value;
balanceOf[_to] += _value;
emit Transfer(msg.sender, _to, _value);
return true;
}
// Implements Burner
function burn(uint256 _value) public returns (bool) {
require(msg.sender == owner, 'ERR_ACCESS');
require(balanceOf[msg.sender] >= _value, 'ERR_FUNDS');
balanceOf[msg.sender] -= _value;
totalBurned += _value;
emit Burn(_value);
return true;
}
// Implements Burner
function burn() public returns(bool) {
return burn(balanceOf[msg.sender]);
}
// Implements Burner
// Implements ERC5679Ext20
function burn(address _from, uint256 _value, bytes calldata _data) public {
require(msg.sender == _from, 'ERR_NOT_SELF');
_data;
burn(_value);
}
// Implements ERC20
function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
require(applyExpiry() == 0);
require(allowance[_from][msg.sender] >= _value);
require(balanceOf[_from] >= _value);
allowance[_from][msg.sender] = allowance[_from][msg.sender] - _value;
balanceOf[_from] -= _value;
balanceOf[_to] += _value;
emit TransferFrom(_from, _to, msg.sender, _value);
return true;
}
// Implements ERC20
function approve(address _spender, uint256 _value) public returns (bool) {
require(applyExpiry() == 0);
if (_value > 0) {
require(allowance[msg.sender][_spender] == 0);
}
allowance[msg.sender][_spender] = _value;
emit Approval(msg.sender, _spender, _value);
return true;
}
// Implements EIP173
function transferOwnership(address _newOwner) public returns (bool) {
require(msg.sender == owner);
owner = _newOwner;
return true;
}
// Implements EIP165
function supportsInterface(bytes4 _sum) public pure returns (bool) {
if (_sum == 0xb61bc941) { // ERC20
return true;
}
if (_sum == 0x449a52f8) { // Minter
return true;
}
if (_sum == 0x01ffc9a7) { // EIP165
return true;
}
if (_sum == 0x9493f8b2) { // EIP173
return true;
}
if (_sum == 0xabe1f1f5) { // Writer
return true;
}
if (_sum == 0xb1110c1b) { // Burner
return true;
}
if (_sum == 0x841a0e94) { // Expire
return true;
}
return false;
}
}

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SOLC = /usr/bin/solc
all:
$(SOLC) --bin CappedToken.sol --evm-version byzantium | awk 'NR>3' > CappedToken.bin
$(SOLC) --abi CappedToken.sol --evm-version byzantium | awk 'NR>3' > CappedToken.json
$(SOLC) --metadata CappedToken.sol --evm-version byzantium | awk 'NR>3' > CappedToken.metadata.json
truncate -s -1 CappedToken.bin
install: all
cp -v *.json ../python/ge_capped_token/data/
cp -v *.bin ../python/ge_capped_token/data/