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eth/client: add transfer_erc20 function (#197)
* spec/fixtures: add erc20 stub * eth/client: add transfer_erc20 function * spec: add erc20 tests * docs: update readme * spec: add more erc20 tests
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,143 @@ | ||
| // SPDX-License-Identifier: MIT | ||
| // OpenZeppelin Contracts (v4.8.0 - simplified) | ||
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| pragma solidity ^0.8; | ||
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| // Do not use this contract in production! It's untested and | ||
| // modified for this specific test-suite! It contains insecure | ||
| // functions! | ||
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| contract ERC20 { | ||
| mapping(address => uint256) private _balances; | ||
| mapping(address => mapping(address => uint256)) private _allowances; | ||
| uint256 private _totalSupply; | ||
| string private _name; | ||
| string private _symbol; | ||
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| event Transfer(address indexed from, address indexed to, uint256 value); | ||
| event Approval(address indexed owner, address indexed spender, uint256 value); | ||
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| constructor(string memory name_, string memory symbol_) { | ||
| _name = name_; | ||
| _symbol = symbol_; | ||
| } | ||
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| function name() public view virtual returns (string memory) { | ||
| return _name; | ||
| } | ||
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| function symbol() public view virtual returns (string memory) { | ||
| return _symbol; | ||
| } | ||
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| function decimals() public view virtual returns (uint8) { | ||
| return 18; | ||
| } | ||
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| function totalSupply() public view virtual returns (uint256) { | ||
| return _totalSupply; | ||
| } | ||
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| function balanceOf(address account) public view virtual returns (uint256) { | ||
| return _balances[account]; | ||
| } | ||
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| function transfer(address to, uint256 amount) public virtual returns (bool) { | ||
| address owner = msg.sender; | ||
| _transfer(owner, to, amount); | ||
| return true; | ||
| } | ||
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| function allowance(address owner, address spender) public view virtual returns (uint256) { | ||
| return _allowances[owner][spender]; | ||
| } | ||
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| function approve(address spender, uint256 amount) public virtual returns (bool) { | ||
| address owner = msg.sender; | ||
| _approve(owner, spender, amount); | ||
| return true; | ||
| } | ||
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| function transferFrom(address from, address to, uint256 amount) public virtual returns (bool) { | ||
| address spender = msg.sender; | ||
| _spendAllowance(from, spender, amount); | ||
| _transfer(from, to, amount); | ||
| return true; | ||
| } | ||
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| function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) { | ||
| address owner = msg.sender; | ||
| _approve(owner, spender, allowance(owner, spender) + addedValue); | ||
| return true; | ||
| } | ||
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| function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) { | ||
| address owner = msg.sender; | ||
| uint256 currentAllowance = allowance(owner, spender); | ||
| require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero"); | ||
| unchecked { | ||
| _approve(owner, spender, currentAllowance - subtractedValue); | ||
| } | ||
| return true; | ||
| } | ||
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| function mint(address account, uint256 amount) public virtual returns (bool) { | ||
| require(account != address(0), "ERC20: mint to the zero address"); | ||
| _beforeTokenTransfer(address(0), account, amount); | ||
| _totalSupply += amount; | ||
| unchecked { | ||
| _balances[account] += amount; | ||
| } | ||
| emit Transfer(address(0), account, amount); | ||
| _afterTokenTransfer(address(0), account, amount); | ||
| return true; | ||
| } | ||
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| function burn(address account, uint256 amount) public virtual returns (bool) { | ||
| require(account != address(0), "ERC20: burn from the zero address"); | ||
| _beforeTokenTransfer(account, address(0), amount); | ||
| uint256 accountBalance = _balances[account]; | ||
| require(accountBalance >= amount, "ERC20: burn amount exceeds balance"); | ||
| unchecked { | ||
| _balances[account] = accountBalance - amount; | ||
| _totalSupply -= amount; | ||
| } | ||
| emit Transfer(account, address(0), amount); | ||
| _afterTokenTransfer(account, address(0), amount); | ||
| return true; | ||
| } | ||
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| function _transfer(address from, address to, uint256 amount) internal virtual { | ||
| require(from != address(0), "ERC20: transfer from the zero address"); | ||
| require(to != address(0), "ERC20: transfer to the zero address"); | ||
| _beforeTokenTransfer(from, to, amount); | ||
| uint256 fromBalance = _balances[from]; | ||
| require(fromBalance >= amount, "ERC20: transfer amount exceeds balance"); | ||
| unchecked { | ||
| _balances[from] = fromBalance - amount; | ||
| _balances[to] += amount; | ||
| } | ||
| emit Transfer(from, to, amount); | ||
| _afterTokenTransfer(from, to, amount); | ||
| } | ||
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| function _approve(address owner, address spender, uint256 amount) internal virtual { | ||
| require(owner != address(0), "ERC20: approve from the zero address"); | ||
| require(spender != address(0), "ERC20: approve to the zero address"); | ||
| _allowances[owner][spender] = amount; | ||
| emit Approval(owner, spender, amount); | ||
| } | ||
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| function _spendAllowance(address owner, address spender, uint256 amount) internal virtual { | ||
| uint256 currentAllowance = allowance(owner, spender); | ||
| if (currentAllowance != type(uint256).max) { | ||
| require(currentAllowance >= amount, "ERC20: insufficient allowance"); | ||
| unchecked { | ||
| _approve(owner, spender, currentAllowance - amount); | ||
| } | ||
| } | ||
| } | ||
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| function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual {} | ||
| function _afterTokenTransfer(address from, address to, uint256 amount) internal virtual {} | ||
| } |