@valueswap/v2-periphery
Version:
🎚 Peripheral smart contracts for interacting with Valueswap V2
828 lines (827 loc) • 550 kB
JSON
{
"contractName": "DeflatingERC20",
"abi": [
{
"inputs": [
{
"internalType": "uint256",
"name": "_totalSupply",
"type": "uint256"
}
],
"stateMutability": "nonpayable",
"type": "constructor"
},
{
"anonymous": false,
"inputs": [
{
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"internalType": "address",
"name": "owner",
"type": "address"
},
{
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"name": "spender",
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},
{
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"internalType": "uint256",
"name": "value",
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}
],
"name": "Approval",
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},
{
"anonymous": false,
"inputs": [
{
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"internalType": "address",
"name": "from",
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{
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"internalType": "address",
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{
"indexed": false,
"internalType": "uint256",
"name": "value",
"type": "uint256"
}
],
"name": "Transfer",
"type": "event"
},
{
"inputs": [],
"name": "DOMAIN_SEPARATOR",
"outputs": [
{
"internalType": "bytes32",
"name": "",
"type": "bytes32"
}
],
"stateMutability": "view",
"type": "function"
},
{
"inputs": [],
"name": "PERMIT_TYPEHASH",
"outputs": [
{
"internalType": "bytes32",
"name": "",
"type": "bytes32"
}
],
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},
{
"inputs": [
{
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"name": "",
"type": "address"
},
{
"internalType": "address",
"name": "",
"type": "address"
}
],
"name": "allowance",
"outputs": [
{
"internalType": "uint256",
"name": "",
"type": "uint256"
}
],
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},
{
"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": [],
"name": "name",
"outputs": [
{
"internalType": "string",
"name": "",
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}
],
"stateMutability": "view",
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},
{
"inputs": [
{
"internalType": "address",
"name": "",
"type": "address"
}
],
"name": "nonces",
"outputs": [
{
"internalType": "uint256",
"name": "",
"type": "uint256"
}
],
"stateMutability": "view",
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},
{
"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": "spender",
"type": "address"
},
{
"internalType": "uint256",
"name": "value",
"type": "uint256"
}
],
"name": "approve",
"outputs": [
{
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"name": "",
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}
],
"stateMutability": "nonpayable",
"type": "function"
},
{
"inputs": [
{
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"name": "to",
"type": "address"
},
{
"internalType": "uint256",
"name": "value",
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}
],
"name": "transfer",
"outputs": [
{
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"name": "",
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}
],
"stateMutability": "nonpayable",
"type": "function"
},
{
"inputs": [
{
"internalType": "address",
"name": "from",
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},
{
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"name": "to",
"type": "address"
},
{
"internalType": "uint256",
"name": "value",
"type": "uint256"
}
],
"name": "transferFrom",
"outputs": [
{
"internalType": "bool",
"name": "",
"type": "bool"
}
],
"stateMutability": "nonpayable",
"type": "function"
},
{
"inputs": [
{
"internalType": "address",
"name": "owner",
"type": "address"
},
{
"internalType": "address",
"name": "spender",
"type": "address"
},
{
"internalType": "uint256",
"name": "value",
"type": "uint256"
},
{
"internalType": "uint256",
"name": "deadline",
"type": "uint256"
},
{
"internalType": "uint8",
"name": "v",
"type": "uint8"
},
{
"internalType": "bytes32",
"name": "r",
"type": "bytes32"
},
{
"internalType": "bytes32",
"name": "s",
"type": "bytes32"
}
],
"name": "permit",
"outputs": [],
"stateMutability": "nonpayable",
"type": "function"
}
],
"metadata": 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"source": "pragma solidity =0.6.6;\n\nimport '../libraries/SafeMath.sol';\n\ncontract DeflatingERC20 {\n using SafeMath for uint;\n\n string public constant name = 'Deflating Test Token';\n string public constant symbol = 'DTT';\n uint8 public constant decimals = 18;\n uint public totalSupply;\n mapping(address => uint) public balanceOf;\n mapping(address => mapping(address => uint)) public allowance;\n\n bytes32 public DOMAIN_SEPARATOR;\n // keccak256(\"Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)\");\n bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;\n mapping(address => uint) public nonces;\n\n event Approval(address indexed owner, address indexed spender, uint value);\n event Transfer(address indexed from, address indexed to, uint value);\n\n constructor(uint _totalSupply) public {\n uint chainId;\n assembly {\n chainId := chainid()\n }\n DOMAIN_SEPARATOR = keccak256(\n abi.encode(\n keccak256('EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)'),\n keccak256(bytes(name)),\n keccak256(bytes('1')),\n chainId,\n address(this)\n )\n );\n _mint(msg.sender, _totalSupply);\n }\n\n function _mint(address to, uint value) internal {\n totalSupply = totalSupply.add(value);\n balanceOf[to] = balanceOf[to].add(value);\n emit Transfer(address(0), to, value);\n }\n\n function _burn(address from, uint value) internal {\n balanceOf[from] = balanceOf[from].sub(value);\n totalSupply = totalSupply.sub(value);\n emit Transfer(from, address(0), value);\n }\n\n function _approve(address owner, address spender, uint value) private {\n allowance[owner][spender] = value;\n emit Approval(owner, spender, value);\n }\n\n function _transfer(address from, address to, uint value) private {\n uint burnAmount = value / 100;\n _burn(from, burnAmount);\n uint transferAmount = value.sub(burnAmount);\n balanceOf[from] = balanceOf[from].sub(transferAmount);\n balanceOf[to] = balanceOf[to].add(transferAmount);\n emit Transfer(from, to, transferAmount);\n }\n\n function approve(address spender, uint value) external returns (bool) {\n _approve(msg.sender, spender, value);\n return true;\n }\n\n function transfer(address to, uint value) external returns (bool) {\n _transfer(msg.sender, to, value);\n return true;\n }\n\n function transferFrom(address from, address to, uint value) external returns (bool) {\n if (allowance[from][msg.sender] != uint(-1)) {\n allowance[from][msg.sender] = allowance[from][msg.sender].sub(value);\n }\n _transfer(from, to, value);\n return true;\n }\n\n function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external {\n require(deadline >= block.timestamp, 'EXPIRED');\n bytes32 digest = keccak256(\n abi.encodePacked(\n '\\x19\\x01',\n DOMAIN_SEPARATOR,\n keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline))\n )\n );\n address recoveredAddress = ecrecover(digest, v, r, s);\n require(recoveredAddress != address(0) && recoveredAddress == owner, 'INVALID_SIGNATURE');\n _approve(owner, spender, value);\n }\n}\n",
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