{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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}
],
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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once to change the allowance to 0 and secondly to change it to the new allowance value\",\"params\":{\"_spender\":\"approved address\",\"_value\":\"allowance amount\"},\"returns\":{\"_0\":\"true if the approval was successful, false if it wasn't\"}},\"constructor\":{\"details\":\"initializes a new ERC20Token instance\",\"params\":{\"_decimals\":\"decimal points, for display purposes\",\"_name\":\"token name\",\"_symbol\":\"token symbol\",\"_totalSupply\":\"total supply of token units\"}},\"transfer(address,uint256)\":{\"details\":\"transfers tokens to a given address throws on any error rather then return a false flag to minimize user errors\",\"params\":{\"_to\":\"target address\",\"_value\":\"transfer amount\"},\"returns\":{\"_0\":\"true if the transfer was successful, false if it wasn't\"}},\"transferFrom(address,address,uint256)\":{\"details\":\"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\",\"params\":{\"_from\":\"source address\",\"_to\":\"target address\",\"_value\":\"transfer amount\"},\"returns\":{\"_0\":\"true if the transfer was successful, false if it wasn't\"}}},\"version\":1},\"userdoc\":{\"kind\":\"user\",\"methods\":{},\"version\":1}},\"settings\":{\"compilationTarget\":{\"/home/lash/src/ext/cic/grassrootseconomics/bancor-contracts/solidity/contracts/token/ERC20Token.sol\":\"ERC20Token\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"metadata\":{\"bytecodeHash\":\"ipfs\"},\"optimizer\":{\"enabled\":true,\"runs\":200},\"remappings\":[]},\"sources\":{\"/home/lash/src/ext/cic/grassrootseconomics/bancor-contracts/solidity/contracts/token/ERC20Token.sol\":{\"keccak256\":\"0xf64a993754bb4afcdfda9e8fe377c2c8a198f23b39e954f5ee3f9f2825958ebd\",\"license\":\"SEE LICENSE IN LICENSE\",\"urls\":[\"bzz-raw://9ee0b7fd792a589b8321f1f13686fe5d5ae949288b124c1a57e2ad895c87e915\",\"dweb:/ipfs/QmTCRx2G6rJAhX9FyYkV4Gx69owVDYSkjNGNFrJGQ7Xnik\"]},\"/home/lash/src/ext/cic/grassrootseconomics/bancor-contracts/solidity/contracts/token/interfaces/IERC20Token.sol\":{\"keccak256\":\"0xe6f988c3156e88258474526a541d5a42b6a9adae98b04177a059d9f723bc82cd\",\"license\":\"SEE LICENSE IN LICENSE\",\"urls\":[\"bzz-raw://9a6eb77a5b9ce70995a11a6e48ac3985a4c70896fe5fe04d46146ad7c1c83ea3\",\"dweb:/ipfs/QmYvGSveZFG51tghwkVuu6eK9Jy8frHpfLxHTMyvNZN461\"]},\"/home/lash/src/ext/cic/grassrootseconomics/bancor-contracts/solidity/contracts/utility/SafeMath.sol\":{\"keccak256\":\"0x1ab7391a19ca8a3ad2f3c4a1074e080d4d76dfdb834637bdd0c1e6b6acdf28af\",\"license\":\"SEE LICENSE IN LICENSE\",\"urls\":[\"bzz-raw://d6d8c99621ca884b72da2d84eddfec8ec8c5533915691d6eec94a07adf445608\",\"dweb:/ipfs/QmaXr6DN7VbfxfMn3PsTy7SAMgZVVXbdeaw11BsAjVL2x1\"]},\"/home/lash/src/ext/cic/grassrootseconomics/bancor-contracts/solidity/contracts/utility/Utils.sol\":{\"keccak256\":\"0x073efa69fcd6b5e60f841b28b366d63b62ff48ab12a06ce3f5a7f41afd6ce885\",\"license\":\"SEE LICENSE IN LICENSE\",\"urls\":[\"bzz-raw://e8b8ecb2d29197ca77f0ed98f728ace54e6edcfdf5cd1194ae22701607eaf608\",\"dweb:/ipfs/QmcsR6Q35Hurh3TrPkYAboicz9bQQoGCWmZLzUCDyhotH8\"]}},\"version\":1}",
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"source": "// SPDX-License-Identifier: SEE LICENSE IN LICENSE\r\npragma solidity 0.6.12;\r\nimport \"./interfaces/IERC20Token.sol\";\r\nimport \"../utility/Utils.sol\";\r\nimport \"../utility/SafeMath.sol\";\r\n\r\n/**\r\n * @dev ERC20 Standard Token implementation\r\n*/\r\ncontract ERC20Token is IERC20Token, Utils {\r\n using SafeMath for uint256;\r\n\r\n\r\n string public override name;\r\n string public override symbol;\r\n uint8 public override decimals;\r\n uint256 public override totalSupply;\r\n mapping (address => uint256) public override balanceOf;\r\n mapping (address => mapping (address => uint256)) public override allowance;\r\n\r\n /**\r\n * @dev triggered when tokens are transferred between wallets\r\n *\r\n * @param _from source address\r\n * @param _to target address\r\n * @param _value transfer amount\r\n */\r\n event Transfer(address indexed _from, address indexed _to, uint256 _value);\r\n\r\n /**\r\n * @dev triggered when a wallet allows another wallet to transfer tokens from on its behalf\r\n *\r\n * @param _owner wallet that approves the allowance\r\n * @param _spender wallet that receives the allowance\r\n * @param _value allowance amount\r\n */\r\n event Approval(address indexed _owner, address indexed _spender, uint256 _value);\r\n\r\n /**\r\n * @dev initializes a new ERC20Token instance\r\n *\r\n * @param _name token name\r\n * @param _symbol token symbol\r\n * @param _decimals decimal points, for display purposes\r\n * @param _totalSupply total supply of token units\r\n */\r\n constructor(string memory _name, string memory _symbol, uint8 _decimals, uint256 _totalSupply) public {\r\n // validate input\r\n require(bytes(_name).length > 0, \"ERR_INVALID_NAME\");\r\n require(bytes(_symbol).length > 0, \"ERR_INVALID_SYMBOL\");\r\n\r\n name = _name;\r\n symbol = _symbol;\r\n decimals = _decimals;\r\n totalSupply = _totalSupply;\r\n balanceOf[msg.sender] = _totalSupply;\r\n }\r\n\r\n /**\r\n * @dev transfers tokens to a given address\r\n * throws on any error rather then return a false flag to minimize user errors\r\n *\r\n * @param _to target address\r\n * @param _value transfer amount\r\n *\r\n * @return true if the transfer was successful, false if it wasn't\r\n */\r\n function transfer(address _to, uint256 _value)\r\n public\r\n virtual\r\n override\r\n validAddress(_to)\r\n returns (bool)\r\n {\r\n balanceOf[msg.sender] = balanceOf[msg.sender].sub(_value);\r\n balanceOf[_to] = balanceOf[_to].add(_value);\r\n emit Transfer(msg.sender, _to, _value);\r\n return true;\r\n }\r\n\r\n /**\r\n * @dev transfers tokens to a given address on behalf of another address\r\n * throws on any error rather then return a false flag to minimize user errors\r\n *\r\n * @param _from source address\r\n * @param _to target address\r\n * @param _value transfer amount\r\n *\r\n * @return true if the transfer was successful, false if it wasn't\r\n */\r\n function transferFrom(address _from, address _to, uint256 _value)\r\n public\r\n virtual\r\n override\r\n validAddress(_from)\r\n validAddress(_to)\r\n returns (bool)\r\n {\r\n allowance[_from][msg.sender] = allowance[_from][msg.sender].sub(_value);\r\n balanceOf[_from] = balanceOf[_from].sub(_value);\r\n balanceOf[_to] = balanceOf[_to].add(_value);\r\n emit Transfer(_from, _to, _value);\r\n return true;\r\n }\r\n\r\n /**\r\n * @dev allows another account/contract to transfers tokens on behalf of the caller\r\n * throws on any error rather then return a false flag to minimize user errors\r\n *\r\n * also, to minimize the risk of the approve/transferFrom attack vector\r\n * (see https://docs.google.com/document/d/1YLPtQxZu1UAvO9cZ1O2RPXBbT0mooh4DYKjA_jp-RLM/), approve has to be called twice\r\n * in 2 separate transactions - once to change the allowance to 0 and secondly to change it to the new allowance value\r\n *\r\n * @param _spender approved address\r\n * @param _value allowance amount\r\n *\r\n * @return true if the approval was successful, false if it wasn't\r\n */\r\n function approve(address _spender, uint256 _value)\r\n public\r\n virtual\r\n override\r\n validAddress(_spender)\r\n returns (bool)\r\n {\r\n // if the allowance isn't 0, it can only be updated to 0 to prevent an allowance change immediately after withdrawal\r\n require(_value == 0 || allowance[msg.sender][_spender] == 0, \"ERR_INVALID_AMOUNT\");\r\n\r\n allowance[msg.sender][_spender] = _value;\r\n emit Approval(msg.sender, _spender, _value);\r\n return true;\r\n }\r\n}\r\n",
"sourcePath": "/home/lash/src/ext/cic/grassrootseconomics/bancor-contracts/solidity/contracts/token/ERC20Token.sol",
"ast": {
"absolutePath": "/home/lash/src/ext/cic/grassrootseconomics/bancor-contracts/solidity/contracts/token/ERC20Token.sol",
"exportedSymbols": {
"ERC20Token": [
20617
]
},
"id": 20618,
"license": "SEE LICENSE IN LICENSE",
"nodeType": "SourceUnit",
"nodes": [
{
"id": 20341,
"literals": [
"solidity",
"0.6",
".12"
],
"nodeType": "PragmaDirective",
"src": "52:23:48"
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}
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}
},
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}
},
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},
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}