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November 2, 2017 21:55
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DaRenta ICO solidity smart contract
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pragma solidity ^0.4.16; | |
/* | |
* Abstract Token Smart Contract. | |
* Author: Mikhail Vladimirov <mikhail.vladimirov@gmail.com> | |
*/ | |
pragma solidity ^0.4.16; | |
/* | |
* ERC-20 Standard Token Smart Contract Interface. | |
* Author: Mikhail Vladimirov <mikhail.vladimirov@gmail.com> | |
*/ | |
pragma solidity ^0.4.16; | |
/** | |
* ERC-20 standard token interface, as defined | |
* <a href="http://github.com/ethereum/EIPs/issues/20">here</a>. | |
*/ | |
contract Token { | |
/** | |
* Get total number of tokens in circulation. | |
* | |
* @return total number of tokens in circulation | |
*/ | |
function totalSupply () constant returns (uint256 supply); | |
/** | |
* Get number of tokens currently belonging to given owner. | |
* | |
* @param _owner address to get number of tokens currently belonging to the | |
* owner of | |
* @return number of tokens currently belonging to the owner of given address | |
*/ | |
function balanceOf (address _owner) constant returns (uint256 balance); | |
/** | |
* Transfer given number of tokens from message sender to given recipient. | |
* | |
* @param _to address to transfer tokens to the owner of | |
* @param _value number of tokens to transfer to the owner of given address | |
* @return true if tokens were transferred successfully, false otherwise | |
*/ | |
function transfer (address _to, uint256 _value) returns (bool success); | |
/** | |
* Transfer given number of tokens from given owner to given recipient. | |
* | |
* @param _from address to transfer tokens from the owner of | |
* @param _to address to transfer tokens to the owner of | |
* @param _value number of tokens to transfer from given owner to given | |
* recipient | |
* @return true if tokens were transferred successfully, false otherwise | |
*/ | |
function transferFrom (address _from, address _to, uint256 _value) | |
returns (bool success); | |
/** | |
* Allow given spender to transfer given number of tokens from message sender. | |
* | |
* @param _spender address to allow the owner of to transfer tokens from | |
* message sender | |
* @param _value number of tokens to allow to transfer | |
* @return true if token transfer was successfully approved, false otherwise | |
*/ | |
function approve (address _spender, uint256 _value) returns (bool success); | |
/** | |
* Tell how many tokens given spender is currently allowed to transfer from | |
* given owner. | |
* | |
* @param _owner address to get number of tokens allowed to be transferred | |
* from the owner of | |
* @param _spender address to get number of tokens allowed to be transferred | |
* by the owner of | |
* @return number of tokens given spender is currently allowed to transfer | |
* from given owner | |
*/ | |
function allowance (address _owner, address _spender) constant | |
returns (uint256 remaining); | |
/** | |
* Logged when tokens were transferred from one owner to another. | |
* | |
* @param _from address of the owner, tokens were transferred from | |
* @param _to address of the owner, tokens were transferred to | |
* @param _value number of tokens transferred | |
*/ | |
event Transfer (address indexed _from, address indexed _to, uint256 _value); | |
/** | |
* Logged when owner approved his tokens to be transferred by some spender. | |
* | |
* @param _owner owner who approved his tokens to be transferred | |
* @param _spender spender who were allowed to transfer the tokens belonging | |
* to the owner | |
* @param _value number of tokens belonging to the owner, approved to be | |
* transferred by the spender | |
*/ | |
event Approval ( | |
address indexed _owner, address indexed _spender, uint256 _value); | |
} | |
/* | |
* Safe Math Smart Contract. | |
* Author: Mikhail Vladimirov <mikhail.vladimirov@gmail.com> | |
*/ | |
pragma solidity ^0.4.16; | |
/** | |
* Provides methods to safely add, subtract and multiply uint256 numbers. | |
*/ | |
contract SafeMath { | |
uint256 constant private MAX_UINT256 = | |
0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF; | |
/** | |
* Add two uint256 values, throw in case of overflow. | |
* | |
* @param x first value to add | |
* @param y second value to add | |
* @return x + y | |
*/ | |
function safeAdd (uint256 x, uint256 y) | |
constant internal | |
returns (uint256 z) { | |
assert (x <= MAX_UINT256 - y); | |
return x + y; | |
} | |
/** | |
* Subtract one uint256 value from another, throw in case of underflow. | |
* | |
* @param x value to subtract from | |
* @param y value to subtract | |
* @return x - y | |
*/ | |
function safeSub (uint256 x, uint256 y) | |
constant internal | |
returns (uint256 z) { | |
assert (x >= y); | |
return x - y; | |
} | |
/** | |
* Multiply two uint256 values, throw in case of overflow. | |
* | |
* @param x first value to multiply | |
* @param y second value to multiply | |
* @return x * y | |
*/ | |
function safeMul (uint256 x, uint256 y) | |
constant internal | |
returns (uint256 z) { | |
if (y == 0) return 0; // Prevent division by zero at the next line | |
assert (x <= MAX_UINT256 / y); | |
return x * y; | |
} | |
} | |
/** | |
* Abstract Token Smart Contract that could be used as a base contract for | |
* ERC-20 token contracts. | |
*/ | |
contract AbstractToken is Token, SafeMath { | |
/** | |
* Create new Abstract Token contract. | |
*/ | |
function AbstractToken () { | |
// Do nothing | |
} | |
/** | |
* Get number of tokens currently belonging to given owner. | |
* | |
* @param _owner address to get number of tokens currently belonging to the | |
* owner of | |
* @return number of tokens currently belonging to the owner of given address | |
*/ | |
function balanceOf (address _owner) constant returns (uint256 balance) { | |
return accounts [_owner]; | |
} | |
/** | |
* Transfer given number of tokens from message sender to given recipient. | |
* | |
* @param _to address to transfer tokens to the owner of | |
* @param _value number of tokens to transfer to the owner of given address | |
* @return true if tokens were transferred successfully, false otherwise | |
*/ | |
function transfer (address _to, uint256 _value) returns (bool success) { | |
if (accounts [msg.sender] < _value) return false; | |
if (_value > 0 && msg.sender != _to) { | |
accounts [msg.sender] = safeSub (accounts [msg.sender], _value); | |
accounts [_to] = safeAdd (accounts [_to], _value); | |
} | |
Transfer (msg.sender, _to, _value); | |
return true; | |
} | |
/** | |
* Transfer given number of tokens from given owner to given recipient. | |
* | |
* @param _from address to transfer tokens from the owner of | |
* @param _to address to transfer tokens to the owner of | |
* @param _value number of tokens to transfer from given owner to given | |
* recipient | |
* @return true if tokens were transferred successfully, false otherwise | |
*/ | |
function transferFrom (address _from, address _to, uint256 _value) | |
returns (bool success) { | |
if (allowances [_from][msg.sender] < _value) return false; | |
if (accounts [_from] < _value) return false; | |
allowances [_from][msg.sender] = | |
safeSub (allowances [_from][msg.sender], _value); | |
if (_value > 0 && _from != _to) { | |
accounts [_from] = safeSub (accounts [_from], _value); | |
accounts [_to] = safeAdd (accounts [_to], _value); | |
} | |
Transfer (_from, _to, _value); | |
return true; | |
} | |
/** | |
* Allow given spender to transfer given number of tokens from message sender. | |
* | |
* @param _spender address to allow the owner of to transfer tokens from | |
* message sender | |
* @param _value number of tokens to allow to transfer | |
* @return true if token transfer was successfully approved, false otherwise | |
*/ | |
function approve (address _spender, uint256 _value) returns (bool success) { | |
allowances [msg.sender][_spender] = _value; | |
Approval (msg.sender, _spender, _value); | |
return true; | |
} | |
/** | |
* Tell how many tokens given spender is currently allowed to transfer from | |
* given owner. | |
* | |
* @param _owner address to get number of tokens allowed to be transferred | |
* from the owner of | |
* @param _spender address to get number of tokens allowed to be transferred | |
* by the owner of | |
* @return number of tokens given spender is currently allowed to transfer | |
* from given owner | |
*/ | |
function allowance (address _owner, address _spender) constant | |
returns (uint256 remaining) { | |
return allowances [_owner][_spender]; | |
} | |
/** | |
* Mapping from addresses of token holders to the numbers of tokens belonging | |
* to these token holders. | |
*/ | |
mapping (address => uint256) accounts; | |
/** | |
* Mapping from addresses of token holders to the mapping of addresses of | |
* spenders to the allowances set by these token holders to these spenders. | |
*/ | |
mapping (address => mapping (address => uint256)) private allowances; | |
} | |
/** | |
* Darenta token smart contract. | |
*/ | |
contract ProducToken is AbstractToken { | |
/** | |
* Address of the owner of this smart contract. | |
*/ | |
address private owner; | |
/** | |
* Total number of tokens in circulation. | |
*/ | |
uint256 tokenCount; | |
/** | |
* True if tokens transfers are currently frozen, false otherwise. | |
*/ | |
bool frozen = false; | |
/** | |
* Create new Darenta token smart contract, with given number of tokens issued | |
* and given to msg.sender, and make msg.sender the owner of this smart | |
* contract. | |
* | |
* @param _tokenCount number of tokens to issue and give to msg.sender | |
*/ | |
function ProducToken (uint256 _tokenCount) { | |
owner = msg.sender; | |
tokenCount = _tokenCount; | |
accounts [msg.sender] = _tokenCount; | |
} | |
/** | |
* Get total number of tokens in circulation. | |
* | |
* @return total number of tokens in circulation | |
*/ | |
function totalSupply () constant returns (uint256 supply) { | |
return tokenCount; | |
} | |
/** | |
* Get name of this token. | |
* | |
* @return name of this token | |
*/ | |
function name () constant returns (string result) { | |
return "ProducToken"; | |
} | |
/** | |
* Get symbol of this token. | |
* | |
* @return symbol of this token | |
*/ | |
function symbol () constant returns (string result) { | |
return "PROD"; | |
} | |
/** | |
* Get number of decimals for this token. | |
* | |
* @return number of decimals for this token | |
*/ | |
function decimals () constant returns (uint8 result) { | |
return 10; | |
} | |
/** | |
* Transfer given number of tokens from message sender to given recipient. | |
* | |
* @param _to address to transfer tokens to the owner of | |
* @param _value number of tokens to transfer to the owner of given address | |
* @return true if tokens were transferred successfully, false otherwise | |
*/ | |
function transfer (address _to, uint256 _value) returns (bool success) { | |
if (frozen) return false; | |
else return AbstractToken.transfer (_to, _value); | |
} | |
/** | |
* Transfer given number of tokens from given owner to given recipient. | |
* | |
* @param _from address to transfer tokens from the owner of | |
* @param _to address to transfer tokens to the owner of | |
* @param _value number of tokens to transfer from given owner to given | |
* recipient | |
* @return true if tokens were transferred successfully, false otherwise | |
*/ | |
function transferFrom (address _from, address _to, uint256 _value) | |
returns (bool success) { | |
if (frozen) return false; | |
else return AbstractToken.transferFrom (_from, _to, _value); | |
} | |
/** | |
* Change how many tokens given spender is allowed to transfer from message | |
* spender. In order to prevent double spending of allowance, this method | |
* receives assumed current allowance value as an argument. If actual | |
* allowance differs from an assumed one, this method just returns false. | |
* | |
* @param _spender address to allow the owner of to transfer tokens from | |
* message sender | |
* @param _currentValue assumed number of tokens currently allowed to be | |
* transferred | |
* @param _newValue number of tokens to allow to transfer | |
* @return true if token transfer was successfully approved, false otherwise | |
*/ | |
function approve (address _spender, uint256 _currentValue, uint256 _newValue) | |
returns (bool success) { | |
if (allowance (msg.sender, _spender) == _currentValue) | |
return approve (_spender, _newValue); | |
else return false; | |
} | |
/** | |
* Freeze token transfers. | |
* May only be called by smart contract owner. | |
*/ | |
function freezeTransfers () { | |
require (msg.sender == owner); | |
if (!frozen) { | |
frozen = true; | |
Freeze (); | |
} | |
} | |
/** | |
* Unfreeze token transfers. | |
* May only be called by smart contract owner. | |
*/ | |
function unfreezeTransfers () { | |
require (msg.sender == owner); | |
if (frozen) { | |
frozen = false; | |
Unfreeze (); | |
} | |
} | |
/** | |
* Logged when token transfers were frozen. | |
*/ | |
event Freeze (); | |
/** | |
* Logged when token transfers were unfrozen. | |
*/ | |
event Unfreeze (); | |
} |
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