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DVIP.sol
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DVIP.sol
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import "lib/Token.sol";
import "lib/TokenRecipient.sol";
import "lib/StateTransferrable.sol";
import "lib/TrustClient.sol";
import "lib/Util.sol";
/**
* @title DVIP Contract. DCAsset Membership Token contract.
*
* @author Ray Pulver, ray@decentralizedcapital.com
*/
contract DVIP is Token, StateTransferrable, TrustClient, Util {
uint256 public totalSupply;
mapping (address => bool) public frozenAccount;
mapping (address => address[]) public allowanceIndex;
mapping (address => mapping (address => bool)) public allowanceActive;
address[] public accountIndex;
mapping (address => bool) public accountActive;
address public oversightAddress;
uint256 public expiry;
uint8 public feeDecimals;
mapping (address => uint256) public validAfter;
uint256 public treasuryBalance;
uint256 public mustHoldFor;
bool public isActive;
mapping (address => uint256) public exportFee;
address[] public exportFeeIndex;
mapping (address => bool) exportFeeActive;
mapping (address => uint256) public importFee;
address[] public importFeeIndex;
mapping (address => bool) importFeeActive;
event FrozenFunds(address target, bool frozen);
event PrecisionSet(address indexed from, uint8 precision);
event TransactionsShutDown(address indexed from);
event FeeSetup(address indexed from, address indexed target, uint256 amount);
/**
* Constructor.
*
*/
function DVIP() {
isActive = true;
treasuryBalance = 0;
totalSupply = 0;
name = "DVIP";
symbol = "DVIP";
decimals = 0;
feeDecimals = 6;
allowTransactions = true;
expiry = 1514764800; //1 jan 2018
mustHoldFor = 86400;
}
/* --------------- modifiers --------------*/
/**
* Makes sure a method is only called by an overseer.
*/
modifier onlyOverseer {
assert(msg.sender == oversightAddress);
_
}
/* --------------- setter methods, only for the unlocked state --------------*/
/**
* Sets the oversight address (not the contract).
*
* @param addr The oversight contract address.
*/
function setOversight(address addr) onlyOwnerUnlocked setter {
oversightAddress = addr;
}
/**
* Sets the total supply
*
* @param total Total supply of the asset.
*/
function setTotalSupply(uint256 total) onlyOwnerUnlocked setter {
totalSupply = total;
}
/**
* Set the Token Standard the contract applies to.
*
* @param std the Standard.
*/
function setStandard(bytes32 std) onlyOwnerUnlocked setter {
standard = std;
}
/**
* Sets the name of the contraxt
*
* @param _name the name.
*/
function setName(bytes32 _name) onlyOwnerUnlocked setter {
name = _name;
}
/**
* Sets the symbol
*
* @param sym The Symbol
*/
function setSymbol(bytes32 sym) onlyOwnerUnlocked setter {
symbol = sym;
}
/**
* Sets the precision
*
* @param precision Amount of decimals
*/
function setPrecisionDirect(uint8 precision) onlyOwnerUnlocked {
decimals = precision;
PrecisionSet(msg.sender, precision);
}
/**
* Sets the balance of a certain account.
*
* @param addr Address of the account
* @param amount Amount of assets to set on the account
*/
function setAccountBalance(address addr, uint256 amount) onlyOwnerUnlocked {
balanceOf[addr] = amount;
activateAccount(addr);
}
/**
* Sets an allowance from a specific account to a specific account.
*
* @param from From-part of the allowance
* @param to To-part of the allowance
* @param amount Amount of the allowance
*/
function setAccountAllowance(address from, address to, uint256 amount) onlyOwnerUnlocked {
allowance[from][to] = amount;
activateAllowanceRecord(from, to);
}
/**
* Sets the treasure balance to a certain account.
*
* @param amount Amount of assets to pre-set in the treasury
*/
function setTreasuryBalance(uint256 amount) onlyOwnerUnlocked {
treasuryBalance = amount;
}
/**
* Sets a certain account on frozen/unfrozen
*
* @param addr Account that will be frozen/unfrozen
* @param frozen Boolean to freeze or unfreeze
*/
function setAccountFrozenStatus(address addr, bool frozen) onlyOwnerUnlocked {
activateAccount(addr);
frozenAccount[addr] = frozen;
}
/**
* Sets up a import fee for a certain address.
*
* @param addr Address that will require fee
* @param fee Amount of fee
*/
function setupImportFee(address addr, uint256 fee) onlyOwnerUnlocked {
importFee[addr] = fee;
activateImportFeeChargeRecord(addr);
FeeSetup(msg.sender, addr, fee);
}
/**
* Sets up a export fee for a certain address.
*
* @param addr Address that will require fee
* @param fee Amount of fee
*/
function setupExportFee(address addr, uint256 fee) onlyOwnerUnlocked {
exportFee[addr] = fee;
activateExportFeeChargeRecord(addr);
FeeSetup(msg.sender, addr, fee);
}
/* --------------- main token methods --------------*/
/**
* @notice Transfer `_amount` from `msg.sender.address()` to `_to`.
*
* @param _to Address that will receive.
* @param _amount Amount to be transferred.
*/
function transfer(address _to, uint256 _amount) returns (bool success) {
assert(allowTransactions);
assert(!frozenAccount[msg.sender]);
assert(balanceOf[msg.sender] >= _amount);
assert(balanceOf[_to] + _amount >= balanceOf[_to]);
activateAccount(msg.sender);
activateAccount(_to);
balanceOf[msg.sender] -= _amount;
uint256 preBalance = balanceOf[_to];
if (_to == address(this)) treasuryBalance += _amount;
else balanceOf[_to] += _amount;
if (preBalance <= 1 && balanceOf[_to] >= 1) {
validAfter[_to] = now + mustHoldFor;
}
Transfer(msg.sender, _to, _amount);
return true;
}
/**
* @notice Transfer `_amount` from `_from` to `_to`.
*
* @param _from Origin address
* @param _to Address that will receive
* @param _amount Amount to be transferred.
* @return result of the method call
*/
function transferFrom(address _from, address _to, uint256 _amount) returns (bool success) {
assert(allowTransactions);
assert(!frozenAccount[msg.sender]);
assert(!frozenAccount[_from]);
assert(balanceOf[_from] >= _amount);
assert(balanceOf[_to] + _amount >= balanceOf[_to]);
assert(_amount <= allowance[_from][msg.sender]);
balanceOf[_from] -= _amount;
uint256 preBalance = balanceOf[_to];
balanceOf[_to] += _amount;
allowance[_from][msg.sender] -= _amount;
if (balanceOf[_to] >= 1 && preBalance <= 1) {
validAfter[_to] = now + mustHoldFor;
}
activateAccount(_from);
activateAccount(_to);
activateAccount(msg.sender);
Transfer(_from, _to, _amount);
return true;
}
/**
* @notice Approve spender `_spender` to transfer `_amount` from `msg.sender.address()`
*
* @param _spender Address that receives the cheque
* @param _amount Amount on the cheque
* @param _extraData Consequential contract to be executed by spender in same transcation.
* @return result of the method call
*/
function approveAndCall(address _spender, uint256 _amount, bytes _extraData) returns (bool success) {
assert(allowTransactions);
assert(!frozenAccount[msg.sender]);
allowance[msg.sender][_spender] = _amount;
activateAccount(msg.sender);
activateAccount(_spender);
activateAllowanceRecord(msg.sender, _spender);
TokenRecipient spender = TokenRecipient(_spender);
spender.receiveApproval(msg.sender, _amount, this, _extraData);
Approval(msg.sender, _spender, _amount);
return true;
}
/**
* @notice Approve spender `_spender` to transfer `_amount` from `msg.sender.address()`
*
* @param _spender Address that receives the cheque
* @param _amount Amount on the cheque
* @return result of the method call
*/
function approve(address _spender, uint256 _amount) returns (bool success) {
assert(allowTransactions);
assert(!frozenAccount[msg.sender]);
allowance[msg.sender][_spender] = _amount;
activateAccount(msg.sender);
activateAccount(_spender);
activateAllowanceRecord(msg.sender, _spender);
Approval(msg.sender, _spender, _amount);
return true;
}
/* --------------- multisig admin methods --------------*/
/**
* @notice Sets the expiry time in milliseconds since 1970.
*
* @param ts milliseconds since 1970.
*
*/
function setExpiry(uint256 ts) multisig(sha3(msg.data)) {
expiry = ts;
}
/**
* @notice Mints `mintedAmount` new tokens to the hotwallet `hotWalletAddress`.
*
* @param mintedAmount Amount of new tokens to be minted.
*/
function mint(uint256 mintedAmount) multisig(sha3(msg.data)) {
treasuryBalance += mintedAmount;
totalSupply += mintedAmount;
}
/**
* @notice Destroys `destroyAmount` new tokens from the hotwallet `hotWalletAddress`
*
* @param destroyAmount Amount of new tokens to be minted.
*/
function destroyTokens(uint256 destroyAmount) multisig(sha3(msg.data)) {
assert(treasuryBalance >= destroyAmount);
treasuryBalance -= destroyAmount;
totalSupply -= destroyAmount;
}
/**
* @notice Transfers `amount` from the treasury to `to`
*
* @param to Address to transfer to
* @param amount Amount to transfer from treasury
*/
function transferFromTreasury(address to, uint256 amount) multisig(sha3(msg.data)) {
assert(treasuryBalance >= amount);
treasuryBalance -= amount;
uint256 preBalance = balanceOf[to];
balanceOf[to] += amount;
if (balanceOf[to] >= 1 && preBalance < 1) {
validAfter[to] = now + mustHoldFor;
}
activateAccount(to);
}
/* --------------- fee setting administration methods --------------*/
/**
* @notice Sets an export fee of `fee` on address `addr`
*
* @param addr Address for which the fee is valid
* @param addr fee Fee
*
*/
function setExportFee(address addr, uint256 fee) multisig(sha3(msg.data)) {
uint256 max = 1;
max = pow10(1, feeDecimals);
assert(fee <= max);
exportFee[addr] = fee;
activateExportFeeChargeRecord(addr);
}
/* --------------- multisig emergency methods --------------*/
/**
* @notice Sets allow transactions to `allow`
*
* @param allow Allow or disallow transactions
*/
function voteAllowTransactions(bool allow) multisig(sha3(msg.data)) {
assert(allow != allowTransactions);
allowTransactions = allow;
}
/**
* @notice Destructs the contract and sends remaining `this.balance` Ether to `beneficiary`
*
* @param beneficiary Beneficiary of remaining Ether on contract
*/
function voteSuicide(address beneficiary) multisig(sha3(msg.data)) {
selfdestruct(beneficiary);
}
/**
* @notice Sets frozen to `freeze` for account `target`
*
* @param addr Address to be frozen/unfrozen
* @param freeze Freeze/unfreeze account
*/
function freezeAccount(address addr, bool freeze) multisig(sha3(msg.data)) {
frozenAccount[addr] = freeze;
activateAccount(addr);
}
/**
* @notice Seizes `seizeAmount` of tokens from `address` and transfers it to hotwallet
*
* @param addr Adress to seize tokens from
* @param amount Amount of tokens to seize
*/
function seizeTokens(address addr, uint256 amount) multisig(sha3(msg.data)) {
assert(balanceOf[addr] >= amount);
assert(frozenAccount[addr]);
activateAccount(addr);
balanceOf[addr] -= amount;
treasuryBalance += amount;
}
function setHoldingPeriod(uint256 ts) multisig(sha3(msg.data)) {
mustHoldFor = ts;
}
/* --------------- fee calculation method ---------------- */
/**
* @notice 'Returns the fee for a transfer from `from` to `to` on an amount `amount`.
*
* Fee's consist of a possible
* - import fee on transfers to an address
* - export fee on transfers from an address
* DVIP ownership on an address
* - reduces fee on a transfer from this address to an import fee-ed address
* - reduces the fee on a transfer to this address from an export fee-ed address
* DVIP discount does not work for addresses that have an import fee or export fee set up against them.
*
* DVIP discount goes up to 100%
*
* @param from From address
* @param to To address
* @param amount Amount for which fee needs to be calculated.
*
*/
function feeFor(address from, address to, uint256 amount) constant external returns (uint256 value) {
uint256 fee = exportFee[from];
if (fee == 0) return 0;
uint256 amountHeld;
bool discounted = true;
uint256 oneDVIPUnit;
if (exportFee[from] == 0 && balanceOf[from] != 0 && now < expiry && validAfter[from] <= now) {
amountHeld = balanceOf[from];
} else if (balanceOf[to] != 0 && now < expiry && validAfter[to] <= now) {
amountHeld = balanceOf[to];
} else discounted = false;
if (discounted) {
oneDVIPUnit = pow10(1, decimals);
if (amountHeld > oneDVIPUnit) amountHeld = oneDVIPUnit;
uint256 remaining = oneDVIPUnit - amountHeld;
return div10(amount*fee*remaining, feeDecimals + decimals);
}
return div10(amount*fee, feeDecimals);
}
/* --------------- overseer methods for emergency --------------*/
/**
* @notice Shuts down all transaction and approval options on the asset contract
*/
function shutdownTransactions() onlyOverseer {
allowTransactions = false;
TransactionsShutDown(msg.sender);
}
/* --------------- helper methods for siphoning --------------*/
function extractAccountAllowanceRecordLength(address addr) constant returns (uint256 len) {
return allowanceIndex[addr].length;
}
function extractAccountLength() constant returns (uint256 length) {
return accountIndex.length;
}
/* --------------- private methods --------------*/
function activateAccount(address addr) internal {
if (!accountActive[addr]) {
accountActive[addr] = true;
accountIndex.push(addr);
}
}
function activateAllowanceRecord(address from, address to) internal {
if (!allowanceActive[from][to]) {
allowanceActive[from][to] = true;
allowanceIndex[from].push(to);
}
}
function activateExportFeeChargeRecord(address addr) internal {
if (!exportFeeActive[addr]) {
exportFeeActive[addr] = true;
exportFeeIndex.push(addr);
}
}
function activateImportFeeChargeRecord(address addr) internal {
if (!importFeeActive[addr]) {
importFeeActive[addr] = true;
importFeeIndex.push(addr);
}
}
function extractImportFeeChargeLength() returns (uint256 length) {
return importFeeIndex.length;
}
function extractExportFeeChargeLength() returns (uint256 length) {
return exportFeeIndex.length;
}
}