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FairReceipter.sol
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FairReceipter.sol
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//! Receipting contract. Just records who sent what.
//! By Parity Technologies, 2017.
//! Released under the Apache Licence 2.
pragma solidity ^0.4.7;
contract Certifier {
event Confirmed(address indexed who);
event Revoked(address indexed who);
function certified(address _who) constant returns (bool);
function getData(address _who, string _field) constant returns (bytes32) {}
function getAddress(address _who, string _field) constant returns (address) {}
function getUint(address _who, string _field) constant returns (uint) {}
}
contract Recorder {
function received(address _who, uint _value);
}
// ECR20 standard token interface
contract Token {
event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(address indexed owner, address indexed spender, uint256 value);
function balanceOf(address _owner) constant returns (uint256 balance);
function transfer(address _to, uint256 _value) returns (bool success);
function transferFrom(address _from, address _to, uint256 _value) returns (bool success);
function approve(address _spender, uint256 _value) returns (bool success);
function allowance(address _owner, address _spender) constant returns (uint256 remaining);
}
// Owner-specific contract interface
contract Owned {
event NewOwner(address indexed old, address indexed current);
modifier only_owner {
if (msg.sender != owner) throw;
_;
}
address public owner = msg.sender;
function setOwner(address _new) only_owner {
NewOwner(owner, _new);
owner = _new;
}
}
// BasicCoin, ECR20 tokens that all belong to the owner for sending around
contract BasicToken is Token {
// this is as basic as can be, only the associated balance & allowances
struct Account {
uint balance;
mapping (address => uint) allowanceOf;
}
// constructor sets the parameters of execution, _totalSupply is all units
function BasicToken(uint _totalSupply) when_no_eth when_non_zero(_totalSupply) {
totalSupply = _totalSupply;
accounts[msg.sender].balance = totalSupply;
}
// balance of a specific address
function balanceOf(address _who) constant returns (uint256) {
return accounts[_who].balance;
}
// transfer
function transfer(address _to, uint256 _value) when_no_eth when_owns(msg.sender, _value) returns (bool) {
Transfer(msg.sender, _to, _value);
accounts[msg.sender].balance -= _value;
accounts[_to].balance += _value;
return true;
}
// transfer via allowance
function transferFrom(address _from, address _to, uint256 _value) when_no_eth when_owns(_from, _value) when_has_allowance(_from, msg.sender, _value) returns (bool) {
Transfer(_from, _to, _value);
accounts[_from].allowanceOf[msg.sender] -= _value;
accounts[_from].balance -= _value;
accounts[_to].balance += _value;
return true;
}
// approve allowances
function approve(address _spender, uint256 _value) when_no_eth returns (bool) {
Approval(msg.sender, _spender, _value);
accounts[msg.sender].allowanceOf[_spender] += _value;
return true;
}
// available allowance
function allowance(address _owner, address _spender) constant returns (uint256) {
return accounts[_owner].allowanceOf[_spender];
}
// no default function, simple contract only, entry-level users
function() {
throw;
}
// the balance should be available
modifier when_owns(address _owner, uint _amount) {
if (accounts[_owner].balance < _amount) throw;
_;
}
// an allowance should be available
modifier when_has_allowance(address _owner, address _spender, uint _amount) {
if (accounts[_owner].allowanceOf[_spender] < _amount) throw;
_;
}
// no ETH should be sent with the transaction
modifier when_no_eth {
if (msg.value > 0) throw;
_;
}
// a value should be > 0
modifier when_non_zero(uint _value) {
if (_value == 0) throw;
_;
}
// the base, tokens denoted in micros
uint constant public base = 1000000;
// available token supply
uint public totalSupply;
// storage and mapping of all balances & allowances
mapping (address => Account) accounts;
}
contract BasicMintableToken is Owned, BasicToken, Recorder {
event Minted(address indexed who, uint value);
function BasicMintableToken(address _owner) {
owner = _owner;
}
function received(address _who, uint _value) { mint(_who, _value); }
function mint(address _who, uint _value) {
accounts[_who].balance += _value;
totalSupply += _value;
Minted(_who, _value);
}
}
/// Will accept Ether "contributions" and record each both as a log and in a
/// queryable record.
contract Receipter {
/// Constructor. `_admin` has the ability to pause the
/// contribution period and, eventually, kill this contract. `_treasury`
/// receives all funds. `_beginTime` and `_endTime` define the begin and
/// end of the period.
function Receipter(address _recorder, address _admin, address _treasury, uint _beginTime, uint _endTime) {
recorder = Recorder(_recorder);
admin = _admin;
treasury = _treasury;
beginTime = _beginTime;
endTime = _endTime;
}
// Can only be called by _admin.
modifier only_admin { if (msg.sender != admin) throw; _; }
// Can only be called by prior to the period.
modifier only_before_period { if (now >= beginTime) throw; _; }
// Only does something if during the period.
modifier when_during_period { if (now >= beginTime && now < endTime && !isHalted) _; }
// Can only be called during the period when not halted.
modifier only_during_period { if (now < beginTime || now >= endTime || isHalted) throw; _; }
// Can only be called during the period when halted.
modifier only_during_halted_period { if (now < beginTime || now >= endTime || !isHalted) throw; _; }
// Can only be called after the period.
modifier only_after_period { if (now < endTime || isHalted) throw; _; }
// The value of the message must be sufficiently large to not be considered dust.
modifier is_not_dust { if (msg.value < dust) throw; _; }
/// Some contribution `amount` received from `recipient`.
event Received(address indexed recipient, uint amount);
/// Period halted abnormally.
event Halted();
/// Period restarted after abnormal halt.
event Unhalted();
/// Fallback function: receive a contribution from sender.
function() payable {
processReceipt(msg.sender);
}
/// Receive a contribution from sender.
function receive() payable returns (bool) {
return processReceipt(msg.sender);
}
/// Receive a contribution from `_recipient`.
function receiveFrom(address _recipient) payable returns (bool) {
return processReceipt(_recipient);
}
/// Receive a contribution from `_recipient`.
function processReceipt(address _recipient)
only_during_period
is_not_dust
internal
returns (bool)
{
if (!treasury.call.value(msg.value)()) throw;
recorder.received(_recipient, msg.value);
total += msg.value;
Received(_recipient, msg.value);
return true;
}
/// Halt the contribution period. Any attempt at contributing will fail.
function halt() only_admin only_during_period {
isHalted = true;
Halted();
}
/// Unhalt the contribution period.
function unhalt() only_admin only_during_halted_period {
isHalted = false;
Unhalted();
}
/// Kill this contract.
function kill() only_admin only_after_period {
suicide(treasury);
}
// How much is enough?
uint public constant dust = 100 finney;
// The contract which gets called whenever anything is received.
Recorder public recorder;
// Who can halt/unhalt/kill?
address public admin;
// Who gets the stash?
address public treasury;
// When does the contribution period begin?
uint public beginTime;
// When does the period end?
uint public endTime;
// Are contributions abnormally halted?
bool public isHalted = false;
mapping (address => uint) public record;
uint public total = 0;
}
contract SignedReceipter is Receipter {
function SignedReceipter(address _recorder, address _admin, address _treasury, uint _beginTime, uint _endTime, bytes32 _sigHash) {
recorder = Recorder(_recorder);
admin = _admin;
treasury = _treasury;
beginTime = _beginTime;
endTime = _endTime;
sigHash = _sigHash;
}
modifier only_signed(address who, uint8 v, bytes32 r, bytes32 s) { if (ecrecover(sigHash, v, r, s) != who) throw; _; }
function() payable { throw; }
function receive() payable returns (bool) { throw; }
function receiveFrom(address) payable returns (bool) { throw; }
/// Fallback function: receive a contribution from sender.
function receiveSigned(uint8 v, bytes32 r, bytes32 s) payable returns (bool) {
return processSignedReceipt(msg.sender, v, r, s);
}
/// Receive a contribution from `_recipient`.
function receiveSignedFrom(address _sender, uint8 v, bytes32 r, bytes32 s) payable returns (bool) {
return processSignedReceipt(_sender, v, r, s);
}
/// Receive a contribution from `_recipient`.
function processSignedReceipt(address _sender, uint8 v, bytes32 r, bytes32 s)
only_signed(_sender, v, r, s)
internal
returns (bool)
{
return processReceipt(_sender);
}
bytes32 sigHash;
}
contract CertifyingReceipter is SignedReceipter {
function CertifyingReceipter(address _recorder, address _admin, address _treasury, uint _beginTime, uint _endTime, bytes32 _sigHash, address _certifier) {
recorder = Recorder(_recorder);
admin = _admin;
treasury = _treasury;
beginTime = _beginTime;
endTime = _endTime;
sigHash = _sigHash;
certifier = Certifier(_certifier);
}
/// Fallback function: receive a contribution from sender.
function receiveSigned(uint8 v, bytes32 r, bytes32 s) payable returns (bool) {
return processCertifiedReceipt(msg.sender, v, r, s);
}
function receiveSignedFrom() payable returns (bool) { throw; }
function processCertifiedReceipt(address _sender, uint8 v, bytes32 r, bytes32 s)
internal
only_certified(msg.sender)
returns (bool)
{
return processSignedReceipt(_sender, v, r, s);
}
modifier only_certified(address who) { if (!certifier.certified(who)) throw; _; }
Certifier certifier;
}
contract FairReceipter is CertifyingReceipter{
function FairReceipter(
address _recorder,
address _admin,
address _treasury,
uint _beginTime,
uint _endTime,
bytes32 _sigHash,
address _certifier,
uint _cap,
uint _segmentDuration
) {
recorder = Recorder(_recorder);
admin = _admin;
treasury = _treasury;
beginTime = _beginTime;
endTime = _endTime;
sigHash = _sigHash;
certifier = Certifier(_certifier);
cap = _cap;
segmentDuration = _segmentDuration;
}
function receive(uint8 v, bytes32 r, bytes32 s)
only_under_max(msg.sender)
payable
returns (bool)
{
return processCertifiedReceipt(msg.sender, v, r, s);
}
function maxBuy() when_during_period public returns (uint) {
uint segment = (now - beginTime) / segmentDuration;
// actually just: segment = min(segment, endSegment);
if (segment > endSegment)
segment = endSegment;
return firstMaxBuy << segment;
}
function maxBuyFor(address _who) when_during_period public returns (uint) {
var segmentMaxBuy = maxBuy();
// Should never happen, but just in case...
if (record[_who] >= segmentMaxBuy)
return 0;
return segmentMaxBuy - record[_who];
}
modifier only_under_max(address who) { if (msg.value > maxBuyFor(who)) throw; _; }
uint constant firstMaxBuy = 1 ether;
uint constant endSegment = 16;
uint segmentDuration;
uint cap;
}