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FairReceipter.sol
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FairReceipter.sol
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//! A receipting contract. Just records who sent what.
//!
//! Copyright 2016 Gavin Wood, Parity Technologies Ltd.
//!
//! Licensed under the Apache License, Version 2.0 (the "License");
//! you may not use this file except in compliance with the License.
//! You may obtain a copy of the License at
//!
//! http://www.apache.org/licenses/LICENSE-2.0
//!
//! Unless required by applicable law or agreed to in writing, software
//! distributed under the License is distributed on an "AS IS" BASIS,
//! WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//! See the License for the specific language governing permissions and
//! limitations under the License.
pragma solidity ^0.4.7;
import "Owned.sol";
import "Certifier.sol";
import "Token.sol";
interface Recorder {
function received(address _who, uint _value);
function done();
}
// BasicCoin, ECR20 tokens that all belong to the owner for sending around
contract BasicToken is Token {
// STRUCTS
// An account; has a balance and an allowance.
struct Account {
uint balance;
mapping (address => uint) allowanceOf;
}
// FIELDS
// (STATE)
// All accounts.
mapping (address => Account) accounts;
// The total number of tokens.
uint public totalSupply = 0;
// MODIFIERS
// Throws unless `_owner` owns some `_amount` of tokens.
modifier when_owns(address _owner, uint _amount) {
if (accounts[_owner].balance < _amount) throw;
_;
}
// Throws unless `_spender` is permitted to transfer `_amount` from the
// account of `_owner`.
modifier when_has_allowance(address _owner, address _spender, uint _amount) {
if (accounts[_owner].allowanceOf[_spender] < _amount) throw;
_;
}
// FUNCTIONS
// Disable the fallback function.
function() { throw; }
// (CONSTANT)
// Return the balance of a specific address.
function balanceOf(address _who)
constant
returns (uint256)
{
return accounts[_who].balance;
}
// Return the delegated allowance available to spend.
function allowance(address _owner, address _spender)
constant
returns (uint256)
{
return accounts[_owner].allowanceOf[_spender];
}
// (MUTATING)
// Transfer tokens between accounts.
function transfer(address _to, uint256 _value)
when_owns(msg.sender, _value)
returns (bool)
{
accounts[msg.sender].balance -= _value;
accounts[_to].balance += _value;
Transfer(msg.sender, _to, _value);
return true;
}
// Transfer tokens from a delegated account.
function transferFrom(address _from, address _to, uint256 _value)
when_owns(_from, _value)
when_has_allowance(_from, msg.sender, _value)
returns (bool)
{
accounts[_from].allowanceOf[msg.sender] -= _value;
accounts[_from].balance -= _value;
accounts[_to].balance += _value;
Transfer(_from, _to, _value);
return true;
}
// Approve an amount for a delegate to transfer.
function approve(address _spender, uint256 _value)
returns (bool)
{
accounts[msg.sender].allowanceOf[_spender] += _value;
Approval(msg.sender, _spender, _value);
return true;
}
}
contract BasicMintableToken is BasicToken {
// The address of the account which is allowed to mint tokens.
address minter;
// Only continue if the sender is the minter.
modifier only_minter { if (msg.sender != minter) throw; _; }
// Tokens have been minted.
event Minted(address indexed who, uint value);
// Create the contract, setting the minting account.
function BasicMintableToken(address _minter) {
minter = _minter;
}
function setMinter(address _minter) only_minter {
minter = _minter;
}
// Credit `_value` tokens to `_who`.
function mint(address _who, uint _value) only_minter {
accounts[_who].balance += _value;
totalSupply += _value;
Minted(_who, _value);
}
}
contract EndableMintableToken is BasicToken {
// The address of the account which is allowed to mint tokens.
address minter;
// Only continue if the sender is the minter.
modifier only_minter { if (msg.sender != minter) throw; _; }
// Only continue if minting has ceased.
modifier when_transferable { if (minter != 0) throw; _; }
// Tokens have been minted.
event Minted(address indexed who, uint value);
// Create the contract, setting the minting account.
function EndableMintableToken(address _minter) {
minter = _minter;
}
// Cease all minting activities and make the tokens transferable.
//
// This cannot be reversed.
function ceaseMinting() only_minter {
minter = 0;
}
// Credit `_value` tokens to `_who`.
function mint(address _who, uint _value) only_minter {
accounts[_who].balance += _value;
totalSupply += _value;
Minted(_who, _value);
}
// Transfer tokens between accounts.
function transfer(address _to, uint256 _value)
when_transferable
returns (bool)
{
return super.transfer(_to, _value);
}
// Transfer tokens from a delegated account.
function transferFrom(address _from, address _to, uint256 _value)
when_transferable
returns (bool)
{
return super.transferFrom(_from, _to, _value);
}
}
contract ThawableMintableToken is EndableMintableToken {
// Unix time when frozen tokens may be thawed.
uint iceAgeEnds;
mapping (address => uint) public frozenBalanceOf;
// Only if we're out of the ice age.
modifier only_when_thawable { if (now < iceAgeEnds) throw; _; }
// Tokens have been minted.
event MintedFrozen(address indexed who, uint value);
// Tokens have been minted.
event Thawed(address indexed who, uint value);
// Create the contract, setting the minting account.
function ThawableMintableToken(uint _iceAgeEnds) {
iceAgeEnds = _iceAgeEnds;
}
// Credit `_value` frozen tokens to `_who`.
function mintFrozen(address _who, uint _value) only_minter {
frozenBalanceOf[_who] += _value;
totalSupply += _value;
MintedFrozen(_who, _value);
}
// Converts all of the sender's frozen tokens into normal tokens if we're
// out of the ice age.
function thaw() only_when_thawable {
Thawed(msg.sender, frozenBalanceOf[msg.sender]);
accounts[msg.sender].balance += frozenBalanceOf[msg.sender];
frozenBalanceOf[msg.sender] = 0;
}
}
contract BasicMintableReceiverToken is ThawableMintableToken, Recorder {
function received(address _who, uint _value) { super.mint(_who, _value); }
function done() { super.ceaseMinting(); }
}
/// 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 {
recorder.done();
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;
}