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AMOCoinSale.sol
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AMOCoinSale.sol
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pragma solidity ^0.4.18;
import "./AMOCoin.sol";
import "zeppelin-solidity/contracts/math/SafeMath.sol";
import "zeppelin-solidity/contracts/lifecycle/Pausable.sol";
contract AMOCoinSale is Pausable {
using SafeMath for uint256;
// Start time of sale
uint256 public startTime;
// End time of sale
uint256 public endTime;
// Address to collect fund
address private fundAddr;
// Token contract instance
AMOCoin public token;
// Amount of raised in Wei (1 ether)
uint256 public totalWeiRaised;
// Base hard cap for each round in ether
uint256 public constant BASE_HARD_CAP_PER_ROUND = 12000 * 1 ether;
uint256 public constant UINT256_MAX = ~uint256(0);
// Base AMO to Ether rate
uint256 public constant BASE_AMO_TO_ETH_RATE = 200000;
// Base minimum contribution
uint256 public constant BASE_MIN_CONTRIBUTION = 0.1 * 1 ether;
// Whitelisted addresses
mapping(address => bool) public whitelist;
// Whitelisted users' contributions per round
mapping(address => mapping(uint8 => uint256)) public contPerRound;
// For each round, there are three stages.
enum Stages {
SetUp,
Started,
Ended
}
// The current stage of the sale
Stages public stage;
// There are three rounds in sale
enum SaleRounds {
EarlyInvestment,
PreSale,
CrowdSale
}
// The current round of the sale
SaleRounds public round;
// Each round has different inforamation
struct RoundInfo {
uint256 minContribution;
uint256 maxContribution;
uint256 hardCap;
uint256 rate;
uint256 weiRaised;
}
// SaleRounds(key) : RoundInfo(value) map
// Since solidity does not support enum as key of map, converted enum to uint8
mapping(uint8 => RoundInfo) public roundInfos;
struct AllocationInfo {
bool isAllowed;
uint256 allowedAmount;
}
// List of users who will be allocated tokens and their allowed amount
mapping(address => AllocationInfo) private allocationList;
/*
* Event for sale start logging
*
* @param startTime: Start date of sale
* @param endTime: End date of sale
* @param round: Round of sale started
*/
event SaleStarted(uint256 startTime, uint256 endTime, SaleRounds round);
/*
* Event for sale end logging
*
* @param endTime: End date of sale
* @param totalWeiRaised: Total amount of raised in Wei after sale ended
* @param round: Round of sale ended
*/
event SaleEnded(uint256 endTime, uint256 totalWeiRaised, SaleRounds round);
/*
* Event for token purchase
*
* @param purchaser: Who paid for the tokens
* @param value: Amount in Wei paid for purchase
* @param amount: Amount of tokens purchased
*/
event TokenPurchase(address indexed purchaser, uint256 value, uint256 amount);
/*
* Modifier to check current stage is same as expected stage
*
* @param expectedStage: Expected current stage
*/
modifier atStage(Stages expectedStage) {
require(stage == expectedStage);
_;
}
/*
* Modifier to check current round is sane as expected round
*
* @param expectedRound: Expected current round
*/
modifier atRound(SaleRounds expectedRound) {
require(round == expectedRound);
_;
}
/*
* Modifier to check purchase is valid
*
* 1. Current round must be smaller than CrowdSale
* 2. Current time must be within sale period
* 3. Purchaser must be enrolled to whitelist
* 4. Purchaser address must be correct
* 5. Contribution must be bigger than minimum contribution for current round
* 6. Sum of contributions must be smaller than max contribution for current round
* 7. Total funds raised in current round must be smaller than hard cap for current round
*/
modifier onlyValidPurchase() {
require(round <= SaleRounds.CrowdSale);
require(now >= startTime && now <= endTime);
uint256 contributionInWei = msg.value;
address purchaser = msg.sender;
require(whitelist[purchaser]);
require(purchaser != address(0));
require(contributionInWei >= roundInfos[uint8(round)].minContribution);
require(
contPerRound[purchaser][uint8(round)].add(contributionInWei)
<= roundInfos[uint8(round)].maxContribution
);
require(
roundInfos[uint8(round)].weiRaised.add(contributionInWei)
<= roundInfos[uint8(round)].hardCap
);
_;
}
/*
* Constructor for AMOCoinSale contract
*
* @param AMOToEtherRate: Number of AMO tokens per Ether
* @param fundAddress: Address where funds are collected
* @param tokenAddress: Address of AMO Token Contract
*/
function AMOCoinSale(
address fundAddress,
address tokenAddress
)
public
{
require(fundAddress != address(0));
require(tokenAddress != address(0));
token = AMOCoin(tokenAddress);
fundAddr = fundAddress;
stage = Stages.Ended;
round = SaleRounds.EarlyInvestment;
uint8 roundIndex = uint8(round);
roundInfos[roundIndex].minContribution = BASE_MIN_CONTRIBUTION;
roundInfos[roundIndex].maxContribution = UINT256_MAX;
roundInfos[roundIndex].hardCap = BASE_HARD_CAP_PER_ROUND;
roundInfos[roundIndex].weiRaised = 0;
roundInfos[roundIndex].rate = BASE_AMO_TO_ETH_RATE;
}
/*
* Fallback function to buy AMO tokens
*/
function () public payable {
buy();
}
/*
* Withdraw ethers to fund address
*/
function withdraw() external onlyOwner {
fundAddr.transfer(this.balance);
}
/*
* Add users to whitelist
* Whitelisted users are accumulated on each round
*
* @param users: Addresses of users who passed KYC
*/
function addManyToWhitelist(address[] users) external onlyOwner {
for (uint32 i = 0; i < users.length; i++) {
addToWhitelist(users[i]);
}
}
/*
* Add one user to whitelist
*
* @param user: Address of user who passed KYC
*/
function addToWhitelist(address user) public onlyOwner {
whitelist[user] = true;
}
/*
* Remove users from whitelist
*
* @param users: Addresses of users who should not belong to whitelist
*/
function removeManyFromWhitelist(address[] users) external onlyOwner {
for (uint32 i = 0; i < users.length; i++) {
removeFromWhitelist(users[i]);
}
}
/*
* Remove users from whitelist
*
* @param users: Addresses of users who should not belong to whitelist
*/
function removeFromWhitelist(address user) public onlyOwner {
whitelist[user] = false;
}
/*
* Set minimum contribution for round
* User have to send more ether than minimum contribution
*
* @param _round: Round to set
* @param _minContribution: Minimum contribution in wei
*/
function setMinContributionForRound(
SaleRounds _round,
uint256 _minContribution
)
public
onlyOwner
atStage(Stages.SetUp)
{
require(round <= _round);
roundInfos[uint8(_round)].minContribution =
(_minContribution == 0) ? BASE_MIN_CONTRIBUTION : _minContribution;
}
/*
* Set max contribution for round
* User can't send more ether than the max contributions in round
*
* @param _round: Round to set
* @param _maxContribution: Max contribution in wei
*/
function setMaxContributionForRound(
SaleRounds _round,
uint256 _maxContribution
)
public
onlyOwner
atStage(Stages.SetUp)
{
require(round <= _round);
roundInfos[uint8(_round)].maxContribution =
(_maxContribution == 0) ? UINT256_MAX : _maxContribution;
}
/*
* Set hard cap for round
* Total wei raised in round should be smaller than hard cap
*
* @param _round: Round to set
* @param _hardCap: Hard cap in wei
*/
function setHardCapForRound(
SaleRounds _round,
uint256 _hardCap
)
public
onlyOwner
atStage(Stages.SetUp)
{
require(round <= _round);
roundInfos[uint8(_round)].hardCap =
(_hardCap == 0) ? BASE_HARD_CAP_PER_ROUND : _hardCap;
}
/*
* Set AMO to Ether rate for round
*
* @param _round: Round to set
* @param _rate: AMO to Ether _rate
*/
function setRateForRound(
SaleRounds _round,
uint256 _rate
)
public
onlyOwner
atStage(Stages.SetUp)
{
require(round <= _round);
roundInfos[uint8(_round)].rate =
(_rate == 0) ? BASE_AMO_TO_ETH_RATE : _rate;
}
/*
* Set up several information for next round
* Only owner can call this method
*/
function setUpSale(
SaleRounds _round,
uint256 _minContribution,
uint256 _maxContribution,
uint256 _hardCap,
uint256 _rate
)
external
onlyOwner
atStage(Stages.Ended)
{
require(round <= _round);
stage = Stages.SetUp;
round = _round;
setMinContributionForRound(_round, _minContribution);
setMaxContributionForRound(_round, _maxContribution);
setHardCapForRound(_round, _hardCap);
setRateForRound(_round, _rate);
}
/*
* Start sale in current round
*/
function startSale(uint256 durationInSeconds)
external
onlyOwner
atStage(Stages.SetUp)
{
require(roundInfos[uint8(round)].minContribution > 0
&& roundInfos[uint8(round)].hardCap > 0);
stage = Stages.Started;
startTime = now;
endTime = startTime.add(durationInSeconds);
SaleStarted(startTime, endTime, round);
}
/*
* End sale in crrent round
*/
function endSale() external onlyOwner atStage(Stages.Started) {
endTime = now;
stage = Stages.Ended;
SaleEnded(endTime, totalWeiRaised, round);
}
function buy()
public
payable
whenNotPaused
atStage(Stages.Started)
onlyValidPurchase()
returns (bool)
{
address purchaser = msg.sender;
uint256 contributionInWei = msg.value;
uint256 tokenAmount = contributionInWei.mul(roundInfos[uint8(round)].rate);
if (!token.transferFrom(token.owner(), purchaser, tokenAmount)) {
revert();
}
totalWeiRaised = totalWeiRaised.add(contributionInWei);
roundInfos[uint8(round)].weiRaised =
roundInfos[uint8(round)].weiRaised.add(contributionInWei);
contPerRound[purchaser][uint8(round)] =
contPerRound[purchaser][uint8(round)].add(contributionInWei);
// Transfer contributions to fund address
fundAddr.transfer(contributionInWei);
TokenPurchase(msg.sender, contributionInWei, tokenAmount);
return true;
}
/*
* Add user and his allowed amount to allocation list
*
* @param user: Address of user to be allocated tokens
* @param amount: Allowed allocation amount of user
*/
function addToAllocationList(address user, uint256 amount)
public
onlyOwner
atRound(SaleRounds.EarlyInvestment)
{
allocationList[user].isAllowed = true;
allocationList[user].allowedAmount = amount;
}
/*
* Add users and their allowed amount to allocation list
*
* @param users: List of Address to be allocated tokens
* @param amount: List of allowed allocation amount of each user
*/
function addManyToAllocationList(address[] users, uint256[] amounts)
external
onlyOwner
atRound(SaleRounds.EarlyInvestment)
{
require(users.length == amounts.length);
for (uint32 i = 0; i < users.length; i++) {
addToAllocationList(users[i], amounts[i]);
}
}
/*
* Remove user from allocation list
*
* @param user: Address of user to be removed
*/
function removeFromAllocationList(address user)
public
onlyOwner
atRound(SaleRounds.EarlyInvestment)
{
allocationList[user].isAllowed = false;
}
/*
* Remove users from allocation list
*
* @param user: Address list of users to be removed
*/
function removeManyFromAllocationList(address[] users)
external
onlyOwner
atRound(SaleRounds.EarlyInvestment)
{
for (uint32 i = 0; i < users.length; i++) {
removeFromAllocationList(users[i]);
}
}
/*
* Allocate tokens to user
* Only avaliable on early investment
*
* @param to: Address of user to be allocated tokens
* @param tokenAmount: Amount of tokens to be allocated
*/
function allocateTokens(address to, uint256 tokenAmount)
public
onlyOwner
atRound(SaleRounds.EarlyInvestment)
returns (bool)
{
require(allocationList[to].isAllowed
&& tokenAmount <= allocationList[to].allowedAmount);
if (!token.transferFrom(token.owner(), to, tokenAmount)) {
revert();
}
return true;
}
/*
* Allocate tokens to user
* Only avaliable on early investment
*
* @param toList: List of addresses to be allocated tokens
* @param tokenAmountList: List of token amount to be allocated to each address
*/
function allocateTokensToMany(address[] toList, uint256[] tokenAmountList)
external
onlyOwner
atRound(SaleRounds.EarlyInvestment)
returns (bool)
{
require(toList.length == tokenAmountList.length);
for (uint32 i = 0; i < toList.length; i++) {
allocateTokens(toList[i], tokenAmountList[i]);
}
return true;
}
}