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pragma solidity ^0.4.16;
// Original author: Cintix
// Modified by: Moonlambos, yakois
// ERC20 Interface: https://github.com/ethereum/EIPs/issues/20
contract ERC20 {
function transfer(address _to, uint256 _value) returns (bool success);
function balanceOf(address _owner) constant returns (uint256 balance);
}
contract RequestSale {
// Store the amount of ETH deposited by each account.
mapping (address => uint256) public balances;
// Track whether the contract has bought the tokens yet.
bool public bought_tokens;
// Record ETH value of tokens currently held by contract.
uint256 public contract_eth_value;
// Maximum amount of user ETH contract will accept.
uint256 public eth_cap = 500 ether;
// The minimum amount of ETH that must be deposited before the buy-in can be performed.
uint256 constant public min_required_amount = 60 ether;
// The owner's address.
address public owner;
// The crowdsale address. Can be verified at: https://request.network/#/presale.
address public sale = 0xa579E31b930796e3Df50A56829cF82Db98b6F4B3;
//Constructor. Sets the sender as the owner of the contract.
function RequestSale() {
owner = msg.sender;
}
// Allows any user to withdraw his tokens.
// Token's ERC20 address as argument as it is unknow at the time of deployement.
function perform_withdrawal(address tokenAddress) {
// Tokens must be bought
require(bought_tokens);
// Retrieve current token balance of contract
ERC20 token = ERC20(tokenAddress);
uint256 contract_token_balance = token.balanceOf(address(this));
// Disallow token withdrawals if there are no tokens to withdraw.
require(contract_token_balance != 0);
// Store the user's token balance in a temporary variable.
uint256 tokens_to_withdraw = (balances[msg.sender] * contract_token_balance) / contract_eth_value;
// Update the value of tokens currently held by the contract.
contract_eth_value -= balances[msg.sender];
// Update the user's balance prior to sending to prevent recursive call.
balances[msg.sender] = 0;
// Send the funds. Throws on failure to prevent loss of funds.
require(token.transfer(msg.sender, tokens_to_withdraw));
}
// Allows any caller to get his eth refunded.
function refund_me() {
// Store the user's balance prior to withdrawal in a temporary variable.
uint256 eth_to_withdraw = balances[msg.sender];
// Update the user's balance prior to sending ETH to prevent recursive call.
balances[msg.sender] = 0;
// Return the user's funds. Throws on failure to prevent loss of funds.
msg.sender.transfer(eth_to_withdraw);
}
// Buy the tokens. Sends ETH to the presale wallet and records the ETH amount held in the contract.
function buy_the_tokens() {
// Only allow the owner to perform the buy in.
require(msg.sender == owner);
// Short circuit to save gas if the contract has already bought tokens.
require(!bought_tokens);
// The pre-sale address has to be set.
require(sale != 0x0);
// Throw if the contract balance is less than the minimum required amount.
require(this.balance >= min_required_amount);
// Record that the contract has bought the tokens.
bought_tokens = true;
// Record the amount of ETH sent as the contract's current value.
contract_eth_value = this.balance;
// Transfer all the funds to the crowdsale address.
require(sale.call.value(contract_eth_value)());
}
function upgrade_cap() {
// Only the owner can raise the cap.
require(msg.sender == owner);
// Raise the cap.
eth_cap = 1000 ether;
}
// Default function. Called when a user sends ETH to the contract.
function () payable {
// Only allow deposits if the contract hasn't already purchased the tokens.
require(!bought_tokens);
// Only allow deposits that won't exceed the contract's ETH cap.
require(this.balance + msg.value < eth_cap);
// Update records of deposited ETH to include the received amount.
balances[msg.sender] += msg.value;
}
} |