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Airdropper Contract

Contract roles:

Role
Description
DEPLOYER_ROLE (onlyDeployer)
Deployer is the address used to deploy the airdrop contract with a specified ERC20 token
OWNER_ROLE (onlyOwner)
Deployer is the hot wallet address of airdropper.xyz

Owner

0xtodo
Hot wallet address controlled by airdropper.xyz multisignature contract

Variables

token - ERC20

ERC20 public token;
The ERC20 token linked to the contract in order to be dropped.

dropAmount - uint256

uint256 public dropAmount;
The total amount of tokens that can be claimed.

dropCount - uint

uint public dropCount;
The number of addresses that claimed the airdrop.

active - bool

bool public active;
Boolean that represents the state of the airdrop.

Public Functions

getAirdrop() - Public

function getAirdrop() public {
// requirements
require(active, "Airdrop is not activated.");
require(hasClaimed[msg.sender] == false, "Only one airdrop is authorized.");
// Change contract stats
hasClaimed[msg.sender] = true;
dropCount += 1;
droppedAddresses.push(msg.sender);
// Get the airdrop
token.transfer(msg.sender, dropAmount);
}
Everyone can call this function to claim the airdrop and receive the specified amount of tokens.
Note:
  • The function is available only if the DEPLOYER_ROLE activated the airdrop.
  • You can only call it once with your address! Any futher attempts will result in a failed transaction.

getAddresses() - Public

function getAddresses() public view returns (address[] memory){
return droppedAddresses;
}
Everyone can call this function to see who benefited from the airdrop.

tokenAmountLeft() - Public

function tokenAmountLeft() public view returns (uint256){
return token.balanceOf(address(this));
}
Everyone can call this function to see the amount of tokens left in the contract.

Owner Functions

setDropAmount() - onlyDeployer or onlyOwner

function setDropAmount(uint256 _dropAmount){
require(isAuthorized(msg.sender), "DOES_NOT_HAVE_PERMISSION");
dropAmount = _dropAmount * 10 ** tokenDecimal;
}
Only the DEPLOYER_ROLE or the OWNER_ROLE can call this function to disable the contract and the getAirdrop() function.

enableAirdrop() - onlyDeployer or onlyOwner

function enableAirdrop() external{
require(isAuthorized(msg.sender), "DOES_NOT_HAVE_PERMISSION");
active = true;
}
Only the DEPLOYER_ROLE or the OWNER_ROLE can call this function to activate the contract and allow the getAirdrop() function to work.

disableAirdrop() - onlyDeployer or onlyOwner

function disableAirdrop() external{
require(isAuthorized(msg.sender), "DOES_NOT_HAVE_PERMISSION");
active = false;
}
Only the DEPLOYER_ROLE or the OWNER_ROLE can call this function to disable the contract and the getAirdrop() function.