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
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ERC20 public token;
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The ERC20 token linked to the contract in order to be dropped.
dropAmount - uint256
1
uint256 public dropAmount;
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The total amount of tokens that can be claimed. 
dropCount - uint
1
uint public dropCount;
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The number of addresses that claimed the airdrop.
active - bool
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bool public active;
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Boolean that represents the state of the airdrop. 
Public Functions
getAirdrop() - Public
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    function getAirdrop() public {
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        // requirements
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        require(active, "Airdrop is not activated.");
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        require(hasClaimed[msg.sender] == false, "Only one airdrop is authorized.");
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​
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        // Change contract stats
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        hasClaimed[msg.sender] = true;
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        dropCount += 1;
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        droppedAddresses.push(msg.sender);
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​
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        // Get the airdrop
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        token.transfer(msg.sender, dropAmount);
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    }
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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.
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getAddresses() - Public
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    function getAddresses() public view returns (address[] memory){
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        return droppedAddresses;
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    }
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Everyone can call this function to see who benefited from the airdrop.
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tokenAmountLeft() - Public
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    function tokenAmountLeft() public view returns (uint256){
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        return token.balanceOf(address(this));
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    }
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Everyone can call this function to see the amount of tokens left in the contract.
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Owner  Functions
setDropAmount() - onlyDeployer or onlyOwner
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function setDropAmount(uint256 _dropAmount){
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    require(isAuthorized(msg.sender), "DOES_NOT_HAVE_PERMISSION");
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    dropAmount = _dropAmount * 10 ** tokenDecimal;
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}
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Only the DEPLOYER_ROLE or the OWNER_ROLE can call this function to disable the contract and the getAirdrop() function.
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enableAirdrop() - onlyDeployer or onlyOwner
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function enableAirdrop() external{
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    require(isAuthorized(msg.sender), "DOES_NOT_HAVE_PERMISSION");
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    active = true;
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}
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Only the DEPLOYER_ROLE or the OWNER_ROLE can call this function to activate the contract and allow the getAirdrop() function to work.
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disableAirdrop() - onlyDeployer or onlyOwner
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function disableAirdrop() external{
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    require(isAuthorized(msg.sender), "DOES_NOT_HAVE_PERMISSION");
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    active = false;
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}
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Only the DEPLOYER_ROLE or the OWNER_ROLE can call this function to disable the contract and the getAirdrop() function.
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