71 lines
1.9 KiB
Solidity
71 lines
1.9 KiB
Solidity
// SPDX-License-Identifier: Mozilla Public License 2.0
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pragma solidity ^0.8.17;
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import "@openzeppelin/contracts/access/Ownable.sol";
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import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
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import "@openzeppelin/contracts/utils/Context.sol";
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contract CommunityERC20 is Context, Ownable, ERC20 {
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error CommunityERC20_MaxSupplyLowerThanTotalSupply();
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error CommunityERC20_MaxSupplyReached();
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error CommunityERC20_MismatchingAddressesAndAmountsLengths();
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/**
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* If we want unlimited total supply we should set maxSupply to 2^256-1.
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*/
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uint256 public maxSupply;
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uint8 private customDecimals;
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constructor(
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string memory _name,
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string memory _symbol,
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uint8 _decimals,
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uint256 _maxSupply
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)
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ERC20(_name, _symbol)
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{
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maxSupply = _maxSupply;
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customDecimals = _decimals;
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}
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// Events
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// External functions
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function setMaxSupply(uint256 newMaxSupply) external onlyOwner {
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if (newMaxSupply < totalSupply()) {
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revert CommunityERC20_MaxSupplyLowerThanTotalSupply();
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}
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maxSupply = newMaxSupply;
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}
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/**
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* @dev Mint tokens for each address in `addresses` each one with
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* an amount specified in `amounts`.
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*
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*/
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function mintTo(address[] memory addresses, uint256[] memory amounts) external onlyOwner {
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if (addresses.length != amounts.length) {
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revert CommunityERC20_MismatchingAddressesAndAmountsLengths();
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}
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for (uint256 i = 0; i < addresses.length; i++) {
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uint256 amount = amounts[i];
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if (totalSupply() + amount > maxSupply) {
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revert CommunityERC20_MaxSupplyReached();
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}
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_mint(addresses[i], amount);
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}
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}
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// Public functions
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function decimals() public view virtual override returns (uint8) {
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return customDecimals;
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}
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// Internal functions
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// Private functions
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}
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