Pack: using Chainlink VRF v2 (Direct Funding Method) #296
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| * Use other forwarders only if there's a strong reason to bypass this check. | ||
| */ | ||
| address[] memory forwarders = new address[](_trustedForwarders.length + 1); | ||
| uint256 i; |
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contracts/pack/PackVRFDirect.sol
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| } | ||
| } | ||
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| /*/////////////////////////////////////////////////////////////// | ||
| Getter functions | ||
| //////////////////////////////////////////////////////////////*/ | ||
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| /// @dev Returns the underlying contents of a pack. | ||
| function getPackContents(uint256 _packId) | ||
| public | ||
| view | ||
| returns (Token[] memory contents, uint256[] memory perUnitAmounts) | ||
| { | ||
| PackInfo memory pack = packInfo[_packId]; | ||
| uint256 total = getTokenCountOfBundle(_packId); | ||
| contents = new Token[](total); | ||
| perUnitAmounts = new uint256[](total); | ||
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| for (uint256 i = 0; i < total; i += 1) { | ||
| contents[i] = getTokenOfBundle(_packId, i); | ||
| } | ||
| perUnitAmounts = pack.perUnitAmounts; | ||
| } | ||
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| /*/////////////////////////////////////////////////////////////// | ||
| Internal functions | ||
| //////////////////////////////////////////////////////////////*/ | ||
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| /// @dev Returns whether owner can be set in the given execution context. | ||
| function _canSetOwner() internal view override returns (bool) { | ||
| return hasRole(DEFAULT_ADMIN_ROLE, _msgSender()); | ||
| } | ||
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| /// @dev Returns whether royalty info can be set in the given execution context. | ||
| function _canSetRoyaltyInfo() internal view override returns (bool) { | ||
| return hasRole(DEFAULT_ADMIN_ROLE, _msgSender()); | ||
| } | ||
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| /// @dev Returns whether contract metadata can be set in the given execution context. | ||
| function _canSetContractURI() internal view override returns (bool) { | ||
| return hasRole(DEFAULT_ADMIN_ROLE, _msgSender()); | ||
| } | ||
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| /*/////////////////////////////////////////////////////////////// | ||
| Miscellaneous | ||
| //////////////////////////////////////////////////////////////*/ | ||
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| /** | ||
| * @dev See {ERC1155-_beforeTokenTransfer}. | ||
| */ | ||
| function _beforeTokenTransfer( | ||
| address operator, | ||
| address from, | ||
| address to, | ||
| uint256[] memory ids, | ||
| uint256[] memory amounts, | ||
| bytes memory data | ||
| ) internal virtual override { | ||
| super._beforeTokenTransfer(operator, from, to, ids, amounts, data); | ||
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| // if transfer is restricted on the contract, we still want to allow burning and minting | ||
| if (!hasRole(transferRole, address(0)) && from != address(0) && to != address(0)) { | ||
| require(hasRole(transferRole, from) || hasRole(transferRole, to), "!TRANSFER_ROLE"); | ||
| } | ||
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| if (from == address(0)) { | ||
| for (uint256 i = 0; i < ids.length; ++i) { | ||
| totalSupply[ids[i]] += amounts[i]; | ||
| } | ||
| } | ||
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| if (to == address(0)) { | ||
| for (uint256 i = 0; i < ids.length; ++i) { | ||
| totalSupply[ids[i]] -= amounts[i]; | ||
| } | ||
| } | ||
| } | ||
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| /// @dev See EIP-2771 | ||
| function _msgSender() | ||
| internal | ||
| view | ||
| virtual | ||
| override(ContextUpgradeable, ERC2771ContextUpgradeable) | ||
| returns (address sender) | ||
| { | ||
| return ERC2771ContextUpgradeable._msgSender(); | ||
| } | ||
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| /// @dev See EIP-2771 | ||
| function _msgData() | ||
| internal | ||
| view | ||
| virtual | ||
| override(ContextUpgradeable, ERC2771ContextUpgradeable) | ||
| returns (bytes calldata) | ||
| { | ||
| return ERC2771ContextUpgradeable._msgData(); | ||
| } | ||
| } |
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| */ | ||
| function createPack( | ||
| Token[] calldata contents, | ||
| uint256[] calldata numOfRewardUnits, |
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Variable names too similar
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Introduces
PackVRFDirect: uses Chainlink VRF to get robust random numbers (instead of pseudo-random numbers from block variables) to make the process of selection of rewards fair i.e. the chance of receiving a reward is a true representation of how rare the reward is.