Contract Library is the blockchain sleuth's favorite tool chest, allowing developers to easily debug, monitor, query, and analyze any deployed smart contract and its actions.

Contract Library by Dedaub

timestamp

calculateId

checkReservationValidity

grantId

checkValidity

getAmount

getCurrentId

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

interface IGrant {
    /// @notice Error in case the grant is invalid.
    error InvalidGrant();

    /// @notice Error in case the grant configuration is invalid.
    error InvalidConfiguration();

    /// @notice Returns the current grant id.
    function getCurrentId() external view returns (uint256);

    /// @notice Returns the amount of tokens for a grant.
    /// @notice This may contain more complicated logic and is therefore not just a member variable.
    /// @param grantId The grant id to get the amount for.
    function getAmount(uint256 grantId) external view returns (uint256);

    /// @notice Checks whether a grant is valid.
    /// @param grantId The grant id to check.
    function checkValidity(uint256 grantId) external view;

    /// @notice Calculates the grant id for a given timestamp.
    /// @param timestamp The timestamp to calculate the grant id for.
    function calculateId(uint256 timestamp) external view returns (uint256);

    /// @notice Checks whether a reservation is valid.
    /// @param timestamp The timestamp to check the reservation for.
    function checkReservationValidity(uint256 timestamp) external view;
}


src/IGrant.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

import { IGrant } from './IGrant.sol';

contract WLDGrant is IGrant {
    uint256 internal immutable launchDayTimestampInSeconds  = 1690167600; // Monday, 24 July 2023 03:00:00

    function calculateId(uint256 timestamp) external pure returns (uint256) {
        if (timestamp < launchDayTimestampInSeconds) revert InvalidGrant();

        uint weeksSinceLaunch = (timestamp - launchDayTimestampInSeconds) / 1 weeks;
        return 15 + (weeksSinceLaunch - 3) / 2;
    }

    function getCurrentId() external view override returns (uint256) {
        return this.calculateId(block.timestamp);
    }

    function getAmount(uint256) external pure override returns (uint256) {
        return 3 * 10**18;
    }

    function checkValidity(uint256 grantId) external view override{
        if (this.getCurrentId() != grantId) revert InvalidGrant();

        if (grantId < 21) revert InvalidGrant();
    }

    function checkReservationValidity(uint256 timestamp) external view override {
        uint256 grantId = this.calculateId(timestamp);

        // No future grants can be claimed.
        if (grantId >= this.getCurrentId()) revert InvalidGrant();

        // Only grants 20 and above can be reserved.
        if (grantId < 21) revert InvalidGrant();

        // Reservations are only valid for 12 months.
        if (block.timestamp > timestamp + 52 weeks) revert InvalidGrant();
    }
}


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