Whitelisted proposers

contracts/azorius/HatsProposalCreationWhitelist.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity =0.8.19;
+
+import {OwnableUpgradeable} from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
+import {IHats} from "../interfaces/hats/full/IHats.sol";
+
+abstract contract HatsProposalCreationWhitelist is OwnableUpgradeable {
+    event HatWhitelisted(uint256 hatId);
+    event HatRemovedFromWhitelist(uint256 hatId);
+
+    IHats public hatsContract;
+
+    /** Array to store whitelisted Hat IDs. */
+    uint256[] public whitelistedHatIds;
+
+    error InvalidHatsContract();
+    error NoHatsWhitelisted();
+    error HatAlreadyWhitelisted();
+    error HatNotWhitelisted();
+
+    /**
+     * Sets up the contract with its initial parameters.
+     *
+     * @param initializeParams encoded initialization parameters:
+     * `address _hatsContract`, `uint256[] _initialWhitelistedHats`
+     */
+    function setUp(bytes memory initializeParams) public virtual {
+        (address _hatsContract, uint256[] memory _initialWhitelistedHats) = abi
+            .decode(initializeParams, (address, uint256[]));
+
+        if (_hatsContract == address(0)) revert InvalidHatsContract();
+        hatsContract = IHats(_hatsContract);
+
+        if (_initialWhitelistedHats.length == 0) revert NoHatsWhitelisted();
+        for (uint256 i = 0; i < _initialWhitelistedHats.length; i++) {
+            _whitelistHat(_initialWhitelistedHats[i]);
+        }
+    }
+
+    /**
+     * Adds a Hat to the whitelist for proposal creation.
+     * @param _hatId The ID of the Hat to whitelist
+     */
+    function whitelistHat(uint256 _hatId) external onlyOwner {
+        _whitelistHat(_hatId);
+    }
+
+    /**
+     * Internal function to add a Hat to the whitelist.
+     * @param _hatId The ID of the Hat to whitelist
+     */
+    function _whitelistHat(uint256 _hatId) internal {
+        for (uint256 i = 0; i < whitelistedHatIds.length; i++) {
+            if (whitelistedHatIds[i] == _hatId) revert HatAlreadyWhitelisted();
+        }
+        whitelistedHatIds.push(_hatId);
+        emit HatWhitelisted(_hatId);
+    }
+
+    /**
+     * Removes a Hat from the whitelist for proposal creation.
+     * @param _hatId The ID of the Hat to remove from the whitelist
+     */
+    function removeHatFromWhitelist(uint256 _hatId) external onlyOwner {
+        bool found = false;
+        for (uint256 i = 0; i < whitelistedHatIds.length; i++) {
+            if (whitelistedHatIds[i] == _hatId) {
+                whitelistedHatIds[i] = whitelistedHatIds[
+                    whitelistedHatIds.length - 1
+                ];
+                whitelistedHatIds.pop();
+                found = true;
+                break;
+            }
+        }
+        if (!found) revert HatNotWhitelisted();
+
+        emit HatRemovedFromWhitelist(_hatId);
+    }
+
+    /**
+     * @dev Checks if an address is authorized to create proposals.
+     * @param _address The address to check for proposal creation authorization.
+     * @return bool Returns true if the address is wearing any of the whitelisted Hats, false otherwise.
+     * @notice This function overrides the isProposer function from the parent contract.
+     * It iterates through all whitelisted Hat IDs and checks if the given address
+     * is wearing any of them using the Hats Protocol.
+     */
+    function isProposer(address _address) public view virtual returns (bool) {
+        for (uint256 i = 0; i < whitelistedHatIds.length; i++) {
+            if (hatsContract.isWearerOfHat(_address, whitelistedHatIds[i])) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Returns the number of whitelisted hats.
+     * @return The number of whitelisted hats
+     */
+    function getWhitelistedHatsCount() public view returns (uint256) {
+        return whitelistedHatIds.length;
+    }
+
+    /**
+     * Checks if a hat is whitelisted.
+     * @param _hatId The ID of the Hat to check
+     * @return True if the hat is whitelisted, false otherwise
+     */
+    function isHatWhitelisted(uint256 _hatId) public view returns (bool) {
+        for (uint256 i = 0; i < whitelistedHatIds.length; i++) {
+            if (whitelistedHatIds[i] == _hatId) {
+                return true;
+            }
+        }
+        return false;
+    }
+}