84 lines
3.0 KiB
Solidity
84 lines
3.0 KiB
Solidity
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// SPDX-License-Identifier: CC0-1.0
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pragma solidity ^0.8.0;
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import "./IERC4974.sol";
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/**
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* See {IERC4974}
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* Implements the ERC4974 Metadata extension.
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*/
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contract LoyaltyPoints is IERC4974 {
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// The address of the operator that can assign ratings
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address private _operator;
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// Mapping of customer addresses to their ratings
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mapping (bytes32 => int8) private _ratings;
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// Initializes the contract by setting the operator to msg.sender
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constructor () {
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_operator = msg.sender;
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}
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// Set the operator address
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// Only the current operator or the contract owner can call this function
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function setOperator(address newOperator) public override {
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require(_operator == msg.sender || msg.sender == address(this), "Only the current operator or the contract owner can set the operator.");
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_operator = newOperator;
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emit NewOperator(_operator);
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}
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// Rate a customer
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// Only the operator can call this function
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function rate(address customer, int8 rating) public override {
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require(_operator == msg.sender, "Only the operator can assign ratings.");
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bytes32 hash = keccak256(abi.encodePacked(customer));
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_ratings[hash] = rating;
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emit Rating(customer, rating);
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}
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// Remove a rating from a customer
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// Only the operator can call this function
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function removeRating(address customer) external override {
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require(_operator == msg.sender, "Only the operator can remove ratings.");
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bytes32 hash = keccak256(abi.encodePacked(customer));
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delete _ratings[hash];
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emit Removal(customer);
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}
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// Get the rating for a customer
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function getOperator() public view returns (address) {
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return _operator;
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}
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// Check if a customer has been rated
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function hasBeenRated(address customer) public view returns (bool) {
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// Hash the customer address
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bytes32 hash = keccak256(abi.encodePacked(customer));
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// Check if the hash exists in the mapping
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return _ratings[hash] != 0;
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}
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function ratingOf(address _rated) public view override returns (int8) {
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bytes32 hash = keccak256(abi.encodePacked(_rated));
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// Check if the customer has been rated
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require(hasBeenRated(_rated), "This customer has not been rated yet.");
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// Return the customer's rating
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return _ratings[hash];
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}
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// Award ETH to a customer based on their rating
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function awardEth(address payable customer) public payable {
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// Calculate the amount of ETH to award based on the customer's rating
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int8 rating = ratingOf(customer);
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require(rating > 0, "Sorry, this customer has a rating less than 0 and cannot be awarded.");
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uint256 award = uint256(int256(rating));
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// Transfer the ETH to the customer
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require(address(this).balance >= award, "Contract has insufficient balance to award ETH.");
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customer.transfer(award);
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}
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receive () external payable {}
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}
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