forked from DecentralizedClimateFoundation/DCIPs
38 lines
1.5 KiB
Solidity
38 lines
1.5 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 "@openzeppelin/contracts/utils/introspection/IERC165.sol";
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import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";
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import "./ERC4671.sol";
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import "./IERC4671Pull.sol";
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abstract contract ERC4671Pull is ERC4671, IERC4671Pull {
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using ECDSA for bytes32;
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/// @notice Pull a token from the owner wallet to the caller's wallet
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/// @param tokenId Identifier of the token to transfer
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/// @param owner Address that owns tokenId
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/// @param signature Signed data (tokenId, owner, recipient) by the owner of the token
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function pull(uint256 tokenId, address owner, bytes memory signature) public virtual override {
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Token storage token = _getTokenOrRevert(tokenId);
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require(token.owner == owner, "Provided owner does not own the token");
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address recipient = msg.sender;
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bytes32 messageHash = keccak256(abi.encodePacked(tokenId, owner, recipient));
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bytes32 signedHash = messageHash.toEthSignedMessageHash();
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require(signedHash.recover(signature) == owner, "Invalid signature");
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bool valid = token.valid;
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_removeToken(tokenId);
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_mintUnsafe(recipient, tokenId, valid);
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}
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function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC4671) returns (bool) {
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return
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interfaceId == type(IERC4671Pull).interfaceId ||
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super.supportsInterface(interfaceId);
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}
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}
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