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51 lines
1.9 KiB
51 lines
1.9 KiB
// SPDX-License-Identifier: MIT
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// OpenZeppelin Contracts (last updated v5.2.0) (utils/CAIP2.sol)
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pragma solidity ^0.8.24;
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import {Bytes} from "./Bytes.sol";
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import {Strings} from "./Strings.sol";
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/**
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* @dev Helper library to format and parse CAIP-2 identifiers
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*
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* https://github.com/ChainAgnostic/CAIPs/blob/main/CAIPs/caip-2.md[CAIP-2] defines chain identifiers as:
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* chain_id: namespace + ":" + reference
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* namespace: [-a-z0-9]{3,8}
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* reference: [-_a-zA-Z0-9]{1,32}
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*
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* WARNING: In some cases, multiple CAIP-2 identifiers may all be valid representation of a single chain.
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* For EVM chains, it is recommended to use `eip155:xxx` as the canonical representation (where `xxx` is
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* the EIP-155 chain id). Consider the possible ambiguity when processing CAIP-2 identifiers or when using them
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* in the context of hashes.
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*/
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library CAIP2 {
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using Strings for uint256;
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using Bytes for bytes;
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/// @dev Return the CAIP-2 identifier for the current (local) chain.
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function local() internal view returns (string memory) {
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return format("eip155", block.chainid.toString());
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}
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/**
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* @dev Return the CAIP-2 identifier for a given namespace and reference.
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*
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* NOTE: This function does not verify that the inputs are properly formatted.
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*/
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function format(string memory namespace, string memory ref) internal pure returns (string memory) {
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return string.concat(namespace, ":", ref);
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}
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/**
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* @dev Parse a CAIP-2 identifier into its components.
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*
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* NOTE: This function does not verify that the CAIP-2 input is properly formatted.
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*/
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function parse(string memory caip2) internal pure returns (string memory namespace, string memory ref) {
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bytes memory buffer = bytes(caip2);
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uint256 pos = buffer.indexOf(":");
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return (string(buffer.slice(0, pos)), string(buffer.slice(pos + 1)));
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}
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}
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