viem
Version:
45 lines • 2.23 kB
JavaScript
const siweDateTimeRegex = /^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}(\.\d+)?(Z|[+-]\d{2}:\d{2})$/;
function isValidSiweDateTime(value) {
if (!siweDateTimeRegex.test(value))
return false;
return !Number.isNaN(new Date(value).getTime());
}
function parseSiweDateTime(value) {
// Reject non-RFC-3339 / non-EIP-4361 date-time strings before Date coercion
// (JS Date accepts many non-SIWE forms that would otherwise look "valid").
if (!isValidSiweDateTime(value))
return new Date(Number.NaN);
return new Date(value);
}
/**
* @description Parses EIP-4361 formatted message into message fields object.
*
* @see https://eips.ethereum.org/EIPS/eip-4361
*
* @returns EIP-4361 fields object
*/
export function parseSiweMessage(message) {
const { scheme, statement, ...prefix } = (message.match(prefixRegex)
?.groups ?? {});
const { chainId, expirationTime, issuedAt, notBefore, requestId, ...suffix } = (message.match(suffixRegex)?.groups ?? {});
const resources = message.split('Resources:')[1]?.split('\n- ').slice(1);
return {
...prefix,
...suffix,
...(chainId ? { chainId: Number(chainId) } : {}),
...(expirationTime
? { expirationTime: parseSiweDateTime(expirationTime) }
: {}),
...(issuedAt ? { issuedAt: parseSiweDateTime(issuedAt) } : {}),
...(notBefore ? { notBefore: parseSiweDateTime(notBefore) } : {}),
...(requestId ? { requestId } : {}),
...(resources ? { resources } : {}),
...(scheme ? { scheme } : {}),
...(statement ? { statement } : {}),
};
}
// https://regexr.com/80gdj
const prefixRegex = /^(?:(?<scheme>[a-zA-Z][a-zA-Z0-9+\-.]*):\/\/)?(?<domain>[a-zA-Z0-9+-.]*(?::[0-9]{1,5})?) (?:wants you to sign in with your Ethereum account:\n)(?<address>0x[a-fA-F0-9]{40})\n\n(?:(?<statement>.*)\n\n)?/;
// https://regexr.com/80gf9
const suffixRegex = /(?:URI: (?<uri>.+))\n(?:Version: (?<version>.+))\n(?:Chain ID: (?<chainId>\d+))\n(?:Nonce: (?<nonce>[a-zA-Z0-9]+))\n(?:Issued At: (?<issuedAt>.+))(?:\nExpiration Time: (?<expirationTime>.+))?(?:\nNot Before: (?<notBefore>.+))?(?:\nRequest ID: (?<requestId>.+))?/;
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