65 lines
2.0 KiB
TypeScript
65 lines
2.0 KiB
TypeScript
"use strict";
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// @TODO: Migrate this to a better named package...
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import * as errors from "@ethersproject/errors";
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import { Bytes, concat, hexlify } from "@ethersproject/bytes";
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import { toUtf8Bytes } from "@ethersproject/strings";
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import { keccak256 } from "@ethersproject/keccak256";
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///////////////////////////////
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const Zeros = new Uint8Array([0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]);
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const Partition = new RegExp("^((.*)\\.)?([^.]+)$");
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const UseSTD3ASCIIRules = new RegExp("^[a-z0-9.-]*$");
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export function namehash(name: string): string {
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if (typeof(name) !== "string") {
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errors.throwError("invalid address - " + String(name), errors.INVALID_ARGUMENT, {
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argument: "name",
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value: name
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});
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}
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name = name.toLowerCase();
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// Supporting the full UTF-8 space requires additional (and large)
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// libraries, so for now we simply do not support them.
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// It should be fairly easy in the future to support systems with
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// String.normalize, but that is future work.
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if (!name.match(UseSTD3ASCIIRules)) {
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errors.throwError("contains invalid UseSTD3ASCIIRules characters", errors.INVALID_ARGUMENT, {
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argument: "name",
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value: name
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});
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}
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let result: string | Uint8Array = Zeros;
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while (name.length) {
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let partition = name.match(Partition);
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let label = toUtf8Bytes(partition[3]);
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result = keccak256(concat([result, keccak256(label)]));
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name = partition[2] || "";
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}
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return hexlify(result);
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}
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export function id(text: string): string {
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return keccak256(toUtf8Bytes(text));
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}
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export const messagePrefix = "\x19Ethereum Signed Message:\n";
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export function hashMessage(message: Bytes | string): string {
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if (typeof(message) === "string") { message = toUtf8Bytes(message); }
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return keccak256(concat([
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toUtf8Bytes(messagePrefix),
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toUtf8Bytes(String(message.length)),
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message
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]));
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}
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