ethers.js/packages/hash/src.ts/index.ts

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"use strict";
import { Bytes, concat, hexlify } from "@ethersproject/bytes";
import { nameprep, toUtf8Bytes } from "@ethersproject/strings";
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import { keccak256 } from "@ethersproject/keccak256";
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import { Logger } from "@ethersproject/logger";
import { version } from "./_version";
const logger = new Logger(version);
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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]);
const Partition = new RegExp("^((.*)\\.)?([^.]+)$");
export function isValidName(name: string): boolean {
try {
const comps = name.split(".");
for (let i = 0; i < comps.length; i++) {
if (nameprep(comps[i]).length === 0) {
throw new Error("empty")
}
}
return true;
} catch (error) { }
return false;
}
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export function namehash(name: string): string {
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/* istanbul ignore if */
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if (typeof(name) !== "string") {
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logger.throwArgumentError("invalid address - " + String(name), "name", name);
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}
let result: string | Uint8Array = Zeros;
while (name.length) {
const partition = name.match(Partition);
const label = toUtf8Bytes(nameprep(partition[3]));
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result = keccak256(concat([result, keccak256(label)]));
name = partition[2] || "";
}
return hexlify(result);
}
export function id(text: string): string {
return keccak256(toUtf8Bytes(text));
}
export const messagePrefix = "\x19Ethereum Signed Message:\n";
export function hashMessage(message: Bytes | string): string {
if (typeof(message) === "string") { message = toUtf8Bytes(message); }
return keccak256(concat([
toUtf8Bytes(messagePrefix),
toUtf8Bytes(String(message.length)),
message
]));
}