35 lines
1.1 KiB
TypeScript
35 lines
1.1 KiB
TypeScript
'use strict';
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import { concat, hexlify } from './bytes';
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import { toUtf8Bytes } from './utf8';
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import { keccak256 } from './keccak256';
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var 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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var Partition = new RegExp("^((.*)\\.)?([^.]+)$");
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var UseSTD3ASCIIRules = new RegExp("^[a-z0-9.-]*$");
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export function namehash(name: string): string {
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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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throw new Error('contains invalid UseSTD3ASCIIRules characters');
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}
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var result: string | Uint8Array = Zeros;
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while (name.length) {
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var partition = name.match(Partition);
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var 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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