39 lines
1.2 KiB
JavaScript
39 lines
1.2 KiB
JavaScript
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'use strict';
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var convert = require('./convert');
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var utf8 = require('./utf8');
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var keccak256 = require('./keccak256');
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var Zeros = [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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function namehash(name, depth) {
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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 = Zeros;
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var processed = 0;
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while (name.length && (!depth || processed < depth)) {
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var partition = name.match(Partition);
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var label = utf8.toUtf8Bytes(partition[3]);
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result = keccak256(convert.concat([result, keccak256(label)]));
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name = partition[2] || '';
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processed++;
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}
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return convert.hexlify(result);
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}
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module.exports = namehash;
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