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utils/namehash.js

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+'use strict';
+
+var convert = require('./convert');
+var utf8 = require('./utf8');
+var keccak256 = require('./keccak256');
+
+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];
+var Partition = new RegExp("^((.*)\\.)?([^.]+)$");
+var UseSTD3ASCIIRules = new RegExp("^[a-z0-9.-]*$");
+
+function namehash(name, depth) {
+    name = name.toLowerCase();
+
+    // Supporting the full UTF-8 space requires additional (and large)
+    // libraries, so for now we simply do not support them.
+    // It should be fairly easy in the future to support systems with
+    // String.normalize, but that is future work.
+    if (!name.match(UseSTD3ASCIIRules)) {
+        throw new Error('contains invalid UseSTD3ASCIIRules characters');
+    }
+
+    var result = Zeros;
+    var processed = 0;
+    while (name.length && (!depth || processed < depth)) {
+        var partition = name.match(Partition);
+        var label = utf8.toUtf8Bytes(partition[3]);
+        result = keccak256(convert.concat([result, keccak256(label)]));
+
+        name = partition[2] || '';
+
+        processed++;
+    }
+
+    return convert.hexlify(result);
+}
+
+module.exports = namehash;
+