53 lines
1.5 KiB
JavaScript
53 lines
1.5 KiB
JavaScript
var bytesToUuid = require('./bytesToUuid');
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function uuidToBytes(uuid) {
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// Note: We assume we're being passed a valid uuid string
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var bytes = [];
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uuid.replace(/[a-fA-F0-9]{2}/g, function(hex) {
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bytes.push(parseInt(hex, 16));
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});
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return bytes;
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}
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function stringToBytes(str) {
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str = unescape(encodeURIComponent(str)); // UTF8 escape
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var bytes = new Array(str.length);
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for (var i = 0; i < str.length; i++) {
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bytes[i] = str.charCodeAt(i);
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}
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return bytes;
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}
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module.exports = function(name, version, hashfunc) {
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var generateUUID = function(value, namespace, buf, offset) {
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var off = buf && offset || 0;
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if (typeof(value) == 'string') value = stringToBytes(value);
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if (typeof(namespace) == 'string') namespace = uuidToBytes(namespace);
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if (!Array.isArray(value)) throw TypeError('value must be an array of bytes');
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if (!Array.isArray(namespace) || namespace.length !== 16) throw TypeError('namespace must be uuid string or an Array of 16 byte values');
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// Per 4.3
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var bytes = hashfunc(namespace.concat(value));
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bytes[6] = (bytes[6] & 0x0f) | version;
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bytes[8] = (bytes[8] & 0x3f) | 0x80;
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if (buf) {
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for (var idx = 0; idx < 16; ++idx) {
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buf[off+idx] = bytes[idx];
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}
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}
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return buf || bytesToUuid(bytes);
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};
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generateUUID.name = name;
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// Pre-defined namespaces, per Appendix C
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generateUUID.DNS = '6ba7b810-9dad-11d1-80b4-00c04fd430c8';
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generateUUID.URL = '6ba7b811-9dad-11d1-80b4-00c04fd430c8';
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return generateUUID;
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};
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