1var bytesToUuid = require('./bytesToUuid'); 2 3function uuidToBytes(uuid) { 4 // Note: We assume we're being passed a valid uuid string 5 var bytes = []; 6 uuid.replace(/[a-fA-F0-9]{2}/g, function(hex) { 7 bytes.push(parseInt(hex, 16)); 8 }); 9 10 return bytes; 11} 12 13function stringToBytes(str) { 14 str = unescape(encodeURIComponent(str)); // UTF8 escape 15 var bytes = new Array(str.length); 16 for (var i = 0; i < str.length; i++) { 17 bytes[i] = str.charCodeAt(i); 18 } 19 return bytes; 20} 21 22module.exports = function(name, version, hashfunc) { 23 var generateUUID = function(value, namespace, buf, offset) { 24 var off = buf && offset || 0; 25 26 if (typeof(value) == 'string') value = stringToBytes(value); 27 if (typeof(namespace) == 'string') namespace = uuidToBytes(namespace); 28 29 if (!Array.isArray(value)) throw TypeError('value must be an array of bytes'); 30 if (!Array.isArray(namespace) || namespace.length !== 16) throw TypeError('namespace must be uuid string or an Array of 16 byte values'); 31 32 // Per 4.3 33 var bytes = hashfunc(namespace.concat(value)); 34 bytes[6] = (bytes[6] & 0x0f) | version; 35 bytes[8] = (bytes[8] & 0x3f) | 0x80; 36 37 if (buf) { 38 for (var idx = 0; idx < 16; ++idx) { 39 buf[off+idx] = bytes[idx]; 40 } 41 } 42 43 return buf || bytesToUuid(bytes); 44 }; 45 46 // Function#name is not settable on some platforms (#270) 47 try { 48 generateUUID.name = name; 49 } catch (err) { 50 } 51 52 // Pre-defined namespaces, per Appendix C 53 generateUUID.DNS = '6ba7b810-9dad-11d1-80b4-00c04fd430c8'; 54 generateUUID.URL = '6ba7b811-9dad-11d1-80b4-00c04fd430c8'; 55 56 return generateUUID; 57}; 58