/** * 2.0之后才有Editor.Utils.UuidUtils.compressUuid | decompressUuid的转换 * 这里主要处理base和uuid转换,其他由node-uuid库提供 */ var Uuid = require("node-uuid"); var Base64KeyChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; var AsciiTo64 = new Array(128); for (var i = 0; i < 128; ++i) { AsciiTo64[i] = 0; } for (i = 0; i < 64; ++i) { AsciiTo64[Base64KeyChars.charCodeAt(i)] = i; } var Reg_Dash = /-/g; var Reg_Uuid = /^[0-9a-fA-F-]{36}$/; var Reg_NormalizedUuid = /^[0-9a-fA-F]{32}$/; var Reg_CompressedUuid = /^[0-9a-zA-Z+/]{22,23}$/; var UuidUtils = { compressUuid: function (uuid, min) { if (Reg_Uuid.test(uuid)) { uuid = uuid.replace(Reg_Dash, ""); } else if (!Reg_NormalizedUuid.test(uuid)) { return uuid; } var reserved = min === true ? 2 : 5; return UuidUtils.compressHex(uuid, reserved); }, compressHex: function (hexString, reservedHeadLength) { var length = hexString.length; var i; if (typeof reservedHeadLength !== "undefined") { i = reservedHeadLength; } else { i = length % 3; } var head = hexString.slice(0, i); var base64Chars = []; while (i < length) { var hexVal1 = parseInt(hexString[i], 16); var hexVal2 = parseInt(hexString[i + 1], 16); var hexVal3 = parseInt(hexString[i + 2], 16); base64Chars.push(Base64KeyChars[(hexVal1 << 2) | (hexVal2 >> 2)]); base64Chars.push(Base64KeyChars[((hexVal2 & 3) << 4) | hexVal3]); i += 3; } return head + base64Chars.join(""); }, decompressUuid: function (str) { if (str.length === 23) { // decode base64 var hexChars = []; for (var i = 5; i < 23; i += 2) { var lhs = AsciiTo64[str.charCodeAt(i)]; var rhs = AsciiTo64[str.charCodeAt(i + 1)]; hexChars.push((lhs >> 2).toString(16)); hexChars.push((((lhs & 3) << 2) | (rhs >> 4)).toString(16)); hexChars.push((rhs & 0xf).toString(16)); } // str = str.slice(0, 5) + hexChars.join(""); } else if (str.length === 22) { // decode base64 var hexChars = []; for (var i = 2; i < 22; i += 2) { var lhs = AsciiTo64[str.charCodeAt(i)]; var rhs = AsciiTo64[str.charCodeAt(i + 1)]; hexChars.push((lhs >> 2).toString(16)); hexChars.push((((lhs & 3) << 2) | (rhs >> 4)).toString(16)); hexChars.push((rhs & 0xf).toString(16)); } // str = str.slice(0, 2) + hexChars.join(""); } return [ str.slice(0, 8), str.slice(8, 12), str.slice(12, 16), str.slice(16, 20), str.slice(20), ].join("-"); }, isUuid: function (str) { if (typeof str == "string") { return ( Reg_CompressedUuid.test(str) || Reg_NormalizedUuid.test(str) || Reg_Uuid.test(str) ); } else { return false; } }, uuid: function () { var uuid = Uuid.v4(); return UuidUtils.compressUuid(uuid, true); }, uuidv4: function () { var uuid = Uuid.v4(); return uuid; }, }; module.exports = UuidUtils;