Pure JavaScript Based Universally Unique Identifier (UUID)
This is a pure JavaScript and dependency-free library for the generation of DCE 1.1, ISO/IEC 11578:1996 and IETF RFC-4122 compliant Universally Unique Identifier (UUID). It supports DCE 1.1 variant UUIDs of version 1 (time and node based), version 3 (name based, MD5), version 4 (random number based) and version 5 (name based, SHA-1). It can be used in both Node.js based server and browser based client environments.
The essential points of this implementation (in contrast to the many
others) are: First, although internally 32/64 bit unsigned integer
arithmentic and MD5/SHA-1 digest algorithmic is required, this UUID
implementation is fully self-contained and dependency-free. Second,
this implementation wraps around either Uint8Array, Buffer or
Array standard classes and this way tries to represent UUIDs as best
as possible in the particular environment. Third, thanks to a Universal
Module Definition (UMD) wrapper, this library works out-of-the-box in
all important JavaScript run-time environments.
UUIDs are 128 bit numbers which are intended to have a high likelihood of uniqueness over space and time and are computationally difficult to guess. They are globally unique identifiers which can be locally generated without contacting a global registration authority. UUIDs are intended as unique identifiers for both mass tagging objects with an extremely short lifetime and to reliably identifying very persistent objects across a network.
According to the DCE 1.1, ISO/IEC 11578:1996 and IETF RFC-4122 standards, a DCE 1.1 variant UUID is a 128 bit number defined out of 7 fields, each field a multiple of an octet in size and stored in network byte order:
[4]
version
-->| |<--
| |
| | [16]
[32] [16] | |time_hi
time_low time_mid | _and_version
|<---------------------------->||<------------>||<------------>|
| MSB || || | |
| / || || | |
|/ || || | |
+------++------++------++------++------++------++------++------+~~
| 15 || 14 || 13 || 12 || 11 || 10 |####9 || 8 |
| MSO || || || || || |#### || |
+------++------++------++------++------++------++------++------+~~
7654321076543210765432107654321076543210765432107654321076543210
~~+------++------++------++------++------++------++------++------+
##* 7 || 6 || 5 || 4 || 3 || 2 || 1 || 0 |
##* || || || || || || || LSO |
~~+------++------++------++------++------++------++------++------+
7654321076543210765432107654321076543210765432107654321076543210
| | || || /|
| | || || / |
| | || || LSB |
|<---->||<---->||<-------------------------------------------->|
|clk_seq clk_seq node
|_hi_res _low [48]
|[5-6] [8]
| |
-->| |<--
variant
[2-3]An example of a UUID binary representation is the octet stream 0xF8 0x1D 0x4F 0xAE 0x7D 0xEC 0x11 0xD0 0xA7 0x65 0x00 0xA0 0xC9 0x1E 0x6B 0xF6.
According to the DCE 1.1, ISO/IEC 11578:1996 and IETF RFC-4122 standards, a DCE 1.1 variant UUID is represented as an ASCII string consisting of 8 hexadecimal digits followed by a hyphen, then three groups of 4 hexadecimal digits each followed by a hyphen, then 12 hexadecimal digits.
$ npm install pure-uuid
- global environment:
var uuid = new UUID(3, "ns:URL", "http://example.com/");- CommonJS environment:
var UUID = require("pure-uuid");
var uuid = new UUID(3, "ns:URL", "http://example.com/");- AMD environment:
define(["pure-uuid"], function (UUID) {
var uuid = new UUID(3, "ns:URL", "http://example.com/");
});interface UUID {
/* making */
make(version: number, ...params: any[]): UUID;
/* parsing */
parse(str: string): UUID;
/* formatting */
format(type?: string): string;
/* formatting (alias) */
toString(type?: string): string;
/* sensible JSON serialization */
toJSON(): string;
/* importing */
import(arr: number[]): UUID;
/* exporting */
export(): number[];
/* byte-wise comparison */
compare(other: UUID): boolean;
/* equal check */
equal(other: UUID): boolean;
/* fold 1-4 times */
fold(k: number): number[];
}
export interface UUIDConstructor {
/* default construction */
new(): UUID;
/* parsing construction */
new(uuid: string): UUID;
/* making construction */
new(version: number): UUID;
new(version: number, ns: string, data: string): UUID;
}
declare var UUID: UUIDConstructor;
export default UUID;// load a UUID
uuid = new UUID("0a300ee9-f9e4-5697-a51a-efc7fafaba67");
// make a UUID version 1 (time and node based)
uuid = new UUID(1);
// make a UUID version 3 (name-based, MD5)
uuid = new UUID(3, "ns:URL", "http://example.com/");
// make a UUID version 4 (random number based)
uuid = new UUID(4);
// make a UUID version 5 (name-based, SHA-1)
uuid = new UUID(5, "ns:URL", "http://example.com/");
// format a UUID in standard format
str = uuid.format()
str = uuid.format("std")
// format a UUID in Base16 format
str = uuid.format("b16")
// format a UUID in ZeroMQ-Base85 format
str = uuid.format("z85")Copyright (c) 2004-2020 Dr. Ralf S. Engelschall (http://engelschall.com/)
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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