feat: add parse/stringify/validate/version/NIL APIs (#479)

Add the following new APIs:
- uuid.NIL The nil UUID string (all zeros)
- uuid.parse() Convert UUID string to array of bytes
- uuid.stringify() Convert array of bytes to UUID string
- uuid.validate() Test a string to see if it is a valid UUID
- uuid.version() Detect RFC version of a UUID

This commit also adds more accurate validation when stringifying UUIDs and improves UUID parsing performance (for v3/v5 UUIDs) significantly (Thanks @awwit!).

Co-authored-by: Christoph Tavan <dev@tavan.de>
Co-authored-by: Ignat Prokopovich <ignatius.awwit@gmail.com>
Co-authored-by: Robert Kieffer <robert@broofa.com>
Co-authored-by: Linus Unnebäck <linus@folkdatorn.se>

bundlewatch.config.json

@@ -1,13 +1,13 @@
 {
   "files": [
-    { "path": "./examples/browser-rollup/dist/v1-size.js", "maxSize": "0.8 kB" },
-    { "path": "./examples/browser-rollup/dist/v3-size.js", "maxSize": "1.8 kB" },
-    { "path": "./examples/browser-rollup/dist/v4-size.js", "maxSize": "0.5 kB" },
-    { "path": "./examples/browser-rollup/dist/v5-size.js", "maxSize": "1.2 kB" },
+    { "path": "./examples/browser-rollup/dist/v1-size.js", "maxSize": "1.0 kB" },
+    { "path": "./examples/browser-rollup/dist/v3-size.js", "maxSize": "2.1 kB" },
+    { "path": "./examples/browser-rollup/dist/v4-size.js", "maxSize": "0.7 kB" },
+    { "path": "./examples/browser-rollup/dist/v5-size.js", "maxSize": "1.5 kB" },
 
-    { "path": "./examples/browser-webpack/dist/v1-size.js", "maxSize": "1.0 kB" },
-    { "path": "./examples/browser-webpack/dist/v3-size.js", "maxSize": "2.0 kB" },
-    { "path": "./examples/browser-webpack/dist/v4-size.js", "maxSize": "0.7 kB" },
-    { "path": "./examples/browser-webpack/dist/v5-size.js", "maxSize": "1.4 kB" }
+    { "path": "./examples/browser-webpack/dist/v1-size.js", "maxSize": "1.3 kB" },
+    { "path": "./examples/browser-webpack/dist/v3-size.js", "maxSize": "2.5 kB" },
+    { "path": "./examples/browser-webpack/dist/v4-size.js", "maxSize": "1.0 kB" },
+    { "path": "./examples/browser-webpack/dist/v5-size.js", "maxSize": "1.9 kB" }
   ]
 }

examples/benchmark/benchmark.html

@@ -5,6 +5,8 @@
 <script src="./node_modules/uuid/dist/umd/uuidv3.min.js"></script>
 <script src="./node_modules/uuid/dist/umd/uuidv4.min.js"></script>
 <script src="./node_modules/uuid/dist/umd/uuidv5.min.js"></script>
+<script src="./node_modules/uuid/dist/umd/uuidParse.min.js"></script>
+<script src="./node_modules/uuid/dist/umd/uuidStringify.min.js"></script>
 <script src="./node_modules/lodash/lodash.js"></script>
 <script src="./node_modules/benchmark/benchmark.js"></script>
 <script src="./benchmark.js"></script>

examples/benchmark/benchmark.js

@@ -5,46 +5,96 @@ const uuidv1 = (typeof window !== 'undefined' && window.uuidv1) || require('uuid
 const uuidv4 = (typeof window !== 'undefined' && window.uuidv4) || require('uuid').v4;
 const uuidv3 = (typeof window !== 'undefined' && window.uuidv3) || require('uuid').v3;
 const uuidv5 = (typeof window !== 'undefined' && window.uuidv5) || require('uuid').v5;
+const uuidParse = (typeof window !== 'undefined' && window.uuidParse) || require('uuid').parse;
+const uuidStringify =
+  (typeof window !== 'undefined' && window.uuidStringify) || require('uuid').stringify;
 
 console.log('Starting. Tests take ~1 minute to run ...');
 
-const array = new Array(16);
-
-const suite = new Benchmark.Suite({
-  onError(event) {
-    console.error(event.target.error);
-  },
-});
-
-suite
-  .add('uuidv1()', function () {
-    uuidv1();
-  })
-  .add('uuidv1() fill existing array', function () {
-    try {
-      uuidv1(null, array, 0);
-    } catch (err) {
-      // The spec (https://tools.ietf.org/html/rfc4122#section-4.2.1.2) defines that only 10M/s v1
-      // UUIDs can be generated on a single node. This library throws an error if we hit that limit
-      // (which can happen on modern hardware and modern Node.js versions).
-    }
-  })
-  .add('uuidv4()', function () {
-    uuidv4();
-  })
-  .add('uuidv4() fill existing array', function () {
-    uuidv4(null, array, 0);
-  })
-  .add('uuidv3()', function () {
-    uuidv3('hello.example.com', uuidv3.DNS);
-  })
-  .add('uuidv5()', function () {
-    uuidv5('hello.example.com', uuidv5.DNS);
-  })
-  .on('cycle', function (event) {
-    console.log(event.target.toString());
-  })
-  .on('complete', function () {
-    console.log('Fastest is ' + this.filter('fastest').map('name'));
-  })
-  .run();
+function testParseAndStringify() {
+  const suite = new Benchmark.Suite({
+    onError(event) {
+      console.error(event.target.error);
+    },
+  });
+
+  const BYTES = [
+    0x0f,
+    0x5a,
+    0xbc,
+    0xd1,
+    0xc1,
+    0x94,
+    0x47,
+    0xf3,
+    0x90,
+    0x5b,
+    0x2d,
+    0xf7,
+    0x26,
+    0x3a,
+    0x08,
+    0x4b,
+  ];
+
+  suite
+    .add('uuidStringify()', function () {
+      uuidStringify(BYTES);
+    })
+    .add('uuidParse()', function () {
+      uuidParse('0f5abcd1-c194-47f3-905b-2df7263a084b');
+    })
+    .on('cycle', function (event) {
+      console.log(event.target.toString());
+    })
+    .on('complete', function () {
+      console.log('---\n');
+    })
+    .run();
+}
+
+function testGeneration() {
+  const array = new Array(16);
+
+  const suite = new Benchmark.Suite({
+    onError(event) {
+      console.error(event.target.error);
+    },
+  });
+
+  suite
+    .add('uuidv1()', function () {
+      uuidv1();
+    })
+    .add('uuidv1() fill existing array', function () {
+      try {
+        uuidv1(null, array, 0);
+      } catch (err) {
+        // The spec (https://tools.ietf.org/html/rfc4122#section-4.2.1.2) defines that only 10M/s v1
+        // UUIDs can be generated on a single node. This library throws an error if we hit that limit
+        // (which can happen on modern hardware and modern Node.js versions).
+      }
+    })
+    .add('uuidv4()', function () {
+      uuidv4();
+    })
+    .add('uuidv4() fill existing array', function () {
+      uuidv4(null, array, 0);
+    })
+    .add('uuidv3()', function () {
+      uuidv3('hello.example.com', uuidv3.DNS);
+    })
+    .add('uuidv5()', function () {
+      uuidv5('hello.example.com', uuidv5.DNS);
+    })
+    .on('cycle', function (event) {
+      console.log(event.target.toString());
+    })
+    .on('complete', function () {
+      console.log('Fastest is ' + this.filter('fastest').map('name'));
+    })
+    .run();
+}
+
+testParseAndStringify();
+testGeneration();

package.json

@@ -73,6 +73,7 @@
     "lint-staged": "10.2.11",
     "npm-run-all": "4.1.5",
     "prettier": "2.0.5",
+    "random-seed": "0.3.0",
     "rollup": "2.18.0",
     "rollup-plugin-terser": "6.1.0",
     "runmd": "1.3.2",

rollup.config.js

@@ -20,4 +20,11 @@ export default [
   chunk('v3', 'uuidv3'),
   chunk('v4', 'uuidv4'),
   chunk('v5', 'uuidv5'),
+
+  chunk('nil', 'uuidNIL'),
+
+  chunk('version', 'uuidVersion'),
+  chunk('validate', 'uuidValidate'),
+  chunk('parse', 'uuidParse'),
+  chunk('stringify', 'uuidStringify'),
 ];

src/index.js

@@ -2,3 +2,8 @@ export { default as v1 } from './v1.js';
 export { default as v3 } from './v3.js';
 export { default as v4 } from './v4.js';
 export { default as v5 } from './v5.js';
+export { default as NIL } from './nil.js';
+export { default as version } from './version.js';
+export { default as validate } from './validate.js';
+export { default as stringify } from './stringify.js';
+export { default as parse } from './parse.js';

src/nil.js

@@ -0,0 +1 @@
+export default '00000000-0000-0000-0000-000000000000';

src/parse.js

@@ -0,0 +1,41 @@
+import validate from './validate.js';
+
+function parse(uuid) {
+  if (!validate(uuid)) {
+    throw TypeError('Invalid UUID');
+  }
+
+  let v;
+  const arr = new Uint8Array(16);
+
+  // Parse ########-....-....-....-............
+  arr[0] = (v = parseInt(uuid.slice(0, 8), 16)) >>> 24;
+  arr[1] = (v >>> 16) & 0xff;
+  arr[2] = (v >>> 8) & 0xff;
+  arr[3] = v & 0xff;
+
+  // Parse ........-####-....-....-............
+  arr[4] = (v = parseInt(uuid.slice(9, 13), 16)) >>> 8;
+  arr[5] = v & 0xff;
+
+  // Parse ........-....-####-....-............
+  arr[6] = (v = parseInt(uuid.slice(14, 18), 16)) >>> 8;
+  arr[7] = v & 0xff;
+
+  // Parse ........-....-....-####-............
+  arr[8] = (v = parseInt(uuid.slice(19, 23), 16)) >>> 8;
+  arr[9] = v & 0xff;
+
+  // Parse ........-....-....-....-############
+  // (Use "/" to avoid 32-bit truncation when bit-shifting high-order bytes)
+  arr[10] = ((v = parseInt(uuid.slice(24, 36), 16)) / 0x10000000000) & 0xff;
+  arr[11] = (v / 0x100000000) & 0xff;
+  arr[12] = (v >>> 24) & 0xff;
+  arr[13] = (v >>> 16) & 0xff;
+  arr[14] = (v >>> 8) & 0xff;
+  arr[15] = v & 0xff;
+
+  return arr;
+}
+
+export default parse;

src/regex.js

@@ -0,0 +1 @@
+export default /^(?:[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}|00000000-0000-0000-0000-000000000000)$/i;

src/sha1-browser.js

@@ -29,6 +29,9 @@ function sha1(bytes) {
     for (let i = 0; i < msg.length; ++i) {
       bytes.push(msg.charCodeAt(i));
     }
+  } else if (!Array.isArray(bytes)) {
+    // Convert Array-like to Array
+    bytes = Array.prototype.slice.call(bytes);
   }
 
   bytes.push(0x80);

src/stringify.js

@@ -0,0 +1,51 @@
+import validate from './validate.js';
+
+/**
+ * Convert array of 16 byte values to UUID string format of the form:
+ * XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
+ */
+const byteToHex = [];
+
+for (let i = 0; i < 256; ++i) {
+  byteToHex.push((i + 0x100).toString(16).substr(1));
+}
+
+function stringify(arr, offset = 0) {
+  // Note: Be careful editing this code!  It's been tuned for performance
+  // and works in ways you may not expect. See https://github.com/uuidjs/uuid/pull/434
+  const uuid = (
+    byteToHex[arr[offset + 0]] +
+    byteToHex[arr[offset + 1]] +
+    byteToHex[arr[offset + 2]] +
+    byteToHex[arr[offset + 3]] +
+    '-' +
+    byteToHex[arr[offset + 4]] +
+    byteToHex[arr[offset + 5]] +
+    '-' +
+    byteToHex[arr[offset + 6]] +
+    byteToHex[arr[offset + 7]] +
+    '-' +
+    byteToHex[arr[offset + 8]] +
+    byteToHex[arr[offset + 9]] +
+    '-' +
+    byteToHex[arr[offset + 10]] +
+    byteToHex[arr[offset + 11]] +
+    byteToHex[arr[offset + 12]] +
+    byteToHex[arr[offset + 13]] +
+    byteToHex[arr[offset + 14]] +
+    byteToHex[arr[offset + 15]]
+  ).toLowerCase();
+
+  // Consistency check for valid UUID.  If this throws, it's likely due to one
+  // of the following:
+  // - One or more input array values don't map to a hex octet (leading to
+  // "undefined" in the uuid)
+  // - Invalid input values for the RFC `version` or `variant` fields
+  if (!validate(uuid)) {
+    throw TypeError('Stringified UUID is invalid');
+  }
+
+  return uuid;
+}
+
+export default stringify;

src/v1.js

@@ -1,5 +1,5 @@
 import rng from './rng.js';
-import bytesToUuid from './bytesToUuid.js';
+import stringify from './stringify.js';
 
 // **`v1()` - Generate time-based UUID**
 //
@@ -109,7 +109,7 @@ function v1(options, buf, offset) {
     b[i + n] = node[n];
   }
 
-  return buf || bytesToUuid(b);
+  return buf || stringify(b);
 }
 
 export default v1;