github.com/google/uuid v1.6.0: generate DCE Security UUID v2 with uuid.NewDCESecurity

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: generate DCE Security UUID v2 with uuid.NewDCESecurity
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/github.com/google/uuid@v1.6.0
Demonstrate these symbols/APIs:
  - NewDCESecurity
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@11.8.0
  - runtime: node@24.13.1

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:12ccf402b7ee4372b7070f3943c46da9b849ecd907fd136ff2cdc63b88a64b7e","contract":["uuid.NewDCESecurity generates valid UUID v2 for specified Domain and ID","uuid.NewDCESecurity returns UUID with Version 2 and RFC4122 variant","uuid.UUID Domain method returns the assigned domain value","uuid.UUID ID method returns the assigned 32-bit ID value","uuid.Parse successfully parses generated UUID v2 string back to original UUID"],"goal":"generate DCE Security UUID v2 with uuid.NewDCESecurity","kind":"HOW","packages":["pkg:golang/github.com/google/uuid@v1.6.0"],"schemaVersion":1,"symbols":["NewDCESecurity"]},"contractCommand":["go","run","./test"],"environment":{"arch":"x64","ecosystem":"golang","os":"windows","osVersionBucket":"11","packageManager":"go","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/github.com/google/uuid@v1.6.0"],"schemaVersion":1,"symbols":["NewDCESecurity"],"verifierAdapter":"golang@1"}

module sample

go 1.26.5

require github.com/google/uuid v1.6.0

github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=

package main

import (
	"fmt"

	"github.com/google/uuid"
)

// GenerateDCESecurityUUID creates a DCE Security (Version 2) UUID with domain and id.
func GenerateDCESecurityUUID(domain uuid.Domain, id uint32) (uuid.UUID, error) {
	return uuid.NewDCESecurity(domain, id)
}

func main() {
	domain := uuid.Person
	var id uint32 = 1001

	u, err := GenerateDCESecurityUUID(domain, id)
	if err != nil {
		fmt.Printf("Error generating DCE Security UUID: %v\n", err)
		return
	}

	fmt.Printf("Generated DCE Security UUID: %s\n", u.String())
	fmt.Printf("Version: %d\n", u.Version())
	fmt.Printf("Variant: %v\n", u.Variant())
	fmt.Printf("Domain: %d\n", u.Domain())
	fmt.Printf("ID: %d\n", u.ID())
}

{
  "schemaVersion": 1,
  "goal": "generate DCE Security UUID v2 with uuid.NewDCESecurity",
  "kind": "HOW",
  "packages": [
    "pkg:golang/github.com/google/uuid@v1.6.0"
  ],
  "symbols": [
    "NewDCESecurity"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@11.8.0",
    "runtime": "node@24.13.1"
  }
}

package main

import (
	"fmt"
	"os"

	"github.com/google/uuid"
)

func assertTrue(name string, condition bool) {
	if !condition {
		fmt.Fprintf(os.Stderr, "Assertion failed for %s: expected true, got false\n", name)
		os.Exit(1)
	}
}

func assertEqual(name, actual, expected string) {
	if actual != expected {
		fmt.Fprintf(os.Stderr, "Assertion failed for %s: got %q, expected %q\n", name, actual, expected)
		os.Exit(1)
	}
}

func main() {
	// uuid.NewDCESecurity generates valid UUID v2 for specified Domain and ID
	domain := uuid.Person
	var id uint32 = 1001

	u, err := uuid.NewDCESecurity(domain, id)
	if err != nil {
		fmt.Fprintf(os.Stderr, "uuid.NewDCESecurity failed: %v\n", err)
		os.Exit(1)
	}
	assertTrue("uuid.NewDCESecurity returns non-nil UUID", u != uuid.Nil)
	assertTrue("uuid.NewDCESecurity byte length is 16", len(u) == 16)

	// uuid.NewDCESecurity returns UUID with Version 2 and RFC4122 variant
	assertTrue("uuid.NewDCESecurity version is 2", u.Version() == 2)
	assertTrue("uuid.NewDCESecurity variant is RFC4122", u.Variant() == uuid.RFC4122)

	// uuid.UUID Domain method returns the assigned domain value
	assertTrue("u.Domain() returns assigned domain", u.Domain() == domain)

	// uuid.UUID ID method returns the assigned 32-bit ID value
	assertTrue("u.ID() returns assigned id", u.ID() == id)

	// uuid.Parse successfully parses generated UUID v2 string back to original UUID
	str := u.String()
	assertEqual("uuid string length is 36", fmt.Sprintf("%d", len(str)), "36")
	parsed, err := uuid.Parse(str)
	if err != nil {
		fmt.Fprintf(os.Stderr, "uuid.Parse failed: %v\n", err)
		os.Exit(1)
	}
	assertTrue("uuid.Parse returns original UUID", parsed == u)

	fmt.Println("All contract assertions passed successfully.")
}