golang.org/x/net v0.37.0

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: verify pkg:golang/golang.org/x/net@v0.37.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/net@v0.37.0
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

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:sha256:4259ae75d9ea90826b9b43fe82ca4056deb329fc3ae8e93d55fbccf4845bd600","contract":["websocket.NewConfig creates a valid WebSocket configuration with URL, Origin, and protocol version","websocket.Handler converts a function into an http.Handler that serves WebSocket connections","websocket.Dial establishes a WebSocket client connection to a server with specified origin","websocket.Message.Send and websocket.Message.Receive transmit and receive text string payloads","websocket.Message.Send and websocket.Message.Receive transmit and receive binary byte payloads","websocket.JSON.Send and websocket.JSON.Receive serialize, transmit, and deserialize structured data"],"goal":"verify pkg:golang/golang.org/x/net@v0.37.0","kind":"HOW","packages":["pkg:golang/golang.org/x/net@v0.37.0"],"schemaVersion":1},"contractCommand":["go","run","./test"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"golang","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"go","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/golang.org/x/net@v0.37.0"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/net@v0.37.0","verifierAdapter":"golang@1"}

module example.com/sample

go 1.26.6

require golang.org/x/net v0.37.0 // indirect

golang.org/x/net v0.37.0 h1:1zLorHbz+LYj7MQlSf1+2tPIIgibq2eL5xkrGk6f+2c=
golang.org/x/net v0.37.0/go.mod h1:ivrbrMbzFq5J41QOQh0siUuly180yBYtLp+CKbEaFx8=

package main

import (
	"fmt"
	"log"
	"net/http"
	"net/http/httptest"
	"strings"

	"golang.org/x/net/websocket"
)

// EchoServer handles WebSocket messages and echoes them back.
func EchoServer(ws *websocket.Conn) {
	for {
		var msg string
		err := websocket.Message.Receive(ws, &msg)
		if err != nil {
			break
		}
		if err := websocket.Message.Send(ws, "echo: "+msg); err != nil {
			break
		}
	}
}

type Payload struct {
	Greeting string `json:"greeting"`
	Count    int    `json:"count"`
}

// JSONServer handles JSON-encoded WebSocket messages.
func JSONServer(ws *websocket.Conn) {
	for {
		var p Payload
		err := websocket.JSON.Receive(ws, &p)
		if err != nil {
			break
		}
		p.Greeting = strings.ToUpper(p.Greeting)
		p.Count *= 2
		if err := websocket.JSON.Send(ws, p); err != nil {
			break
		}
	}
}

func main() {
	mux := http.NewServeMux()
	mux.Handle("/echo", websocket.Handler(EchoServer))
	mux.Handle("/json", websocket.Handler(JSONServer))

	server := httptest.NewServer(mux)
	defer server.Close()

	wsURL := "ws" + strings.TrimPrefix(server.URL, "http") + "/echo"
	origin := "http://localhost"

	ws, err := websocket.Dial(wsURL, "", origin)
	if err != nil {
		log.Fatalf("Dial failed: %v", err)
	}
	defer ws.Close()

	if err := websocket.Message.Send(ws, "hello world"); err != nil {
		log.Fatalf("Send failed: %v", err)
	}

	var reply string
	if err := websocket.Message.Receive(ws, &reply); err != nil {
		log.Fatalf("Receive failed: %v", err)
	}
	fmt.Printf("Received: %s\n", reply)

	// Test JSON
	jsonWSURL := "ws" + strings.TrimPrefix(server.URL, "http") + "/json"
	wsJSON, err := websocket.Dial(jsonWSURL, "", origin)
	if err != nil {
		log.Fatalf("Dial json failed: %v", err)
	}
	defer wsJSON.Close()

	sendPayload := Payload{Greeting: "ping", Count: 5}
	if err := websocket.JSON.Send(wsJSON, sendPayload); err != nil {
		log.Fatalf("JSON Send failed: %v", err)
	}

	var recvPayload Payload
	if err := websocket.JSON.Receive(wsJSON, &recvPayload); err != nil {
		log.Fatalf("JSON Receive failed: %v", err)
	}
	fmt.Printf("Received JSON: %+v\n", recvPayload)
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:golang/golang.org/x/net@v0.37.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/net@v0.37.0"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

package main

import (
	"bytes"
	"fmt"
	"net/http"
	"net/http/httptest"
	"os"
	"strings"

	"golang.org/x/net/websocket"
)

type TestMessage struct {
	Command string `json:"command"`
	Value   int    `json:"value"`
}

func main() {
	// Assertion 1: websocket.NewConfig creates a valid WebSocket configuration with URL, Origin, and protocol version
	cfg, err := websocket.NewConfig("ws://example.com/ws", "http://example.com")
	if err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: websocket.NewConfig failed: %v\n", err)
		os.Exit(1)
	}
	if cfg.Location == nil || cfg.Location.Path != "/ws" {
		fmt.Fprintf(os.Stderr, "FAIL: websocket.NewConfig invalid location: %v\n", cfg.Location)
		os.Exit(1)
	}
	if cfg.Origin == nil || cfg.Origin.Host != "example.com" {
		fmt.Fprintf(os.Stderr, "FAIL: websocket.NewConfig invalid origin: %v\n", cfg.Origin)
		os.Exit(1)
	}
	if cfg.Version != websocket.ProtocolVersionHybi13 {
		fmt.Fprintf(os.Stderr, "FAIL: websocket.NewConfig expected Hybi13 protocol version, got %d\n", cfg.Version)
		os.Exit(1)
	}

	// Assertion 2: websocket.Handler converts a function into an http.Handler that serves WebSocket connections
	mux := http.NewServeMux()
	mux.Handle("/echo", websocket.Handler(func(ws *websocket.Conn) {
		for {
			var msg string
			if err := websocket.Message.Receive(ws, &msg); err != nil {
				break
			}
			if err := websocket.Message.Send(ws, "echo:"+msg); err != nil {
				break
			}
		}
	}))

	mux.Handle("/binary", websocket.Handler(func(ws *websocket.Conn) {
		for {
			var data []byte
			if err := websocket.Message.Receive(ws, &data); err != nil {
				break
			}
			resp := append([]byte("bin:"), data...)
			if err := websocket.Message.Send(ws, resp); err != nil {
				break
			}
		}
	}))

	mux.Handle("/json", websocket.Handler(func(ws *websocket.Conn) {
		for {
			var m TestMessage
			if err := websocket.JSON.Receive(ws, &m); err != nil {
				break
			}
			m.Command = "ack:" + m.Command
			m.Value *= 10
			if err := websocket.JSON.Send(ws, m); err != nil {
				break
			}
		}
	}))

	server := httptest.NewServer(mux)
	defer server.Close()

	wsBase := "ws" + strings.TrimPrefix(server.URL, "http")

	// Assertion 3: websocket.Dial establishes a WebSocket client connection to a server with specified origin
	wsEcho, err := websocket.Dial(wsBase+"/echo", "", "http://localhost")
	if err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: websocket.Dial failed: %v\n", err)
		os.Exit(1)
	}
	defer wsEcho.Close()

	// Assertion 4: websocket.Message.Send and websocket.Message.Receive transmit and receive text string payloads
	textPayload := "csx-test-payload-12345"
	if err := websocket.Message.Send(wsEcho, textPayload); err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: websocket.Message.Send text failed: %v\n", err)
		os.Exit(1)
	}
	var textReply string
	if err := websocket.Message.Receive(wsEcho, &textReply); err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: websocket.Message.Receive text failed: %v\n", err)
		os.Exit(1)
	}
	if textReply != "echo:"+textPayload {
		fmt.Fprintf(os.Stderr, "FAIL: text reply mismatch: got %q, want %q\n", textReply, "echo:"+textPayload)
		os.Exit(1)
	}

	// Assertion 5: websocket.Message.Send and websocket.Message.Receive transmit and receive binary byte payloads
	wsBin, err := websocket.Dial(wsBase+"/binary", "", "http://localhost")
	if err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: websocket.Dial binary failed: %v\n", err)
		os.Exit(1)
	}
	defer wsBin.Close()

	binPayload := []byte{0x01, 0x02, 0x03, 0xFF, 0xFE}
	if err := websocket.Message.Send(wsBin, binPayload); err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: websocket.Message.Send binary failed: %v\n", err)
		os.Exit(1)
	}
	var binReply []byte
	if err := websocket.Message.Receive(wsBin, &binReply); err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: websocket.Message.Receive binary failed: %v\n", err)
		os.Exit(1)
	}
	expectedBin := append([]byte("bin:"), binPayload...)
	if !bytes.Equal(binReply, expectedBin) {
		fmt.Fprintf(os.Stderr, "FAIL: binary reply mismatch: got %x, want %x\n", binReply, expectedBin)
		os.Exit(1)
	}

	// Assertion 6: websocket.JSON.Send and websocket.JSON.Receive serialize, transmit, and deserialize structured data
	wsJSON, err := websocket.Dial(wsBase+"/json", "", "http://localhost")
	if err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: websocket.Dial json failed: %v\n", err)
		os.Exit(1)
	}
	defer wsJSON.Close()

	sendObj := TestMessage{Command: "compute", Value: 42}
	if err := websocket.JSON.Send(wsJSON, sendObj); err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: websocket.JSON.Send failed: %v\n", err)
		os.Exit(1)
	}
	var recvObj TestMessage
	if err := websocket.JSON.Receive(wsJSON, &recvObj); err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: websocket.JSON.Receive failed: %v\n", err)
		os.Exit(1)
	}
	if recvObj.Command != "ack:compute" || recvObj.Value != 420 {
		fmt.Fprintf(os.Stderr, "FAIL: JSON struct mismatch: got %+v, want Command='ack:compute', Value=420\n", recvObj)
		os.Exit(1)
	}

	fmt.Println("PASS: pkg:golang/golang.org/x/net@v0.37.0 contract passed")
}