google.golang.org/genproto/googleapis/api v0.0.0-20260406210006-6f92a3bedf2d: httpbody.HttpBody

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 google.golang.org/genproto/googleapis/api/httpbody.HttpBody in pkg:golang/google.golang.org/genproto/googleapis/api@v0.0.0-20260406210006-6f92a3bedf2d
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/google.golang.org/genproto/googleapis/api@v0.0.0-20260406210006-6f92a3bedf2d
Demonstrate these symbols/APIs:
  - google.golang.org/genproto/googleapis/api/httpbody.HttpBody

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:sha256:73e31a04656fa30ab22ee59fa0149a0d09bfa2b46cccf834ed85f470e0a2b5a6","contract":["httpbody.HttpBody encapsulates raw payload bytes with HTTP content-type header string","httpbody.HttpBody serializes and deserializes accurately with protobuf wire format","httpbody.HttpBody stores arbitrary application metadata extensions as protobuf Any messages","httpbody.HttpBody provides safe getters with default values for empty and nil instances"],"goal":"verify google.golang.org/genproto/googleapis/api/httpbody.HttpBody in pkg:golang/google.golang.org/genproto/googleapis/api@v0.0.0-20260406210006-6f92a3bedf2d","kind":"HOW","packages":["pkg:golang/google.golang.org/genproto/googleapis/api@v0.0.0-20260406210006-6f92a3bedf2d"],"schemaVersion":1,"symbols":["google.golang.org/genproto/googleapis/api/httpbody.HttpBody"]},"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/google.golang.org/genproto/googleapis/api@v0.0.0-20260406210006-6f92a3bedf2d"],"schemaVersion":1,"subject":"pkg:golang/google.golang.org/genproto/googleapis/api@v0.0.0-20260406210006-6f92a3bedf2d","symbols":["google.golang.org/genproto/googleapis/api/httpbody.HttpBody"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.25.0

require (
	google.golang.org/genproto/googleapis/api v0.0.0-20260406210006-6f92a3bedf2d
	google.golang.org/protobuf v1.36.11
)

github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
google.golang.org/genproto/googleapis/api v0.0.0-20260406210006-6f92a3bedf2d h1:/aDRtSZJjyLQzm75d+a1wOJaqyKBMvIAfeQmoa3ORiI=
google.golang.org/genproto/googleapis/api v0.0.0-20260406210006-6f92a3bedf2d/go.mod h1:etfGUgejTiadZAUaEP14NP97xi1RGeawqkjDARA/UOs=
google.golang.org/protobuf v1.36.11 h1:fV6ZwhNocDyBLK0dj+fg8ektcVegBBuEolpbTQyBNVE=
google.golang.org/protobuf v1.36.11/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=

package main

import (
	"bytes"
	"fmt"
	"log"

	"google.golang.org/genproto/googleapis/api/httpbody"
	"google.golang.org/protobuf/proto"
	"google.golang.org/protobuf/types/known/anypb"
)

func main() {
	// Create an HttpBody representing an HTTP payload with metadata
	metaBody := &httpbody.HttpBody{
		ContentType: "text/plain",
		Data:        []byte("metadata payload"),
	}
	metaAny, err := anypb.New(metaBody)
	if err != nil {
		log.Fatalf("failed to create anypb extension: %v", err)
	}

	body := &httpbody.HttpBody{
		ContentType: "application/json",
		Data:        []byte(`{"status":"success","items":[1,2,3]}`),
		Extensions:  []*anypb.Any{metaAny},
	}

	data, err := proto.Marshal(body)
	if err != nil {
		log.Fatalf("failed to marshal HttpBody: %v", err)
	}

	var decoded httpbody.HttpBody
	if err := proto.Unmarshal(data, &decoded); err != nil {
		log.Fatalf("failed to unmarshal HttpBody: %v", err)
	}

	fmt.Printf("Content-Type: %s\n", decoded.GetContentType())
	fmt.Printf("Data: %s\n", string(decoded.GetData()))
	fmt.Printf("Extensions count: %d\n", len(decoded.GetExtensions()))
	if !bytes.Equal(decoded.GetData(), body.GetData()) {
		log.Fatalf("decoded data mismatch")
	}
}

{
  "schemaVersion": 1,
  "goal": "verify google.golang.org/genproto/googleapis/api/httpbody.HttpBody in pkg:golang/google.golang.org/genproto/googleapis/api@v0.0.0-20260406210006-6f92a3bedf2d",
  "kind": "HOW",
  "packages": [
    "pkg:golang/google.golang.org/genproto/googleapis/api@v0.0.0-20260406210006-6f92a3bedf2d"
  ],
  "symbols": [
    "google.golang.org/genproto/googleapis/api/httpbody.HttpBody"
  ]
}

package main

import (
	"bytes"
	"fmt"
	"os"

	"google.golang.org/genproto/googleapis/api/httpbody"
	"google.golang.org/protobuf/proto"
	"google.golang.org/protobuf/types/known/anypb"
)

func assert(condition bool, message string) {
	if !condition {
		fmt.Fprintf(os.Stderr, "Assertion failed: %s\n", message)
		os.Exit(1)
	}
}

func main() {
	// 1. httpbody.HttpBody encapsulates raw payload bytes with HTTP content-type header string
	payload := []byte(`{"name":"test-resource","count":42}`)
	body := &httpbody.HttpBody{
		ContentType: "application/json",
		Data:        payload,
	}
	assert(body.GetContentType() == "application/json", "ContentType must match initial value")
	assert(bytes.Equal(body.GetData(), payload), "Data must match payload bytes")
	assert(len(body.GetExtensions()) == 0, "Extensions must be empty by default")

	// 2. httpbody.HttpBody serializes and deserializes accurately with protobuf wire format
	wireData, err := proto.Marshal(body)
	assert(err == nil, "proto.Marshal(body) must succeed")
	assert(len(wireData) > 0, "marshaled bytes must not be empty")

	var decoded httpbody.HttpBody
	err = proto.Unmarshal(wireData, &decoded)
	assert(err == nil, "proto.Unmarshal(wireData) must succeed")
	assert(decoded.GetContentType() == body.GetContentType(), "decoded ContentType must match")
	assert(bytes.Equal(decoded.GetData(), body.GetData()), "decoded Data must match original bytes")
	assert(len(decoded.GetExtensions()) == 0, "decoded Extensions must remain empty")

	// 3. httpbody.HttpBody stores arbitrary application metadata extensions as protobuf Any messages
	nested := &httpbody.HttpBody{
		ContentType: "text/plain",
		Data:        []byte("extension-data"),
	}
	extAny, err := anypb.New(nested)
	assert(err == nil, "anypb.New(nested) must succeed")

	bodyWithExt := &httpbody.HttpBody{
		ContentType: "application/octet-stream",
		Data:        []byte{0xDE, 0xAD, 0xBE, 0xEF},
		Extensions:  []*anypb.Any{extAny},
	}
	assert(len(bodyWithExt.GetExtensions()) == 1, "Extensions length must be 1")

	extWire, err := proto.Marshal(bodyWithExt)
	assert(err == nil, "proto.Marshal(bodyWithExt) must succeed")

	var decodedWithExt httpbody.HttpBody
	err = proto.Unmarshal(extWire, &decodedWithExt)
	assert(err == nil, "proto.Unmarshal(extWire) must succeed")
	assert(len(decodedWithExt.GetExtensions()) == 1, "decoded Extensions length must be 1")

	var unmarshaledExt httpbody.HttpBody
	err = anypb.UnmarshalTo(decodedWithExt.GetExtensions()[0], &unmarshaledExt, proto.UnmarshalOptions{})
	assert(err == nil, "anypb.UnmarshalTo must succeed for decoded extension")
	assert(unmarshaledExt.GetContentType() == "text/plain", "unmarshaled extension ContentType must match")
	assert(bytes.Equal(unmarshaledExt.GetData(), []byte("extension-data")), "unmarshaled extension Data must match")

	// 4. httpbody.HttpBody provides safe getters with default values for empty and nil instances
	emptyBody := &httpbody.HttpBody{}
	assert(emptyBody.GetContentType() == "", "emptyBody.GetContentType() must return empty string")
	assert(emptyBody.GetData() == nil, "emptyBody.GetData() must return nil")
	assert(emptyBody.GetExtensions() == nil, "emptyBody.GetExtensions() must return nil")

	var nilBody *httpbody.HttpBody
	assert(nilBody.GetContentType() == "", "nilBody.GetContentType() must return empty string")
	assert(nilBody.GetData() == nil, "nilBody.GetData() must return nil")
	assert(nilBody.GetExtensions() == nil, "nilBody.GetExtensions() must return nil")

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