github.com/aws/aws-lambda-go v1.13.3: events.APIGatewayProxyRequest

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 github.com/aws/aws-lambda-go/events.APIGatewayProxyRequest in pkg:golang/github.com/aws/aws-lambda-go@v1.13.3
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/github.com/aws/aws-lambda-go@v1.13.3
Demonstrate these symbols/APIs:
  - github.com/aws/aws-lambda-go/events.APIGatewayProxyRequest

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:e88b03934860ec97cf0277f2b8c779c03b7d22e0d4eaaa93bfa0b526db227fa5","contract":["events.APIGatewayProxyRequest unmarshals API Gateway proxy JSON payloads including resource, path, httpMethod, headers, multiValueHeaders, queryStringParameters, multiValueQueryStringParameters, pathParameters, stageVariables, requestContext, body, and isBase64Encoded","events.APIGatewayProxyRequest round-trips cleanly through json.Marshal and json.Unmarshal preserving path, method, parameters, and request context"],"goal":"verify github.com/aws/aws-lambda-go/events.APIGatewayProxyRequest in pkg:golang/github.com/aws/aws-lambda-go@v1.13.3","kind":"HOW","packages":["pkg:golang/github.com/aws/aws-lambda-go@v1.13.3"],"schemaVersion":1,"symbols":["github.com/aws/aws-lambda-go/events.APIGatewayProxyRequest"]},"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/github.com/aws/aws-lambda-go@v1.13.3"],"schemaVersion":1,"subject":"pkg:golang/github.com/aws/aws-lambda-go@v1.13.3","symbols":["github.com/aws/aws-lambda-go/events.APIGatewayProxyRequest"],"verifierAdapter":"golang@1"}

module sample

go 1.21

require github.com/aws/aws-lambda-go v1.13.3

github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
github.com/aws/aws-lambda-go v1.13.3 h1:SuCy7H3NLyp+1Mrfp+m80jcbi9KYWAs9/BXwppwRDzY=
github.com/aws/aws-lambda-go v1.13.3/go.mod h1:4UKl9IzQMoD+QF79YdCuzCwp8VbmG4VAQwij/eHl5CU=
github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeVRXNmyL/1OwPU0+IJeTBvfc=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=
github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
github.com/urfave/cli v1.22.1/go.mod h1:Gos4lmkARVdJ6EkW0WaNv/tZAAMe9V7XWyB60NtXRu0=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

{
  "schemaVersion": 1,
  "goal": "verify github.com/aws/aws-lambda-go/events.APIGatewayProxyRequest in pkg:golang/github.com/aws/aws-lambda-go@v1.13.3",
  "kind": "HOW",
  "packages": [
    "pkg:golang/github.com/aws/aws-lambda-go@v1.13.3"
  ],
  "symbols": [
    "github.com/aws/aws-lambda-go/events.APIGatewayProxyRequest"
  ]
}

package main

import (
	"encoding/json"
	"os"

	"github.com/aws/aws-lambda-go/events"
)

func main() {
	rawJSON := `{
		"resource": "/items/{id}",
		"path": "/items/42",
		"httpMethod": "POST",
		"headers": {"Content-Type": "application/json"},
		"multiValueHeaders": {"Accept": ["application/json", "text/plain"]},
		"queryStringParameters": {"filter": "active"},
		"multiValueQueryStringParameters": {"tag": ["a", "b"]},
		"pathParameters": {"id": "42"},
		"stageVariables": {"env": "prod"},
		"requestContext": {
			"accountId": "123456789012",
			"resourceId": "res-1",
			"stage": "prod",
			"requestId": "req-1",
			"resourcePath": "/items/{id}",
			"httpMethod": "POST",
			"apiId": "api-1"
		},
		"body": "{\"name\":\"widget\"}",
		"isBase64Encoded": false
	}`

	var req events.APIGatewayProxyRequest
	if err := json.Unmarshal([]byte(rawJSON), &req); err != nil {
		os.Exit(1)
	}

	if req.Resource != "/items/{id}" ||
		req.Path != "/items/42" ||
		req.HTTPMethod != "POST" ||
		req.Headers["Content-Type"] != "application/json" ||
		len(req.MultiValueHeaders["Accept"]) != 2 ||
		req.QueryStringParameters["filter"] != "active" ||
		len(req.MultiValueQueryStringParameters["tag"]) != 2 ||
		req.PathParameters["id"] != "42" ||
		req.StageVariables["env"] != "prod" ||
		req.RequestContext.RequestID != "req-1" ||
		req.RequestContext.Stage != "prod" ||
		req.Body != `{"name":"widget"}` ||
		req.IsBase64Encoded != false {
		os.Exit(1)
	}

	encoded, err := json.Marshal(req)
	if err != nil {
		os.Exit(1)
	}

	var roundTrip events.APIGatewayProxyRequest
	if err := json.Unmarshal(encoded, &roundTrip); err != nil {
		os.Exit(1)
	}

	if roundTrip.Path != req.Path ||
		roundTrip.HTTPMethod != req.HTTPMethod ||
		roundTrip.PathParameters["id"] != "42" ||
		roundTrip.RequestContext.APIID != "api-1" {
		os.Exit(1)
	}
}