github.com/aws/aws-sdk-go-v2 v1.47.0: aws.Config

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-sdk-go-v2/aws.Config in pkg:golang/github.com/aws/aws-sdk-go-v2@v1.47.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/github.com/aws/aws-sdk-go-v2@v1.47.0
Demonstrate these symbols/APIs:
  - github.com/aws/aws-sdk-go-v2/aws.Config

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.

package sample

import (
	"context"
	"fmt"

	"github.com/aws/aws-sdk-go-v2/aws"
)

// ConfigOptions defines configuration parameters for building an aws.Config.
type ConfigOptions struct {
	Region           string
	RetryMaxAttempts int
	RetryMode        aws.RetryMode
	AppID            string
	BaseEndpoint     *string
	Credentials      aws.CredentialsProvider
}

// BuildClientConfig constructs and validates an aws.Config with specified options.
func BuildClientConfig(opts ConfigOptions) (aws.Config, error) {
	if opts.Region == "" {
		return aws.Config{}, fmt.Errorf("region cannot be empty")
	}

	cfg := aws.Config{
		Region:           opts.Region,
		RetryMaxAttempts: opts.RetryMaxAttempts,
		RetryMode:        opts.RetryMode,
		AppID:            opts.AppID,
		BaseEndpoint:     opts.BaseEndpoint,
		Credentials:      opts.Credentials,
	}

	return cfg, nil
}

// CloneAndOverrideRegion creates an independent copy of aws.Config with an updated region.
func CloneAndOverrideRegion(cfg aws.Config, newRegion string) (aws.Config, error) {
	if newRegion == "" {
		return aws.Config{}, fmt.Errorf("new region cannot be empty")
	}
	clone := cfg.Copy()
	clone.Region = newRegion
	return clone, nil
}

// CreateStaticCredentialsConfig creates an aws.Config with static credentials.
func CreateStaticCredentialsConfig(region, keyID, secretKey string) (aws.Config, error) {
	if region == "" {
		return aws.Config{}, fmt.Errorf("region cannot be empty")
	}
	provider := aws.CredentialsProviderFunc(func(ctx context.Context) (aws.Credentials, error) {
		return aws.Credentials{
			AccessKeyID:     keyID,
			SecretAccessKey: secretKey,
			Source:          "StaticConfigProvider",
		}, nil
	})

	return BuildClientConfig(ConfigOptions{
		Region:           region,
		Credentials:      provider,
		RetryMaxAttempts: 3,
		RetryMode:        aws.RetryModeStandard,
	})
}

{"case":{"caseId":"case:sha256:365eabae18a54fa184dcbd7b5786a85a4081b73a8ebce53583ef75d86aa4d875","contract":["aws.NewConfig returns a non-nil Config pointer with default values","Config preserves assigned Region, RetryMaxAttempts, RetryMode, and AppID","Config supports custom BaseEndpoint and CredentialsProvider resolution","Config.Copy produces a shallow copy allowing independent region mutation","Config with AnonymousCredentials returns sentinel credentials"],"goal":"verify github.com/aws/aws-sdk-go-v2/aws.Config in pkg:golang/github.com/aws/aws-sdk-go-v2@v1.47.0","kind":"HOW","packages":["pkg:golang/github.com/aws/aws-sdk-go-v2@v1.47.0"],"schemaVersion":1,"symbols":["github.com/aws/aws-sdk-go-v2/aws.Config"]},"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-sdk-go-v2@v1.47.0"],"schemaVersion":1,"subject":"pkg:golang/github.com/aws/aws-sdk-go-v2@v1.47.0","symbols":["github.com/aws/aws-sdk-go-v2/aws.Config"],"verifierAdapter":"golang@1"}

module sample

go 1.26

require github.com/aws/aws-sdk-go-v2 v1.47.0

require github.com/aws/smithy-go v1.28.1 // indirect

github.com/aws/aws-sdk-go-v2 v1.47.0 h1:0jsHallhJCeaU0Ko48c/3FK1ctOQ7NpzggxriJOQ8MQ=
github.com/aws/aws-sdk-go-v2 v1.47.0/go.mod h1:bttEH6JqnUL8LepvDVfdrds/fZ5bCIxzpe3abyUrhDU=
github.com/aws/smithy-go v1.28.1 h1:R/nXH00c8qcfCzQVELtRw+eLQWtzv+VAIEFJ1/xxXlQ=
github.com/aws/smithy-go v1.28.1/go.mod h1:YE2RhdIuDbA5E5bTdciG9KrW3+TiEONeUWCqxX9i1Fc=

{
  "schemaVersion": 1,
  "goal": "verify github.com/aws/aws-sdk-go-v2/aws.Config in pkg:golang/github.com/aws/aws-sdk-go-v2@v1.47.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/github.com/aws/aws-sdk-go-v2@v1.47.0"
  ],
  "symbols": [
    "github.com/aws/aws-sdk-go-v2/aws.Config"
  ]
}

package main

import (
	"context"
	"fmt"
	"os"

	"github.com/aws/aws-sdk-go-v2/aws"
	"sample"
)

func main() {
	if err := runContractTests(); err != nil {
		fmt.Fprintf(os.Stderr, "Contract test failed: %v\n", err)
		os.Exit(1)
	}
	fmt.Println("All aws.Config contract assertions passed.")
}

func runContractTests() error {
	ctx := context.Background()

	// Assertion 1: aws.NewConfig returns a non-nil Config pointer with default values
	{
		cfgPtr := aws.NewConfig()
		if cfgPtr == nil {
			return fmt.Errorf("aws.NewConfig() returned nil pointer")
		}
		if cfgPtr.Region != "" {
			return fmt.Errorf("expected empty initial region, got %q", cfgPtr.Region)
		}
	}

	// Assertion 2: Config preserves assigned Region, RetryMaxAttempts, RetryMode, and AppID
	{
		opts := sample.ConfigOptions{
			Region:           "us-west-2",
			RetryMaxAttempts: 5,
			RetryMode:        aws.RetryModeStandard,
			AppID:            "my-sample-app",
		}
		cfg, err := sample.BuildClientConfig(opts)
		if err != nil {
			return fmt.Errorf("failed to build client config: %w", err)
		}
		if cfg.Region != "us-west-2" {
			return fmt.Errorf("expected Region 'us-west-2', got %q", cfg.Region)
		}
		if cfg.RetryMaxAttempts != 5 {
			return fmt.Errorf("expected RetryMaxAttempts 5, got %d", cfg.RetryMaxAttempts)
		}
		if cfg.RetryMode != aws.RetryModeStandard {
			return fmt.Errorf("expected RetryModeStandard, got %v", cfg.RetryMode)
		}
		if cfg.AppID != "my-sample-app" {
			return fmt.Errorf("expected AppID 'my-sample-app', got %q", cfg.AppID)
		}
	}

	// Assertion 3: Config supports custom BaseEndpoint and CredentialsProvider resolution
	{
		endpoint := "http://localhost:4566"
		cfg, err := sample.CreateStaticCredentialsConfig("eu-west-1", "test-key-id", "test-secret-key")
		if err != nil {
			return fmt.Errorf("failed to create static credentials config: %w", err)
		}
		cfg.BaseEndpoint = aws.String(endpoint)

		if cfg.BaseEndpoint == nil || *cfg.BaseEndpoint != endpoint {
			return fmt.Errorf("expected BaseEndpoint %q, got %v", endpoint, cfg.BaseEndpoint)
		}
		if cfg.Credentials == nil {
			return fmt.Errorf("expected non-nil Credentials provider")
		}

		creds, err := cfg.Credentials.Retrieve(ctx)
		if err != nil {
			return fmt.Errorf("failed to retrieve static credentials: %w", err)
		}
		if creds.AccessKeyID != "test-key-id" {
			return fmt.Errorf("expected AccessKeyID 'test-key-id', got %q", creds.AccessKeyID)
		}
		if creds.SecretAccessKey != "test-secret-key" {
			return fmt.Errorf("expected SecretAccessKey 'test-secret-key', got %q", creds.SecretAccessKey)
		}
	}

	// Assertion 4: Config.Copy produces a shallow copy allowing independent region mutation
	{
		cfg, err := sample.BuildClientConfig(sample.ConfigOptions{
			Region:           "us-east-1",
			RetryMaxAttempts: 2,
		})
		if err != nil {
			return fmt.Errorf("failed to build client config: %w", err)
		}

		copied, err := sample.CloneAndOverrideRegion(cfg, "ap-northeast-1")
		if err != nil {
			return fmt.Errorf("failed to clone and override region: %w", err)
		}
		if copied.Region != "ap-northeast-1" {
			return fmt.Errorf("expected copied region 'ap-northeast-1', got %q", copied.Region)
		}
		if cfg.Region != "us-east-1" {
			return fmt.Errorf("expected original region to remain 'us-east-1', got %q", cfg.Region)
		}
		if copied.RetryMaxAttempts != cfg.RetryMaxAttempts {
			return fmt.Errorf("expected copied RetryMaxAttempts to match original")
		}
	}

	// Assertion 5: Config with AnonymousCredentials returns sentinel credentials
	{
		cfg, err := sample.BuildClientConfig(sample.ConfigOptions{
			Region:      "us-east-2",
			Credentials: aws.AnonymousCredentials{},
		})
		if err != nil {
			return fmt.Errorf("failed to build anonymous config: %w", err)
		}
		creds, err := cfg.Credentials.Retrieve(ctx)
		if err == nil {
			return fmt.Errorf("expected error from AnonymousCredentials.Retrieve, got nil")
		}
		if creds.Source != "AnonymousCredentials" {
			return fmt.Errorf("expected creds.Source 'AnonymousCredentials', got %q", creds.Source)
		}
	}

	return nil
}