feat: add localstack endpoint resolver

internal/pkg/aws/sessions/sessions.go

@@ -7,6 +7,7 @@ package sessions
 import (
 	"context"
 	"fmt"
+	"github.com/aws/copilot-cli/internal/pkg/endpoints"
 	"net/http"
 	"runtime"
 	"sync"
@@ -210,7 +211,8 @@ func newConfig() *aws.Config {
 	return aws.NewConfig().
 		WithHTTPClient(c).
 		WithCredentialsChainVerboseErrors(true).
-		WithMaxRetries(maxRetriesOnRecoverableFailures)
+		WithMaxRetries(maxRetriesOnRecoverableFailures).
+		WithEndpointResolver(endpoints.NewResolver())
 }
 
 // userAgentHandler returns a http request handler that sets the AWS Copilot custom user agent to all aws requests.

internal/pkg/endpoints/localstack.go

@@ -0,0 +1,52 @@
+package endpoints
+
+import (
+	"github.com/aws/aws-sdk-go/aws/endpoints"
+	"os"
+	"strings"
+)
+
+type localStackResolver struct {
+	defaultResolver endpoints.Resolver
+}
+
+func getLocalStackUrl() string {
+	hostname := os.Getenv("LOCALSTACK_HOSTNAME")
+
+	if hostname == "" {
+		hostname = "localhost"
+	}
+
+	port := os.Getenv("EDGE_PORT")
+	if port == "" {
+		port = "4566"
+	}
+
+	ssl := os.Getenv("USE_SSL")
+	disableSSL := true
+	if ssl == "1" || strings.ToLower(ssl) == "true" {
+		disableSSL = false
+	}
+
+	return endpoints.AddScheme(hostname + ":" + port, disableSSL)
+}
+
+func (l *localStackResolver) EndpointFor(service, region string, opts ...func(*endpoints.Options)) (endpoints.ResolvedEndpoint, error) {
+	endpointFor, err := l.defaultResolver.EndpointFor(service, region, opts...)
+
+	if err != nil {
+		return endpointFor, err
+	}
+
+	endpointFor.URL = getLocalStackUrl()
+
+	return endpointFor, err
+}
+
+func NewLocalstackResolver() *localStackResolver {
+	resolver := &localStackResolver{
+		defaultResolver: endpoints.DefaultResolver(),
+	}
+
+	return resolver
+}

internal/pkg/endpoints/resolver.go

@@ -0,0 +1,17 @@
+package endpoints
+
+import (
+	"github.com/aws/aws-sdk-go/aws/endpoints"
+	"os"
+	"strings"
+)
+
+func NewResolver() endpoints.Resolver {
+	flag := os.Getenv("LOCALSTACK_DISABLE")
+
+	if flag == "1" || strings.ToLower(flag) == "true" {
+		return endpoints.DefaultResolver()
+	} else {
+		return NewLocalstackResolver()
+	}
+}