Add fallback when AWS SDK returns invalid FIPS endpoint when global UseFIPSEndpoint is set

.changelog/38057.txt

@@ -0,0 +1,3 @@
+```release-note:bug
+provider: Now falls back to non-FIPS endpoint if `use_fips_endpoint` is set and no FIPS endpoint is available
+```

docs/add-a-new-service.md

@@ -93,14 +93,22 @@ If an AWS service must be created in a non-standard way, for example, the servic
     func (p *servicePackage) NewClient(ctx context.Context, config map[string]any) (*costoptimizationhub.Client, error) {
         cfg := *(config["aws_sdkv2_config"].(*aws.Config))
 
-        return costoptimizationhub.NewFromConfig(cfg, func(o *costoptimizationhub.Options) {
-            if endpoint := config["endpoint"].(string); endpoint != "" {
-                o.BaseEndpoint = aws.String(endpoint)
-            } else if config["partition"].(string) == names.StandardPartitionID {
-                // Cost Optimization Hub endpoint is available only in us-east-1 Region.
-                o.Region = names.USEast1RegionID
-            }
-        }), nil
+        return costoptimizationhub.NewFromConfig(cfg,
+            costoptimizationhub.WithEndpointResolverV2(newEndpointResolverSDKv2()),
+            withBaseEndpoint(config[names.AttrEndpoint].(string)),
+            func(o *costoptimizationhub.Options) {
+                if config["partition"].(string) == names.StandardPartitionID {
+                    // Cost Optimization Hub endpoint is available only in us-east-1 Region.
+                    if cfg.Region != names.USEast1RegionID {
+                        tflog.Info(ctx, "overriding region", map[string]any{
+                            "original_region": cfg.Region,
+                            "override_region": names.USEast1RegionID,
+                        })
+                        o.Region = names.USEast1RegionID
+                    }
+                }
+            },
+        ), nil
     }
     ```
 
@@ -121,11 +129,27 @@ If an AWS service must be created in a non-standard way, for example, the servic
     // NewConn returns a new AWS SDK for Go v1 client for this service package's AWS API.
     func (p *servicePackage) NewConn(ctx context.Context) (*globalaccelerator_sdkv1.GlobalAccelerator, error) {
         sess := p.config["session"].(*session_sdkv1.Session)
-        config := &aws_sdkv1.Config{Endpoint: aws_sdkv1.String(p.config["endpoint"].(string))}
+
+        cfg := aws.Config{}
+
+        if endpoint := config[names.AttrEndpoint].(string); endpoint != "" {
+            tflog.Debug(ctx, "setting endpoint", map[string]any{
+                "tf_aws.endpoint": endpoint,
+            })
+            cfg.Endpoint = aws.String(endpoint)
+        } else {
+            cfg.EndpointResolver = newEndpointResolverSDKv1(ctx)
+        }
 
         // Force "global" services to correct Regions.
-        if p.config["partition"].(string) == endpoints_sdkv1.AwsPartitionID {
-            config.Region = aws_sdkv1.String(endpoints_sdkv1.UsWest2RegionID)
+        if config["partition"].(string) == endpoints.AwsPartitionID {
+            if aws.StringValue(cfg.Region) != endpoints.UsWest2RegionID {
+                tflog.Info(ctx, "overriding region", map[string]any{
+                    "original_region": aws.StringValue(cfg.Region),
+                    "override_region": endpoints.UsWest2RegionID,
+                })
+                cfg.Region = aws.String(endpoints.UsWest2RegionID)
+            }
         }
 
         return globalaccelerator_sdkv1.New(sess.Copy(config)), nil

docs/retries-and-waiters.md

@@ -85,16 +85,20 @@ When custom service client configurations are applied, these will be defined in
     func (p *servicePackage) NewClient(ctx context.Context, config map[string]any) (*s3_sdkv2.Client, error) {
     	cfg := *(config["aws_sdkv2_config"].(*aws_sdkv2.Config))
 
-    	return s3_sdkv2.NewFromConfig(cfg, func(o *s3_sdkv2.Options) {
-            // ..other configuration..
-
-    		o.Retryer = conns.AddIsErrorRetryables(cfg.Retryer().(aws_sdkv2.RetryerV2), retry_sdkv2.IsErrorRetryableFunc(func(err error) aws_sdkv2.Ternary {
-    			if tfawserr_sdkv2.ErrMessageContains(err, errCodeOperationAborted, "A conflicting conditional operation is currently in progress against this resource. Please try again.") {
-    				return aws_sdkv2.TrueTernary
-    			}
-    			return aws_sdkv2.UnknownTernary // Delegate to configured Retryer.
-    		}))
-    	}), nil
+    	return s3_sdkv2.NewFromConfig(cfg,
+			s3.WithEndpointResolverV2(newEndpointResolverSDKv2()),
+			withBaseEndpoint(config[names.AttrEndpoint].(string)),
+			func(o *s3_sdkv2.Options) {
+				// ..other configuration..
+
+				o.Retryer = conns.AddIsErrorRetryables(cfg.Retryer().(aws_sdkv2.RetryerV2), retry_sdkv2.IsErrorRetryableFunc(func(err error) aws_sdkv2.Ternary {
+					if tfawserr_sdkv2.ErrMessageContains(err, errCodeOperationAborted, "A conflicting conditional operation is currently in progress against this resource. Please try again.") {
+						return aws_sdkv2.TrueTernary
+					}
+					return aws_sdkv2.UnknownTernary // Delegate to configured Retryer.
+				}))
+			},
+		), nil
     }
     ```
 

internal/generate/serviceendpointtests/file.gtpl

@@ -10,9 +10,8 @@ import (
 	{{- end }}
 	"fmt"
 	"maps"
-	{{- if and (ne .GoV1Package "") (eq .GoV2Package "") }}
+	"net"
 	"net/url"
-	{{- end }}
 	"os"
 	"path/filepath"
 	"strings"
@@ -133,7 +132,7 @@ func TestEndpointConfiguration(t *testing.T) { //nolint:paralleltest // uses t.S
 	testcases := map[string]endpointTestCase{
 		"no config": {
 			with:     []setupFunc{withNoConfig},
-			expected: expectDefaultEndpoint(expectedEndpointRegion),
+			expected: expectDefaultEndpoint(t, expectedEndpointRegion),
 		},
 
 		// Package name endpoint on Config
@@ -474,7 +473,7 @@ func TestEndpointConfiguration(t *testing.T) { //nolint:paralleltest // uses t.S
 			with: []setupFunc{
 				withUseFIPSInConfig,
 			},
-			expected: expectDefaultFIPSEndpoint(expectedEndpointRegion),
+			expected: expectDefaultFIPSEndpoint(t, expectedEndpointRegion),
 		},
 
 		"use fips config with package name endpoint config": {
@@ -517,22 +516,22 @@ func TestEndpointConfiguration(t *testing.T) { //nolint:paralleltest // uses t.S
 	{{ end -}}
 }
 
-func defaultEndpoint(region string) string {
+func defaultEndpoint(region string) (url.URL, error) {
 {{- if ne .GoV2Package "" }}
 	r := {{ .GoV2Package }}_sdkv2.NewDefaultEndpointResolverV2()
 
 	ep, err := r.ResolveEndpoint(context.Background(), {{ .GoV2Package }}_sdkv2.EndpointParameters{
 		Region: aws_sdkv2.String(region),
 	})
 	if err != nil {
-		return err.Error()
+		return url.URL{}, err
 	}
 
 	if ep.URI.Path == "" {
 		ep.URI.Path = "/"
 	}
 
-	return ep.URI.String()
+	return ep.URI, nil
 {{ else }}
 	r := endpoints.DefaultResolver()
 
@@ -543,7 +542,7 @@ func defaultEndpoint(region string) string {
 	{{- end -}}
 	)
 	if err != nil {
-		return err.Error()
+		return url.URL{}, err
 	}
 
 	url, _ := url.Parse(ep.URL)
@@ -552,11 +551,11 @@ func defaultEndpoint(region string) string {
 		url.Path = "/"
 	}
 
-	return url.String()
+	return *url, nil
 {{ end -}}
 }
 
-func defaultFIPSEndpoint(region string) string {
+func defaultFIPSEndpoint(region string) (url.URL, error) {
 {{- if ne .GoV2Package "" }}
 	r := {{ .GoV2Package }}_sdkv2.NewDefaultEndpointResolverV2()
 
@@ -565,14 +564,14 @@ func defaultFIPSEndpoint(region string) string {
 		UseFIPS: aws_sdkv2.Bool(true),
 	})
 	if err != nil {
-		return err.Error()
+		return url.URL{}, err
 	}
 
 	if ep.URI.Path == "" {
 		ep.URI.Path = "/"
 	}
 
-	return ep.URI.String()
+	return ep.URI, nil
 {{ else }}
 	r := endpoints.DefaultResolver()
 
@@ -581,7 +580,7 @@ func defaultFIPSEndpoint(region string) string {
 		opt.UseFIPSEndpoint = endpoints.FIPSEndpointStateEnabled
 	})
 	if err != nil {
-		return err.Error()
+		return url.URL{}, err
 	}
 
 	url, _ := url.Parse(ep.URL)
@@ -590,7 +589,7 @@ func defaultFIPSEndpoint(region string) string {
 		url.Path = "/"
 	}
 
-	return url.String()
+	return *url, nil
 {{ end -}}
 }
 
@@ -716,16 +715,38 @@ func withUseFIPSInConfig(setup *caseSetup) {
 	setup.config["use_fips_endpoint"] = true
 }
 
-func expectDefaultEndpoint(region string) caseExpectations {
+func expectDefaultEndpoint(t *testing.T, region string) caseExpectations {
+	t.Helper()
+
+	endpoint, err := defaultEndpoint(region)
+	if err != nil {
+		t.Fatalf("resolving accessanalyzer default endpoint: %s", err)
+	}
+
 	return caseExpectations{
-		endpoint: defaultEndpoint(region),
+		endpoint: endpoint.String(),
 		region:   expectedCallRegion,
 	}
 }
 
-func expectDefaultFIPSEndpoint(region string) caseExpectations {
-	return caseExpectations{
-		endpoint: defaultFIPSEndpoint(region),
+func expectDefaultFIPSEndpoint(t *testing.T, region string) caseExpectations {
+	t.Helper()
+
+	endpoint, err := defaultFIPSEndpoint(region)
+	if err != nil {
+		t.Fatalf("resolving accessanalyzer FIPS endpoint: %s", err)
+	}
+
+	hostname := endpoint.Hostname()
+	_, err = net.LookupHost(hostname)
+	if dnsErr, ok := errs.As[*net.DNSError](err); ok && dnsErr.IsNotFound {
+		return expectDefaultEndpoint(t, region)
+	} else if err != nil {
+		t.Fatalf("looking up accessanalyzer endpoint %q: %s", hostname, err)
+	}
+
+ 	return caseExpectations{
+		endpoint: endpoint.String(),
 		region:   expectedCallRegion,
 	}
 }