fix(client-s3-control): add prefix dedupe middleware

clients/client-s3-control/src/S3ControlClient.ts

@@ -12,6 +12,7 @@ import { getLoggerPlugin } from "@aws-sdk/middleware-logger";
 import { getRecursionDetectionPlugin } from "@aws-sdk/middleware-recursion-detection";
 import { getRetryPlugin, resolveRetryConfig, RetryInputConfig, RetryResolvedConfig } from "@aws-sdk/middleware-retry";
 import {
+  getHostPrefixDeduplicationPlugin,
   resolveS3ControlConfig,
   S3ControlInputConfig,
   S3ControlResolvedConfig,
@@ -569,6 +570,7 @@ export class S3ControlClient extends __Client<
     this.middlewareStack.use(getLoggerPlugin(this.config));
     this.middlewareStack.use(getRecursionDetectionPlugin(this.config));
     this.middlewareStack.use(getAwsAuthPlugin(this.config));
+    this.middlewareStack.use(getHostPrefixDeduplicationPlugin(this.config));
     this.middlewareStack.use(getUserAgentPlugin(this.config));
   }
 

codegen/smithy-aws-typescript-codegen/src/main/java/software/amazon/smithy/aws/typescript/codegen/AddS3ControlDependency.java

@@ -54,6 +54,11 @@ public List<RuntimeClientPlugin> getClientPlugins() {
                         .withConventions(AwsDependency.S3_CONTROL_MIDDLEWARE.dependency, "S3Control", HAS_CONFIG)
                         .servicePredicate((m, s) -> isS3Control(s))
                         .build(),
+                RuntimeClientPlugin.builder()
+                        .withConventions(AwsDependency.S3_CONTROL_MIDDLEWARE.dependency,
+                            "HostPrefixDeduplication", HAS_MIDDLEWARE)
+                        .servicePredicate((m, s) -> isS3Control(s))
+                        .build(),
                 RuntimeClientPlugin.builder()
                         .withConventions(
                             AwsDependency.S3_CONTROL_MIDDLEWARE.dependency,

packages/middleware-sdk-s3-control/src/host-prefix-deduplication/deduplicateHostPrefix.spec.ts

@@ -0,0 +1,17 @@
+import { deduplicateHostPrefix } from "./deduplicateHostPrefix";
+
+describe(deduplicateHostPrefix.name, () => {
+  it("should deduplicate host name prefixes", () => {
+    expect(deduplicateHostPrefix("a.a.host.com")).toEqual("a.host.com");
+    expect(deduplicateHostPrefix("1234567890.1234567890.host.com")).toEqual("1234567890.host.com");
+    expect(deduplicateHostPrefix("abcdefgh.abcdefgh.host.com")).toEqual("abcdefgh.host.com");
+  });
+
+  it("should do nothing if no duplication exists in the first two positions", () => {
+    expect(deduplicateHostPrefix("b.a.host.com")).toEqual("b.a.host.com");
+    expect(deduplicateHostPrefix("0123456789.1234567890.host.com")).toEqual("0123456789.1234567890.host.com");
+    expect(deduplicateHostPrefix("zabcdefg.abcdefgh.host.com")).toEqual("zabcdefg.abcdefgh.host.com");
+
+    expect(deduplicateHostPrefix("12345.abcdefgh.12345.12345.host.com")).toEqual("12345.abcdefgh.12345.12345.host.com");
+  });
+});

packages/middleware-sdk-s3-control/src/host-prefix-deduplication/deduplicateHostPrefix.ts

@@ -0,0 +1,11 @@
+/**
+ * @example
+ * 12345.12345.____.com should become 12345.____.com.
+ */
+export const deduplicateHostPrefix = (hostname: string): string => {
+  const [prefix1, prefix2, ...rest] = hostname.split(".");
+  if (prefix1 === prefix2) {
+    return [prefix1, ...rest].join(".");
+  }
+  return hostname;
+};

packages/middleware-sdk-s3-control/src/host-prefix-deduplication/hostPrefixDeduplicationMiddleware.ts

@@ -0,0 +1,50 @@
+import {
+  HandlerExecutionContext,
+  HttpRequest,
+  Pluggable,
+  RelativeMiddlewareOptions,
+  SerializeHandler,
+  SerializeHandlerArguments,
+  SerializeHandlerOutput,
+  SerializeMiddleware,
+} from "@aws-sdk/types";
+
+import { deduplicateHostPrefix } from "./deduplicateHostPrefix";
+
+/**
+ * @internal
+ * This customization handles an edge case where
+ * a hostprefix may be duplicated in the endpoint ruleset resolution
+ * and hostPrefix serialization via the pre-endpoints 2.0 trait,
+ * and which cannot be reconciled automatically.
+ */
+export const hostPrefixDeduplicationMiddleware = (): SerializeMiddleware<any, any> => {
+  return (next: SerializeHandler<any, any>, context: HandlerExecutionContext): SerializeHandler<any, any> =>
+    async (args: SerializeHandlerArguments<any>): Promise<SerializeHandlerOutput<any>> => {
+      const httpRequest: HttpRequest = (args.request ?? {}) as HttpRequest;
+      if (httpRequest?.hostname) {
+        httpRequest.hostname = deduplicateHostPrefix(httpRequest.hostname);
+      }
+      return next(args);
+    };
+};
+
+/**
+ * @internal
+ */
+export const hostPrefixDeduplicationMiddlewareOptions: RelativeMiddlewareOptions = {
+  tags: ["HOST_PREFIX_DEDUPLICATION", "ENDPOINT_V2", "ENDPOINT"],
+  toMiddleware: "serializerMiddleware",
+  relation: "after",
+  name: "hostPrefixDeduplicationMiddleware",
+  override: true,
+};
+
+/**
+ * @internal
+ */
+export const getHostPrefixDeduplicationPlugin = <T>(config: T): Pluggable<any, any> => ({
+  applyToStack: (clientStack) => {
+    clientStack.addRelativeTo(hostPrefixDeduplicationMiddleware(), hostPrefixDeduplicationMiddlewareOptions);
+  },
+});

packages/middleware-sdk-s3-control/src/index.ts

@@ -6,4 +6,5 @@ export {
   updateArnablesRequestMiddlewareOptions,
   getProcessArnablesPlugin,
 } from "./process-arnables-plugin";
+export * from "./host-prefix-deduplication/hostPrefixDeduplicationMiddleware";
 export * from "./redirect-from-postid";