chore(middleware-apply-body-checksum): use arrow functions (#2560)

Author: trivikr

packages/middleware-apply-body-checksum/src/applyMd5BodyChecksumMiddleware.ts

@@ -13,37 +13,37 @@ import {
 
 import { Md5BodyChecksumResolvedConfig } from "./md5Configuration";
 
-export function applyMd5BodyChecksumMiddleware(options: Md5BodyChecksumResolvedConfig): BuildMiddleware<any, any> {
-  return <Output extends MetadataBearer>(next: BuildHandler<any, Output>): BuildHandler<any, Output> =>
-    async (args: BuildHandlerArguments<any>): Promise<BuildHandlerOutput<Output>> => {
-      let { request } = args;
-      if (HttpRequest.isInstance(request)) {
-        const { body, headers } = request;
-        if (!hasHeader("Content-MD5", headers)) {
-          let digest: Promise<Uint8Array>;
-          if (body === undefined || typeof body === "string" || ArrayBuffer.isView(body) || isArrayBuffer(body)) {
-            const hash = new options.md5();
-            hash.update(body || "");
-            digest = hash.digest();
-          } else {
-            digest = options.streamHasher(options.md5, body);
-          }
-
-          request = {
-            ...request,
-            headers: {
-              ...headers,
-              "Content-MD5": options.base64Encoder(await digest),
-            },
-          };
+export const applyMd5BodyChecksumMiddleware =
+  (options: Md5BodyChecksumResolvedConfig): BuildMiddleware<any, any> =>
+  <Output extends MetadataBearer>(next: BuildHandler<any, Output>): BuildHandler<any, Output> =>
+  async (args: BuildHandlerArguments<any>): Promise<BuildHandlerOutput<Output>> => {
+    let { request } = args;
+    if (HttpRequest.isInstance(request)) {
+      const { body, headers } = request;
+      if (!hasHeader("Content-MD5", headers)) {
+        let digest: Promise<Uint8Array>;
+        if (body === undefined || typeof body === "string" || ArrayBuffer.isView(body) || isArrayBuffer(body)) {
+          const hash = new options.md5();
+          hash.update(body || "");
+          digest = hash.digest();
+        } else {
+          digest = options.streamHasher(options.md5, body);
         }
+
+        request = {
+          ...request,
+          headers: {
+            ...headers,
+            "Content-MD5": options.base64Encoder(await digest),
+          },
+        };
       }
-      return next({
-        ...args,
-        request,
-      });
-    };
-}
+    }
+    return next({
+      ...args,
+      request,
+    });
+  };
 
 export const applyMd5BodyChecksumMiddlewareOptions: BuildHandlerOptions = {
   name: "applyMd5BodyChecksumMiddleware",
@@ -58,7 +58,7 @@ export const getApplyMd5BodyChecksumPlugin = (config: Md5BodyChecksumResolvedCon
   },
 });
 
-function hasHeader(soughtHeader: string, headers: HeaderBag): boolean {
+const hasHeader = (soughtHeader: string, headers: HeaderBag): boolean => {
   soughtHeader = soughtHeader.toLowerCase();
   for (const headerName of Object.keys(headers)) {
     if (soughtHeader === headerName.toLowerCase()) {
@@ -67,4 +67,4 @@ function hasHeader(soughtHeader: string, headers: HeaderBag): boolean {
   }
 
   return false;
-}
+};

packages/middleware-apply-body-checksum/src/md5Configuration.ts

@@ -6,6 +6,7 @@ interface PreviouslyResolved {
   base64Encoder: Encoder;
   streamHasher: StreamHasher<any>;
 }
+
 export interface Md5BodyChecksumResolvedConfig {
   /**
    * A constructor for a class implementing the @aws-sdk/types.Hash interface that computes MD5 hashes.
@@ -23,10 +24,7 @@ export interface Md5BodyChecksumResolvedConfig {
    */
   streamHasher: StreamHasher<any>;
 }
-export function resolveMd5BodyChecksumConfig<T>(
+
+export const resolveMd5BodyChecksumConfig = <T>(
   input: T & PreviouslyResolved & Md5BodyChecksumInputConfig
-): T & Md5BodyChecksumResolvedConfig {
-  return {
-    ...input,
-  };
-}
+): T & Md5BodyChecksumResolvedConfig => input;