feat(middleware-flexible-checksums): support trailing checksums with aws-chunked encoding

packages/middleware-flexible-checksums/src/configuration.ts

@@ -1,4 +1,4 @@
-import { Encoder, HashConstructor, StreamHasher } from "@aws-sdk/types";
+import { Encoder, GetAwsChunkedEncodingStream, HashConstructor, StreamHasher } from "@aws-sdk/types";
 
 export interface PreviouslyResolved {
   /**
@@ -7,6 +7,16 @@ export interface PreviouslyResolved {
    */
   base64Encoder: Encoder;
 
+  /**
+   * A function that can calculate the length of a body.
+   */
+  bodyLengthChecker: (body: any) => number | undefined;
+
+  /**
+   * A function that returns Readable Stream which follows aws-chunked encoding stream.
+   */
+  getAwsChunkedEncodingStream: GetAwsChunkedEncodingStream;
+
   /**
    * A constructor for a class implementing the {@link Hash} interface that computes MD5 hashes.
    * @internal

packages/middleware-flexible-checksums/src/flexibleChecksumsMiddleware.spec.ts

@@ -9,16 +9,18 @@ import { getChecksumAlgorithmForRequest } from "./getChecksumAlgorithmForRequest
 import { getChecksumLocationName } from "./getChecksumLocationName";
 import { FlexibleChecksumsMiddlewareConfig } from "./getFlexibleChecksumsPlugin";
 import { hasHeader } from "./hasHeader";
+import { isStreaming } from "./isStreaming";
 import { selectChecksumAlgorithmFunction } from "./selectChecksumAlgorithmFunction";
 import { validateChecksumFromResponse } from "./validateChecksumFromResponse";
 
 jest.mock("@aws-sdk/protocol-http");
+jest.mock("./getChecksum");
 jest.mock("./getChecksumAlgorithmForRequest");
 jest.mock("./getChecksumLocationName");
-jest.mock("./selectChecksumAlgorithmFunction");
-jest.mock("./getChecksum");
 jest.mock("./hasHeader");
+jest.mock("./isStreaming");
 jest.mock("./validateChecksumFromResponse");
+jest.mock("./selectChecksumAlgorithmFunction");
 
 describe(flexibleChecksumsMiddleware.name, () => {
   const mockNext = jest.fn();
@@ -31,8 +33,8 @@ describe(flexibleChecksumsMiddleware.name, () => {
   const mockConfig = {} as PreviouslyResolved;
   const mockMiddlewareConfig = { input: mockInput } as FlexibleChecksumsMiddlewareConfig;
 
-  const mockBody = {};
-  const mockHeaders = {};
+  const mockBody = { body: "mockBody" };
+  const mockHeaders = { "content-length": 100 };
   const mockRequest = { body: mockBody, headers: mockHeaders };
   const mockArgs = { request: mockRequest } as BuildHandlerArguments<any>;
   const mockResult = { response: {} };
@@ -41,19 +43,20 @@ describe(flexibleChecksumsMiddleware.name, () => {
     mockNext.mockResolvedValueOnce(mockResult);
     const { isInstance } = HttpRequest;
     (isInstance as unknown as jest.Mock).mockReturnValue(true);
+    (getChecksum as jest.Mock).mockReturnValue(mockChecksum);
     (getChecksumAlgorithmForRequest as jest.Mock).mockReturnValue(ChecksumAlgorithm.MD5);
     (getChecksumLocationName as jest.Mock).mockReturnValue(mockChecksumLocationName);
-    (selectChecksumAlgorithmFunction as jest.Mock).mockReturnValue(mockChecksumAlgorithmFunction);
-    (getChecksum as jest.Mock).mockReturnValue(mockChecksum);
     (hasHeader as jest.Mock).mockReturnValue(false);
+    (isStreaming as jest.Mock).mockReturnValue(false);
+    (selectChecksumAlgorithmFunction as jest.Mock).mockReturnValue(mockChecksumAlgorithmFunction);
   });
 
   afterEach(() => {
     expect(mockNext).toHaveBeenCalledTimes(1);
     jest.clearAllMocks();
   });
 
-  describe("skips checksum computation", () => {
+  describe("skips", () => {
     it("if not an instance of HttpRequest", async () => {
       const { isInstance } = HttpRequest;
       (isInstance as unknown as jest.Mock).mockReturnValue(false);
@@ -65,7 +68,6 @@ describe(flexibleChecksumsMiddleware.name, () => {
     describe("request checksum", () => {
       afterEach(() => {
         expect(getChecksumAlgorithmForRequest).toHaveBeenCalledTimes(1);
-        expect(selectChecksumAlgorithmFunction).not.toHaveBeenCalled();
         expect(getChecksum).not.toHaveBeenCalled();
       });
 
@@ -75,6 +77,7 @@ describe(flexibleChecksumsMiddleware.name, () => {
         await handler(mockArgs);
         expect(getChecksumLocationName).not.toHaveBeenCalled();
         expect(mockNext).toHaveBeenCalledWith(mockArgs);
+        expect(selectChecksumAlgorithmFunction).not.toHaveBeenCalled();
       });
 
       it("if header is already present", async () => {
@@ -87,6 +90,7 @@ describe(flexibleChecksumsMiddleware.name, () => {
         (hasHeader as jest.Mock).mockReturnValue(true);
         await handler(mockArgsWithChecksumHeader);
         expect(getChecksumLocationName).toHaveBeenCalledTimes(1);
+        expect(selectChecksumAlgorithmFunction).toHaveBeenCalledTimes(1);
         expect(hasHeader).toHaveBeenCalledTimes(1);
         expect(mockNext).toHaveBeenCalledWith(mockArgsWithChecksumHeader);
         expect(hasHeader).toHaveBeenCalledWith(mockChecksumLocationName, mockHeadersWithChecksumHeader);
@@ -112,21 +116,57 @@ describe(flexibleChecksumsMiddleware.name, () => {
     });
   });
 
-  it("adds checksum in the request header", async () => {
-    const handler = flexibleChecksumsMiddleware(mockConfig, mockMiddlewareConfig)(mockNext, {});
-    await handler(mockArgs);
-    expect(getChecksumLocationName).toHaveBeenCalledTimes(1);
-    expect(hasHeader).toHaveBeenCalledTimes(1);
-    expect(mockNext).toHaveBeenCalledWith({
-      ...mockArgs,
-      request: {
-        ...mockRequest,
-        headers: { ...mockHeaders, [mockChecksumLocationName]: mockChecksum },
-      },
+  describe("adds checksum in the request header", () => {
+    afterEach(() => {
+      expect(getChecksumAlgorithmForRequest).toHaveBeenCalledTimes(1);
+      expect(getChecksumLocationName).toHaveBeenCalledTimes(1);
+      expect(selectChecksumAlgorithmFunction).toHaveBeenCalledTimes(1);
+    });
+
+    it("for streaming body", async () => {
+      (isStreaming as jest.Mock).mockReturnValue(true);
+      const mockUpdatedBody = { body: "mockUpdatedBody" };
+      const mockGetAwsChunkedEncodingStream = jest.fn().mockReturnValue(mockUpdatedBody);
+
+      const handler = flexibleChecksumsMiddleware(
+        { ...mockConfig, getAwsChunkedEncodingStream: mockGetAwsChunkedEncodingStream },
+        mockMiddlewareConfig
+      )(mockNext, {});
+      await handler(mockArgs);
+
+      expect(mockNext).toHaveBeenCalledWith({
+        ...mockArgs,
+        request: {
+          ...mockRequest,
+          headers: {
+            ...mockHeaders,
+            "content-length": undefined,
+            "content-encoding": "aws-chunked",
+            "transfer-encoding": "chunked",
+            "x-amz-decoded-content-length": mockHeaders["content-length"],
+            "x-amz-content-sha256": "STREAMING-UNSIGNED-PAYLOAD-TRAILER",
+            "x-amz-trailer": mockChecksumLocationName,
+          },
+          body: mockUpdatedBody,
+        },
+      });
+      expect(mockGetAwsChunkedEncodingStream).toHaveBeenCalledTimes(1);
+    });
+
+    it("for non-streaming body", async () => {
+      const handler = flexibleChecksumsMiddleware(mockConfig, mockMiddlewareConfig)(mockNext, {});
+      await handler(mockArgs);
+      expect(hasHeader).toHaveBeenCalledTimes(1);
+      expect(mockNext).toHaveBeenCalledWith({
+        ...mockArgs,
+        request: {
+          ...mockRequest,
+          headers: { ...mockHeaders, [mockChecksumLocationName]: mockChecksum },
+        },
+      });
+      expect(hasHeader).toHaveBeenCalledWith(mockChecksumLocationName, mockHeaders);
+      expect(getChecksum).toHaveBeenCalledTimes(1);
     });
-    expect(hasHeader).toHaveBeenCalledWith(mockChecksumLocationName, mockHeaders);
-    expect(selectChecksumAlgorithmFunction).toHaveBeenCalledTimes(1);
-    expect(getChecksum).toHaveBeenCalledTimes(1);
   });
 
   it("validates checksum from the response header", async () => {

packages/middleware-flexible-checksums/src/flexibleChecksumsMiddleware.ts

@@ -13,6 +13,7 @@ import { getChecksumAlgorithmForRequest } from "./getChecksumAlgorithmForRequest
 import { getChecksumLocationName } from "./getChecksumLocationName";
 import { FlexibleChecksumsMiddlewareConfig } from "./getFlexibleChecksumsPlugin";
 import { hasHeader } from "./hasHeader";
+import { isStreaming } from "./isStreaming";
 import { selectChecksumAlgorithmFunction } from "./selectChecksumAlgorithmFunction";
 import { validateChecksumFromResponse } from "./validateChecksumFromResponse";
 
@@ -26,20 +27,38 @@ export const flexibleChecksumsMiddleware =
 
     const { request } = args;
     const { body: requestBody, headers } = request;
-    const { streamHasher, base64Encoder } = config;
+    const { base64Encoder, streamHasher } = config;
     const { input, requestChecksumRequired, requestAlgorithmMember } = middlewareConfig;
 
     const checksumAlgorithm = getChecksumAlgorithmForRequest(input, {
       requestChecksumRequired,
       requestAlgorithmMember,
     });
+    let updatedBody = requestBody;
     let updatedHeaders = headers;
 
     if (checksumAlgorithm) {
       const checksumLocationName = getChecksumLocationName(checksumAlgorithm);
-      // ToDo: Update trailer instead if it is Unsigned-payload.
-      if (!hasHeader(checksumLocationName, headers)) {
-        const checksumAlgorithmFn = selectChecksumAlgorithmFunction(checksumAlgorithm, config);
+      const checksumAlgorithmFn = selectChecksumAlgorithmFunction(checksumAlgorithm, config);
+      if (isStreaming(requestBody)) {
+        const { getAwsChunkedEncodingStream, bodyLengthChecker } = config;
+        updatedBody = getAwsChunkedEncodingStream(requestBody, {
+          base64Encoder,
+          bodyLengthChecker,
+          checksumLocationName,
+          checksumAlgorithmFn,
+          streamHasher,
+        });
+        updatedHeaders = {
+          ...headers,
+          "content-encoding": "aws-chunked",
+          "transfer-encoding": "chunked",
+          "x-amz-decoded-content-length": headers["content-length"],
+          "x-amz-content-sha256": "STREAMING-UNSIGNED-PAYLOAD-TRAILER",
+          "x-amz-trailer": checksumLocationName,
+        };
+        delete updatedHeaders["content-length"];
+      } else if (!hasHeader(checksumLocationName, headers)) {
         const checksum = await getChecksum(requestBody, { streamHasher, checksumAlgorithmFn, base64Encoder });
         updatedHeaders = {
           ...headers,
@@ -53,6 +72,7 @@ export const flexibleChecksumsMiddleware =
       request: {
         ...request,
         headers: updatedHeaders,
+        body: updatedBody,
       },
     });