feat(middleware-flexible-checksums): use Node.js native CRC32 checksum API

packages/middleware-flexible-checksums/package.json

@@ -17,10 +17,13 @@
   "main": "./dist-cjs/index.js",
   "module": "./dist-es/index.js",
   "browser": {
+    "./dist-es/getCrc32ChecksumAlgorithmFunction": "./dist-es/getCrc32ChecksumAlgorithmFunction.browser",
     "./dist-es/streams/create-read-stream-on-buffer": "./dist-es/streams/create-read-stream-on-buffer.browser"
   },
   "react-native": {
+    "./dist-es/getCrc32ChecksumAlgorithmFunction": "./dist-es/getCrc32ChecksumAlgorithmFunction.browser",
     "./dist-es/streams/create-read-stream-on-buffer": "./dist-es/streams/create-read-stream-on-buffer.browser",
+    "./dist-cjs/getCrc32ChecksumAlgorithmFunction": "./dist-cjs/getCrc32ChecksumAlgorithmFunction.browser",
     "./dist-cjs/streams/create-read-stream-on-buffer": "./dist-cjs/streams/create-read-stream-on-buffer.browser"
   },
   "types": "./dist-types/index.d.ts",
@@ -32,6 +35,7 @@
   "dependencies": {
     "@aws-crypto/crc32": "5.2.0",
     "@aws-crypto/crc32c": "5.2.0",
+    "@aws-crypto/util": "5.2.0",
     "@aws-sdk/core": "*",
     "@aws-sdk/types": "*",
     "@smithy/is-array-buffer": "^3.0.0",

packages/middleware-flexible-checksums/src/getCrc32ChecksumAlgorithmFunction.browser.ts

@@ -0,0 +1,3 @@
+import { AwsCrc32 } from "@aws-crypto/crc32";
+
+export const getCrc32ChecksumAlgorithmFunction = () => AwsCrc32;

packages/middleware-flexible-checksums/src/getCrc32ChecksumAlgorithmFunction.spec.ts

@@ -0,0 +1,47 @@
+import { AwsCrc32 } from "@aws-crypto/crc32";
+import { numToUint8 } from "@aws-crypto/util";
+import { describe, expect, test as it, vi } from "vitest";
+import * as zlib from "zlib";
+
+import { getCrc32ChecksumAlgorithmFunction } from "./getCrc32ChecksumAlgorithmFunction";
+
+describe(getCrc32ChecksumAlgorithmFunction.name, () => {
+  it("returns AwsCrc32 if zlib.crc32 is undefined", () => {
+    vi.mock("zlib", () => ({ crc32: undefined }));
+    expect(getCrc32ChecksumAlgorithmFunction()).toBe(AwsCrc32);
+  });
+
+  it("returns NodeCrc32 if zlib.crc32 is defined", async () => {
+    const mockData = new Uint8Array([1, 2, 3]);
+    const mockChecksum = 42;
+
+    // @ts-expect-error crc32 is defined only for Node.js >=v20.15.0 and >=v22.2.0.
+    zlib.crc32 = vi
+      .fn()
+      .mockReturnValueOnce(mockChecksum)
+      .mockReturnValueOnce(2 * mockChecksum);
+
+    const crc32Fn = getCrc32ChecksumAlgorithmFunction();
+    expect(crc32Fn).not.toBe(AwsCrc32);
+
+    // @ts-expect-error crc32 is defined only for Node.js >=v20.15.0 and >=v22.2.0.
+    expect(zlib.crc32).not.toHaveBeenCalled();
+    const crc32 = new crc32Fn();
+    // @ts-expect-error crc32 is defined only for Node.js >=v20.15.0 and >=v22.2.0.
+    expect(zlib.crc32).not.toHaveBeenCalled();
+    expect(await crc32.digest()).toEqual(numToUint8(0));
+
+    crc32.update(mockData);
+    // @ts-expect-error crc32 is defined only for Node.js >=v20.15.0 and >=v22.2.0.
+    expect(zlib.crc32).toHaveBeenCalledWith(mockData, 0);
+    expect(await crc32.digest()).toEqual(numToUint8(mockChecksum));
+
+    crc32.update(mockData);
+    // @ts-expect-error crc32 is defined only for Node.js >=v20.15.0 and >=v22.2.0.
+    expect(zlib.crc32).toHaveBeenCalledWith(mockData, mockChecksum);
+    expect(await crc32.digest()).toEqual(numToUint8(2 * mockChecksum));
+
+    crc32.reset();
+    expect(await crc32.digest()).toEqual(numToUint8(0));
+  });
+});

packages/middleware-flexible-checksums/src/getCrc32ChecksumAlgorithmFunction.ts

@@ -0,0 +1,28 @@
+import { AwsCrc32 } from "@aws-crypto/crc32";
+import { numToUint8 } from "@aws-crypto/util";
+import { Checksum } from "@smithy/types";
+import * as zlib from "zlib";
+
+export const getCrc32ChecksumAlgorithmFunction = () => {
+  // @ts-expect-error crc32 is defined only for Node.js >=v20.15.0 and >=v22.2.0.
+  if (typeof zlib.crc32 === "undefined") {
+    return AwsCrc32;
+  }
+
+  return class NodeCrc32 implements Checksum {
+    checksum = 0;
+
+    update(data: Uint8Array) {
+      // @ts-expect-error crc32 is defined only for Node.js >=v20.15.0 and >=v22.2.0.
+      this.checksum = zlib.crc32(data, this.checksum);
+    }
+
+    async digest() {
+      return numToUint8(this.checksum);
+    }
+
+    reset() {
+      this.checksum = 0;
+    }
+  };
+};

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

@@ -1,9 +1,9 @@
-import { AwsCrc32 } from "@aws-crypto/crc32";
 import { AwsCrc32c } from "@aws-crypto/crc32c";
 import { ChecksumConstructor, HashConstructor } from "@smithy/types";
 
 import { PreviouslyResolved } from "./configuration";
 import { ChecksumAlgorithm } from "./constants";
+import { getCrc32ChecksumAlgorithmFunction } from "./getCrc32ChecksumAlgorithmFunction";
 
 /**
  * Returns the function that will compute the checksum for the given {@link ChecksumAlgorithm}.
@@ -14,7 +14,7 @@ export const selectChecksumAlgorithmFunction = (
 ): ChecksumConstructor | HashConstructor =>
   ({
     [ChecksumAlgorithm.MD5]: config.md5,
-    [ChecksumAlgorithm.CRC32]: AwsCrc32,
+    [ChecksumAlgorithm.CRC32]: getCrc32ChecksumAlgorithmFunction(),
     [ChecksumAlgorithm.CRC32C]: AwsCrc32c,
     [ChecksumAlgorithm.SHA1]: config.sha1,
     [ChecksumAlgorithm.SHA256]: config.sha256,

yarn.lock

@@ -74,7 +74,7 @@
   dependencies:
     tslib "^2.6.2"
 
-"@aws-crypto/util@^5.2.0":
+"@aws-crypto/util@5.2.0", "@aws-crypto/util@^5.2.0":
   version "5.2.0"
   resolved "https://registry.npmjs.org/@aws-crypto/util/-/util-5.2.0.tgz"
   integrity sha512-4RkU9EsI6ZpBve5fseQlGNUWKMa1RLPQ1dnjnQoe07ldfIzcsGb5hC5W0Dm7u423KWzawlrpbjXBrXCEv9zazQ==