Generate an accurate S3 ETAG for multipart uploads in Node.js. 

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s3-etag

Generate an accurate S3 ETAG for multipart uploads in Node.js

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		{
		"name": "s3-etag",
		"version": "0.0.6",
		"version": "0.0.7",
		"private": false,
		"description": "Generate an S3 ETAG for multipart uploads in Node.js",
		"description": "Generate an accurate S3 ETAG for multipart uploads in Node.js",
		"exports": "./index.js",
		@@ -7,0 +7,0 @@ "type": "module",

		@@ -21,9 +21,24 @@ # S3 ETAG

		// Simple MD5 hash of contents for non-multipart files
		const etag = generateETag(absoluteFilePath);

		expect(etag).toBe('ba0b9fe20dc67b0e4c478ab3c03dc5ce');
		// MD5 hash of combined contents & part number (see below) for multipart files
		const partSizeInBytes = 10 * 1024 * 1024; // 10mb
		const etag = generateETag(absoluteFilePath, partSizeInBytes);
		```

		## How It Works

		This is a Node.js implementation of [this algorithm](https://stackoverflow.com/a/19896823/492325).

		At a high level:

		- If no `partSizeInBytes` is specified, return MD5 hash of file contents
		- If `partSizeInBytes` is specified:
		- Generate parts by comparing `partSizeInBytes` to the file size
		- Read each part from the file, MD5 hash the part, and append it to a global combined hash
		- Once all parts are processed, generate a new MD5 from the global combined hash, and suffix with the amount of parts

		## License

		See [LICENSE.md](./LICENSE.md).

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