CLDSRV-898: handle checksums in CompleteMultipartUpload by leif-scality · Pull Request #6170 · scality/cloudserver

leif-scality · 2026-05-15T21:01:27Z

Calculate and compare the final object checksum with the one sent by the headers
Check that all parts have the correct checksum and checksum type
stores the final checksum when FULL_OBJECT (COMPOSITE are going to be stored by https://scality.atlassian.net/browse/S3C-10399)
lint tests/unit/api/multipartUpload.js

claude · 2026-05-15T21:05:58Z

LGTM

Review by Claude Code

codecov · 2026-05-15T21:06:39Z

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
9216	1	9215	0

View the top 1 failed test(s) by shortest run time

"before each" hook for "should retrieve a part copied from an MPU after the original part was overwritten"::GET object With v4 signature With PartNumber field uploadPartCopy overwrite "before each" hook for "should retrieve a part copied from an MPU after the original part was overwritten"

Stack Traces | 7.88s run time

Connection timed out after 5000 ms

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bert-e · 2026-05-21T13:19:02Z

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bert-e · 2026-05-21T13:19:08Z

Incorrect fix version

The Fix Version/s in issue CLDSRV-898 contains:

None

Considering where you are trying to merge, I ignored possible hotfix versions and I expected to find:

9.4.0

Please check the Fix Version/s of CLDSRV-898, or the target
branch of this pull request.

claude · 2026-05-21T13:28:33Z

LGTM

Well-designed separation of CompleteMPU's final-object checksum semantics from body-digest validation. The callNext double-callback guard in processParts is a good defensive pattern for the mixed callback/promise flow. Test coverage is thorough across all algorithm/type combinations, including edge cases for default MPUs, legacy MPUs, and soft-null vs InternalError distinction.

Review by Claude Code

jonathan-gramain · 2026-05-21T18:47:36Z

+    const parts = jsonList.Part || [];
+    for (let i = 0; i < parts.length; i++) {
+        const part = parts[i];


Suggested change

const parts = jsonList.Part || [];

for (let i = 0; i < parts.length; i++) {

const part = parts[i];

for (const part of (jsonList.Part || [])) {

jonathan-gramain · 2026-05-21T18:49:38Z

+            if (tag !== expectedTag) {
+                const algoLabel = tag.replace(/^Checksum/, '').toLowerCase();
+                return errorInstances.BadDigest.customizeDescription(
+                    `The ${algoLabel} you specified for part ${partNumber} ` + 'did not match what we received.',


Suggested change

`The ${algoLabel} you specified for part ${partNumber} ` + 'did not match what we received.',

`The ${algoLabel} you specified for part ${partNumber} did not match what we received.`,

jonathan-gramain · 2026-05-21T18:57:15Z

There's already a test file multipartUpload.js, wouldn't it be better to add the tests there? Or if a refactor into multiple files is beneficial, maybe port some related tests from there to this new file to avoid scattering the complete MPU tests into multiple files.

moved the tests to multipartUpload.js. This also triggered the new prettier linter in the file, I added it as a separate commit

jonathan-gramain · 2026-05-21T18:59:02Z

+
+// XML element name AWS uses for each algorithm in CompleteMultipartUpload's
+// per-part body.
+const TAG_BY_ALGO = {


Shouldn't this be in constants too?

The algorithms object contains the TAG of each algo already, this object is just for testing that the tag was not changed in the algorithms object

Could you construct it from algorithms? If algorithm is supposed to be a constant and we are concerned that it may be accidentally changed, what about using Object.freeze on it?

The goal of the test if to raise an error if we change the xmlTag for some reason in algorithms. If we construct it from algorithms then we will never detect the change. algorithms is already Object.freeze

jonathan-gramain · 2026-05-21T19:01:13Z

+                    assert.strictEqual(
+                        err.description,
+                        'One or more of the specified parts could not be ' +
+                            'found.  The part may not have been uploaded, or ' +


Is the double space intentional? Also not very fond of matching against such a long error message that may vary, but that's okay I think.

AWS returns two spaces. For all the final API/XML errors I return exactly what AWS returns

<Error><Code>InvalidPart</Code> <Message>One or more of the specified parts could not be found. The part may not have been uploaded, or the specified entity tag may not match the part's entity tag.</Message> <UploadId>CTFNKyL2hI6n6irH0zbVWDzdPZ4n2ueJceRh1juCeuL2X5HOjrvCmXQMEqaoAatEWTEa3pWWxC7t9lOStMzjo0nJb4pv8Ct6oT Hv2n8mggVXRQ8RxiXyVyt3.3zpY98HVsZd.ozihhJ1HdUjLCkJtwJMQdNBd4fSdG9drS80vdg-</UploadId> <PartNumber>1</PartNumber> <ETag>0ebf9257a12e808d107b2ed1a826c122</ETag> <RequestId>DAQAPVMCMSY4PDPV</RequestId> <HostId>XS/2re3ieUQRTKdANLtZv14qyB2h3LjVHnmVrvjP0cj1PazPO16KkArQMtBLBy8S4mmLzQkuXZc=</HostId></Error>

okay fair enough (my little voice tells me that AWS didn't care that much about the beauty of their error messages 🙂 )

I believe no sane application would match an error by their exact error message to the dot, but I'm good with sticking to AWS to avoid ourselves asking the question. Personally I wouldn't care though 😛

Also I believe the error messages are not enforced by the API contract, hence may change at any time on AWS side, which would make our effort useless in the end. Just my two cents and my last comment on this 😉

Yeah the message can be improved, but I just copy and paste it to stay consistent. Also having the same error message may help the client if they google it, they will get more information than with a custom one

jonathan-gramain · 2026-05-22T01:53:43Z

+    // `x-amz-checksum-type` and `x-amz-checksum-algorithm` are configuration
+    // headers (MPU completeness mode / SDK algorithm hint), not value
+    // headers. They must not count toward the "value header" tally.
+    const valueHeaders = Object.keys(headers).filter(
+        h => h.startsWith('x-amz-checksum-') && h !== 'x-amz-checksum-type' && h !== 'x-amz-checksum-algorithm',
+    );


If the list of supported headers is known and a short list of supported algorithms, it may be cleaner to directly extract each of the possible ones, or otherwise filter like [list-of-supported-headers].includes(h).

It would change the behavior (probably in a good way) if the client sends one or more unsupported checksums along with multiple valid ones, where we probably want to return AlgoNotSupported rather than MultipleChecksumTypes in priority in this case, but that's more a nitpick, either way should work.

AWS checks MultipleChecksumTypes before AlgoNotSupported, the current behavior is the same as AWS.

AWS also ignores only x-amz-checksum-type and x-amz-checksum-algorithm, they don't count them to the checksum count, and they also never trigger AlgoNotSupported. if we send x-amz-checksum-BAD on the other hand we get an AlgoNotSupported. If we send x-amz-checksum-BAD + x-amz-checksum-ZZZ we get MultipleChecksumTypes.

So the order is

check no MultipleChecksumTypes

check no AlgoNotSupported

check actual checksum value, BadDigest if mismatch

I added a commit to ignore x-amz-checksum-type and x-amz-checksum-algorithm in the other functions, I didn't know this behavior existed.

Sounds good to me.

IMHO we don't necessarily have to mimic every AWS behavior when it comes to error handling in particular, as it takes time to reverse engineer those aspects with no clear benefit, and AWS implementation is not perfect and their choices can be debated too. Sure it became the de facto standard and we need to stick to its way of doing things to avoid breaking existing applications, but not necessarily in all its nitty gritty details and quirks.

I needed to test a lot to prevent being more strict than AWS and introducing breaking changes. So I have a list of errors already so we might as well use it

claude · 2026-05-22T13:07:18Z

LGTM

The checksum handling for CompleteMultipartUpload is well-implemented: the split between md5-only body validation and final-object checksum assertion correctly matches AWS behavior. The callNext guard in processParts properly prevents double-callbacks in the mixed callback/promise flow. Per-part validation, final-object computation, and header assertion are thorough. Tests cover the full (algorithm, type) matrix including edge cases (default MPU, legacy MPU, missing parts).

Review by Claude Code

claude · 2026-05-22T13:34:18Z

completeMultipartUpload.js:352 — When storedMetadata.checksumType is undefined (legacy MPU created before the checksum feature), the error message interpolates undefined into user-facing text: "The upload was created using the undefined checksum mode." Split the !mpuType guard into a separate branch with an appropriate message.

Review by Claude Code

claude · 2026-05-22T13:37:53Z

LGTM — solid implementation with thorough test coverage.

One minor nit:
- Orphaned JSDoc in validateChecksums.js:332-337: the validateChecksumsNoChunking JSDoc now sits above the new validateContentMd5 function instead of its intended target.

Review by Claude Code

claude · 2026-05-22T14:41:36Z

require('../../../lib/services') inside an it() callback at tests/unit/api/multipartUpload.js:4119. The project testing conventions require require()/import at the top of the file, never inside describe or function bodies. Move it alongside the other top-level imports.
- Add const services = require('../../../lib/services'); at the top of the file and reference it from the test.

Review by Claude Code

claude · 2026-05-22T14:48:01Z

LGTM

The checksum validation logic is well-structured: moving CompleteMPU out of checksumedMethods into md5OnlyMethods correctly distinguishes body-digest headers from final-object-checksum headers. The callNext double-callback guard in the Promise-to-callback bridge is appropriate defensive coding. Test coverage is thorough across all algorithm/type combinations, edge cases (default vs explicit MPU, legacy MPU, missing parts), and the new x-amz-checksum-type header validation.

Review by Claude Code

claude · 2026-05-22T14:59:29Z

lib/api/completeMultipartUpload.js:623: callNext is not defined — will throw ReferenceError at runtime when computeFinalChecksum returns an error on an explicit (non-default) MPU. Should be next.
- Replace callNext(error, destBucket) with next(error, destBucket)

Review by Claude Code

claude · 2026-05-22T15:05:42Z

LGTM

Review by Claude Code

BourgoisMickael · 2026-05-22T15:18:17Z

This diff is too big, it could be in another PR by itself

this was caused by the linter

BourgoisMickael · 2026-05-22T15:39:05Z

+    const checksumHeaders = Object.keys(headers).filter(
+        header =>
+            header.startsWith('x-amz-checksum-') &&
+            header !== 'x-amz-checksum-type' &&
+            header !== 'x-amz-checksum-algorithm',
+    );


This pattern reoccurs multiple times in this file, you can make a function for that

created helper

BourgoisMickael · 2026-05-22T15:50:27Z

+        });
+
+        it(
+            'should return CRC64NVME/FULL_OBJECT on CompleteMPU response ' + 'when CreateMPU sent no checksum headers',


Suggested change

'should return CRC64NVME/FULL_OBJECT on CompleteMPU response ' + 'when CreateMPU sent no checksum headers',

'should return CRC64NVME/FULL_OBJECT on CompleteMPU response when CreateMPU sent no checksum headers',

BourgoisMickael · 2026-05-22T15:55:49Z

+                let caught;
+                try {
+                    await promise;
+                } catch (err) {
+                    caught = err;
+                }
+                assert(caught, 'expected CompleteMPU to reject');
+                assert.strictEqual(
+                    caught.name,
+                    'InvalidPart',
+                    `expected InvalidPart, got ${caught.name}: ${caught.message}`,
+                );


You can use assert.rejects

await assert.rejects(promise, err => { assert.strictEqual( err.name, 'InvalidPart', `expected InvalidPart, got ${err.name}: ${err.message}`, ); });

leif-scality · 2026-05-22T15:57:34Z

I forced push from the wrong branch, reverted the changes

BourgoisMickael · 2026-05-22T15:58:08Z

+            const log = { debug: sandbox.stub() };
+            const result = await validateMethodChecksumNoChunking(request, body, log);
+            assert.deepStrictEqual(result, ArsenalErrors.BadDigest);
+            assert(log.debug.calledOnce);


debug logs should probably not be tested

I will remove the log tests

claude · 2026-05-22T16:00:41Z

LGTM — well-structured feature with thorough test coverage across all algorithm/type combinations, error paths, and edge cases. Two minor nits posted inline:

- continueProcessParts(null) at two call sites passes an argument the function ignores — should be continueProcessParts()

Review by Claude Code

BourgoisMickael · 2026-05-22T16:00:47Z

+            };
+            const log = { debug: sandbox.stub() };
+            const result = await validateMethodChecksumNoChunking(request, body, log);
+            assert.strictEqual(result, null);


In some tests above you use assert.ifError(result) and here assert.strictEqual(result, null), you should stick to only 1 pattern and be consistent everywhere

used ifError everywhere

BourgoisMickael · 2026-05-22T16:01:51Z

+                apiMethod: 'completeMultipartUpload',
+                headers: { 'content-md5': '1B2M2Y8AsgTpgAmY7PhCfg==' },
+            };
+            const log = { debug: sandbox.stub() };


It would be better to have a full mocked logger like it's done in some other test files, to avoid breakin if we change from debug to another level

I will remove the log tests

jonathan-gramain · 2026-05-23T00:49:24Z

+    const algorithm = storedMetadata.checksumAlgorithm;
+    const type = storedMetadata.checksumType;


Deconstruction could be slightly more readable

Suggested change

const algorithm = storedMetadata.checksumAlgorithm;

const type = storedMetadata.checksumType;

const { checksumAlgorithm: algorithm, checksumType: type } = storedMetadata;

jonathan-gramain · 2026-05-23T00:53:23Z

-                }
-                const { keysToDelete, extraPartLocations } = filteredPartsObj;
-                const { aggregateETag, dataLocations, calculatedSize } = partsInfo;
+                function continueProcessParts() {


Shouldn't this function be another step in the waterfall?

integrated it with the waterfall

jonathan-gramain · 2026-05-23T00:57:15Z

+                                error: resolveErr,
+                            });
+                            return next(resolveErr, destBucket);
+                        }


Is there a benefit in catching those errors since we already have a catch-all below

fixed by the previous comment

jonathan-gramain · 2026-05-23T01:00:23Z

+    // CompleteMPU is not in `checksumedMethods` (x-amz-checksum-* is the
+    // final-object checksum, not a body digest) but it still must validate
+    // Content-MD5 against the XML body when present.
+    describe('completeMultipartUpload (md5-only path)', () => {


I think a lot of the unit tests could be turned into a declarative matrix for readability.

This is an edge case, Other tests use for loops to test all checksums algorithms already

jonathan-gramain · 2026-05-23T01:09:10Z

+
+    // Resolves with { xml, headers } so callers can inspect both the
+    // response body and the response headers.
+    function completeMpuP(uploadId, partChecksumXml = '') {


It seems to me the test code is riddled with this type of local helpers, maybe we should consider a common layer of helpers for MPU construction?

moved them to mpuUtils.js

jonathan-gramain · 2026-05-23T01:12:18Z

+        it(
+            'should return CRC64NVME/FULL_OBJECT on CompleteMPU response ' + 'when CreateMPU sent no checksum headers',


Extra newline and concatenation doesn't look necessary.

…ecksum header

…ing in part metadata

…igests

claude · 2026-05-26T15:40:52Z

LGTM

The checksum handling for CompleteMultipartUpload is well-structured: the separation of body-digest validation (md5-only path) from final-object checksum validation is clean, the per-part validation logic correctly implements the AWS semantics for default vs explicit MPUs, and the fail-or-skip strategy in computeFinalChecksum appropriately differentiates between default and explicit MPUs. Test coverage is thorough across the algorithm/type matrix, edge cases, and response validation.

Review by Claude Code

leif-scality force-pushed the improvement/CLDSRV-902-calculate-final-checksum-from-parts branch 2 times, most recently from 2493909 to 538c16c Compare May 21, 2026 09:18

Base automatically changed from improvement/CLDSRV-902-calculate-final-checksum-from-parts to development/9.4 May 21, 2026 13:18

leif-scality force-pushed the improvement/CLDSRV-898-complete-mpu-checksums-2 branch from 27b4a43 to a90bd94 Compare May 21, 2026 13:24

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Comment thread lib/api/completeMultipartUpload.js Outdated

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Comment thread lib/api/apiUtils/integrity/validateChecksums.js

CLDSRV-898: prettier format multipartUpload.js

99ee6c6

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leif-scality force-pushed the improvement/CLDSRV-898-complete-mpu-checksums-2 branch from 7b3785c to fb9139f Compare May 26, 2026 10:46

leif-scality added 9 commits May 26, 2026 17:33

CLDSRV-898: prettier format mpuUtils.js

2f5fe1d

CLDSRV-898: validate per-part checksums and x-amz-checksum-type

7ebb968

CLDSRV-898: CompleteMPU calculate and validate final checksum with ch…

8a596a8

…ecksum header

CLDSRV-898: CompleteMPU store FULL_OBJECT checksum in object metadata

e28f0ce

CLDSRV-898: CompleteMPU set checksum value and type in response XML body

aba62f4

CLDSRV-898: CompleteMPU checksum functional tests

3a66200

CLDSRV-898: reject Checksum<X> field on a default MPU checksum

6004a6c

CLDSRV-898: reject CompleteMPU if explicit checksum but checksum miss…

b305c32

…ing in part metadata

CLDSRV-898: stop treating x-amz-checksum-algorithm/type as checksum d…

ee04392

…igests

leif-scality force-pushed the improvement/CLDSRV-898-complete-mpu-checksums-2 branch from fb9139f to ee04392 Compare May 26, 2026 15:37

leif-scality requested review from BourgoisMickael and jonathan-gramain May 26, 2026 15:40

	`The ${algoLabel} you specified for part ${partNumber} ` + 'did not match what we received.',
	`The ${algoLabel} you specified for part ${partNumber} did not match what we received.`,

	'should return CRC64NVME/FULL_OBJECT on CompleteMPU response ' + 'when CreateMPU sent no checksum headers',
	'should return CRC64NVME/FULL_OBJECT on CompleteMPU response when CreateMPU sent no checksum headers',

		const algorithm = storedMetadata.checksumAlgorithm;
		const type = storedMetadata.checksumType;

	const algorithm = storedMetadata.checksumAlgorithm;
	const type = storedMetadata.checksumType;
	const { checksumAlgorithm: algorithm, checksumType: type } = storedMetadata;

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bert-e commented May 21, 2026

Hello leif-scality,

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bert-e commented May 21, 2026

Incorrect fix version

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claude Bot commented May 22, 2026

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leif-scality commented May 15, 2026 •

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