download a file from a persistent-storage bucket - #1466
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📝 WalkthroughWalkthroughPersistent storage now supports authenticated file downloads through a registered P2P command and an HTTP GET endpoint. Downloads stream raw bytes, enforce bucket access control, set attachment headers, map errors, and include integration coverage and documentation. ChangesPersistent storage downloads
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟠 High · up to The PR adds authenticated raw-file downloads over HTTP and P2P, but the HTTP response lacks an explicit no-store policy, so an intermediary could serve ACL-protected bytes without rechecking authorization; deployments using the S3 backend also cannot currently complete this command. Merge readiness remains high risk until cache behavior is constrained and provider support is addressed or explicitly accepted. Sequence Diagram(s)sequenceDiagram
participant Client
participant persistentStorageRoute
participant PersistentStorageDownloadFileHandler
participant PersistentStorage
Client->>persistentStorageRoute: GET bucket file with authentication
persistentStorageRoute->>PersistentStorageDownloadFileHandler: download command
PersistentStorageDownloadFileHandler->>PersistentStorage: getReadableStream(bucketId, fileName)
PersistentStorage-->>PersistentStorageDownloadFileHandler: authorized file stream
PersistentStorageDownloadFileHandler-->>persistentStorageRoute: status, headers, and stream
persistentStorageRoute-->>Client: raw bytes with attachment headers
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Out of Scope Changes checkExplanation The changes remain within scope for issue Full details: Docstring CoverageExplanation No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 6 files. (2 skipped: 2 unsupported.) ✨ Finishing Touches📝 Generate docstrings
🧪 Generate unit tests (beta)
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alexcos20
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AI automated code review (Gemini 3).
Overall risk: low
Summary:
This PR successfully introduces the persistentStorageDownloadFile command and its corresponding HTTP route to allow file downloads from a bucket. The architecture, implementation, and integration with the existing Persistent Storage handlers are clean and well-structured. Good job on adding comprehensive integration tests for the new functionalities. I've left a couple of minor suggestions regarding the Content-Disposition header encoding and stream error handling in the HTTP route to ensure maximum stability and client compatibility. LGTM!
Comments:
• [INFO][style] Using encodeURIComponent directly inside the filename="..." directive will cause spaces and special characters to be rendered literally as URL-encoded values (like %20) in some browsers, because the standard filename parameter expects a raw string. For proper UTF-8 filename support across all clients, it's highly recommended to use the filename* parameter defined in RFC 5987 / RFC 6266 alongside a fallback.
- 'Content-Disposition': `attachment; filename="${encodeURIComponent(task.fileName)}"`
+ 'Content-Disposition': `attachment; filename="${task.fileName.replace(/"/g, '')}"; filename*=UTF-8''${encodeURIComponent(task.fileName)}`• [WARNING][bug] Piping a stream directly to res without an error handler can sometimes cause the Node.js process to crash or the request to hang indefinitely if the source stream emits an error mid-flight. Consider attaching an error handler or utilizing Node's stream.pipeline to safely manage the stream lifecycle.
- response.stream.pipe(res)
+ response.stream.on('error', (err) => {
+ HTTP_LOGGER.error(`Stream error during download: ${err}`)
+ if (!res.headersSent) res.status(500).send('Internal Server Error')
+ else res.end()
+ }).pipe(res)
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Actionable comments posted: 3
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Inline comments:
In `@src/components/core/handler/persistentStorage.ts`:
- Around line 465-470: Update the asciiFallback construction in the
Content-Disposition headers to replace non-ASCII and control characters,
ensuring the value passed to filename is safe for Node response headers;
preserve task.fileName unchanged only in the encoded filename* parameter.
In `@src/components/httpRoutes/persistentStorage.ts`:
- Line 199: Update the response streaming flow around response.stream.pipe(res)
to destroy response.stream when req.aborted fires or when res.close occurs
before the response completes, while preserving normal cleanup after successful
end-of-stream.
- Around line 187-189: Update the successful authenticated download response in
the relevant persistent-storage route to set the Cache-Control header to
no-store alongside the existing response headers, and extend the HTTP-route test
to assert this header.
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Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
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📒 Files selected for processing (8)
docs/API.mddocs/persistentStorage.mdsrc/@types/commands.tssrc/components/core/handler/coreHandlersRegistry.tssrc/components/core/handler/persistentStorage.tssrc/components/httpRoutes/persistentStorage.tssrc/test/integration/persistentStorage.test.tssrc/utils/constants.ts
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2 participants
Closes #1461
Feat: download a file from a persistent-storage bucket
Problem
Persistent Storage let a consumer create buckets, upload/list/delete files, and fetch a
getFileObjectdescriptor for c2d — but there was no way to read a file's bytes back out.The stored bytes could only be consumed indirectly (mounted into a compute job). This PR adds a
persistentStorageDownloadFilecommand that streams the raw file content back to an authorizedconsumer, over both HTTP and P2P.
Behavior (as designed)
persistentStorageDownloadFiletakesbucketId+fileName(plus the standardauth fields) and returns the raw file bytes as the response stream — not a JSON envelope
like the sibling commands.
validateTokenOrSignaturegate as the other persistent-storage commands.The backend's
getReadableStream(bucketId, fileName, consumerAddress)already enforces thebucket ACL (owner or on the bucket access list), throwing
PersistentStorageAccessDeniedErrorotherwise — no new access logic was added.
GET .../buckets/:bucketId/files/:fileName) pipes the stream straight to theresponse with
Content-Type: application/octet-stream, aContent-Disposition: attachmentheader, and a best-effort
Content-Length(fromgetFileInfo).response.streamchunks back over the length-prefixed stream, identically to the coredownloadcommand.403(ACL denied),404(file not found),400(missing params),500otherwise — matching the sibling handlers.
Design notes
PersistentStorageFactory.getReadableStreamis abstract and implemented in both
PersistentStorageLocalFSandPersistentStorageS3. Thehandler is a thin wrapper, so localfs and (future) s3 backends are both covered.
GET .../files/:fileNamepath (previously free — POST/DELETE sharedit, and the existing GETs are
.../filesand.../files/:fileName/object). The/objectvariant is untouched and still returns the JSON file object for c2d references.
Changes
Command registration
src/utils/constants.ts— addPERSISTENT_STORAGE_DOWNLOAD_FILE: 'persistentStorageDownloadFile'to bothPROTOCOL_COMMANDSand theSUPPORTED_PROTOCOL_COMMANDSallow-list.Types
src/@types/commands.ts— addPersistentStorageDownloadFileCommand(bucketId,fileName,plus
consumerAddress/signature/nonce), mirroringPersistentStorageGetFileObjectCommand.Handler
src/components/core/handler/persistentStorage.ts— newPersistentStorageDownloadFileHandler:standard rate-limit +
validateTokenOrSignaturegate, thengetReadableStream(...)and returnthe stream directly with
Content-Type/Content-Disposition(and best-effortContent-LengthfromgetFileInfo). Error mapping:403(PersistentStorageAccessDeniedError),404(message contains "not found"),500otherwise.Registry
src/components/core/handler/coreHandlersRegistry.ts— import and registerPersistentStorageDownloadFileHandlerunderPERSISTENT_STORAGE_DOWNLOAD_FILE.HTTP route
src/components/httpRoutes/persistentStorage.ts— newGET /api/services/persistentStorage/buckets/:bucketId/files/:fileNamethat builds the commandfrom
req.params/req.queryand pipes the binary stream to the response(
response.stream.pipe(res)withres.set(response.status.headers)), instead of thestreamToObjectJSON path used by the other routes.Docs
docs/persistentStorage.md— addpersistentStorageDownloadFileto the P2P command list, theGET .../files/:fileNameHTTP endpoint (with a note that it returns raw bytes and that/objectstays for the c2d file object), and a "Download file" entry under Features.
docs/API.md— newGET .../buckets/:bucketId/files/:fileNameendpoint section (raw-bytesresponse, response headers, and the 403/404 error cases), placed after the
/objectGET.Tests
src/test/integration/persistentStorage.test.ts— new round-trip test: create bucket → upload→ download and assert the returned bytes and
Content-Lengthmatch the upload; then anon-allowed consumer (
forbiddenConsumer, neither owner nor on any ACL) gets a403with anullstream.Why it's safe
HTTP verb+path; no existing shape changes. No schema migration.
getReadableStream(owner-or-ACL), the same check that already guardsgetFileObject/listFiles/uploadFile/deleteFile. No new authorization path was introduced.downloadpattern, so HTTP and P2P behave identically.Summary by CodeRabbit
New Features
Documentation