[spydon]

Closes SDK-2277.

Brings two Storage features in line with supabase-swift (supabase/supabase-swift#1529 and supabase/supabase-swift#1531), following the draft transfer_progress and download_as_stream specs in supabase/sdk.

Upload progress

Every upload method (upload, uploadBinary, uploadStream, update, updateBinary, updateStream, uploadToSignedUrl, uploadBinaryToSignedUrl, uploadStreamToSignedUrl) takes an onProgress callback of the new type UploadProgressCallback, called with the bytes sent so far and the total.

• The total is the byte length of the data, the size of the file, or the given contentLength. It is null for a stream without a length.
• Chunks over 64 KiB are sliced, so a single Uint8List reports more than once. The slicing that IdleTimeout already did moved to a shared sliceRequestBody in supabase_common, which both use.
• An empty body reports (0, 0) once.
• A retried upload reports 0 with the same total before it sends the body again, but only when an earlier attempt had reported anything.
• Only the latest attempt reports, so a timed-out attempt whose body is still draining cannot interleave with the retry. Nothing reports once the upload has returned or failed.
• An exception thrown by the callback fails the upload with that exception and is not retried. It is not wrapped in a StorageTransportException.

On the web the browser takes the whole body at once, so progress reaches the total right away. The dartdoc says so.

Byte-range downloads

download and downloadStream take a range of the new type ByteRange(start, [end]), sent as Range: bytes=start-end. Both offsets are zero-based and inclusive. Without an end the range runs to the end of the file.

• A negative start or an end before start throws a RangeError before any request is sent.
• A range combined with an image transformation throws an ArgumentError before any request is sent.
• A ranged request answered with any 2xx other than 206 throws a StorageException. Neither method exposes the status, so returning the whole file would let a caller that resumes a download append it to what it already has. This is stricter than the draft spec, which returns such a response as it is together with its status.

Breaking change

uploadToSignedUrl and uploadBinaryToSignedUrl took their options as optional positional parameters. They are named now, like on every other upload method, so passing onProgress does not mean passing null for retryOptions and abortSignal. MIGRATION.md has a section for it.

Not in this PR

• Download progress, which the transfer-progress spec also covers.
• Exposing the response status and Content-Range on downloads.

Compliance

There is no capability ID for transfer progress or byte ranges in the pinned matrix yet, so UploadProgressCallback is registered as a supporting symbol of storage.file_buckets.upload and ByteRange of storage.file_buckets.download. The symbol, drift and schema checks pass locally against the pinned SHA.

Summary by CodeRabbit

• New Features
  • Added byte-range downloads for files and streams. Requests fail with an error if the server returns the full file instead of the requested range; byte ranges cannot be combined with image transformations.
  • Added upload progress reporting for file, binary, and stream uploads, including signed-URL uploads and updates. Progress resets when an upload is retried.
• Documentation
  • Clarified download cancellation behavior and signed-URL upload options. Signed-URL upload options now use named parameters.

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📥 Commits

Reviewing files that changed from the base of the PR and between e399206 and 37b8757.

📒 Files selected for processing: 4

• packages/supabase_storage/lib/src/fetch.dart
• packages/supabase_storage/lib/src/storage_file_api.dart
• packages/supabase_storage/lib/src/types.dart
• sdk-compliance.yaml

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📝 Walkthrough

The change adds upload progress callbacks and byte-range downloads to Supabase Storage. It also extracts request-body chunk slicing into a shared helper and uses it in idle-timeout handling. The migration guide and SDK compliance configuration are updated to reflect the API changes.

Changes: Upload progress reporting

Layer / File(s)	Summary
Expose upload progress callbacks packages/supabase_storage/lib/src/types.dart, packages/supabase_storage/lib/src/storage_file_api.dart, MIGRATION.md, sdk-compliance.yaml	Adds UploadProgressCallback to upload and update methods, including signed-URL uploads. Signed-URL file and binary upload options now use named arguments. The migration guide and SDK compliance entries document the API updates.
Report progress during upload packages/supabase_storage/lib/src/fetch.dart, packages/supabase_storage/test/fetch_test.dart	Fetch reports sent bytes and optional totals for upload bodies. Retries restart progress reporting at zero. Callback errors propagate without retry.

Ranged downloads

Layer / File(s)	Summary
Apply byte ranges to downloads packages/supabase_storage/lib/src/types.dart, packages/supabase_storage/lib/src/storage_file_api.dart, packages/supabase_storage/lib/src/fetch.dart, MIGRATION.md	Adds ByteRange and optional range parameters to download methods. Ranged requests send a Range header and require a partial-content response. The migration guide also documents download abort behavior.
Validate ranged download behavior packages/supabase_storage/test/basic_test.dart, sdk-compliance.yaml	Tests bounded and open-ended ranges, rejected whole-file responses, transformed-image range rejection, and range validation. Updates SDK compliance symbols.

Shared request-body slicing

Layer / File(s)	Summary
Extract and use request-body slicing packages/supabase_common/lib/src/request_body.dart, packages/supabase_common/lib/src/idle_timeout.dart, packages/supabase_common/lib/supabase_common.dart, packages/supabase_common/test/request_body_test.dart	Adds and exports a helper that splits chunks larger than 64 KiB. IdleTimeout.watchRequestBody uses the helper, and tests cover slicing and pass-through behavior.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant Caller
  participant StorageFileApi
  participant Fetch
  participant HTTPClient
  Caller->>StorageFileApi: Call an upload method with onProgress
  StorageFileApi->>Fetch: Forward the callback
  Fetch->>HTTPClient: Send the upload body
  Fetch-->>Caller: Report sent bytes and optional total

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sequenceDiagram
  participant Caller
  participant StorageFileApi
  participant Fetch
  participant HTTPServer
  Caller->>StorageFileApi: Request download with ByteRange
  StorageFileApi->>Fetch: Send Range header and enable partial-content validation
  Fetch->>HTTPServer: Send ranged request
  HTTPServer-->>Fetch: Return response
  Fetch-->>StorageFileApi: Return body when status is 206
  StorageFileApi-->>Caller: Return download result

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Merge Risk: ⚪ Minimal · up to 37b87

This change adds upload progress callbacks and byte-range downloads to Storage. No actionable merge-blocking risk was identified in the supplied context. The signed-URL upload options are now named parameters, which is a documented breaking change.

Pre-merge checks: 5

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely identifies the two main changes: upload progress reporting and download byte ranges. The breaking-change marker is also relevant because signed URL upload parameters ch…
Docstring Coverage		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 0…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

Full details: Title check

Explanation

The title clearly and concisely identifies the two main changes: upload progress reporting and download byte ranges. The breaking-change marker is also relevant because signed URL upload parameters changed.

Full details: Docstring Coverage

Explanation

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 0 files. (4 skipped: 4 unsupported.)

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Actionable comments posted: 1

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• 🪄 Fix comments: Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at @packages/supabase_common/lib/src/request_body.dart:
- Line 14: Update the `Stream.fromIterable` construction to use a lazy iterable
that creates each `sublist` only as the output stream consumes it, rather than
eagerly building a list of all slices. Preserve the existing slice sizes and
ordering.

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ℹ️ Review info

⚙️ Run configuration

• Configuration used: Repository: supabase/supabase-flutter/.coderabbit.yaml
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📥 Commits

Reviewing files that changed from the base of the PR and between 55c0565 and 5309325.

📒 Files selected for processing: 11

• MIGRATION.md
• packages/supabase_common/lib/src/idle_timeout.dart
• packages/supabase_common/lib/src/request_body.dart
• packages/supabase_common/lib/supabase_common.dart
• packages/supabase_common/test/request_body_test.dart
• packages/supabase_storage/lib/src/fetch.dart
• packages/supabase_storage/lib/src/storage_file_api.dart
• packages/supabase_storage/lib/src/types.dart
• packages/supabase_storage/test/basic_test.dart
• packages/supabase_storage/test/fetch_test.dart
• sdk-compliance.yaml