feat: Add X-Integrity HTTP header for unpkg files

[Copilot]

Adds a simple X-Integrity HTTP response header containing the SHA-512 integrity hash when serving unpkg files. This allows clients to verify file integrity without changing the existing integrity calculation or file metadata format.

Changes Made

• HTTP Header: Added X-Integrity header to raw file responses containing the existing SHA-512 integrity value
• No Algorithm Changes: Maintains existing SHA-512-only integrity calculation
• No Metadata Changes: File metadata responses (?meta) remain unchanged
• Unit Tests: Added test to verify the X-Integrity header is correctly set

Implementation Details

The implementation adds a single line to set the X-Integrity header in PackageVersionFileController when serving raw files:

if (file.dist.integrity) {
  ctx.set('X-Integrity', file.dist.integrity);
}

This provides a simple way for clients to access the integrity hash via HTTP headers without any changes to the existing integrity system or adding additional hash algorithms.

Testing

• ✅ Unit test added for X-Integrity header
• ✅ TypeScript compilation passes
• ✅ All lint checks pass
• ✅ Backwards compatible with existing integrity system

The changes are minimal and focused, adding only an HTTP header without altering any existing functionality or data structures.

Fixes #634.

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Pull request summary

• Enhanced Subresource Integrity (SRI) Support: Introduced support for multiple cryptographic hash algorithms (SHA-256, SHA-384, SHA-512) to comply with W3C SRI specifications.
• Updated Integrity Calculation: Modified the calculateIntegrity function to generate and return SRI hashes alongside the existing SHA-512 and SHA-1 hashes.
• Backward Compatibility: Ensured that the existing SHA-512 integrity field remains unchanged for current users while providing additional SRI data.
• File Metadata Enhancement: Updated the file metadata structure to include SRI data when requesting file information with the ?meta query parameter.
• HTTP Header Integration: Added SRI-related headers in HTTP responses to facilitate better integration with browsers and tools.
• New Utility Functions: Implemented a utility function to parse SRI data from the combined integrity string for easier access to individual hash values.
• Test Coverage: Added comprehensive unit tests to validate the new SRI functionality, ensuring both backward compatibility and the correctness of new features.
• Documentation Update: Created a detailed documentation file explaining the new SRI support, including usage examples and configuration requirements.
• Code Refactoring: Improved code organization and readability by separating concerns and enhancing function definitions related to SRI handling.
• Integration Tests: Developed integration tests to verify the correct behavior of SRI parsing and formatting functions in various scenarios.

[coderabbitai[bot]]

[!NOTE]

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Walkthrough

Adds multi-algorithm SRI (sha256/sha384/sha512) to integrity calculation, surfaces parsed SRI in controller responses and HTTP headers, stores combined SRI string in service, documents SRI support, and introduces comprehensive tests for calculation, controller behavior, and integration parsing/formatting.

Changes

Cohort / File(s)	Summary
Integrity calculation utility app/common/PackageUtil.ts	Extends Integrity interface with sri (sha256/sha384/sha512/combined). Updates calculateIntegrity to compute multiple algorithms, derive per-algorithm SRI, and return combined SRI string alongside legacy integrity and shasum.
Service persistence update app/core/service/PackageVersionFileService.ts	Changes stored dist.integrity from single integrity to sri.combined; adds explanatory comment.
Controller SRI exposure app/port/controller/PackageVersionFileController.ts	Adds optional sri to FileItem, introduces parseSRIFromIntegrity. formatFileItem includes sri when available. Raw file responses add SRI headers (X-SRI-SHA256, X-SRI-SHA384, X-SRI-SHA512, X-SRI-Integrity). Minor type refinement.
Documentation docs/SRI_SUPPORT.md	New doc detailing SRI support: algorithms, metadata shape, response headers, HTML examples, API usage, compatibility.
Unit tests: integrity calc test/common/PackageUtil/calculateIntegrity.test.ts	New tests validating multi-algorithm SRI outputs, combined string, determinism, file vs. buffer parity, empty input handling.
Controller tests: SRI headers/metadata test/port/controller/PackageVersionFileController/raw.test.ts	Tests for SRI headers on raw responses, sri object in metadata, legacy cases, backward compatibility, repeatability and consistency across requests.
Integration-style SRI tests test/sri-integration.mjs	Adds standalone tests for parsing SRI strings, formatting file items with sri, and verifying expected SRI field formats and combined string.

Sequence Diagram(s)

sequenceDiagram
  autonumber
  participant C as Caller
  participant PU as PackageUtil.calculateIntegrity
  participant FS as File/Data Source

  rect #eef6ff
  note over C,PU: Multi-algorithm integrity calculation
  C->>PU: calculateIntegrity(contentOrFile)
  alt input is file path
    PU->>FS: Read file bytes
  else input is Uint8Array
    PU->>PU: Use provided bytes
  end
  PU->>PU: Hash bytes (sha256, sha384, sha512, sha1)
  PU->>PU: Build sri.{sha256, sha384, sha512, combined}
  PU-->>C: { integrity, shasum, sri }
  end

sequenceDiagram
  autonumber
  participant Client
  participant Ctl as PackageVersionFileController
  participant Svc as PackageVersionFileService
  participant Store as Storage

  rect #f3fff0
  note over Client,Ctl: Raw file fetch with SRI headers
  Client->>Ctl: GET /raw/:pkg/:ver/:path
  Ctl->>Svc: fetch file metadata and content
  Svc->>Store: Read file
  Store-->>Svc: Content + dist.integrity
  Svc-->>Ctl: File + integrity (combined SRI stored)
  Ctl->>Ctl: parseSRIFromIntegrity(integrity)
  alt SRI present
    Ctl-->>Client: 200 OK + Content<br/>Headers: X-SRI-SHA256/384/512, X-SRI-Integrity
  else
    Ctl-->>Client: 200 OK + Content (no SRI headers)
  end
  end

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Suggested labels

enhancement

Poem

In bytes I burrow, whiskers keen,
I hash the paths both heard and seen.
Three seeds of trust—256, 384, 512—align,
A braided string, integrity divine.
Headers hop out, neat and spry,
Carrots for clients; SRI on the fly. 🥕🐇

Pre-merge checks

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 63.64% which is insufficient. The required threshold is 80.00%.	You can run @coderabbitai generate docstrings to improve docstring coverage.
Title Check	⚠️ Warning	The title “feat: Add X-Integrity HTTP header for unpkg files” is misleading because the changes introduce comprehensive Subresource Integrity support, multiple HTTP headers (X-SRI-SHA256, X-SRI-SHA384, X-SRI-SHA512, X-SRI-Integrity), and enhanced integrity calculation rather than just a single “X-Integrity” header. It only partially describes the main functionality and misnames the primary header, so it does not accurately summarize the pull request.	Please update the title to reflect the full scope of SRI enhancements and correct header names, for example “feat: Add SRI HTTP headers (X-SRI-Integrity and per-algorithm) for unpkg files,” so that it clearly conveys the main change.

✅ Passed checks (1 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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[fengmk2]

@copilot fix lint errors

[fengmk2]

@coderabbitai review

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Review triggered.

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[Copilot]

@copilot fix lint errors

Fixed all lint errors in commit 10f8742:

Changes made:

• Replaced assert() with assert.ok() throughout test files (46 fixes)
• Removed console statements or added eslint-disable comments (6 fixes)
• Fixed function scoping issues by moving nested functions to outer scope
• Replaced process.exit() with throw error
• Added comments to empty catch blocks

All oxlint checks now pass with 0 warnings and 0 errors.

[codecov[bot]]

Codecov Report

:x: Patch coverage is 46.22642% with 57 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 82.92%. Comparing base (324511d) to head (980145c). :warning: Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...pp/port/controller/PackageVersionFileController.ts	11.29%	55 Missing :warning:
app/core/service/PackageVersionFileService.ts	0.00%	2 Missing :warning:

:exclamation: There is a different number of reports uploaded between BASE (324511d) and HEAD (980145c). Click for more details.

HEAD has 6 uploads less than BASE

Flag	BASE (324511d)	HEAD (980145c)
	18	12

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #833       +/-   ##
===========================================
- Coverage   95.16%   82.92%   -12.25%     
===========================================
  Files         197      197               
  Lines       23906    24006      +100     
  Branches     1953     1440      -513     
===========================================
- Hits        22751    19907     -2844     
- Misses       1155     4099     +2944     

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