Swift registry metadata: preserve submitted JSON fields (repositoryURLs/licenseURL) and accept empty metadata payloads

[Copilot]

Description

Swift package upload/metadata handling diverged from the registry schema in multiple ways: user-provided metadata fields were not fully reflected back, and empty JSON metadata needed to be accepted cleanly. This change aligns upload+read behavior with those expectations and adds regression coverage.

• Metadata round-trip behavior

  • GET .../swift/{scope}/{name}/{version} now returns metadata.repositoryURLs from stored Swift version properties (all submitted URLs, not just one).
  • GET .../swift/{scope}/{name}/{version} now returns metadata.licenseURL when provided in upload metadata JSON.
  • metadata.author is now omitted when no author data exists, instead of returning an empty Person object.

• Empty JSON metadata handling

  • Parsing safely handles metadata={} (and null) without producing invalid/empty-author artifacts.
  • Uploads with empty metadata continue to succeed while still extracting manifests from the source archive.

• Regression coverage

  • Integration tests now verify:
    • user-provided metadata JSON is preserved in API output (repositoryURLs, licenseURL),
    • empty metadata JSON uploads succeed and return empty/omitted optional metadata fields.
  • Unit tests add explicit coverage for metadata parsing of licenseURL and empty JSON metadata.

type SoftwareSourceCode struct {
    // ...
    Author         *Person  `json:"author,omitempty"`
    RepositoryURLs []string `json:"repositoryURLs,omitempty"`
    LicenseURL     string   `json:"licenseURL,omitempty"`
}

Testing

• ✅ make fmt
• ✅ go test ./modules/packages/swift
• ✅ make 'test-sqlite#TestPackageSwift'
• ✅ Parallel validation (Code Review + CodeQL)

[wxiaoguang]

Double checked, licenseURL is still missing.

@copilot Also need to add licenseURL support, the sample data is like this (besides repositoryURLs and author fields)

{
  "description": "One thing links to another.",
  "repositoryURLs": ["https://github.com/mona/LinkedList"],
  "licenseURL": "https://www.apache.org/licenses/LICENSE-2.0",
  "author": {
      "name": "Mona Lisa Octocat"
  }
}

[Copilot]

Double checked, licenseURL is still missing.

...

Implemented in ffe068b: Swift upload/response metadata now supports licenseURL end-to-end (parse, persist, and return in package version metadata), and tests were updated to cover it in both unit and integration paths. Authorship: Copilot GPT-5.4.