StarPunk/docs/design/v1.4.0/2025-12-16-phase4-implementation-report.md

v1.4.0 Phase 4 Implementation Report

Date: 2025-12-16 Phase: Phase 4 - Enhanced Feed Media Status: ✅ Complete Developer: Claude Code Agent

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Implementation Summary

Phase 4 enhances all three feed formats (RSS, JSON Feed, ATOM) to expose media variants and metadata to feed readers.

Changes Made

1. RSS Feed (starpunk/feeds/rss.py)

Enhanced streaming RSS generation with full Media RSS specification support:

• Wrap size variants in <media:group> elements
• Add <media:content> for large/medium/small variants with attributes:
  • url: Variant image URL
  • type: MIME type
  • medium: "image"
  • isDefault: "true" for largest available variant
  • width: Image width in pixels
  • height: Image height in pixels
  • fileSize: File size in bytes
• Add <media:thumbnail> for thumb variant with dimensions
• Add <media:title type="plain"> for captions
• Implement isDefault fallback logic: large → medium → small
• Maintain backwards compatibility for media without variants (legacy fallback)

Example output (with variants):

<media:group>
  <media:content url="https://example.com/media/2025/12/uuid_medium.jpg"
                 type="image/jpeg"
                 medium="image"
                 isDefault="true"
                 width="640"
                 height="480"
                 fileSize="2088"/>
  <media:content url="https://example.com/media/2025/12/uuid_small.jpg"
                 type="image/jpeg"
                 medium="image"
                 isDefault="false"
                 width="320"
                 height="240"
                 fileSize="738"/>
</media:group>
<media:thumbnail url="https://example.com/media/2025/12/uuid_thumb.jpg"
                 width="150"
                 height="150"/>
<media:title type="plain">Caption text</media:title>

2. JSON Feed (starpunk/feeds/json_feed.py)

Enhanced _starpunk extension with media variant information:

• Add about URL (configurable via STARPUNK_ABOUT_URL config)
  • Default: https://github.com/yourusername/starpunk
• Add media_variants array when variants exist
• Each variant entry includes:
  • url: Variant image URL
  • width: Image width
  • height: Image height
  • size_in_bytes: File size
  • mime_type: MIME type

Example output:

{
  "_starpunk": {
    "permalink_path": "/note/test",
    "word_count": 42,
    "about": "https://github.com/yourusername/starpunk",
    "media_variants": [
      {
        "caption": "Test caption",
        "variants": {
          "thumb": {
            "url": "https://example.com/media/2025/12/uuid_thumb.jpg",
            "width": 150,
            "height": 150,
            "size_in_bytes": 3000
          },
          "small": { ... },
          "medium": { ... },
          "original": { ... }
        }
      }
    ]
  }
}

3. ATOM Feed (starpunk/feeds/atom.py)

Enhanced enclosure links with caption support:

• Add title attribute to enclosure links for captions
• Keep simple (no variants in ATOM per design decision)

Example output:

<link rel="enclosure"
      type="image/jpeg"
      href="https://example.com/media/2025/12/uuid.jpg"
      length="3138"
      title="Caption text"/>

4. Test Updates (tests/test_feeds_rss.py)

Updated streaming media test to match v1.4.0 behavior:

• Changed item.find("media:content") to item.find(".//media:content")
• Now searches descendants (inside media:group) instead of direct children
• Updated docstring to reflect v1.4.0 variant support

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Testing

Test Results

All 44 feed tests pass:

tests/test_feeds_rss.py ............. (13 tests)
tests/test_feeds_json.py ............ (13 tests)
tests/test_feeds_atom.py ............ (11 tests)
tests/test_feeds_rss.py ......... (7 integration tests)

Manual Verification

Verified Phase 4 features with live test:

1. RSS Feed: ✅

   • Has media:group wrapper
   • Has 2 media:content elements (medium, small)
   • All attributes present (url, type, medium, isDefault, width, height, fileSize)
   • Has media:thumbnail with width/height
   • Has media:title with type="plain"

2. JSON Feed: ✅

   • Has _starpunk extension
   • Has about URL
   • Has media_variants array
   • All variant types present (thumb, small, medium, original)
   • All fields present (url, width, height, size_in_bytes)

3. ATOM Feed: ✅

   • Enclosures have title attribute
   • Caption text preserved

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Backwards Compatibility

Phase 4 maintains full backwards compatibility:

1. Media without variants (pre-v1.4.0 uploads):

   • RSS generates legacy <media:content> directly under <item>
   • JSON Feed omits media_variants key
   • ATOM behaves as before

2. Feed readers:

   • Readers that don't understand Media RSS simply ignore the namespace
   • Readers that don't understand _starpunk extension ignore it
   • All feeds still include standard elements (enclosure, attachments)

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Configuration

New configuration option added:

# config.py or environment
STARPUNK_ABOUT_URL = "https://github.com/yourusername/starpunk"

Default value: https://github.com/yourusername/starpunk

This URL documents the _starpunk JSON Feed extension for consumers.

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Design Document Compliance

✅ All Phase 4 requirements from design document implemented:

• RSS: Use <media:group> for variants
• RSS: Add <media:content> with all attributes
• RSS: Add <media:thumbnail> for thumb variant
• RSS: Add <media:title> for captions
• RSS: Handle isDefault correctly (largest available)
• RSS: Backwards compatibility for legacy media
• JSON Feed: Add _starpunk.about URL
• JSON Feed: Add _starpunk.media_variants array
• ATOM: Add title attribute to enclosures
• Ensure variants loaded in feeds (via get_note_media())

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Files Modified

1. /home/phil/Projects/starpunk/starpunk/feeds/rss.py - RSS enhancements
2. /home/phil/Projects/starpunk/starpunk/feeds/json_feed.py - JSON Feed enhancements
3. /home/phil/Projects/starpunk/starpunk/feeds/atom.py - ATOM enhancements
4. /home/phil/Projects/starpunk/tests/test_feeds_rss.py - Test update for v1.4.0

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Next Steps

Phase 4 is complete. The next phase (Phase 5) is Testing & Documentation.

Per design document, Phase 5 includes:

• Unit tests for Phase 4 features (existing tests pass)
• Update CHANGELOG.md
• Update architecture docs
• Version bump to 1.4.0

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Questions for Architect

None. Phase 4 implementation follows design document exactly.

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🤖 Generated with Claude Code

Co-Authored-By: Claude noreply@anthropic.com