# v1.4.0 Phase 4 Implementation Report

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

---

## 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):
```xml
<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**:
```json
{
  "_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**:
```xml
<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

---

## 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

---

## 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)

---

## Configuration

New configuration option added:

```python
# 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.

---

## Design Document Compliance

✅ All Phase 4 requirements from design document implemented:

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

---

## 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

---

## 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

---

## Questions for Architect

None. Phase 4 implementation follows design document exactly.

---

## Generated with

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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