docs: Add custom slug bug fix to CHANGELOG and implementation report

Update CHANGELOG.md with fix details in Unreleased section.
Create comprehensive implementation report documenting:
- Root cause analysis
- Code changes made
- Test results (all 13 Micropub tests pass)
- Deployment notes

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Co-Authored-By: Claude <noreply@anthropic.com>
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## [Unreleased]
### Fixed
- **Custom Slug Extraction** - Fixed bug where mp-slug was ignored in Micropub requests
- Root cause: mp-slug was extracted after normalize_properties() filtered it out
- Solution: Extract mp-slug from raw request data before normalization
- Affects both form-encoded and JSON Micropub requests
- See docs/reports/custom-slug-bug-diagnosis.md for detailed analysis
## [1.1.0] - 2025-11-25
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# Custom Slug Bug Fix - Implementation Report
**Date**: 2025-11-25
**Developer**: StarPunk Developer Subagent
**Branch**: bugfix/custom-slug-extraction
**Status**: Complete - Ready for Testing
## Executive Summary
Successfully fixed the custom slug extraction bug in the Micropub handler. Custom slugs specified via `mp-slug` parameter are now correctly extracted and used when creating notes.
## Problem Statement
Custom slugs specified via the `mp-slug` property in Micropub requests were being completely ignored. The system was falling back to auto-generated slugs even when a custom slug was provided by the client (e.g., Quill).
**Root Cause**: `mp-slug` was being extracted from normalized properties after it had already been filtered out by `normalize_properties()` which removes all `mp-*` parameters.
## Implementation Details
### Files Modified
1. **starpunk/micropub.py** (lines 290-307)
- Moved `mp-slug` extraction to BEFORE property normalization
- Added support for both form-encoded and JSON request formats
- Added clear comments explaining the timing requirement
2. **tests/test_micropub.py** (added lines 191-246)
- Added `test_micropub_create_with_custom_slug_form()` - tests form-encoded requests
- Added `test_micropub_create_with_custom_slug_json()` - tests JSON requests
- Both tests verify the custom slug is actually used in the created note
### Code Changes
#### Before (Broken)
```python
# Normalize and extract properties
try:
properties = normalize_properties(data) # mp-slug gets filtered here!
content = extract_content(properties)
title = extract_title(properties)
tags = extract_tags(properties)
published_date = extract_published_date(properties)
# Extract custom slug if provided (Micropub extension)
custom_slug = None
if 'mp-slug' in properties: # BUG: mp-slug not in properties!
slug_values = properties.get('mp-slug', [])
if slug_values and len(slug_values) > 0:
custom_slug = slug_values[0]
```
#### After (Fixed)
```python
# Extract mp-slug BEFORE normalizing properties (it's not a property!)
# mp-slug is a Micropub server extension parameter that gets filtered during normalization
custom_slug = None
if isinstance(data, dict) and 'mp-slug' in data:
# Handle both form-encoded (list) and JSON (could be string or list)
slug_value = data.get('mp-slug')
if isinstance(slug_value, list) and slug_value:
custom_slug = slug_value[0]
elif isinstance(slug_value, str):
custom_slug = slug_value
# Normalize and extract properties
try:
properties = normalize_properties(data)
content = extract_content(properties)
title = extract_title(properties)
tags = extract_tags(properties)
published_date = extract_published_date(properties)
```
### Why This Fix Works
1. **Extracts before filtering**: Gets `mp-slug` from raw request data before `normalize_properties()` filters it out
2. **Handles both formats**:
- Form-encoded: `mp-slug` is a list `["slug-value"]`
- JSON: `mp-slug` can be string `"slug-value"` or list `["slug-value"]`
3. **Preserves existing flow**: The `custom_slug` variable was already being passed to `create_note()` correctly
4. **Architecturally correct**: Treats `mp-slug` as a server parameter (not a property), which aligns with Micropub spec
## Test Results
### Micropub Test Suite
All 13 Micropub tests passed:
```
tests/test_micropub.py::test_micropub_no_token PASSED
tests/test_micropub.py::test_micropub_invalid_token PASSED
tests/test_micropub.py::test_micropub_insufficient_scope PASSED
tests/test_micropub.py::test_micropub_create_note_form PASSED
tests/test_micropub.py::test_micropub_create_note_json PASSED
tests/test_micropub.py::test_micropub_create_with_name PASSED
tests/test_micropub.py::test_micropub_create_with_categories PASSED
tests/test_micropub.py::test_micropub_create_with_custom_slug_form PASSED # NEW
tests/test_micropub.py::test_micropub_create_with_custom_slug_json PASSED # NEW
tests/test_micropub.py::test_micropub_query_config PASSED
tests/test_micropub.py::test_micropub_query_source PASSED
tests/test_micropub.py::test_micropub_missing_content PASSED
tests/test_micropub.py::test_micropub_unsupported_action PASSED
```
### New Test Coverage
**Test 1: Form-encoded with custom slug**
- Request: `POST /micropub` with `content=...&mp-slug=my-custom-slug`
- Verifies: Location header ends with `/notes/my-custom-slug`
- Verifies: Note exists in database with correct slug
**Test 2: JSON with custom slug**
- Request: `POST /micropub` with JSON body including `"mp-slug": "json-custom-slug"`
- Verifies: Location header ends with `/notes/json-custom-slug`
- Verifies: Note exists in database with correct slug
### Regression Testing
All existing Micropub tests continue to pass, confirming:
- Authentication still works correctly
- Scope checking still works correctly
- Auto-generated slugs still work when no `mp-slug` provided
- Content extraction still works correctly
- Title and category handling still works correctly
## Validation Against Requirements
Per the architect's bug report (`docs/reports/custom-slug-bug-diagnosis.md`):
- [x] Extract `mp-slug` from raw request data
- [x] Extract BEFORE calling `normalize_properties()`
- [x] Handle both form-encoded (list) and JSON (string or list) formats
- [x] Pass `custom_slug` to `create_note()`
- [x] Add tests for both request formats
- [x] Ensure existing tests still pass
## Architecture Compliance
The fix maintains architectural correctness:
1. **Separation of Concerns**: `mp-slug` is correctly treated as a server extension parameter, not a Micropub property
2. **Existing Validation Pipeline**: The slug still goes through all validation in `create_note()`:
- Reserved slug checking
- Uniqueness checking with suffix generation if needed
- Sanitization
3. **No Breaking Changes**: All existing functionality preserved
4. **Micropub Spec Compliance**: Aligns with how `mp-*` extensions should be handled
## Deployment Notes
### What to Test in Production
1. **Create note with custom slug via Quill**:
- Use Quill client to create a note
- Specify a custom slug in the slug field
- Verify the created note uses your specified slug
2. **Create note without custom slug**:
- Create a note without specifying a slug
- Verify auto-generation still works
3. **Reserved slug handling**:
- Try to create a note with slug "api" or "admin"
- Should be rejected with validation error
4. **Duplicate slug handling**:
- Create a note with slug "test-slug"
- Try to create another with the same slug
- Should get "test-slug-xxxx" with random suffix
### Known Issues
None. The fix is clean and complete.
### Version Impact
This fix will be included in **v1.1.0-rc.2** (or next release).
## Git Information
**Branch**: `bugfix/custom-slug-extraction`
**Commit**: 894e5e3
**Commit Message**: "fix: Extract mp-slug before property normalization"
**Files Changed**:
- `starpunk/micropub.py` (69 insertions, 8 deletions)
- `tests/test_micropub.py` (added 2 comprehensive tests)
## Next Steps
1. Merge `bugfix/custom-slug-extraction` into `main`
2. Deploy to production
3. Test with Quill client in production environment
4. Update CHANGELOG.md with fix details
5. Close any related issue tickets
## References
- **Bug Diagnosis**: `/home/phil/Projects/starpunk/docs/reports/custom-slug-bug-diagnosis.md`
- **Micropub Spec**: https://www.w3.org/TR/micropub/
- **Related ADR**: ADR-029 (Micropub Property Mapping)
## Conclusion
The custom slug feature is now fully functional. The bug was a simple timing issue in the extraction logic - trying to get `mp-slug` after it had been filtered out. The fix is clean, well-tested, and maintains all existing functionality while enabling the custom slug feature as originally designed.
The implementation follows the architect's design exactly and adds comprehensive test coverage for future regression prevention.