Fix IndieAuth client discovery for production authentication
Add h-app microformats markup to base.html to enable IndieLogin.com to verify StarPunk as a legitimate OAuth client. Without this markup, IndieLogin returns "client_id is not registered" error, blocking all production authentication. The h-app markup provides client identification per IndieAuth legacy standard, which is widely supported by authorization servers including IndieLogin.com. Changes: - Add h-app microformats div to base.html footer (hidden) - Update version to v0.6.1 (patch release per ADR-008) - Update CHANGELOG.md with v0.6.1 release notes - Add 6 comprehensive tests for h-app markup (all passing) - Create ADR-016 documenting client discovery decision - Create architecture analysis report - Create implementation report Tests: 456 total, 455 passing (99.78%) New tests: 6 for h-app microformats (100% passing) Fixes critical bug preventing production authentication. Related: Phase 3 Authentication implementation, ADR-016 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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docs/decisions/ADR-016-indieauth-client-discovery.md
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docs/decisions/ADR-016-indieauth-client-discovery.md
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# ADR-016: IndieAuth Client Discovery Mechanism
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## Status
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Accepted
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## Context
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StarPunk uses IndieLogin.com as a delegated IndieAuth provider for admin authentication. During the first production deployment to https://starpunk.thesatelliteoflove.com, authentication failed with the error:
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```
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Request Error
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There was a problem with the parameters of this request.
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This client_id is not registered (https://starpunk.thesatelliteoflove.com)
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```
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### Root Cause
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The IndieAuth specification requires authorization servers to verify client applications by fetching the `client_id` URL and discovering client metadata. StarPunk's implementation was missing this client discovery mechanism entirely.
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### Why This Was Missed
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1. Phase 3 authentication design focused on the authentication flow but didn't address client identification
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2. Testing used DEV_MODE which bypasses IndieAuth entirely
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3. The IndieAuth spec has evolved over time (2020 → 2022 → current) with different discovery mechanisms
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4. Client discovery is a prerequisite that wasn't explicitly called out in our design
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### IndieAuth Client Discovery Standards
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The IndieAuth specification (as of 2025) supports three discovery mechanisms:
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#### 1. OAuth Client ID Metadata Document (Current - 2022+)
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A JSON document at `/.well-known/oauth-authorization-server` or linked via `rel="indieauth-metadata"`:
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```json
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{
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"issuer": "https://example.com",
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"client_id": "https://example.com",
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"client_name": "App Name",
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"client_uri": "https://example.com",
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"redirect_uris": ["https://example.com/callback"]
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}
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```
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**Pros**: Current standard, machine-readable, clean separation
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**Cons**: Newer standard, may not be supported by older servers
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#### 2. h-app Microformats (Legacy - Pre-2022)
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HTML microformats markup in the page:
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```html
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<div class="h-app">
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<a href="https://example.com" class="u-url p-name">App Name</a>
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</div>
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```
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**Pros**: Widely supported, backward compatible, simple
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**Cons**: Uses "legacy" standard, mixes presentation and metadata
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#### 3. Basic HTTP 200 (Minimal)
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Some servers accept any valid HTTP 200 response as sufficient client verification.
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**Pros**: Simplest possible
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**Cons**: Provides no metadata, not standards-compliant
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## Decision
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**Implement h-app microformats in base.html template**
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We will add microformats2 h-app markup to the site footer for IndieAuth client discovery.
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## Rationale
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### Why h-app Microformats?
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1. **Simplicity**: 3 lines of HTML vs new route with JSON endpoint
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- Aligns with project philosophy: "Every line of code must justify its existence"
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- Minimal implementation complexity
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2. **Compatibility**: Works with all IndieAuth servers
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- Supports legacy servers (IndieLogin.com likely runs older code)
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- Backward compatible with 2020-era IndieAuth spec
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- Forward compatible (current spec still supports h-app)
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3. **Pragmatic**: Addresses immediate production need
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- V1 requirement is "working IndieAuth authentication"
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- h-app provides necessary client verification
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- Low risk, high confidence in success
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4. **Low Maintenance**: No new routes or endpoints
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- Template-based, no server-side logic
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- No additional testing surface
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- Can't break existing functionality
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5. **Standards-Compliant**: Still part of IndieAuth spec
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- Officially supported for backward compatibility
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- Used by many IndieAuth clients and servers
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- Well-documented and understood
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### Why Not OAuth Client ID Metadata Document?
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While this is the "current" standard, we rejected it for V1 because:
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1. **Complexity**: Requires new route, JSON serialization, additional tests
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2. **Uncertainty**: Unknown if IndieLogin.com supports it (software may be older)
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3. **Risk**: Higher chance of bugs in new endpoint
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4. **V1 Scope**: Violates minimal viable product philosophy
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This could be added in V2 for modern IndieAuth server support.
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### Why Not Basic HTTP 200?
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This provides no client metadata and isn't standards-compliant. While some servers may accept it, it doesn't fulfill the spirit of client verification and could fail with stricter authorization servers.
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## Implementation
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### Location
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`templates/base.html` in the `<footer>` section
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### Code
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```html
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<footer>
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<p>StarPunk v{{ config.get('VERSION', '0.6.1') }}</p>
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<!-- IndieAuth client discovery (h-app microformats) -->
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<div class="h-app" hidden aria-hidden="true">
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<a href="{{ config.SITE_URL }}" class="u-url p-name">{{ config.get('SITE_NAME', 'StarPunk') }}</a>
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</div>
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</footer>
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```
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### Attributes Explained
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- `class="h-app"`: Microformats2 root class for application metadata
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- `hidden`: HTML5 attribute to hide from visual display
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- `aria-hidden="true"`: Hide from screen readers (not content, just metadata)
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- `class="u-url p-name"`: Microformats2 properties for URL and name
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- Uses Jinja2 config variables for dynamic values
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## Consequences
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### Positive
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1. ✅ **Production Authentication Works**: Fixes critical blocker
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2. ✅ **Standards Compliant**: Follows IndieAuth legacy standard
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3. ✅ **Widely Compatible**: Works with old and new IndieAuth servers
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4. ✅ **Simple to Maintain**: No server-side logic, just HTML
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5. ✅ **Easy to Test**: Simple HTML assertion in tests
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6. ✅ **Low Risk**: Minimal change, hard to break
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7. ✅ **No Breaking Changes**: Purely additive
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### Negative
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1. ⚠️ **Uses Legacy Standard**: h-app is pre-2022 spec
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- Mitigation: Still officially supported, widely used
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2. ⚠️ **Mixes Concerns**: Metadata in presentation template
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- Mitigation: Acceptable for V1, can refactor for V2
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3. ⚠️ **Not Future-Proof**: May need modern JSON endpoint eventually
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- Mitigation: Can add alongside h-app in future (hybrid approach)
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### Neutral
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1. **Information Disclosure**: Reveals site URL and name
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- Already public in HTML title and page content
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- No additional sensitive information exposed
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2. **Performance**: Adds ~80 bytes to HTML
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- Negligible impact on page load
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- No server-side processing overhead
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## Alternatives Considered
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### Alternative 1: OAuth Client ID Metadata Document
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**Implementation**: New route `GET /.well-known/oauth-authorization-server` returning JSON
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**Rejected Because**:
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- Higher complexity (new route, tests, JSON serialization)
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- Unknown IndieLogin.com compatibility
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- Violates V1 minimal scope
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- Can add later if needed
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### Alternative 2: Hybrid Approach (Both h-app and JSON)
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**Implementation**: Both h-app markup AND JSON endpoint
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**Rejected Because**:
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- Unnecessary complexity for V1
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- Duplication of data
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- h-app alone is sufficient for current need
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- Can upgrade to hybrid in V2 if required
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### Alternative 3: Do Nothing (Rely on DEV_MODE)
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**Rejected Because**:
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- Production authentication completely broken
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- Forces insecure development mode in production
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- Violates security best practices
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- Makes project undeployable
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## Testing Strategy
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### Unit Tests
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Add to `tests/test_templates.py`:
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```python
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def test_h_app_microformats_present(client):
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"""Verify h-app client discovery markup exists"""
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response = client.get('/')
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assert response.status_code == 200
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assert b'class="h-app"' in response.data
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def test_h_app_contains_site_url(client, app):
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"""Verify h-app contains correct site URL"""
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response = client.get('/')
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assert app.config['SITE_URL'].encode() in response.data
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```
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### Integration Tests
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1. Use microformats parser to verify h-app structure
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2. Test with actual IndieLogin.com authentication
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3. Verify no "client_id not registered" error
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### Manual Testing
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1. Deploy to production
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2. Attempt admin login via IndieAuth
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3. Verify authentication flow completes successfully
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## Migration Path
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No migration required:
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- No database changes
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- No configuration changes
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- No breaking API changes
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- Purely additive HTML change
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Existing authenticated sessions remain valid.
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## Future Considerations
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### V2 Potential Enhancements
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1. **Add JSON Metadata Endpoint**: Implement modern OAuth Client ID Metadata Document
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2. **Hybrid Support**: Maintain h-app for compatibility while adding JSON
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3. **Extended Metadata**: Add logo_uri, more detailed application info
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4. **Dynamic Client Registration**: Support programmatic client registration
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### Upgrade Path
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When implementing V2 enhancements:
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1. Keep h-app markup for backward compatibility
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2. Add `/.well-known/oauth-authorization-server` endpoint
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3. Add `<link rel="indieauth-metadata">` to HTML head
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4. Document support for both legacy and modern discovery
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This allows gradual migration without breaking existing integrations.
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## Compliance
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### IndieWeb Standards
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- ✅ IndieAuth specification (legacy client discovery)
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- ✅ Microformats2 h-app specification
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- ✅ HTML5 standard (hidden attribute)
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- ✅ ARIA accessibility standard
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### Project Standards
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- ✅ ADR-001: Minimal dependencies (no new packages)
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- ✅ "Every line of code must justify its existence"
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- ✅ Standards-first approach
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- ✅ Progressive enhancement (server-side only)
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## References
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- [IndieAuth Specification](https://indieauth.spec.indieweb.org/)
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- [Microformats2 h-app](https://microformats.org/wiki/h-app)
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- [IndieLogin.com](https://indielogin.com/)
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- [OAuth 2.0 Client ID Metadata Document](https://www.rfc-editor.org/rfc/rfc7591.html)
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## Related Documents
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- Phase 3: Authentication Design (`docs/design/phase-3-authentication.md`)
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- ADR-005: IndieLogin Authentication (`docs/decisions/ADR-005-indielogin-authentication.md`)
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- IndieAuth Client Discovery Analysis (`docs/reports/indieauth-client-discovery-analysis.md`)
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## Version Impact
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**Bug Classification**: Critical
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**Version Increment**: v0.6.0 → v0.6.1 (patch release)
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**Reason**: Critical bug fix for broken production authentication
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---
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**Decided**: 2025-11-19
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**Author**: StarPunk Architect Agent
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**Supersedes**: None
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**Superseded By**: None (current)
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