# TAXII 2.0 Compliance Report

## Summary

The TAXII 2.0 client implementation has been validated against the OASIS TAXII 2.0 Committee Specification 01 (July 19, 2017) and updated to improve compliance with the specification.

## Compliance Status

### ✅ Compliant Features

#### 1. **Discovery Support** (Spec Section 4.1)
- Implements discovery endpoint functionality
- Returns required fields: `title`, `api_roots`
- Returns optional fields: `description`, `contact`, `default`
- API roots are returned as list of URLs per spec

#### 2. **Collections Support** (Spec Sections 5.1, 5.2)
- Lists available collections with proper resource structure
- Returns required fields: `id`, `title`, `can_read`, `can_write`
- Returns optional fields: `description`, `media_types`
- Removed non-spec `alias` field that was incorrectly included

#### 3. **Get Objects** (Spec Section 5.3)
- Returns STIX objects as a bundle (required by spec)
- Supports filtering parameters:
  - `added_after` - temporal filtering
  - `match[id]` - filter by object ID
  - `match[type]` - filter by object type
  - `match[version]` - version filtering (last/first/all/specific)
- Properly wraps responses in STIX bundle format

#### 4. **Add Objects** (Spec Section 5.4)
- Accepts STIX bundle with objects
- Returns status resource with all required fields
- Includes optional detailed status fields when available

#### 5. **Manifest Support** (Spec Section 5.6)
- Returns manifest entries with proper structure
- Supports same filtering as get_objects
- Returns required and optional fields per spec

#### 6. **Authentication** (Spec Section 1.6)
- Supports HTTP Basic authentication (mandatory per spec)
- Authentication credentials properly passed to underlying library

#### 7. **Error Handling**
- Proper error responses for connection failures
- Permission checks for write operations
- Graceful handling of missing resources

### ⚠️ Partially Compliant Features

#### 1. **Pagination** (Spec Section 3.4)
- Basic limit support implemented
- Full Range header support depends on underlying taxii2client library
- Custom headers (X-TAXII-Date-Added-First/Last) not directly exposed

#### 2. **Content Negotiation** (Spec Section 1.5)
- Media type handling delegated to taxii2client library
- Proper media types included in responses where applicable

### 📝 Implementation Notes

1. **Library Dependencies**: The implementation wraps the official `taxii2client` library from OASIS, which handles many low-level protocol details internally.

2. **Bundle Format**: The client ensures all object responses are properly wrapped in STIX bundles as required by the specification.

3. **Filtering**: All spec-defined filtering parameters are now supported:
   - `added_after` for temporal filtering
   - `match[id]` for ID-based filtering
   - `match[type]` for type-based filtering
   - `match[version]` for version control

4. **Status Resource**: The add_objects method returns a complete status resource with all required fields and optional detail fields when available.

## Changes Made

### Major Updates
1. Added `contact` and `default` fields to discovery response
2. Removed non-spec `alias` field from collections
3. Added support for match filters (id, type, version)
4. Fixed bundle handling to ensure proper STIX bundle format
5. Enhanced status response with all spec-required fields
6. Updated method signatures to support all filtering parameters

### Code Quality Improvements
1. Added comprehensive docstrings referencing spec sections
2. Improved error handling with graceful fallbacks
3. Better type hints for return values
4. Consistent filter parameter handling

## Testing

All functionality has been validated through unit tests that verify:
- Correct parameter passing
- Proper response formatting
- Error handling scenarios
- Authentication flow

## Recommendations

1. **Future Enhancements**:
   - Implement full pagination support with Range headers
   - Add support for custom TAXII headers
   - Enhance error response formatting per spec

2. **Documentation**:
   - Document supported vs unsupported features clearly
   - Provide examples of using filtering parameters
   - Include migration guide for users of previous version

## Conclusion

The TAXII 2.0 client implementation is now substantially compliant with the OASIS TAXII 2.0 specification, providing all core functionality required for TAXII operations including discovery, collections management, object retrieval, and filtering capabilities.