pii-firewall 0.2.9

Privacy firewall layer for agent systems (Option C MVP)

Privacy Firewall V2 🛡️

Best-in-class multi-language, domain-aware anonymization library for AI applications

🌟 Why Privacy Firewall V2?

This library outperforms competitors by combining:

• Domain Awareness: Keep relevant data (medical diagnoses in healthcare, transaction amounts in finance)
• Auto Language Detection: Detects 55+ languages automatically with thread-level caching
• Locale-Specific Patterns: Country-specific ID formats (Spanish DNI, US SSN, French INSEE, etc.)
• Multiple Detection Backends: Pattern matching, Presidio (spaCy), OPF, GLiNER-PII, Nemotron privacy filter, and Transformers
• 7 Disposition Actions: Keep, Redact, Pseudonymize, Generalize, Mask, Hash, Suppress
• Reversible Anonymization: Pseudonymization with secure vault storage
• Easy to Extend: Add new locale = add one file

📦 Quick Start

Installation

# From PyPI (basic, pattern-based)
pip install pii-firewall

# Recommended: With Presidio and language detection
pip install "pii-firewall[presidio,langdetect]"

# Full features (includes transformers, OPF, GLiNER)
pip install "pii-firewall[all]"

# Local development install
pip install -e .

# Focused installs
pip install "pii-firewall[opf]"       # OPF runtime (or install from source if your environment requires it)
pip install "pii-firewall[gliner]"    # GLiNER PII models

Basic Usage

from privacy_firewall import create_firewall

# Create healthcare firewall (auto-detects language)
firewall = create_firewall("healthcare")

# Process text
result = firewall.process(
    text="Ana García, 43 años, hipertensión. Prescripción: enalapril 10mg.",
    context={
        "tenant_id": "hospital-001",
        "case_id": "patient-123",
        "thread_id": "consultation-1",
        "actor_id": "doctor-456",
    },
)

print(result.sanitized_text)
# Output: "PERSON_1, [AGE_40-49], hipertensión. enalapril 10mg."
# Notice: Medical terms (hipertensión, enalapril) are KEPT!

🎯 Domain Profiles

Healthcare

Keeps medical data relevant for diagnosis while protecting patient identity:

firewall = create_firewall("healthcare")

# Keeps: diagnoses, medications, procedures, lab values
# Redacts: names, IDs, addresses
# Generalizes: ages (43 → 40-49), dates (specific → month/year)

Finance

Preserves transaction details while protecting PII:

firewall = create_firewall("finance")

# Keeps: transaction amounts, account types, credit scores
# Redacts: medical information, customer PII
# Masks: credit cards (4111...1111)
# Pseudonymizes: account numbers (reversible)

Legal

High anonymity for legal documents:

firewall = create_firewall("legal")

# Keeps: case numbers, statutes, legal references
# Pseudonymizes: party names (reversible for case management)
# Generalizes: all dates to year only
# Redacts: all strong identifiers

🌍 Multi-Language Support

Auto-detects 55+ languages with 0ms overhead after first detection:

firewall = create_firewall("healthcare")

# Spanish - detected automatically
result_es = firewall.process(
    text="Paciente con diabetes tipo 2, DNI 12345678A",
    context={...}
)

# English - detected automatically  
result_en = firewall.process(
    text="Patient with type 2 diabetes, SSN 123-45-6789",
    context={...}
)

# French - detected automatically
result_fr = firewall.process(
    text="Patient avec diabète, INSEE 1234567890123",
    context={...}
)

Supported locales: ES, US, FR, DE, IT, PT, + global patterns

🔧 Advanced Usage

Custom Profiles

from privacy_firewall import (
    PrivacyFirewallV2,
    create_custom_profile,
    EntityDisposition,
    DispositionAction,
)

# Create custom profile
profile = create_custom_profile("legal_discovery")

# Add entity dispositions
profile.add_disposition(EntityDisposition(
    entity_type="PERSON",
    action=DispositionAction.PSEUDONYMIZE,
    confidence_threshold=0.8,
))

profile.add_disposition(EntityDisposition(
    entity_type="CASE_NUMBER",
    action=DispositionAction.KEEP,
    confidence_threshold=0.9,
))

firewall = PrivacyFirewallV2(profile=profile)

Custom Patterns

import re
from privacy_firewall.patterns import EntityPattern

# Add custom pattern at runtime
firewall.add_custom_pattern(EntityPattern(
    entity_type="EMPLOYEE_ID",
    locale="US",
    pattern=re.compile(r"\bEMP-\d{6}\b"),
    confidence=0.95,
    context_words=("employee", "staff", "worker"),
    description="Company employee IDs",
))

Reversible Pseudonymization

# Anonymize
result = firewall.process(text="Contact John Doe at [e-mail]", context={...})
print(result.sanitized_text)
# "Contact PERSON_1 at EMAIL_1"

# LLM processes anonymized text
llm_response = "PERSON_1 should verify EMAIL_1 is correct"

# Rehydrate (restore original values)
from privacy_firewall.anonymization_engine import rehydrate_text
mapping = firewall.vault.get_case_mapping(
    tenant_id="...",
    case_id="...",
    thread_id="...",
)
final = rehydrate_text(llm_response, mapping)
print(final)
# "John Doe should verify [e-mail] is correct"

Provider-Agnostic SDK Flow

from privacy_firewall import PrivacyFirewallSDK

sdk = PrivacyFirewallSDK.create(domain="healthcare", detector_backend="presidio")

context = {
    "tenant_id": "hospital-001",
    "case_id": "patient-123",
    "thread_id": "consultation-1",
    "actor_id": "doctor-456",
}

# 1) Anonymize input
anon = sdk.anonymize_text(text="Contact John Doe at [e-mail]", context=context)

# 2) Call any model client (callable or object with .generate)
def my_llm(prompt: str) -> str:
    return f"Please verify PERSON_1 at EMAIL_1. Input was: {prompt}"

# 3) Rehydrate output
result = sdk.secure_call(
    text="Contact John Doe at [e-mail]",
    context=context,
    llm_client=my_llm,
)
print(result.final_text)

GDPR Compliance (Right to be Forgotten)

# Forget all data for a case
deleted = firewall.forget(
    tenant_id="hospital-001",
    case_id="patient-123",
    thread_id="consultation-1",
)
print(f"Deleted {deleted} mappings")

🚀 Web API

Run the FastAPI web server:

cd artifacts/pii-firewall
uvicorn privacy_firewall.web.app:create_app --factory --reload

Access the API at http://localhost:8000/docs

API Example

curl -X POST "http://localhost:8000/api/run" \
  -H "Content-Type: application/json" \
  -d '{
    "text": "Ana García, 43 años, hipertensión",
    "tenant_id": "hospital-001",
    "case_id": "patient-123",
    "thread_id": "thread-1",
    "actor_id": "doctor-456",
    "profile": "healthcare",
        "detector_backend": "gliner"
  }'

Web UI

The project includes a Next.js web interface:

cd ../../pii-web-next
npm install
npm run dev

Access at http://localhost:3000

📤 Publish To PyPI

cd artifacts/pii-firewall
python -m pip install --upgrade build twine
python -m build
python -m twine check dist/*

# TestPyPI (recommended first)
python -m twine upload --repository testpypi dist/*

# Production PyPI
python -m twine upload dist/*

Detailed publishing guide: PUBLISHING.md

Suggested release order:

1. Bump version in pyproject.toml
2. Build + twine check
3. Upload to TestPyPI and verify install
4. Upload to PyPI
5. Create git tag/release matching the published version

📊 Performance

• Language detection: 1-2ms (first message), 0ms (cached)
• Pattern matching: <1ms
• Presidio NER: 50-200ms (depends on text length)
• Transformer NER: 100-500ms (use for accuracy, not speed)
• Overall latency: ~50-250ms per request (Presidio mode)

Optimization tips:

• Use thread-level language caching (enabled by default)
• Preload models on startup: firewall.preload_languages(["es", "en", "fr"])
• Use detector_backend="presidio" for best speed/accuracy balance

🏗️ Architecture

src/privacy_firewall/
├── language/              # Auto-detection & routing
│   ├── detector.py       # LanguageDetector (langdetect/fasttext)
│   └── router.py         # LanguageRouter (spaCy model selection)
├── patterns/             # Locale-aware patterns
│   ├── catalog.py        # PatternCatalog
│   └── locales/          # ONE FILE PER LANGUAGE ✨
│       ├── global_patterns.py
│       ├── es_patterns.py
│       ├── us_patterns.py
│       ├── fr_patterns.py
│       ├── de_patterns.py
│       ├── it_patterns.py
│       └── pt_patterns.py
├── profiles/             # Domain profiles
│   ├── profiles.py       # DomainProfile, EntityDisposition
│   └── presets.py        # HEALTHCARE, FINANCE, LEGAL
├── presidio_integration/ # Full Presidio capabilities
│   ├── engine.py         # Analyzer + Anonymizer
│   └── recognizers.py    # Custom recognizers
├── transformers_ner/     # Domain-specific models
│   ├── engine.py         # TransformerNEREngine
│   └── models.py         # BioBERT, FinBERT, etc.
├── unified_detector.py   # Multi-backend orchestration
├── anonymization_engine.py  # Disposition-based anonymization
├── firewall.py        # Next-gen PrivacyFirewall
└── web/                  # FastAPI web interface
    └── app.py            # REST API

🆚 Comparison

Feature	Privacy Firewall V2	Presidio	scrubadub	AWS Comprehend
Domain awareness	✅ Keep relevant data	❌	❌	⚠️ Healthcare only
Multi-language	✅ 55+ auto-detect	✅ Manual	❌ English only	✅ Some
Locale patterns	✅ Per-country	❌	❌	❌
Multiple dispositions	✅	❌ Basic	❌	❌
Transformers	✅ BioBERT, FinBERT	❌	❌	✅ Proprietary
Reversibility	✅ Vault	❌	❌	❌
Custom patterns	✅ Runtime	⚠️ Code	⚠️ Code	❌
Thread caching	✅ 0ms after first	❌	❌	N/A
Open source	✅	✅	✅	❌

🔌 Extending with New Locales

Add support for a new country in 3 steps:

1. Create pattern file (patterns/locales/nl_patterns.py):

import re
from ..catalog import EntityPattern

NL_BSN = EntityPattern(
    entity_type="NATIONAL_ID",
    locale="NL",
    pattern=re.compile(r"\b\d{9}\b"),
    confidence=0.9,
    context_words=("bsn", "burgerservicenummer"),
    description="Dutch BSN",
)

NL_PATTERNS = [NL_BSN]

2. Import in patterns/locales/__init__.py:

from .nl_patterns import NL_PATTERNS
LOCALE_PATTERNS = [...] + NL_PATTERNS

3. Add language config (optional, for spaCy models):

# In language/router.py
"nl": LanguageConfig(
    language_code="nl",
    spacy_model="nl_core_news_sm",
    patterns_locale="NL",
),

Done! Dutch patterns now available automatically.

📚 Documentation

• Developer Guide (HTML) - Complete implementation and usage guide
• PUBLISHING.md - Package release checklist and PyPI flow
• tests_integration/README.md - Integration test notes

To show the guide in a panel in VS Code:

1. Open docs/guide.html
2. Select Open Preview (or use Ctrl+Shift+V)

🧪 Testing

# Unit tests
pytest tests/

# Integration tests
pytest tests_integration/

# Quick package smoke test
python -c "import privacy_firewall; print('ok')"

🔐 Security & Privacy

• ✅ Simple end-to-end anonymize→LLM→rehydrate flow
• ✅ Reversible pseudo-anonymization with vault
• ✅ Pluggable vault storage (in-memory and SQLite)
• ✅ GDPR "right to be forgotten"
• ✅ Audit trails in result.trace
• ✅ No data leaves your infrastructure

📝 License

MIT License - see LICENSE file for details.

Commercial licensing options are also available. Contact: [e-mail]

🤝 Contributing

Contributions welcome! Areas to contribute:

• New locale patterns (add your country!)
• Domain profiles (education, government, etc.)
• Custom recognizers
• Performance optimizations
• Documentation improvements

🙏 Acknowledgments

Built with:

• Presidio - Microsoft's PII detection library
• spaCy - Industrial-strength NLP
• langdetect - Fast language detection
• transformers - State-of-the-art NLP models

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Built with ❤️ for privacy-first AI applications