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| from typing import Dict, Optional, ClassVar | |
| import weave | |
| from pydantic import BaseModel | |
| from ...regex_model import RegexModel | |
| from ..base import Guardrail | |
| class RegexPIIGuardrailResponse(BaseModel): | |
| contains_pii: bool | |
| detected_pii_types: Dict[str, list[str]] | |
| safe_to_process: bool | |
| explanation: str | |
| anonymized_text: Optional[str] = None | |
| class RegexPIIGuardrail(Guardrail): | |
| regex_model: RegexModel | |
| patterns: Dict[str, str] = {} | |
| should_anonymize: bool = False | |
| DEFAULT_PII_PATTERNS: ClassVar[Dict[str, str]] = { | |
| "email": r"[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}", | |
| "phone_number": r"\b(?:\+?1[-.]?)?\(?(?:[0-9]{3})\)?[-.]?(?:[0-9]{3})[-.]?(?:[0-9]{4})\b", | |
| "ssn": r"\b\d{3}[-]?\d{2}[-]?\d{4}\b", | |
| "credit_card": r"\b\d{4}[-.]?\d{4}[-.]?\d{4}[-.]?\d{4}\b", | |
| "ip_address": r"\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b", | |
| "date_of_birth": r"\b\d{2}[-/]\d{2}[-/]\d{4}\b", | |
| "passport": r"\b[A-Z]{1,2}[0-9]{6,9}\b", | |
| "drivers_license": r"\b[A-Z]\d{7}\b", | |
| "bank_account": r"\b\d{8,17}\b", | |
| "zip_code": r"\b\d{5}(?:[-]\d{4})?\b" | |
| } | |
| def __init__(self, use_defaults: bool = True, should_anonymize: bool = False, **kwargs): | |
| patterns = {} | |
| if use_defaults: | |
| patterns = self.DEFAULT_PII_PATTERNS.copy() | |
| if kwargs.get("patterns"): | |
| patterns.update(kwargs["patterns"]) | |
| # Create the RegexModel instance | |
| regex_model = RegexModel(patterns=patterns) | |
| # Initialize the base class with both the regex_model and patterns | |
| super().__init__( | |
| regex_model=regex_model, | |
| patterns=patterns, | |
| should_anonymize=should_anonymize | |
| ) | |
| def guard(self, prompt: str, **kwargs) -> RegexPIIGuardrailResponse: | |
| """ | |
| Check if the input prompt contains any PII based on the regex patterns. | |
| Args: | |
| prompt: Input text to check for PII | |
| Returns: | |
| RegexPIIGuardrailResponse containing PII detection results and recommendations | |
| """ | |
| result = self.regex_model.check(prompt) | |
| # Create detailed explanation | |
| explanation_parts = [] | |
| if result.matched_patterns: | |
| explanation_parts.append("Found the following PII in the text:") | |
| for pii_type, matches in result.matched_patterns.items(): | |
| explanation_parts.append(f"- {pii_type}: {len(matches)} instance(s)") | |
| else: | |
| explanation_parts.append("No PII detected in the text.") | |
| if result.failed_patterns: | |
| explanation_parts.append("\nChecked but did not find these PII types:") | |
| for pattern in result.failed_patterns: | |
| explanation_parts.append(f"- {pattern}") | |
| # Add anonymization logic | |
| anonymized_text = None | |
| if getattr(self, 'should_anonymize', False) and result.matched_patterns: | |
| anonymized_text = prompt | |
| for pii_type, matches in result.matched_patterns.items(): | |
| for match in matches: | |
| replacement = f"[{pii_type.upper()}]" | |
| anonymized_text = anonymized_text.replace(match, replacement) | |
| return RegexPIIGuardrailResponse( | |
| contains_pii=not result.passed, | |
| detected_pii_types=result.matched_patterns, | |
| safe_to_process=result.passed, | |
| explanation="\n".join(explanation_parts), | |
| anonymized_text=anonymized_text | |
| ) |