import hashlib
import json
from typing import Any, Dict, Optional
def generate_content_hash(content: str, metadata: Optional[Dict[str, Any]] = None) -> str:
"""
Generate a unique hash for content and metadata.
This improved version ensures consistent hashing by:
1. Normalizing content (strip whitespace, lowercase)
2. Sorting metadata keys
3. Using a consistent JSON serialization
"""
# Normalize content
normalized_content = content.strip().lower()
# Create hash content with normalized content
hash_content = normalized_content
# Add metadata if present
if metadata:
# Filter out timestamp and dynamic fields
static_metadata = {
k: v for k, v in metadata.items()
if k not in ['timestamp', 'content_hash', 'embedding']
}
if static_metadata:
# Sort keys and use consistent JSON serialization
hash_content += json.dumps(static_metadata, sort_keys=True, ensure_ascii=True)
# Generate hash
return hashlib.sha256(hash_content.encode('utf-8')).hexdigest()