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from typing import Dict, List, Any, Tuple
def validate_schema_fill(obj: Dict[str, Any], schema_keys: List[str]) -> Tuple[bool, str]:
"""
Strictly validate a mined JSON object against a target schema.
"""
# 1. Key set check
if set(obj.keys()) != set(schema_keys):
missing = set(schema_keys) - set(obj.keys())
extra = set(obj.keys()) - set(schema_keys)
return False, f"Schema mismatch. Missing: {missing}, Extra: {extra}"
# 2. Value type and length check
for k in schema_keys:
v = obj[k]
if v is not None and not isinstance(v, str):
return False, f"Type error at '{k}': expected string or null, got {type(v).__name__}"
if isinstance(v, str):
# Safety: reject excessively long strings (potential hallucination or prose injection)
if len(v) > 800:
return False, f"Value too long at '{k}' (>800 chars)"
# Safety: reject code blocks or markdown artifacts if found
if "```" in v:
return False, f"Markdown artifact found at '{k}'"
return True, "ok"
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