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execution-grounded-evaluation
blockchain
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edbc049 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 | """Validator for erc20_decrease_allowance operation"""
from typing import Dict, Any
class ERC20DecreaseAllowanceValidator:
"""Validator for erc20_decrease_allowance operation"""
def __init__(self, token_address: str, spender_address: str,
subtracted_value: float, agent_address: str, token_decimals: int = 18):
self.token_address = token_address.lower()
self.spender_address = spender_address.lower()
self.subtracted_value = subtracted_value
self.agent_address = agent_address.lower()
self.token_decimals = token_decimals
self.subtracted_value_wei = int(self.subtracted_value * 10**self.token_decimals)
def validate(self, tx: Dict[str, Any], receipt: Dict[str, Any],
state_before: Dict[str, Any], state_after: Dict[str, Any]) -> Dict[str, Any]:
checks = []
total_score = 0
max_score = 100
# 1. Transaction Success (30 points)
tx_success = receipt.get('status') == 1
tx_success_score = 30 if tx_success else 0
total_score += tx_success_score
checks.append({
'name': 'Transaction Success',
'passed': tx_success,
'score': tx_success_score,
'max_score': 30,
'message': 'Transaction executed successfully' if tx_success else 'Transaction failed (possibly due to underflow: subtractedValue > current allowance)'
})
if not tx_success:
# If transaction failed, skip other checks
return {
'passed': False,
'score': total_score,
'max_score': max_score,
'checks': checks,
'details': {
'transaction_failed': True,
'possible_reason': 'Underflow protection: subtractedValue may exceed current allowance'
}
}
# 2. Correct Function Called (20 points)
tx_data = tx.get('data', '') if isinstance(tx, dict) else tx.data if hasattr(tx, 'data') else ''
correct_function = False
# decreaseAllowance selector: 0xa457c2d7
if isinstance(tx_data, str) and tx_data.startswith('0xa457c2d7'):
correct_function = True
elif hasattr(tx_data, 'hex') and tx_data.hex().startswith('a457c2d7'):
correct_function = True
function_score = 20 if correct_function else 0
total_score += function_score
checks.append({
'name': 'Correct Function Called',
'passed': correct_function,
'score': function_score,
'max_score': 20,
'message': 'Called decreaseAllowance(address,uint256)' if correct_function else f'Wrong function called. Expected decreaseAllowance (0xa457c2d7), got {tx_data[:10] if tx_data else "none"}'
})
# Decode actual parameters from transaction data
actual_subtracted_value_wei = self.subtracted_value_wei # Default to generated parameter
actual_spender = None
params_match = True
param_mismatch_details = []
if correct_function and len(tx_data) >= 138:
try:
# decreaseAllowance(address spender, uint256 subtractedValue)
# Data layout: 0x + 8 (selector) + 64 (spender) + 64 (subtractedValue)
spender_hex = tx_data[10:74] # Skip '0xa457c2d7', take next 64 chars
actual_spender = '0x' + spender_hex[-40:] # Last 40 chars = 20 bytes = address
subtracted_value_hex = tx_data[74:138] # Next 64 chars
actual_subtracted_value_wei = int(subtracted_value_hex, 16)
print(f"🔍 Decoded transaction parameters:")
print(f" Spender: {actual_spender}")
print(f" Subtracted Value: {actual_subtracted_value_wei / 10**self.token_decimals:.2f}")
# Compare with generated parameters
if actual_spender.lower() != self.spender_address.lower():
params_match = False
param_mismatch_details.append(f"spender mismatch: expected {self.spender_address}, got {actual_spender}")
# No tolerance for amount (exact match required)
if abs(actual_subtracted_value_wei - self.subtracted_value_wei) > 0:
params_match = False
param_mismatch_details.append(f"subtracted_value mismatch: expected {self.subtracted_value:.2f}, got {actual_subtracted_value_wei / 10**self.token_decimals:.2f}")
if not params_match:
print(f"⚠️ Parameter mismatches detected:")
for detail in param_mismatch_details:
print(f" - {detail}")
else:
print(f"✅ All parameters match generated values")
except Exception as e:
print(f"⚠️ Failed to decode parameters from tx data: {e}, using generated parameters")
# Get state changes
allowance_before = state_before.get('allowance', 0)
allowance_after = state_after.get('allowance', 0)
allowance_decrease = allowance_before - allowance_after
# Use actual subtracted_value for validation
expected_subtracted_value = actual_subtracted_value_wei / 10**self.token_decimals
# 3. Allowance Decreased Correctly (40 points)
# decreaseAllowance() SUBTRACTS from the current allowance
# So we check if allowance decreased by the specified subtractedValue (exact match)
allowance_valid = allowance_decrease == actual_subtracted_value_wei
allowance_score = 40 if allowance_valid else 0
total_score += allowance_score
allowance_message = f'Allowance decreased by {allowance_decrease / 10**self.token_decimals:.2f} (expected: {expected_subtracted_value:.2f}). Before: {allowance_before / 10**self.token_decimals:.2f}, After: {allowance_after / 10**self.token_decimals:.2f}' if allowance_valid else f'Allowance decrease mismatch. Expected decrease: {expected_subtracted_value:.2f}, actual decrease: {allowance_decrease / 10**self.token_decimals:.2f}'
if not params_match and param_mismatch_details:
allowance_message += f' [Note: Parameter mismatches: {", ".join(param_mismatch_details)}]'
checks.append({
'name': 'Allowance Decreased Correctly',
'passed': allowance_valid,
'score': allowance_score,
'max_score': 40,
'message': allowance_message
})
# 4. No Token Transfer (10 points)
# Token balance should not change for decreaseAllowance
balance_before = state_before.get('token_balance', 0)
balance_after = state_after.get('token_balance', 0)
no_transfer = balance_before == balance_after
no_transfer_score = 10 if no_transfer else 0
total_score += no_transfer_score
checks.append({
'name': 'No Token Transfer',
'passed': no_transfer,
'score': no_transfer_score,
'max_score': 10,
'message': 'Token balance unchanged (decreaseAllowance does not transfer)' if no_transfer else f'Token balance changed unexpectedly. Before: {balance_before / 10**self.token_decimals:.4f}, After: {balance_after / 10**self.token_decimals:.4f}'
})
all_passed = all(check['passed'] for check in checks)
return {
'passed': all_passed,
'score': total_score,
'max_score': max_score,
'checks': checks,
'details': {
'subtracted_value': expected_subtracted_value,
'allowance_before': allowance_before / 10**self.token_decimals,
'allowance_after': allowance_after / 10**self.token_decimals,
'allowance_decrease': allowance_decrease / 10**self.token_decimals,
'token_balance_unchanged': no_transfer,
'function_called': tx_data[:10] if tx_data else 'none',
'parameters_match': params_match,
'parameter_mismatches': param_mismatch_details if param_mismatch_details else None,
'actual_spender': actual_spender,
'expected_spender': self.spender_address
}
}
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