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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 | """
ERC20 Revoke Approval Validator
Validates that ERC20 approval was successfully revoked (allowance set to zero)
"""
from typing import Dict, Any
class ERC20RevokeApprovalValidator:
"""Validator for ERC20 revoke approval transactions"""
def __init__(self, token_address: str, spender_address: str):
"""
Initialize validator
Args:
token_address: ERC20 token contract address
spender_address: Address whose approval should be revoked
"""
self.expected_token = token_address.lower()
self.expected_spender = spender_address.lower()
self.max_score = 100
def validate(
self,
tx: Dict[str, Any],
receipt: Dict[str, Any],
state_before: Dict[str, Any],
state_after: Dict[str, Any]
) -> Dict[str, Any]:
"""
Validate the transaction execution results
Args:
tx: Transaction object
receipt: Transaction receipt
state_before: Blockchain state before transaction
state_after: Blockchain state after transaction
Returns:
Validation results including score and details
"""
score = 0
details = {}
checks = []
# Check 1: Transaction success (30 points)
tx_success = receipt.get('status') == 1
if tx_success:
score += 30
checks.append({
'name': 'Transaction Success',
'passed': True,
'points': 30,
'message': 'Transaction executed successfully'
})
else:
checks.append({
'name': 'Transaction Success',
'passed': False,
'points': 0,
'message': f"Transaction failed with status: {receipt.get('status')}"
})
return {
'score': score,
'max_score': self.max_score,
'passed': False,
'checks': checks,
'details': details
}
# Check 2: Token contract address correct (20 points)
actual_to = tx.get('to', '').lower()
contract_correct = actual_to == self.expected_token
if contract_correct:
score += 20
checks.append({
'name': 'Token Contract',
'passed': True,
'points': 20,
'message': f'Correct token contract: {self.expected_token}'
})
else:
checks.append({
'name': 'Token Contract',
'passed': False,
'points': 0,
'message': f'Expected: {self.expected_token}, Got: {actual_to}'
})
details['expected_token'] = self.expected_token
details['actual_to'] = actual_to
# Check 3: Function signature (20 points)
# ERC20 approve function selector: 0x095ea7b3 (keccak256("approve(address,uint256)"))
tx_data = tx.get('data', '0x')
if tx_data and len(tx_data) >= 10:
function_selector = tx_data[:10].lower()
expected_selector = '0x095ea7b3' # approve(address,uint256)
if function_selector == expected_selector:
score += 20
checks.append({
'name': 'Function Signature',
'passed': True,
'points': 20,
'message': 'Correct ERC20 approve function signature'
})
# Decode parameters from data
try:
if len(tx_data) >= 138: # 0x(2) + selector(8) + spender(64) + amount(64) = 138
spender_hex = tx_data[10:74] # Next 64 chars (32 bytes)
amount_hex = tx_data[74:138] # Next 64 chars (32 bytes)
# Extract address (last 40 hex chars of the 64 char field)
spender_addr = '0x' + spender_hex[-40:].lower()
amount_value = int(amount_hex, 16)
details['decoded_spender'] = spender_addr
details['decoded_amount'] = amount_value
except Exception as e:
details['decode_error'] = str(e)
else:
checks.append({
'name': 'Function Signature',
'passed': False,
'points': 0,
'message': f'Expected: {expected_selector}, Got: {function_selector}'
})
else:
checks.append({
'name': 'Function Signature',
'passed': False,
'points': 0,
'message': 'No data field or too short'
})
details['function_selector'] = tx_data[:10] if tx_data else None
# Check 4: Allowance revoked (set to 0) (30 points)
allowance_before = state_before.get('allowance', 0)
allowance_after = state_after.get('allowance', 0)
# Allowance should be 0 after revoke
allowance_revoked = allowance_after == 0
if allowance_revoked:
score += 30
checks.append({
'name': 'Allowance Revoked',
'passed': True,
'points': 30,
'message': f'Allowance successfully revoked (before: {allowance_before}, after: 0)'
})
else:
checks.append({
'name': 'Allowance Revoked',
'passed': False,
'points': 0,
'message': f'Allowance not revoked (expected: 0, got: {allowance_after})'
})
details['allowance_before'] = allowance_before
details['allowance_after'] = allowance_after
details['expected_spender'] = self.expected_spender
# Final result
passed = score >= self.max_score * 0.8 # 80% threshold
return {
'score': score,
'max_score': self.max_score,
'passed': passed,
'checks': checks,
'details': details
}
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