def avoidToBeInvokedByContract():
callerHash = GetCallingScriptHash()
entryHash = GetEntryScriptHash()
if callerHash != entryHash:
Notify(["You are not allowed to invoke this method through contract"])
return False
else:
Notify(["You can implement what you need to do here!"])
return True
def cannotAvoidContractCallAttack(guessNumber):
randomNumber = getRandomNumber()
callerHash = GetCallingScriptHash()
#Developers are wrong
entryHash = GetExecutingScriptHash()
Notify(["randomNumber:", randomNumber, "guessNumber:", guessNumber])
#Never equal
VaasRequire(callerHash == entryHash)
if guessNumber == randomNumber:
Notify(["You have won the big prize!"])
return True
return False
def avoidContractCallAttack(guessNumber):
randomNumber = getRandomNumber()
callerHash = GetCallingScriptHash()
entryHash = GetEntryScriptHash()
Notify(["randomNumber:", randomNumber, "guessNumber:", guessNumber])
if callerHash != entryHash:
Notify(["You are not allowed to invoke this method through contract!"])
return False
else:
Notify(["You can implement what you need to do here!"])
if guessNumber == randomNumber:
Notify(["You have won the big prize!"])
return True
return False
def RequireNotContract():
callerHash = GetCallingScriptHash()
entryHash = GetEntryScriptHash()
Require(callerHash == entryHash)
def RequireApproved():
callerHash = GetCallingScriptHash()
entryHash = GetEntryScriptHash()
if entryHash is not callerHash:
approved = isApproved(callerHash)
Require(approved)
def onlyLINK():
assert (bytearray_reverse(GetCallingScriptHash()) == getChainLinkToken())
return True
def invokeA(operation, params):
callerHash = GetCallingScriptHash()
entryHash = GetEntryScriptHash()
Notify(["111_invokeA",callerHash, entryHash, ContractAddress])
return ContractB(operation, params)