def getRandomNumber():
callerHash = GetCallingScriptHash()
entryHash = GetEntryScriptHash()
Require(callerHash == entryHash)
randomHash = GetCurrentBlockHash()
randomNumber = abs(randomHash) % 100
return randomNumber
def invokeB(param):
Notify(["111_invokeB", param])
# to prevent hack from other contract
callerHash = GetCallingScriptHash()
entryHash = GetEntryScriptHash()
Notify([callerHash, entryHash, ContractAddress])
return True
def checkHash():
Notify(["111_checkHash"])
# to prevent hack from other contract
callerHash = GetCallingScriptHash()
entryHash = GetEntryScriptHash()
Notify([callerHash, entryHash, ContractAddress])
return True
def getRandomNumber():
callerHash = GetCallingScriptHash()
entryHash = GetEntryScriptHash()
Require(callerHash == entryHash)
randomHash = GetCurrentBlockHash()
winers = getWiners()
randomNumber = abs(randomHash) % len(winers)
return randomNumber
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 Main(op):
if op == "Hash":
Hash()
return True
if op == "Constant":
Constant()
return True
a = GetEntryScriptHash() + GetExecutingScriptHash()
Notify(a)
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 Hash():
a = GetEntryScriptHash() + GetExecutingScriptHash()
Notify(a)
return False
def invokeA(operation, params):
callerHash = GetCallingScriptHash()
entryHash = GetEntryScriptHash()
Notify(["111_invokeA",callerHash, entryHash, ContractAddress])
return ContractB(operation, params)