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Hijackable smartContract : Let your classmates find the trick
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| /* | |
| * __________________________________________________________________________________________________________________ | |
| * | | | | |
| * | ________ ___ ________ ________ ___ __ ___ ___ ___ ___ ________ ________ ___ __ | | |
| * | |\ __ \|\ \ |\ __ \|\ ____\|\ \|\ \ |\ \|\ \|\ \ |\ \|\ __ \|\ ____\|\ \|\ \ | | |
| * | \ \ \|\ /\ \ \ \ \ \|\ \ \ \___|\ \ \/ /|\ \ \\\ \ \ \ \ \ \ \ \|\ \ \ \___|\ \ \/ /|_ | | |
| * | \ \ __ \ \ \ \ \ __ \ \ \ \ \ ___ \ \ __ \ \ \ __ \ \ \ \ __ \ \ \ \ \ ___ \ | | |
| * | \ \ \|\ \ \ \____\ \ \ \ \ \ \____\ \ \\ \ \ \ \ \ \ \ \|\ \\_\ \ \ \ \ \ \ \____\ \ \\ \ \ | | |
| * | \ \_______\ \_______\ \__\ \__\ \_______\ \__\\ \__\ \__\ \__\ \__\ \________\ \__\ \__\ \_______\ \__\\ \__\ | | |
| * | \|_______|\|_______|\|__|\|__|\|_______|\|__| \|__|\|__|\|__|\|__|\|________|\|__|\|__|\|_______|\|__| \|__| | | |
| * | | | |
| * |__________________________________________________________________________________________________________________| | |
| * | |
| * | |
| * | |
| * _ _____________ _ _____ _ _ _ _ | |
| * | | | | ___ \ ___ (_) ___ | ___| | | | (_) | | | |
| * | | | | |_/ / |_/ /_ ___ _ __ _ __ ___ ( _ ) | |__ | |_| |__ _ ___ _ __ ___ | | ___ __ _ _ _ | |
| * | |/\| | ___ \ __/| |/ _ \ '__| '__/ _ \ / _ \/\ | __|| __| '_ \| |/ __| '_ \ / _ \| |/ _ \ / _` | | | | | |
| * \ /\ / |_/ / | | | __/ | | | | __/ | (_> < | |___| |_| | | | | (__| | | | (_) | | (_) | (_| | |_| | | |
| * \/ \/\____/\_| |_|\___|_| |_| \___| \___/\/ \____/ \__|_| |_|_|\___|_| |_|\___/|_|\___/ \__, |\__, | | |
| * __/ | __/ | | |
| * |___/ |___/ | |
| * | |
| */ | |
| pragma solidity ^0.5.3; | |
| contract blackHijack{ | |
| address hijack = address(this); | |
| mapping(address => uint) public players; | |
| mapping(address => uint) public cards; | |
| mapping(address => bool) public twerk; | |
| uint8 players_number = 0; | |
| bool start_game; | |
| bool dealer_draw; | |
| uint dealer; | |
| /**************************************************************************** | |
| * @dev fundTheContract is needed to put around 60 Ether in the contract. * | |
| * If the contract has no Ether, nobody can play. * | |
| **************************************************************************** | |
| * | |
| * _________ | |
| * / ======= \ | |
| * / __________\ | |
| * | ___________ | | |
| * | | - | | | |
| * | | | | | |
| * | |_________| | | |
| * \=____________/ | |
| * / """"""""""" \ | |
| * / ::::::::::::: \ | |
| * (_________________) | |
| * | |
| * | |
| */ | |
| function fundTheContract() public payable{ | |
| } | |
| /************************************************************************************* | |
| * @dev getContractStatement to know the variable statement of the contract * | |
| * ->player Here we define the struct returned : * | |
| * 0 => Number of player registered. * | |
| * 1 => Is here any game started by a registered player ? * | |
| * 2 => Does someone faceTheDealer ? * | |
| * 3 => The dealer hand, what he got with what he draw. * | |
| * 4 => Current registered player address who call this function. * | |
| * 5 => His hand. * | |
| * 6 => Does he used the doubleTwerk function ? * | |
| * 7 => His bet. * | |
| * 8 => what the smartContract hodL. * | |
| * * | |
| ************************************************************************************* | |
| */ | |
| function getContractStatement() public view returns(uint8, bool, bool, uint, address, uint, bool, uint, uint256){ | |
| require(players[msg.sender] != 0); | |
| return(players_number, start_game, dealer_draw, dealer, msg.sender, cards[msg.sender], twerk[msg.sender], players[msg.sender], hijack.balance); | |
| } | |
| /************************************************************************************* | |
| * @dev payToPlay to register a player with his bet, you can't play below 1 Ether. * | |
| * @dev Casino need to put 60 Ether in the contract if you want to sit at the table. * | |
| * ->player Bet more than 1 Ether (max 5), we love your coins. * | |
| ************************************************************************************* | |
| * | |
| * *********** | |
| * ***** *********** | |
| * ** ****** *** ******** | |
| * **** ****** ** ******* | |
| * *** ******* ** ****** | |
| * *** ** * ** | |
| * *|/------ -------\ ** * | |
| * | |=| :===** | |
| * | O | | O | }|* | |
| * |---- | ---- | |* | |
| * | |___ |\/ | |
| * | | | |
| * \ ----- | | |
| * \ | | |
| * -__ -- -/ | |
| * | |
| */ | |
| function payToPlay() public payable{ | |
| require(hijack.balance >= 60 ether); | |
| require(!start_game); | |
| require(players_number <= 6); | |
| require(msg.value >= 1 ether); | |
| require(msg.value <= 5 ether); | |
| players[msg.sender] = msg.value; | |
| cards[msg.sender] = 0; | |
| players_number++; | |
| } | |
| /**************************************** | |
| * @dev drawACard to pick a card. * | |
| * ->player Try your luck. * | |
| **************************************** | |
| * | |
| * .------. | |
| * .------. |A . | | |
| * |A_ _ | .------; / \ | | |
| * |( \/ )|-----. _ |(_,_) | | |
| * | \ / | /\ |( ) | I A| | |
| * | \/ A|/ \ |_x_) |------' | |
| * `-----+'\ / | Y A| | |
| * | \/ A|-----' | |
| * `------' | |
| * | |
| * | |
| */ | |
| function drawACard() public returns(uint){ | |
| require(players[msg.sender] != 0); | |
| require(!twerk[msg.sender]); | |
| start_game = true; | |
| cards[msg.sender] += random(); | |
| return cards[msg.sender]; | |
| } | |
| /*************************************************************************** | |
| * @dev doubleTwerk double your bet and draw only one more card. * | |
| * ->player if you use doubleTwerk you can only faceTheDealer after. * | |
| *************************************************************************** | |
| * _.._ | |
| * .' '. | |
| * (____/`\ \ | |
| * ( |' ' ) ) | |
| * ) _\= _/ ( | |
| * __..---.(`_.' ` \ ) | |
| * `;-""-._(_( . `; ( | |
| * / `-`'--' ; ) | |
| * / / . ( . ,| |( | |
| * _.-`'---...__,' /-,..___.-'--'_| |_) | |
| * '-'``'-.._ ,' | / .........' | |
| * ``;--"`; | `-` | |
| * `'..__.' | |
| * | |
| */ | |
| function doubleTwerk() public payable{ | |
| require(cards[msg.sender] != 0); | |
| require(start_game); | |
| require(msg.value == players[msg.sender]); | |
| require(!twerk[msg.sender]); | |
| players[msg.sender] += msg.value; | |
| drawACard(); | |
| twerk[msg.sender] = true; | |
| } | |
| /************************************************************************************ | |
| * @dev faceTheDealer makes the dealer draw cards depending on blackHijack rules. * | |
| * ->player If you face the dealer you can't draw any card. * | |
| ************************************************************************************ | |
| * | |
| * | |
| * _..-''--'----_. | |
| * ,''.-''| .---/ _`-._ | |
| * ,' \ \ ;| | ,/ / `-._`-. | |
| * ,' ,',\ \( | |// /,-._ / / | |
| * ;.`. `,\ \`| |/ / | )/ / | |
| * / /`_`.\_\ \| /_.-.'-''/ / | |
| * / /_|_:.`. \ |;'`..') / / | |
| * `-._`-._`.`.;`.\ ,' / / | |
| * `-._`.`/ ,'-._/ / | |
| * : `-/ \`-.._/ | |
| * | : ;._ ( | |
| * : | \ ` \ | |
| * \ \ | | |
| * : : ; | |
| * | / | |
| * ; ,' | |
| * / / | |
| * / / | |
| * / | |
| */ | |
| function faceTheDealer() public returns(uint){ | |
| require(start_game); | |
| require(cards[msg.sender] != 0); | |
| if(!dealer_draw){ | |
| dealer = 0; | |
| } | |
| dealer_draw = true; | |
| while(dealer < 17){ | |
| dealer += random(); | |
| } | |
| return dealer; | |
| } | |
| /************************************************************ | |
| * @dev random generate a random number between 1 and 10. * | |
| * ->player Trust us. * | |
| ************************************************************ | |
| * ____ ____ ____ ___ ___ ___ ___ | |
| * | \ / || \ | \ / \ | | | | |
| * | D )| o || _ || \ | || _ _ | | |
| * | / | || | || D || O || \_/ | | |
| * | \ | _ || | || || || | | | |
| * | . \| | || | || || || | | | |
| * |__|\_||__|__||__|__||_____| \___/ |___|___| | |
| * | |
| */ | |
| function random() private view returns(uint) { | |
| return uint(blockhash(block.number-1))%10 + 1; | |
| } | |
| /************************************************************ | |
| * @dev rewardTheNoob reward all the winners. * | |
| * ->player Contract always win. * | |
| ************************************************************ | |
| * | |
| * █ | |
| * ███ | |
| * ▄██████ | |
| * █████████ | |
| * ███████████▄ | |
| * ▄██████████████ | |
| * █████████████████ | |
| * ███████████████████▄ | |
| * ██████████████████████ | |
| * █████████████████████████ | |
| * ███████████████████████████▄ | |
| * ██████████████████████████████ | |
| * █████████████████████████████████ | |
| * ███████████████████████████████████ | |
| * █████████████████████████████████████ | |
| * ███████████████████████████████▀ | |
| * ▀████████████████████████ | |
| * █████████████████ | |
| * ███▄ █████████▀ ▄██▀ | |
| * ████▄ ▀██ ▄█████ | |
| * ███████ ▄▄██████ | |
| * █████████▄ ▄█████████ | |
| * ▀███████████████████ | |
| * █████████████████ | |
| * ▐█████████████ | |
| * ██████████▀ | |
| * ███████ | |
| * ████▀ | |
| * █ | |
| * | |
| * | |
| * | |
| */ | |
| function rewardTheNoob() public returns(uint8){ | |
| require(start_game); | |
| require(dealer_draw); | |
| require(cards[msg.sender] != 0); | |
| if(players_number == 1){ | |
| dealer_draw = false; | |
| start_game = false; | |
| } | |
| if(cards[msg.sender] > 21){ | |
| killPlayer(msg.sender); | |
| return 2; | |
| } | |
| if(dealer > 21){ | |
| msg.sender.transfer(players[msg.sender] * 2); | |
| killPlayer(msg.sender); | |
| return 1; | |
| } | |
| if(cards[msg.sender] > dealer){ | |
| msg.sender.transfer(players[msg.sender] * 2); | |
| killPlayer(msg.sender); | |
| return 1; | |
| }else if(cards[msg.sender] == dealer){ | |
| msg.sender.transfer(players[msg.sender]); | |
| killPlayer(msg.sender); | |
| return 0; | |
| }else{ | |
| killPlayer(msg.sender); | |
| return 2; | |
| } | |
| } | |
| /**************************************************** | |
| * @dev killPlayer delete a player from mappings. * | |
| * ->player Sorry for your loss. * | |
| **************************************************** | |
| * | |
| * _,.-------.,_ | |
| * ,;~' '~;, | |
| * ,; ;, | |
| * ; ; | |
| * ,' ', | |
| * ,; ;, | |
| * ; ; . . ; ; | |
| * | ; ______ ______ ; | | |
| * | `/~" ~" . "~ "~\' | | |
| * | ~ ,-~~~^~, | ,~^~~~-, ~ | | |
| * | | }:{ | | | |
| * | l / | \ ! | | |
| * .~ (__,.--" .^. "--.,__) ~. | |
| * | ---;' / | \ `;--- | | |
| * \__. \/^\/ .__/ | |
| * V| \ / |V | |
| * | |T~\___!___!___/~T| | | |
| * | |`IIII_I_I_I_IIII'| | | |
| * | \,III I I I III,/ | | |
| * \ `~~~~~~~~~~' / | |
| * \ . . / | |
| * \. ^ ./ | |
| * ^~~~^~~~^ | |
| * | |
| */ | |
| function killPlayer(address _player) private{ | |
| delete(cards[_player]); | |
| delete(players[_player]); | |
| delete(twerk[_player]); | |
| players_number--; | |
| } | |
| } |
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