Ethereum Ðapp Development - Video 8 | Smart Contracts - Escrow

notes.txt

// package.json
{
  "dependencies": {
    "web3": "0.17.0-alpha",
    "solc": "^0.4.4"
  }
}

// Escrow.sol
contract Escrow {

  address public buyer;
  address public seller;
  address public arbiter;
  
  function Escrow(address _seller, address _arbiter) {
    buyer = msg.sender;
    seller = _seller;
    arbiter = _arbiter;
  }
  
  function payoutToSeller() {
    if(msg.sender == buyer || msg.sender == arbiter) {
      seller.send(this.balance);
    }
  }
  
  function refundToBuyer() {
    if(msg.sender == seller || msg.sender == arbiter) {
      buyer.send(this.balance);
    }
  }
  
  function getBalance() constant returns (uint) {
    return this.balance;
  }

}

The current version of Solidity requires you to put a payable flag at the end of a constructor. If you don't do this, you'll get Error: Cannot send value to non-payable function

Here's the corrected code:

contract Escrow {

  address public buyer;
  address public seller;
  address public arbiter;

  function Escrow (address _seller, address _arbiter) payable {
    buyer = msg.sender;
    seller = _seller;
    arbiter = _arbiter;
  }

  function payoutToSeller () {
    if (msg.sender == buyer || msg.sender == arbiter) {
      seller.send(this.balance);
    }
  }

  function refundToBuyer () {
    if (msg.sender == seller || msg.sender == arbiter) {
      buyer.send(this.balance);
    }
  }

  function getBalance() constant returns (uint) {
    return this.balance;
  }
}

Extended gist notes here: https://gist.github.com/NathanMaton/e4d812a318a9383ee918b35efc7f6083